diff --git a/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.i18n.yaml b/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.i18n.yaml
index d28fb0da87..14a271f3c7 100644
--- a/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.i18n.yaml
+++ b/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-07-20-canonical-tool-output-contract.md: 8cd7df98758d6d4ac240fea21e7bbe0c89f26d1b
-2026-07-20-canonical-tool-output-contract.zh.md: 0920e0c2c331a247ecd9a039a05c19c9dd2871bc
+2026-07-20-canonical-tool-output-contract.md: 6b5cd089fcf206e659c7b67b8a996bfe81d0c333
+2026-07-20-canonical-tool-output-contract.zh.md: 61b25b14ca6f048b73a51788f112165745ae7106
diff --git a/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.md b/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.md
index 8cd7df9875..6b5cd089fc 100644
--- a/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.md
+++ b/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.md
@@ -34,7 +34,7 @@ type ToolExecutionResult =
 
 `tools/post-execute` has two mutually exclusive successful projections. Replacing `content` changes only Native/model presentation and preserves the canonical value and metadata. Replacing `value` revalidates the replacement and recomputes both presentation projections. A block removes the value and becomes a failure. Content replacement is therefore not a confidentiality mechanism: policy that must prevent programmatic access blocks the call or replaces the value.
 
-Canonical values are execution-local. The agent loop persists `tool/result` with only `content`, `error`, and optional `meta`; Code Mode's `tool/code-dispatch` persists only its bounded summary. Neither event stores the intermediate value, so replay reproduces presentation but cannot reconstruct the programmatic result. When a tool declares `presentationMeta`, it is computed only for a direct surface call; a nested Code dispatch gets no metadata or result card. The outer `run_code` card instead reads final post-policy content and declares no presentation metadata. Generic and tool-owned spill projections similarly skip nested dispatches, whose canonical value never enters model context.
+Canonical values are execution-local. The agent loop persists `tool/result` with only `content`, `error`, and optional `meta`; Code Mode's `tool/code-dispatch` persists the sub-call's rendered `content` and `isError`. Neither event stores the canonical intermediate value, so replay reproduces presentation but cannot reconstruct the programmatic result. When a tool declares `presentationMeta`, it is computed only for a direct surface call; a nested Code dispatch gets no metadata or result card. The outer `run_code` card instead reads final post-policy content and declares no presentation metadata. Generic and tool-owned spill projections similarly skip nested dispatches, whose canonical value never enters model context.
 
 The first-party tools preserve their existing Native text while returning domain DTOs:
 
diff --git a/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.zh.md b/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.zh.md
index 0920e0c2c3..61b25b14ca 100644
--- a/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.zh.md
+++ b/.agents/notes/implemented/architecture/2026-07-20-canonical-tool-output-contract.zh.md
@@ -34,7 +34,7 @@ type ToolExecutionResult =
 
 `tools/post-execute` 为成功结果提供两种互斥的投影方式。替换 `content` 只改变 Native／模型展示，并保留规范值和元数据。替换 `value` 会重新校验替代值，并重新计算两份展示投影。阻止操作会移除值并转为失败。因此，替换内容并不是保密机制：必须阻止程序化访问的策略，应当阻止调用或替换值。
 
-规范值仅存在于执行期间。agent loop（智能体循环）持久化的 `tool/result` 只包含 `content`、`error` 和可选的 `meta`；Code Mode 的 `tool/code-dispatch` 只持久化其有界摘要。两个事件都不存储中间值，因此回放可以重现展示，却无法重建程序化结果。当工具声明 `presentationMeta` 时，系统只会为直接的外层调用计算它；嵌套 Code 分发没有元数据或结果卡片。外层 `run_code` 卡片则读取最终的 post-policy 内容，并且不声明展示元数据。通用以及工具自有的输出落盘投影同样跳过嵌套分发，因为它们的规范值永远不会进入模型上下文。
+规范值仅存在于执行期间。agent loop（智能体循环）持久化的 `tool/result` 只包含 `content`、`error` 和可选的 `meta`；Code Mode 的 `tool/code-dispatch` 持久化子调用渲染后的 `content` 与 `isError`。两个事件都不存储规范中间值，因此回放可以重现展示，却无法重建程序化结果。当工具声明 `presentationMeta` 时，系统只会为直接的外层调用计算它；嵌套 Code 分发没有元数据或结果卡片。外层 `run_code` 卡片则读取最终的 post-policy 内容，并且不声明展示元数据。通用以及工具自有的输出落盘投影同样跳过嵌套分发，因为它们的规范值永远不会进入模型上下文。
 
 第一方工具在保持现有 Native 文本不变的同时返回领域 DTO：
 
diff --git a/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.i18n.yaml b/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.i18n.yaml
index bf8f19a570..cdbc45a2fd 100644
--- a/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.i18n.yaml
+++ b/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-07-20-code-mode-result-card-completeness.md: 97cd9d722e8252b956e16da03c3b8418451350f3
-2026-07-20-code-mode-result-card-completeness.zh.md: fea162b073e3473f7a07d4bf054408d28851fea9
+2026-07-20-code-mode-result-card-completeness.md: 05ff0ed41c94bef7eb41204d8dd81bbda3c06016
+2026-07-20-code-mode-result-card-completeness.zh.md: a93be4cc42fca87ce4ef11b6ad3a6cbe64bef66f
diff --git a/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.md b/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.md
index 97cd9d722e..05ff0ed41c 100644
--- a/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.md
+++ b/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.md
@@ -16,7 +16,7 @@ The canonical tool registry pipeline owns the final model-facing outer content.
 
 `run_code` omits `presentResult`. The established generic result fallback keeps the pending program title and renders the raw final `tool/result.content`; that durable, replayable, post-policy projection is the card's only result-content source. The host API proxy therefore omits a separate result view instead of serializing the same content in both `event.data.content` and `view.view.content`. The redundant logs-only `presentationMeta` projection remains removed.
 
-Nested dispatch remains unchanged. Calls marked by `exec.parent` emit bounded `tool/code-dispatch` diagnostics but no `tool/call` or `tool/result` surface cards, so one outer `run_code` invocation still produces exactly one card.
+Nested dispatch remains unchanged. Calls marked by `exec.parent` emit `tool/code-dispatch` events (full rendered content) but no `tool/call` or `tool/result` surface cards, so one outer `run_code` invocation still produces exactly one card.
 
 ## Testing
 
diff --git a/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.zh.md b/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.zh.md
index fea162b073..a93be4cc42 100644
--- a/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.zh.md
+++ b/.agents/notes/implemented/bug-fix/2026-07-20-code-mode-result-card-completeness.zh.md
@@ -16,7 +16,7 @@ Status: implemented
 
 `run_code` 不提供 `presentResult`。既有的通用结果回退机制会保留待完成的程序标题，并渲染原始的最终 `tool/result.content`；这一持久、可回放且经过 post-policy 处理的投影是卡片中结果内容的唯一来源。宿主 API 代理因此不提供单独的结果视图，而不会在 `event.data.content` 与 `view.view.content` 中重复序列化同一内容。冗余的仅含日志的 `presentationMeta` 投影继续保持移除状态。
 
-嵌套分发保持不变。带有 `exec.parent` 标记的调用会发出有界的 `tool/code-dispatch` 诊断，但不会生成与 `tool/call` 或 `tool/result` 对应的界面卡片，因此一次外层 `run_code` 调用仍然只会生成一张卡片。
+嵌套分发保持不变。带有 `exec.parent` 标记的调用会发出 `tool/code-dispatch` 事件（携带完整渲染内容），但不会生成与 `tool/call` 或 `tool/result` 对应的界面卡片，因此一次外层 `run_code` 调用仍然只会生成一张卡片。
 
 ## 测试
 
diff --git a/.agents/notes/implemented/feature/2026-06-15-code-mode.i18n.yaml b/.agents/notes/implemented/feature/2026-06-15-code-mode.i18n.yaml
index 7ee0bfc88c..e04e95c817 100644
--- a/.agents/notes/implemented/feature/2026-06-15-code-mode.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-06-15-code-mode.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-06-15-code-mode.md: 8e964eeb36e430b58312427e45cf8e4a99582457
-2026-06-15-code-mode.zh.md: 3de1adfcf287b69ca8307244bde35f286ce4b99d
+2026-06-15-code-mode.md: 33b8dc6a27c1cc12962f75e1211996dba6f81496
+2026-06-15-code-mode.zh.md: db03ca10edbc7fa826ed991df26847aa9271b731
diff --git a/.agents/notes/implemented/feature/2026-06-15-code-mode.md b/.agents/notes/implemented/feature/2026-06-15-code-mode.md
index 8e964eeb36..33b8dc6a27 100644
--- a/.agents/notes/implemented/feature/2026-06-15-code-mode.md
+++ b/.agents/notes/implemented/feature/2026-06-15-code-mode.md
@@ -42,7 +42,7 @@ This note owns Code Mode's presentation, composition, isolation, and settlement
 
 Under `'code'` and `'both'` the registry owns `run_code` as a reserved presentation transport with one required parameter, `{ code: string }`. It is represented by a normal `ToolDefinition` for dispatch but stays outside the filterable capability layers, so restrictions cannot accidentally remove Code Mode's only entry point. Calls traverse the complete tool pipeline — `tools/pre-execute` → monotonic guards → `tools/execute` around dispatch → `tools/post-execute` → optional definition-owned `finalizeContent` → immutable `tools/result` notification — exactly like native calls; a permission plugin can inspect the program text before it runs, and final-result observers see the normalized outer outcome. Its `execute(args, exec)`:
 
-1. **Build bindings.** One run-scoped signal follows outer cancellation and is aborted whenever the run settles. Each visible tool binding snapshots lossless-JSON arguments, waits on the serialization queue, executes with a deterministic call id and the outer token as `parent`, defers returned contexts through the outer execution, and logs `tool/code-dispatch`. Success returns the tool's final canonical JSON value; failure becomes the program-visible `ToolCallError`. Every sub-call retains its own immutable execution identity and traverses the full tool pipeline.
+1. **Build bindings.** One run-scoped signal follows outer cancellation and is aborted whenever the run settles. Each visible tool binding snapshots lossless-JSON arguments, waits on the serialization queue, executes with a deterministic call id and the outer token as `parent`, defers returned contexts through the outer execution, and logs `tool/code-dispatch` with the full rendered result content. Success returns the tool's final canonical JSON value; failure becomes the program-visible `ToolCallError`. Every sub-call retains its own immutable execution identity and traverses the full tool pipeline.
 2. **Runs the program**: `ctx.codeRuntime.run({ program: args.code, bindings: [{ global: 'tools', functions }], signal: runController.signal })`. The runtime receives the run-scoped signal, not only the caller's outer signal, so any way the outer run settles also aborts work inside the runtime.
 3. **Settle after quiescence.** When the runtime settles, the bridge aborts outstanding work and drains the dispatch queue before returning. Success returns captured logs and the completion value as canonical output; the registry renders that value into durable `tool/result.content`, which the result card reads directly. A runtime failure becomes `CodeRunFailedError`; backend rejection uses the registry's normal error boundary. Both produce structured error results, and no sub-call can append after `run_code` settles.
 
@@ -54,7 +54,7 @@ Under `'code'` and `'both'` the registry owns `run_code` as a reserved presentat
 
 ### Observability: `tool/code-dispatch`
 
-Each sub-dispatch appends a log-only `tool/code-dispatch` event containing parent and child call ids, tool identity, normalized arguments, and result summary. It remains outside model history but available to persistence and UIs. Appends occur inside the open `run_code` turn. Direct executions without an agent still run but cannot log the event.
+Each sub-dispatch appends a log-only `tool/code-dispatch` event containing parent and child call ids, tool identity, normalized arguments, and the complete rendered `content`/`isError` outcome. It remains outside model history but available to persistence and UIs. Appends occur inside the open `run_code` turn. Direct executions without an agent still run but cannot log the event.
 
 ### The code-runtime seam
 
diff --git a/.agents/notes/implemented/feature/2026-06-15-code-mode.zh.md b/.agents/notes/implemented/feature/2026-06-15-code-mode.zh.md
index 3de1adfcf2..db03ca10ed 100644
--- a/.agents/notes/implemented/feature/2026-06-15-code-mode.zh.md
+++ b/.agents/notes/implemented/feature/2026-06-15-code-mode.zh.md
@@ -42,7 +42,7 @@ Cloudflare 的 [Code Mode](https://blog.cloudflare.com/code-mode/) 提出了一
 
 在 `'code'` 和 `'both'` 下，注册表拥有 `run_code` 作为保留的呈现传输通道，带一个必需参数 `{ code: string }`。它由一个正常的 `ToolDefinition` 表示以供分发，但位于可过滤的能力层之外，因此限制规则不会意外移除 Code Mode 的唯一入口。调用遍历完整的工具流水线——`tools/pre-execute` → 单调守卫 → `tools/execute` 包裹分发 → `tools/post-execute` → 由定义拥有的可选 `finalizeContent` → 不可变的 `tools/result` 通知——与原生调用完全一致；权限插件可以在程序运行前检查程序文本，最终结果观察者看到的是规范化的外层结果。其 `execute(args, exec)`：
 
-1. **构建绑定。** 一个 run 级别的 signal 跟随外层取消，并在 run 结算时被 abort。每个可见工具绑定都会对无损 JSON 参数创建快照，等待序列化队列，以确定性的 call id 和外层 token 作为 `parent` 执行，通过外层 execution 延后返回的上下文，并记录 `tool/code-dispatch`。成功时返回工具最终的规范 JSON 值；失败则变为程序可见的 `ToolCallError`。每个子调用保留自己不可变的执行标识，并遍历完整的工具流水线。
+1. **构建绑定。** 一个 run 级别的 signal 跟随外层取消，并在 run 结算时被 abort。每个可见工具绑定都会对无损 JSON 参数创建快照，等待序列化队列，以确定性的 call id 和外层 token 作为 `parent` 执行，通过外层 execution 延后返回的上下文，并连同完整渲染后的结果内容记录 `tool/code-dispatch`。成功时返回工具最终的规范 JSON 值；失败则变为程序可见的 `ToolCallError`。每个子调用保留自己不可变的执行标识，并遍历完整的工具流水线。
 2. **运行程序**：`ctx.codeRuntime.run({ program: args.code, bindings: [{ global: 'tools', functions }], signal: runController.signal })`。运行时接收的是 run 级别的 signal 而非仅调用方的外层 signal，因此外层 run 以任何方式结算都会同时 abort 运行时内部的工作。
 3. **完全停稳后结算。** 运行时结算后，桥 abort 未完成的工作并排空分发队列后再返回。成功时返回捕获的日志和完成值，将其作为规范输出；注册表再把该值渲染为持久化的 `tool/result.content`，供结果卡片直接读取。运行时失败变为 `CodeRunFailedError`；后端拒绝使用注册表的正常错误边界。两者都产生结构化的错误结果，且 `run_code` 结算后不允许子调用追加。
 
@@ -54,7 +54,7 @@ Cloudflare 的 [Code Mode](https://blog.cloudflare.com/code-mode/) 提出了一
 
 ### 可观测性：`tool/code-dispatch`
 
-每次子分发追加一个仅日志的 `tool/code-dispatch` 事件，包含父子 call id、工具标识、规范化参数和结果摘要。它不进入模型历史，但可供持久化和 UI 使用。追加发生在开放的 `run_code` 轮次内。没有 agent 的直接执行仍然运行，但无法记录该事件。
+每次子分发追加一个仅日志的 `tool/code-dispatch` 事件，包含父子 call id、工具标识、规范化参数以及完整渲染后的 `content`/`isError` 结果。它不进入模型历史，但可供持久化和 UI 使用。追加发生在开放的 `run_code` 轮次内。没有 agent 的直接执行仍然运行，但无法记录该事件。
 
 ### code-runtime seam
 
diff --git a/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.i18n.yaml b/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.i18n.yaml
index 190a2b773f..6f3f732cc1 100644
--- a/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-2026-07-20-code-mode-typed-tool-returns.md: 1b5cbb9f4664c371a03cfefd079d5dc531711b51
-2026-07-20-code-mode-typed-tool-returns.zh.md: 70fd9ee72803c5cd2fa228a1d38ddf7ae47a4814
+2026-07-20-code-mode-typed-tool-returns.md: 3d8642d66baf521f22dfb1ea0ef3e64683f918d4
+2026-07-20-code-mode-typed-tool-returns.zh.md: fea1be3e236c0ccba729e449ab9714ed497d900a
diff --git a/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md b/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md
index 1b5cbb9f46..3d8642d66b 100644
--- a/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md
+++ b/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md
@@ -73,7 +73,7 @@ Dynamic Cordis mounting follows the same rule: `cordis_mount` returns `{ id, plu
 
 ### Persistence, metadata, and spill
 
-Nested dispatch keeps the existing bounded `tool/code-dispatch.resultSummary` for diagnostics but does not persist canonical values. `tool/result` continues to persist only rendered content, error, and optional metadata. This is deliberately not a session-format change, so `SESSION_FORMAT_VERSION` remains unchanged and replay cannot recreate intermediate program values.
+Nested dispatch logs the sub-call's full rendered `content`/`isError` on `tool/code-dispatch` but does not persist canonical values. `tool/result` continues to persist only rendered content, error, and optional metadata. `SESSION_FORMAT_VERSION` remains unchanged (pre-release shape churn does not bump it) and replay cannot recreate intermediate canonical program values.
 
 The opaque `exec.parent` token marks nested calls. Presentation metadata and generic or tool-owned spill projections skip those calls because they have no direct result card and their canonical values never enter context. The outer `run_code` call alone produces one card and may spill its final post-policy presentation; `run_code` intentionally declares neither a result presenter nor presentation metadata, so UI adapters complete the card through their generic raw-content fallback using durable `tool/result.content`.
 
diff --git a/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.zh.md b/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.zh.md
index 70fd9ee728..fea1be3e23 100644
--- a/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.zh.md
+++ b/.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.zh.md
@@ -73,7 +73,7 @@ Code Mode 通过运行时请求中的 `{ name: "ToolCallError", memberNameProper
 
 ### 持久化、元数据与输出落盘
 
-嵌套分发会为诊断保留既有的有界 `tool/code-dispatch.resultSummary`，但不会持久化规范值。`tool/result` 继续只持久化渲染后的内容、错误和可选元数据。这并非会话格式变更，因此 `SESSION_FORMAT_VERSION` 保持不变，回放也无法重建程序的中间值。
+嵌套分发在 `tool/code-dispatch` 上记录子调用完整渲染后的 `content`/`isError`，但不会持久化规范值。`tool/result` 继续只持久化渲染后的内容、错误和可选元数据。`SESSION_FORMAT_VERSION` 保持不变（预发布阶段的形状变动不递增版本号），回放也无法重建程序的规范中间值。
 
 不透明的 `exec.parent` token 用于标识嵌套调用。由于这些调用没有直接对应的结果卡片，而且其规范值永远不会进入上下文，展示元数据以及通用或工具自有的输出落盘投影都会跳过它们。只有外层 `run_code` 调用会生成一张卡片，并且可能将 post-policy 处理后的最终展示写入落盘文件；`run_code` 有意既不声明结果展示器，也不声明展示元数据，因此 UI 适配器会通过通用的原始内容回退机制，使用持久化的 `tool/result.content` 补全该卡片。
 
diff --git a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-ui-foundation.md b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-ui-foundation.md
new file mode 100644
index 0000000000..a1629c7730
--- /dev/null
+++ b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-ui-foundation.md
@@ -0,0 +1,31 @@
+# Agent Note: Code Mode UI foundation — run_code description and native-parity dispatch logging
+
+Status: implemented
+
+English | [中文](2026-07-26-code-dispatch-ui-foundation.zh.md)
+
+> Scope: the host-side contract changes that let a UI render a Code Mode turn with the same fidelity as native tool calls — the first PR of the Code Mode web-UI stack. The [Code Mode foundation](2026-06-15-code-mode.md) owns the transport design; this note owns the model-visible `description` parameter, the full-content `tool/code-dispatch` payload, and the temporary `DSH_TOOLS_MODE` enablement seam for the `dsh` config tree.
+
+## Problem
+
+A `run_code` turn was opaque in every product surface. The call card's title was the raw program text — unreadable at row width, and unlike `bash` (whose required `description` labels the card while the command rides the expanded input) there was no model-authored label at all. The `tool/code-dispatch` event carried only a 200-char, cwd-normalized `resultSummary` of each sub-call, so no UI could ever show what a sub-call actually returned: the planned web conversation view renders sub-calls through the exact components that render native `tool/result` cards, and a bounded summary cannot feed a native-parity card. And the `dsh web` composition had no way to enable Code Mode at all — the `tools` row pinned the schema default and the runtime was absent from the tree.
+
+## Decision
+
+Three changes, one per obstacle:
+
+1. **`run_code` gains a required `description` parameter** (bash's exact contract: active voice, 5-10 words, shown in the UI; whitespace-only rejected at execute). `presentCall` now titles the card with the description and moves the program to `rawInput`. The prompt-side cost is a few tokens per call; the return is that every surface — TUI card, ACP title, web row — gets a human-readable label without parsing TypeScript.
+2. **`tool/code-dispatch` logs the sub-call's complete model-facing outcome** — `content: ContentBlock[]` + `isError`, the `tool/result` vocabulary — replacing `resultSummary` and deleting the summarize/cwd-normalization machinery outright. A UI renders a sub-call through the identical code path as a native result, including error text and non-text blocks. The event stays log-only (`deriveMessages()` ignores it): nothing about model context changes.
+3. **`DSH_TOOLS_MODE` env var on the `dsh` config tree** (`native`|`code`|`both`; unset keeps the schema default): the `tools` row reads it via `!!js`, and the worker code runtime is mounted unconditionally (Loader metadata is static, so no conditional row exists; a native boot only registers the service — workers spawn per run). This is an explicitly temporary seam: per-session tool-mode selection owned by the web UI is the design goal, and the env var dies when that lands.
+
+## Alternatives considered
+
+**Keep a bounded summary (raised cap, or a cap + `truncated` flag).** Rejected: the stack's settled requirement is that sub-call rows and details render *identically* to native calls; any cap forces a second, degraded render path plus truncation UI. The cost accepted instead: a program that reads a large file logs the rendered content verbatim on the dispatch event — uncapped, outside spill policy, growing the session log by the same bytes. Spill integration for the logged copy is deferred to a later PR of this stack (the projection exists; wiring it into the bridge is mechanical once the event shape settles with the start/end pair).
+
+**A `--tools-mode` CLI flag or profile key.** Deferred, not rejected: the flag grammar suggests permanence, and the profile json is user config — both would harden a seam the per-session design intends to remove. An env var reads as the workaround it is.
+
+**Log the canonical `value` instead of rendered `content`.** Rejected: `tool/result` persists content, not values (the [canonical output contract](../architecture/2026-07-20-canonical-tool-output-contract.md)), and native parity means matching that exactly; values remain execution-local everywhere.
+
+## Consequences
+
+Session format keeps `SESSION_FORMAT_VERSION` 0 (pre-release churn does not bump; old logs with `resultSummary` simply carry an extra unread field and lack `content` — v0 makes no compatibility promise). Existing code-mode snapshot fixtures were re-recorded. Model-visible surface grew: the `run_code` schema (one required parameter) and every code-mode system prompt/tool-schema snapshot changed. The web UI stack (subsequent PRs) builds directly on the new event payload; live per-sub-call running state needs a dispatch start/end pair that will reshape this event again.
diff --git a/apps/cli/cordis.yml b/apps/cli/cordis.yml
index b89df77c46..bd0c45f9f8 100644
--- a/apps/cli/cordis.yml
+++ b/apps/cli/cordis.yml
@@ -44,6 +44,18 @@
 
 - id: tools
   name: '@deepseek-ai/dsh-tools'
+  config:
+    # TEMPORARY workaround: DSH_TOOLS_MODE (native|code|both) opts a whole dsh
+    # process into Code Mode while per-session tool-mode selection is being
+    # designed; unset keeps the schema default (native). Remove the env seam
+    # once the web UI owns the choice per session.
+    mode: !!js process.env.DSH_TOOLS_MODE
+
+# Code Mode substrate for the row above. Mounted unconditionally because
+# Loader metadata is static (no conditional rows): a native-mode boot only
+# registers the service — a worker thread spawns per run_code execution.
+- id: code-runtime
+  name: '@deepseek-ai/dsh-code-runtime-worker'
 
 - id: user-interaction
   name: '@deepseek-ai/dsh-user-interaction'
diff --git a/apps/cli/package.json b/apps/cli/package.json
index 8799669e8d..647a464c3c 100644
--- a/apps/cli/package.json
+++ b/apps/cli/package.json
@@ -33,6 +33,7 @@
     "@deepseek-ai/dsh-client-ui-theme": "workspace:^",
     "@deepseek-ai/dsh-client-ui-trajectory": "workspace:^",
     "@deepseek-ai/dsh-client-ui-workspace": "workspace:^",
+    "@deepseek-ai/dsh-code-runtime-worker": "workspace:^",
     "@deepseek-ai/dsh-compact-basic": "workspace:^",
     "@deepseek-ai/dsh-frontend": "workspace:^",
     "@deepseek-ai/dsh-fs-local": "workspace:^",
diff --git a/apps/web/tests/smoke-real.e2e.ts b/apps/web/tests/smoke-real.e2e.ts
index a3d511df16..8c5ed4b8c2 100644
--- a/apps/web/tests/smoke-real.e2e.ts
+++ b/apps/web/tests/smoke-real.e2e.ts
@@ -271,6 +271,83 @@ describe('dsh web keyless CLI smoke', () => {
       rmSync(workspace, { recursive: true, force: true })
     }
   })
+
+  it('DSH_TOOLS_MODE=code collapses the provider wire tools to run_code with the SDK prompt section', async () => {
+    requireDist()
+    const workspace = mkdtempSync(join(tmpdir(), 'dsh-web-code-mode-'))
+
+    interface CodeModeProviderRequest {
+      messages?: { role?: string; content?: string }[]
+      tools?: { function?: { name?: string } }[]
+    }
+    let resolveProviderRequest!: (request: CodeModeProviderRequest) => void
+    const providerRequest = new Promise<CodeModeProviderRequest>((resolve) => {
+      resolveProviderRequest = resolve
+    })
+    const provider = createServer((request, response) => {
+      let body = ''
+      request.setEncoding('utf8')
+      request.on('data', (chunk: string) => { body += chunk })
+      request.on('end', () => {
+        resolveProviderRequest(JSON.parse(body) as CodeModeProviderRequest)
+        response.writeHead(200, { 'content-type': 'text/event-stream' })
+        response.end([
+          'data: {"choices":[{"delta":{"role":"assistant","content":null,"reasoning_content":""}}]}',
+          'data: {"choices":[{"delta":{"content":"done"}}]}',
+          'data: {"choices":[{"delta":{"content":""},"finish_reason":"stop"}],"usage":{"prompt_tokens":3,"completion_tokens":1}}',
+          'data: [DONE]',
+          '',
+        ].join('\n\n'))
+      })
+    })
+    await new Promise<void>(resolve => provider.listen(0, '127.0.0.1', resolve))
+    const address = provider.address()
+    if (address === null || typeof address === 'string') throw new Error('mock provider did not bind a TCP port')
+    const tsxLoader = pathToFileURL(createRequire(join(REPO_ROOT, 'package.json')).resolve('tsx')).href
+    const child = spawn(
+      process.execPath,
+      ['--import', tsxLoader, join(REPO_ROOT, 'apps/cli/src/bin.ts'), 'web', '--port', '0'],
+      {
+        cwd: workspace,
+        env: {
+          ...process.env,
+          DEEPSEEK_API_KEY: 'keyless-web-code-mode',
+          DEEPSEEK_BASE_URL: `http://127.0.0.1:${address.port}`,
+          DSH_TOOLS_MODE: 'code',
+          DSH_HOME: join(workspace, '.dsh'),
+          TSX_TSCONFIG_PATH: join(REPO_ROOT, 'tsconfig.json'),
+        },
+        stdio: ['ignore', 'pipe', 'pipe'],
+      },
+    )
+    try {
+      const baseUrl = await waitForReadyLine(child)
+      const created = await rpc<{ sessionId: string }>(baseUrl, 'session.create', {})
+      await rpc<{ accepted: true }>(baseUrl, 'session.prompt', {
+        sessionId: created.sessionId,
+        mode: 'queue',
+        content: [{ type: 'text', text: 'go' }],
+      })
+      const captured = await Promise.race([
+        providerRequest,
+        new Promise<never>((_resolve, reject) => {
+          setTimeout(() => { reject(new Error('provider request not received in 10s')) }, 10_000).unref()
+        }),
+      ])
+      expect(captured.tools?.map(tool => tool.function?.name)).toEqual(['run_code'])
+      const system = captured.messages?.find(message => message.role === 'system')
+      expect(system?.content).toContain('## Writing code for run_code')
+      expect(system?.content).toContain('declare const tools')
+    } finally {
+      const closed = child.exitCode === null
+        ? new Promise<void>((resolveClose) => { child.once('close', () => { resolveClose() }) })
+        : Promise.resolve()
+      if (child.exitCode === null) child.kill('SIGTERM')
+      await closed
+      await new Promise<void>(resolveClose => provider.close(() => { resolveClose() }))
+      rmSync(workspace, { recursive: true, force: true })
+    }
+  })
 })
 
 describe.skipIf(!process.env.DEEPSEEK_API_KEY || notReady.length > 0)('web smoke (real host, real key, W5)', () => {
diff --git a/docs/core-data-structures/tools.i18n.yaml b/docs/core-data-structures/tools.i18n.yaml
index 56581614ec..c96584f032 100644
--- a/docs/core-data-structures/tools.i18n.yaml
+++ b/docs/core-data-structures/tools.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write
-tools.md: 4a8081154a12a0d30e90f8b4df059ddc4257bba0
-tools.zh.md: 74f543548a54e532d1a858dee33bed906e82f4b3
+tools.md: 875bea18ff0c34ca97f9c144f4320d3b3a6aaa4a
+tools.zh.md: 11f0b8d4a0f29304e6fdbde7c81be981bd940a2d
diff --git a/docs/core-data-structures/tools.md b/docs/core-data-structures/tools.md
index 4a8081154a..875bea18ff 100644
--- a/docs/core-data-structures/tools.md
+++ b/docs/core-data-structures/tools.md
@@ -313,7 +313,7 @@ interface ToolExecutionFailure {
 type ToolExecutionResult = ToolExecutionSuccess | ToolExecutionFailure
 ```
 
-The result carries only the outcome. Call identity remains on the immutable `ToolExecution` that accompanies it through every hook and on the durable `tool/call` / `tool/result` session events, so wrappers cannot create a second, disagreeing identity. The canonical `value` is execution-local: the loop persists only `content`, `error`, and `meta`, while `tool/code-dispatch` stores a bounded summary. Replay reproduces presentation but cannot reconstruct intermediate values.
+The result carries only the outcome. Call identity remains on the immutable `ToolExecution` that accompanies it through every hook and on the durable `tool/call` / `tool/result` session events, so wrappers cannot create a second, disagreeing identity. The canonical `value` is execution-local: the loop persists only `content`, `error`, and `meta`, while `tool/code-dispatch` stores the sub-call's rendered `content` and `isError` verbatim. Replay reproduces presentation but cannot reconstruct canonical intermediate values.
 
 On success the registry snapshots and validates the body value, freezes it, and invokes the pure renderer plus the optional direct-surface metadata projector. It separately materializes the durable presentation fields immediately before `tools/result`; an invalid value, renderer/projector failure, or non-JSON presentation becomes a JSON-safe `isError`. The final live observer therefore sees the exact execution-local value beside fields safe for the later durable append.
 
diff --git a/docs/core-data-structures/tools.zh.md b/docs/core-data-structures/tools.zh.md
index 74f543548a..11f0b8d4a0 100644
--- a/docs/core-data-structures/tools.zh.md
+++ b/docs/core-data-structures/tools.zh.md
@@ -313,7 +313,7 @@ interface ToolExecutionFailure {
 type ToolExecutionResult = ToolExecutionSuccess | ToolExecutionFailure
 ```
 
-结果仅承载产出。调用身份保留在不可变的 `ToolExecution` 上，后者伴随结果经过每个钩子，并出现在持久化的 `tool/call` / `tool/result` 会话事件上，因此包装层无法创建第二个相互矛盾的身份。规范的 `value` 仅存在于执行期间：循环只持久化 `content`、`error` 和 `meta`，`tool/code-dispatch` 则存储有界摘要。回放可以重现展示，却无法重建中间值。
+结果仅承载产出。调用身份保留在不可变的 `ToolExecution` 上，后者伴随结果经过每个钩子，并出现在持久化的 `tool/call` / `tool/result` 会话事件上，因此包装层无法创建第二个相互矛盾的身份。规范的 `value` 仅存在于执行期间：循环只持久化 `content`、`error` 和 `meta`，`tool/code-dispatch` 则原样存储子调用渲染后的 `content` 与 `isError`。回放可以重现展示，却无法重建规范的中间值。
 
 成功时，注册表会快照并校验函数体返回值，将其冻结，然后调用纯渲染器；对于直接的外层调用，还会调用可选的元数据投影器。注册表会在 `tools/result` 之前另行物化持久展示字段；无效值、渲染器/投影器失败或非 JSON 展示都会转为 JSON 安全的 `isError`。因此，最终实时观察者能看到精确的执行期值，以及可安全用于后续持久追加的字段。
 
diff --git a/docs/persistence-catalog.md b/docs/persistence-catalog.md
index 0ac134aa41..073182cc11 100644
--- a/docs/persistence-catalog.md
+++ b/docs/persistence-catalog.md
@@ -459,22 +459,21 @@ Source: [`packages/core/session/src/types.ts:283`](../packages/core/session/src/
  * `run_code` call id, the deterministic sub-call id
  * (`<parent>:code:<n>`), the tool `name` with its JSON-normalized
  * `arguments` — the exact value dispatched, normalized BEFORE dispatch,
- * so this append can never fail on payload shape — whether the sub-call
- * errored, and a bounded `resultSummary` of its model-facing text. Before
- * bounding, occurrences of a non-root session workspace path are
- * normalized to `.` so host-specific absolute path lengths cannot change
- * the summary.
+ * so this append can never fail on payload shape — and the sub-call's
+ * complete model-facing outcome in `tool/result`'s own vocabulary
+ * (`content` + `isError`), so UIs render a sub-call through the exact
+ * code path that renders a native call.
  * Log-only: `deriveMessages()` ignores it, so sub-calls never re-enter
  * model context; persistence and UIs get every call. Appended inside the
  * parent `run_code`'s execution (the bridge drains its queue before
  * returning), so the turn-enclosure invariant holds by construction.
  */
-'tool/code-dispatch': { parentCallId: CallId; subCallId: CallId; name: string; arguments: unknown; isError: boolean; resultSummary: string }
+'tool/code-dispatch': { parentCallId: CallId; subCallId: CallId; name: string; arguments: unknown; isError: boolean; content: ContentBlock[] }
 ```
 
-Types: [CallId](core-data-structures/core.md)
+Types: [CallId](core-data-structures/core.md) · [ContentBlock](core-data-structures/core.md)
 
-Source: [`packages/core/tools/src/code-mode.ts:34`](../packages/core/tools/src/code-mode.ts)
+Source: [`packages/core/tools/src/code-mode.ts:32`](../packages/core/tools/src/code-mode.ts)
 
 #### `tool/result` — surface
 
diff --git a/docs/tool-catalog.md b/docs/tool-catalog.md
index 3cdc822a7a..deb4cd822c 100644
--- a/docs/tool-catalog.md
+++ b/docs/tool-catalog.md
@@ -119,10 +119,15 @@ Execute a TypeScript program against the available tools. Write the BODY of an a
     "code": {
       "type": "string",
       "description": "The program: the body of an async TypeScript function."
+    },
+    "description": {
+      "type": "string",
+      "description": "Clear, concise description of what this program does in active voice, 5-10 words (shown in the UI). Examples: \"Count TODO markers across packages\"; \"Read failing test and its fixture\"; \"Rename config key in every cordis.yml\"."
     }
   },
   "required": [
-    "code"
+    "code",
+    "description"
   ]
 }
 ```
diff --git a/examples/acp-agent/tests/snapshots/code-mode-turn/session.jsonl b/examples/acp-agent/tests/snapshots/code-mode-turn/session.jsonl
index a7f4620a51..174b5b9015 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-turn/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/code-mode-turn/session.jsonl
@@ -1,685 +1,289 @@
-{"type":"session","version":0,"id":"bfa65aa9-f8f8-4b91-af4b-9653cee8fc19","createdAt":1784629671301,"cwd":"/var/folders/2c/psb0_fmx7hbgz558xjt_f0l00000gn/T/acp-snap-cwd-QAp4c9","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":1784629671304,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1784629671305,"data":{"content":[{"type":"text","text":"Using ONE run_code program: call the bash tool twice — exactly `echo CODE_ONE` then exactly `echo CODE_TWO`. Inside that same program, console.log exactly `captured output`, then return the two outputs joined with a plus sign. Reply with that joined string only and stop."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1784629671305,"data":{"title":"Using ONE run_code program: call","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"step/start","seq":3,"time":1784629671311,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":4,"time":1784629671312,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"assistant/chunk","seq":5,"time":1784629671745,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
-{"type":"assistant/chunk","seq":6,"time":1784629671746,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"Let"}}}
-{"type":"assistant/chunk","seq":7,"time":1784629671954,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
-{"type":"assistant/chunk","seq":8,"time":1784629671983,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" carefully"}}}
-{"type":"assistant/chunk","seq":9,"time":1784629672017,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" read"}}}
-{"type":"assistant/chunk","seq":10,"time":1784629672017,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" the"}}}
-{"type":"assistant/chunk","seq":11,"time":1784629672039,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" instructions"}}}
-{"type":"assistant/chunk","seq":12,"time":1784629672040,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
-{"type":"assistant/chunk","seq":13,"time":1784629672040,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" I"}}}
-{"type":"assistant/chunk","seq":14,"time":1784629672040,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" need"}}}
-{"type":"assistant/chunk","seq":15,"time":1784629672040,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
-{"type":"assistant/chunk","seq":16,"time":1784629672040,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" write"}}}
-{"type":"assistant/chunk","seq":17,"time":1784629672068,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" ONE"}}}
-{"type":"assistant/chunk","seq":18,"time":1784629672068,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" run"}}}
-{"type":"assistant/chunk","seq":19,"time":1784629672068,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"_code"}}}
-{"type":"assistant/chunk","seq":20,"time":1784629672068,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" program"}}}
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-{"type":"assistant/chunk","seq":22,"time":1784629672096,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":":\n\n"}}}
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-{"type":"assistant/chunk","seq":24,"time":1784629672096,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
-{"type":"assistant/chunk","seq":25,"time":1784629672096,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" Calls"}}}
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-{"type":"assistant/chunk","seq":32,"time":1784629672153,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"ONE"}}}
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-{"type":"assistant/chunk","seq":43,"time":1784629672295,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"\"\n"}}}
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-{"type":"assistant/chunk","seq":600,"time":1784629677261,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"Let me carefully read the instructions. I need to write ONE run_code program that:\n\n1. Calls bash with `echo CODE_ONE` - just the command \"echo CODE_ONE\"\n2. Calls bash with `echo CODE_TWO` - just the command \"echo CODE_TWO\"\n3. Inside that same program, console.log exactly `captured output`\n4. Return the two outputs joined with a plus sign\n\nLet me look at the bash tool signature carefully. The `command` parameter is the bash command to execute. So I'd pass `echo CODE_ONE` as the command.\n\nBut wait - I need to be careful about what the output looks like. The bash tool returns stdout/stderr objects. Let me check the output type:\n\n```ts\nbash: {\n    kind: \"foreground\" | \"background\";\n    // if foreground:\n    exitCode: number | null;\n    stdout: { text: string; truncated: boolean; spillPath?: string; };\n    stderr: { text: string; ... };\n    ...\n}\n```\n\nSo I need to extract `stdout.text` from each call.\n\nLet me also make sure about the `description` parameter - it's required and should be \"5-10 words\" describing the command.\n\nLet me write the code:\n\n```ts\nconst r1 = await tools.bash({ command: \"echo CODE_ONE\", description: \"Echo CODE_ONE to stdout\" });\nconst r2 = await tools.bash({ command: \"echo CODE_TWO\", description: \"Echo CODE_TWO to stdout\" });\nconsole.log(\"captured output\");\nreturn r1.stdout.text.trim() + \"+\" + r2.stdout.text.trim();\n```\n\nLet me think about the output format. `echo CODE_ONE` will output `CODE_ONE\\n`. So `r1.stdout.text` would be `\"CODE_ONE\\n\"` and after trim it's `\"CODE_ONE\"`.\n\nSo the joined string would be `CODE_ONE+CODE_TWO`.\n\nAnd console.log(\"captured output\") prints \"captured output\" to the console.\n\nThe response comes back as the tool result which includes stdout and the return value. Since the return value is what we want, and `reply with that joined string only and stop` - I think the return value of the run_code function is what matters. But console.log output also comes back.\n\nLet me just write it and see."}}}}
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-{"type":"assistant/message","seq":604,"time":1784629677264,"data":{"turn":1,"step":1,"content":[{"type":"reasoning","text":"Let me carefully read the instructions. I need to write ONE run_code program that:\n\n1. Calls bash with `echo CODE_ONE` - just the command \"echo CODE_ONE\"\n2. Calls bash with `echo CODE_TWO` - just the command \"echo CODE_TWO\"\n3. Inside that same program, console.log exactly `captured output`\n4. Return the two outputs joined with a plus sign\n\nLet me look at the bash tool signature carefully. The `command` parameter is the bash command to execute. So I'd pass `echo CODE_ONE` as the command.\n\nBut wait - I need to be careful about what the output looks like. The bash tool returns stdout/stderr objects. 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diff --git a/examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md b/examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md
index 3817b0bc8a..1914c33d69 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md
+++ b/examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md
@@ -1,6 +1,6 @@
 You are an AI agent powered by the DeepSeek Harness SDK.
 
-You are a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.
+You are a coding assistant powered by the deepseek-v4-pro model. Your working directory is {{cwd}}.
 
 Verify your work by running the code or tests. Keep answers brief and factual.
 
diff --git a/examples/acp-agent/tests/snapshots/code-mode-turn/tool-schemas.expected.json b/examples/acp-agent/tests/snapshots/code-mode-turn/tool-schemas.expected.json
index c2289b4e19..a9ee29aa7a 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-turn/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/code-mode-turn/tool-schemas.expected.json
@@ -9,10 +9,15 @@
           "code": {
             "type": "string",
             "description": "The program: the body of an async TypeScript function."
+          },
+          "description": {
+            "type": "string",
+            "description": "Clear, concise description of what this program does in active voice, 5-10 words (shown in the UI). Examples: \"Count TODO markers across packages\"; \"Read failing test and its fixture\"; \"Rename config key in every cordis.yml\"."
           }
         },
         "required": [
-          "code"
+          "code",
+          "description"
         ]
       }
     }
diff --git a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/session.jsonl b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/session.jsonl
index 3f664e8e09..0dcbb76bbf 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/session.jsonl
@@ -1,190 +1,240 @@
-{"type":"session","version":0,"id":"65fbb8a6-624c-4d6a-bf5d-a7a7d14f2b49","createdAt":1783921765266,"cwd":"/var/folders/_g/59jgff8x2gqd39f5vy1wnbfc0000gn/T/acp-snap-cwd-uorU26","delegationDepth":0}
-{"type":"turn/start","seq":0,"time":1783921765269,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1783921765269,"data":{"content":[{"type":"text","text":"Using ONE run_code program, call tools.read on nested/task.txt. After the program finishes, answer the workspace handshake question using the newly discovered instructions: What is the Code Mode workspace handshake?"}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"session/title","seq":2,"time":1783921765269,"data":{"title":"Using ONE run_code program, call","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"step/start","seq":3,"time":1783921765275,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":4,"time":1783921765275,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}","messagePrefix":[{"role":"user","content":[{"type":"text","text":"<system-reminder>\nThe following workspace instructions may be relevant to your work. Use them as guidance when applicable. More specific instructions take precedence over broader ones. They do not override system, developer, or direct user instructions.\n\nInstructions from: AGENTS.md\n\nWorkspace snapshot root instruction.\n\n</system-reminder>"}]}]},"reason":"initial"}}
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diff --git a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/stdout.expected.jsonl b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/stdout.expected.jsonl
index f9a0416af5..219133d708 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/stdout.expected.jsonl
+++ b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/stdout.expected.jsonl
@@ -1,4 +1,4 @@
 {"jsonrpc":"2.0","id":1,"result":{"protocolVersion":1,"agentInfo":{"name":"deepseek-harness-acp","version":"0.0.1"},"agentCapabilities":{"promptCapabilities":{"image":false,"audio":false,"embeddedContext":false}},"authMethods":[]}}
 {"jsonrpc":"2.0","id":2,"result":{"sessionId":"{{sessionId}}"}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"The **Code Mode workspace handshake** is: `CODE_MODE_CONTEXT_OK`"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"CODE_MODE_CONTEXT_OK"}}}}
 {"jsonrpc":"2.0","id":3,"result":{"stopReason":"end_turn"}}
diff --git a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/system-prompt.expected.md b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/system-prompt.expected.md
index 3817b0bc8a..1914c33d69 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/system-prompt.expected.md
+++ b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/system-prompt.expected.md
@@ -1,6 +1,6 @@
 You are an AI agent powered by the DeepSeek Harness SDK.
 
-You are a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.
+You are a coding assistant powered by the deepseek-v4-pro model. Your working directory is {{cwd}}.
 
 Verify your work by running the code or tests. Keep answers brief and factual.
 
diff --git a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/tool-schemas.expected.json b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/tool-schemas.expected.json
index c2289b4e19..a9ee29aa7a 100644
--- a/examples/acp-agent/tests/snapshots/code-mode-workspace-context/tool-schemas.expected.json
+++ b/examples/acp-agent/tests/snapshots/code-mode-workspace-context/tool-schemas.expected.json
@@ -9,10 +9,15 @@
           "code": {
             "type": "string",
             "description": "The program: the body of an async TypeScript function."
+          },
+          "description": {
+            "type": "string",
+            "description": "Clear, concise description of what this program does in active voice, 5-10 words (shown in the UI). Examples: \"Count TODO markers across packages\"; \"Read failing test and its fixture\"; \"Rename config key in every cordis.yml\"."
           }
         },
         "required": [
-          "code"
+          "code",
+          "description"
         ]
       }
     }
diff --git a/examples/headless-agent/tests/code-mode.e2e.ts b/examples/headless-agent/tests/code-mode.e2e.ts
index 86c1559b83..3ea6925c96 100644
--- a/examples/headless-agent/tests/code-mode.e2e.ts
+++ b/examples/headless-agent/tests/code-mode.e2e.ts
@@ -85,7 +85,7 @@ function runCode(harness: Context, code: string, signal: AbortSignal = testToolS
   return harness.tools.execute({
     callId: CallId(`keyless-code-${++keylessCall}`),
     name: RUN_CODE_NAME,
-    arguments: { code },
+    arguments: { code, description: 'Run the e2e program' },
     signal,
   })
 }
diff --git a/examples/tui-agent/tests/snapshots/code-mode/session.jsonl b/examples/tui-agent/tests/snapshots/code-mode/session.jsonl
index 84a4879050..2aa4300a2e 100644
--- a/examples/tui-agent/tests/snapshots/code-mode/session.jsonl
+++ b/examples/tui-agent/tests/snapshots/code-mode/session.jsonl
@@ -1,219 +1,450 @@
-{"type":"session","version":0,"id":"main-session","createdAt":1784629683717,"cwd":"/tmp/dsh-tui-snapshot-code-mode-8ohx1D"}
-{"type":"turn/start","seq":0,"time":1784629683765,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1784629683765,"data":{"content":[{"type":"text","text":"Using ONE run_code program: call the bash tool twice — exactly `echo CODE_ONE` then exactly `echo CODE_TWO`. Inside that same program, console.log exactly `captured output`, then return the two outputs joined with a plus sign. Reply with that joined string only and stop."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":1784629683777,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":3,"time":1784629683778,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
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+{"type":"assistant/chunk","seq":421,"time":1785004242105,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" should"}}}
+{"type":"assistant/chunk","seq":422,"time":1785004242133,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
+{"type":"assistant/chunk","seq":423,"time":1785004242134,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
+{"type":"assistant/chunk","seq":424,"time":1785004242134,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" just"}}}
+{"type":"assistant/chunk","seq":425,"time":1785004242162,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" `"}}}
+{"type":"assistant/chunk","seq":426,"time":1785004242163,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"CODE"}}}
+{"type":"assistant/chunk","seq":427,"time":1785004242164,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"_"}}}
+{"type":"assistant/chunk","seq":428,"time":1785004242164,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":429,"time":1785004242164,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"+"}}}
+{"type":"assistant/chunk","seq":430,"time":1785004242164,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"CODE"}}}
+{"type":"assistant/chunk","seq":431,"time":1785004242192,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"_T"}}}
+{"type":"assistant/chunk","seq":432,"time":1785004242193,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"WO"}}}
+{"type":"assistant/chunk","seq":433,"time":1785004242193,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"`."}}}
+{"type":"assistant/chunk","seq":434,"time":1785004242193,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":435,"time":1785004242193,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"CODE"}}}
+{"type":"assistant/chunk","seq":436,"time":1785004242193,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"_"}}}
+{"type":"assistant/chunk","seq":437,"time":1785004242222,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"ONE"}}}
+{"type":"assistant/chunk","seq":438,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"+"}}}
+{"type":"assistant/chunk","seq":439,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"CODE"}}}
+{"type":"assistant/chunk","seq":440,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"_T"}}}
+{"type":"assistant/chunk","seq":441,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"WO"}}}
+{"type":"assistant/chunk","seq":442,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The output shows:\n1. `console.log(\"captured output\")` printed `captured output`\n2. The return value `CODE_ONE+CODE_TWO` was also printed\n\nThe user said \"Reply with that joined string only and stop.\" So I should reply with just `CODE_ONE+CODE_TWO`."}}}}
+{"type":"assistant/chunk","seq":443,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"CODE_ONE+CODE_TWO"}}}}
+{"type":"assistant/chunk","seq":444,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":89,"outputTokens":75,"cacheReadTokens":4352,"reasoningTokens":67}}}}
+{"type":"assistant/chunk","seq":445,"time":1785004242223,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":446,"time":1785004242224,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The output shows:\n1. `console.log(\"captured output\")` printed `captured output`\n2. The return value `CODE_ONE+CODE_TWO` was also printed\n\nThe user said \"Reply with that joined string only and stop.\" So I should reply with just `CODE_ONE+CODE_TWO`."},{"type":"text","text":"CODE_ONE+CODE_TWO"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":89,"outputTokens":75,"cacheReadTokens":4352,"reasoningTokens":67}},"sourceEventSeqs":[366,367,368,369,370,371,372,373,374,375,376,377,378,379,380,381,382,383,384,385,386,387,388,389,390,391,392,393,394,395,396,397,398,399,400,401,402,403,404,405,406,407,408,409,410,411,412,413,414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,437,438,439,440,441,442,443,444,445],"surfaceOp":"append"}
+{"type":"step/end","seq":447,"time":1785004242225,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":448,"time":1785004242225,"data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/examples/tui-agent/tests/snapshots/code-mode/terminal.expected.txt b/examples/tui-agent/tests/snapshots/code-mode/terminal.expected.txt
index af14b32791..333c4ef1c6 100644
--- a/examples/tui-agent/tests/snapshots/code-mode/terminal.expected.txt
+++ b/examples/tui-agent/tests/snapshots/code-mode/terminal.expected.txt
@@ -1,7 +1,7 @@
-terminal 100x36 buffer=normal length=38 base=2 viewport=2
+terminal 100x36 buffer=normal length=53 base=17 viewport=17
 lifecycle started=1 stopped=0 progress=inactive
 title "Using ONE run_code program: call — DSH TUI snapshot"
-cursor hidden column=1 viewportRow=31 bufferRow=33
+cursor hidden column=1 viewportRow=31 bufferRow=48
 buffer
 0| " DEEPSEEK HARNESS"
   style 1-8 fg=bright-blue bold
@@ -32,58 +32,107 @@ buffer
 11| " Reasoning                                                                                          "
   style 1-9 fg=bright-black italic
 12| " The user wants me to write a single run_code program that:                                         "
-  style 1-58 fg=bright-black italic
+  style 1-36 fg=bright-black italic
+  style 37-44 fg=cyan
+  style 45-58 fg=bright-black italic
 13| " 1. Calls bash tool twice - first with echo CODE_ONE, then with echo CODE_TWO                       "
   style 1-3 fg=bright-blue
-  style 4-38 fg=bright-black italic
+  style 4-9 fg=bright-black italic
+  style 10-13 fg=cyan
+  style 14-38 fg=bright-black italic
   style 39-51 fg=cyan
   style 52-63 fg=bright-black italic
   style 64-76 fg=cyan
 14| " 2. console.log exactly captured output                                                             "
   style 1-3 fg=bright-blue
-  style 4-23 fg=bright-black italic
+  style 4-14 fg=cyan
+  style 15-23 fg=bright-black italic
   style 24-38 fg=cyan
-15| " 3. Return the two outputs joined with a plus sign                                                  "
+15| " 3. Returns the two outputs joined with a plus sign                                                 "
   style 1-3 fg=bright-blue
-  style 4-49 fg=bright-black italic
+  style 4-50 fg=bright-black italic
 16| "                                                                                                    "
-17| " Let me write this carefully.                                                                       "
-  style 1-28 fg=bright-black italic
-18| <blank>
-19| "▌ "
+17| " The program body is an async function. I need to:                                                  "
+  style 1-49 fg=bright-black italic
+18| " - Call tools.bash({command: \"echo CODE_ONE\", description: \"Echo CODE_ONE\"})                        "
+  style 1-2 fg=bright-blue
+  style 3-7 fg=bright-black italic
+  style 8-75 fg=cyan
+19| " - Call tools.bash({command: \"echo CODE_TWO\", description: \"Echo CODE_TWO\"})                        "
+  style 1-2 fg=bright-blue
+  style 3-7 fg=bright-black italic
+  style 8-75 fg=cyan
+20| " - Extract the stdout text from each                                                                "
+  style 1-2 fg=bright-blue
+  style 3-35 fg=bright-black italic
+21| " - console.log exactly captured output                                                              "
+  style 1-2 fg=bright-blue
+  style 3-22 fg=bright-black italic
+  style 23-37 fg=cyan
+22| " - Return them joined with +                                                                        "
+  style 1-2 fg=bright-blue
+  style 3-26 fg=bright-black italic
+  style 27-27 fg=cyan
+23| "                                                                                                    "
+24| " Let me look at the bash output shape. From the schema, it returns {kind: \"foreground\", stdout:     "
+  style 1-66 fg=bright-black italic
+  style 67-99 fg=cyan
+25| " {text: string, ...}, ...}. So I'd access result.stdout.text.                                       "
+  style 1-25 fg=cyan
+  style 26-41 fg=bright-black italic
+  style 42-59 fg=cyan
+  style 60-60 fg=bright-black italic
+26| "                                                                                                    "
+27| " The echo commands produce output like \"CODE_ONE\\n\" - I should trim the trailing newline.           "
+  style 1-88 fg=bright-black italic
+28| "                                                                                                    "
+29| " Let me write the code.                                                                             "
+  style 1-22 fg=bright-black italic
+30| <blank>
+31| "▌ "
   style 0-0 fg=green
-20| "▌ ✓ const result1 = await tools.bash({ command: \"echo CODE_ONE\", description: \"First echo\" });      "
+32| "▌ ✓ Echo CODE_ONE and CODE_TWO, join with plus                                                      "
   style 0-0 fg=green
   style 2-2 fg=green bold
-  style 3-99 bold
-21| "▌ cons                                                                                              "
+  style 3-45 bold
+33| "▌ captured output                                                                                   "
   style 0-0 fg=green
-  style 2-5 bold
-22| "▌ captured output                                                                                   "
+34| "▌ CODE_ONE+CODE_TWO                                                                                 "
   style 0-0 fg=green
-23| "▌ CODE_ONE+CODE_TWO                                                                                 "
+35| "▌ "
   style 0-0 fg=green
-24| "▌ "
-  style 0-0 fg=green
-25| <blank>
-26| " Reasoning                                                                                          "
+36| <blank>
+37| " Reasoning                                                                                          "
   style 1-9 fg=bright-black italic
-27| " The user asked me to reply with that joined string only and stop. The joined string is             "
+38| " The output shows:                                                                                  "
+  style 1-17 fg=bright-black italic
+39| " 1. console.log(\"captured output\") printed captured output                                          "
+  style 1-3 fg=bright-blue
+  style 4-33 fg=cyan
+  style 34-42 fg=bright-black italic
+  style 43-57 fg=cyan
+40| " 2. The return value CODE_ONE+CODE_TWO was also printed                                             "
+  style 1-3 fg=bright-blue
+  style 4-20 fg=bright-black italic
+  style 21-37 fg=cyan
+  style 38-54 fg=bright-black italic
+41| "                                                                                                    "
+42| " The user said \"Reply with that joined string only and stop.\" So I should reply with just           "
   style 1-99 fg=bright-black italic
-28| " CODE_ONE+CODE_TWO.                                                                                 "
+43| " CODE_ONE+CODE_TWO.                                                                                 "
   style 1-17 fg=cyan
   style 18-18 fg=bright-black italic
-29| <blank>
-30| " Assistant                                                                                          "
+44| <blank>
+45| " Assistant                                                                                          "
   style 1-9 fg=bright-magenta bold
-31| " CODE_ONE+CODE_TWO                                                                                  "
-32| "────────────────────────────────────────────────────────────────────────────────────────────────────"
+46| " CODE_ONE+CODE_TWO                                                                                  "
+47| "────────────────────────────────────────────────────────────────────────────────────────────────────"
   style 0-99 dim
-33| "                                                                                                    "
+48| "                                                                                                    "
   style 1-1 inverse
-34| "────────────────────────────────────────────────────────────────────────────────────────────────────"
+49| "────────────────────────────────────────────────────────────────────────────────────────────────────"
   style 0-99 dim
-35| "deepseek-v4-flash  /workspace/project  ↑4.1k ↓227  cache 53%  4% context  tools:"
-  style 0-79 dim
-  style 82-99 dim
-36-37| <blank>
+50| "deepseek-v4-flash  /workspace/project  ↑150 ↓464  cache 98%  4% context  tools:c"
+  style 0-78 dim
+  style 81-99 dim
+51-52| <blank>
diff --git a/packages/core/tools/README.md b/packages/core/tools/README.md
index 089017d545..439fafdc2b 100644
--- a/packages/core/tools/README.md
+++ b/packages/core/tools/README.md
@@ -115,7 +115,7 @@ Returning `undefined` selects generic fallback. Presenters depend only on their
 Under `code` or `both`, the registry exposes the reserved `run_code` transport and a deterministic TypeScript SDK for the current scope; only the program's outer logs and return value re-enter model context. The SDK declares exact `ToolArgsMap` and `ToolOutputMap` entries for every visible tool, and each binding resolves to the tool's canonical JSON value. Each lossless-JSON binding call re-enters the complete tool pipeline sequentially with logged correlation to the outer call. Denials and other failed results reject with the real program-visible `ToolCallError` carrying only `toolName` and `message`; Native content and internal error codes stay outside the Code contract. Ordinary side effects are not rolled back, and sub-call `additionalContexts` are deferred through the parent result to preserve call/result adjacency. Run settlement aborts and drains outstanding bindings; runtime failures surface as `CodeRunFailedError`. See the [Code Mode foundation](../../../.agents/notes/implemented/feature/2026-06-15-code-mode.md), [typed-return contract](../../../.agents/notes/implemented/feature/2026-07-20-code-mode-typed-tool-returns.md), and [code-runtime seam](../../code-runtime/README.md). Try `pnpm run demo:code-mode`.
 
 - **The SDK section** (`tools:sdk`, order 150): a lazy prompt section regenerating, at each assembly, `JsonValue`, exact `ToolArgsMap` / `ToolOutputMap`, `ToolName`, the `ToolCallError` declaration, and a mapped `tools` namespace for the calling scope's visible end capabilities (exotic names via quoted keys), plus fixed usage instructions. Deterministic — lexicographic tool order, byte-identical text for an unchanged tool set (prefix-cache-friendly). The codegen (`jsonSchemaToTs`, exported) handles every unified schema construct and degrades unsupported raw constructs to `unknown`, never throwing during prompt assembly.
-- **The dispatch bridge** (`run_code`'s execute): every binding call is snapshotted as lossless JSON before dispatch (`undefined`, `BigInt`, cycles, sparse arrays, `-0`, and exotic objects reject that one call), serialized through a per-run queue (even `Promise.all` executes underlying calls one at a time in submission order), given the outer execution's opaque token as `parent`, and run through the complete pre-execute → guards → execute → post-execute → result pipeline. A success returns the final canonical value after policy; a failure reaches the worker as one message and becomes `ToolCallError(toolName, message)`. Each sub-call is logged as a `tool/code-dispatch` session event with deterministic id `<parent>:code:<n>` and a bounded Native-content summary; `deriveMessages()` does not surface that event or persist the value. Token correlation lets commit-style observers defer an inner success until the final `run_code` result without exposing the live outer execution; ordinary tool side effects are not rolled back. Every sub-call `additionalContexts` entry is deferred through the outer `ToolRunContext` in dispatch order; the loop appends those contexts only after the parent `run_code` result, preserving adjacency and retaining each source/meta even when the program later fails.
+- **The dispatch bridge** (`run_code`'s execute): every binding call is snapshotted as lossless JSON before dispatch (`undefined`, `BigInt`, cycles, sparse arrays, `-0`, and exotic objects reject that one call), serialized through a per-run queue (even `Promise.all` executes underlying calls one at a time in submission order), given the outer execution's opaque token as `parent`, and run through the complete pre-execute → guards → execute → post-execute → result pipeline. A success returns the final canonical value after policy; a failure reaches the worker as one message and becomes `ToolCallError(toolName, message)`. Each sub-call is logged as a `tool/code-dispatch` session event with deterministic id `<parent>:code:<n>` and the complete model-facing `content`/`isError` outcome (the `tool/result` vocabulary, so UIs render sub-calls through the native path); `deriveMessages()` does not surface that event or persist the canonical value. Token correlation lets commit-style observers defer an inner success until the final `run_code` result without exposing the live outer execution; ordinary tool side effects are not rolled back. Every sub-call `additionalContexts` entry is deferred through the outer `ToolRunContext` in dispatch order; the loop appends those contexts only after the parent `run_code` result, preserving adjacency and retaining each source/meta even when the program later fails.
 - **Settlement discipline**: the bridge owns a run-scoped abort that follows the outer signal in and fires when the run settles for any reason, so a budget expiry aborts an in-flight sub-tool instead of orphaning it; the bridge then drains its queue BEFORE returning, so every `tool/code-dispatch` lands inside the open turn. A failed run throws `CodeRunFailedError` (`code: 'CODE_RUN_FAILED'`, message = the failure kind + captured logs), which the pipeline converts to a structured `isError` the model self-corrects from.
 - **Result boundary**: intermediate binding values cross the worker boundary whole and have no per-binding byte cap. `run_code` returns canonical `{ logs: string[], result?: JsonValue }`; strings render raw, every other present JSON root renders through a stack-safe pretty JSON traversal whose total indentation is capped at ten characters (deeper subtrees stay compact), `null` remains explicit, and absent `result` means the program returned `undefined`. The worker's configurable `maxOutputBytes` (default 64 MiB) applies only to the combined serialized outer log-array, completion-value, or failure-message payloads; fixed result-envelope syntax and presentation whitespace are outside that ledger. Invalid and over-limit completions fail explicitly, and only this outer result is eligible for ordinary spill.
 
@@ -189,5 +189,5 @@ Append-only; newly visible content follows the reusable request prefix and does
 - **Caller-defined subagent and workflow structured outputs remain object-rooted** — this is a consumer-level guard; the shared schema vocabulary and tool outputs support every JSON root.
 - **`timeoutMs` on a definition is declarative only** — the registry never enforces deadlines; enforcement requires the `@deepseek-ai/dsh-timeout-policy` wrapper.
 - **Code Mode is TypeScript-only and the presentation mode is service-wide** — `mode: code`/`both` rejects prompt assembly unless `ctx.codeRuntime.language === 'typescript'`; scoped restrictions/shadows still choose each agent's visible bindings, but one tool cannot be native-only while another is code-only.
-- **Code Mode intermediate values are execution-local and unbounded by bytes** — they cannot be reconstructed from session replay and may exhaust process or worker memory; only the outer `run_code` output has the worker's configurable hard cap.
+- **Code Mode intermediate values are execution-local and unbounded by bytes** — the canonical typed values cannot be reconstructed from session replay and may exhaust process or worker memory; only the outer `run_code` output has the worker's configurable hard cap. The rendered `content` of every sub-call IS logged verbatim on `tool/code-dispatch`, uncapped and outside spill policy, so programs that read huge files grow the session log by the same bytes (spill integration for the logged copy is deferred work).
 - **`run_code` state is fresh per run** — a persistent REPL-style kernel is rejected for the MVP (cross-call state would be invisible to the log); see [the Code Mode Agent Note](../../../.agents/notes/implemented/feature/2026-06-15-code-mode.md).
diff --git a/packages/core/tools/src/code-mode.ts b/packages/core/tools/src/code-mode.ts
index 9497839607..7ac2e267a5 100644
--- a/packages/core/tools/src/code-mode.ts
+++ b/packages/core/tools/src/code-mode.ts
@@ -5,7 +5,6 @@
  * @module @deepseek-ai/dsh-tools/src/code-mode
  */
 
-import { parse } from 'node:path'
 import { CallId, HarnessError } from '@deepseek-ai/dsh-llm'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import type { CodeBindingFunction, CodeRunResult, CodeRuntime } from '@deepseek-ai/dsh-code-runtime'
@@ -21,17 +20,16 @@ declare module '@deepseek-ai/dsh-session' {
      * `run_code` call id, the deterministic sub-call id
      * (`<parent>:code:<n>`), the tool `name` with its JSON-normalized
      * `arguments` — the exact value dispatched, normalized BEFORE dispatch,
-     * so this append can never fail on payload shape — whether the sub-call
-     * errored, and a bounded `resultSummary` of its model-facing text. Before
-     * bounding, occurrences of a non-root session workspace path are
-     * normalized to `.` so host-specific absolute path lengths cannot change
-     * the summary.
+     * so this append can never fail on payload shape — and the sub-call's
+     * complete model-facing outcome in `tool/result`'s own vocabulary
+     * (`content` + `isError`), so UIs render a sub-call through the exact
+     * code path that renders a native call.
      * Log-only: `deriveMessages()` ignores it, so sub-calls never re-enter
      * model context; persistence and UIs get every call. Appended inside the
      * parent `run_code`'s execution (the bridge drains its queue before
      * returning), so the turn-enclosure invariant holds by construction.
      */
-    'tool/code-dispatch': { parentCallId: CallId; subCallId: CallId; name: string; arguments: unknown; isError: boolean; resultSummary: string }
+    'tool/code-dispatch': { parentCallId: CallId; subCallId: CallId; name: string; arguments: unknown; isError: boolean; content: ContentBlock[] }
   }
 }
 
@@ -55,35 +53,6 @@ export class CodeRunFailedError extends HarnessError {
   }
 }
 
-/**
- * Cap for a `tool/code-dispatch` event's `resultSummary`. A log-ergonomics
- * constant, not config: the full result already flows to the program; the
- * summary exists so log readers see what a sub-call returned at a glance.
- */
-const SUMMARY_MAX_CHARS = 200
-
-/** Join Native content for the bounded durable sub-dispatch summary; non-text blocks become diagnostic placeholders. */
-function textOf(content: ContentBlock[]): string {
-  return content
-    .map((block) => {
-      switch (block.type) {
-        case 'text': return block.text
-        // ContentBlockMap is merge-extensible — future block kinds land here
-        // deliberately (no assertNever on merge-extensible unions).
-        default: return `[${block.type} content]`
-      }
-    })
-    .join('\n')
-}
-
-/** Normalize workspace paths, then bound a sub-call's model-facing text for its durable log summary. */
-function summarize(text: string, cwd: string | undefined): string {
-  const stableText = cwd === undefined || cwd === parse(cwd).root
-    ? text
-    : text.replaceAll(cwd, '.')
-  return stableText.length > SUMMARY_MAX_CHARS ? `${stableText.slice(0, SUMMARY_MAX_CHARS)}…` : stableText
-}
-
 /**
  * Snapshot one binding call's argument as lossless JSON, then snapshot that
  * detached value again so dispatch and logging stay independent without
@@ -221,6 +190,13 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
       + 'Only what you print or return comes back — curate it.',
     parameters: {
       code: { type: 'string', required: true, description: 'The program: the body of an async TypeScript function.' },
+      description: {
+        type: 'string',
+        required: true,
+        description: 'Clear, concise description of what this program does in active voice, '
+          + '5-10 words (shown in the UI). Examples: "Count TODO markers across packages"; '
+          + '"Read failing test and its fixture"; "Rename config key in every cordis.yml".',
+      },
     },
     output: {
       schema: {
@@ -238,6 +214,9 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
       },
     },
     async execute(args, exec): Promise<RunCodeOutput> {
+      if (args.description.trim().length === 0) {
+        throw new Error('invalid description: expected a non-empty string')
+      }
       const runtime = requireRuntime()
 
       // The run-scoped abort: follows the outer signal in, and fires when the
@@ -288,7 +267,6 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
           for (const context of result.additionalContexts ?? []) {
             exec.deferContext(context)
           }
-          const text = textOf(result.content)
           exec.agent?.session.append('tool/code-dispatch', {
             parentCallId: exec.callId,
             subCallId,
@@ -298,7 +276,9 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
             // this record from what it actually received.
             arguments: normalized.logged,
             isError: result.isError,
-            resultSummary: summarize(text, exec.agent.session.header.cwd),
+            // The registry deep-froze this projection at result finalization;
+            // append snapshots it again, so the log copy stays detached.
+            content: result.content,
           })
           return result.isError
             ? { isError: true as const, message: result.error.message }
@@ -363,10 +343,11 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
         exec.signal.removeEventListener('abort', onOuterAbort)
       }
     },
-    // The program is the call's always-visible UI label.
+    // The model-authored description is the call's always-visible UI label
+    // (the bash `description` precedent); the program itself rides rawInput.
     presentCall: args => ({
       card: 'generic',
-      title: args.code,
+      title: args.description,
       kind: 'execute',
       rawInput: args.code,
     }),
diff --git a/packages/core/tools/tests/code-mode.spec.ts b/packages/core/tools/tests/code-mode.spec.ts
index 14f80c66d2..b19baa5c0d 100644
--- a/packages/core/tools/tests/code-mode.spec.ts
+++ b/packages/core/tools/tests/code-mode.spec.ts
@@ -87,11 +87,11 @@ function registerEcho(ctx: Context, name = 'echo'): unknown[] {
 }
 
 /** A structural fake of the owning agent: captures session appends. */
-function fakeAgent(options: { cwd?: string } = { cwd: '/workspace' }): { agent: Agent; events: { type: string; data: unknown }[] } {
+function fakeAgent(): { agent: Agent; events: { type: string; data: unknown }[] } {
   const events: { type: string; data: unknown }[] = []
   const agent = {
     session: {
-      header: options.cwd === undefined ? {} : { cwd: options.cwd },
+      header: { cwd: '/workspace' },
       append: (type: string, data: unknown) => { events.push({ type, data }) },
     },
   } as unknown as Agent
@@ -99,12 +99,16 @@ function fakeAgent(options: { cwd?: string } = { cwd: '/workspace' }): { agent:
 }
 
 /** Dispatch run_code through the registry pipeline, as the loop would. */
-async function runCode(ctx: Context, code: string, extras: { agent?: Agent; signal?: AbortSignal } = {}): Promise<ToolExecutionResult> {
+async function runCode(
+  ctx: Context,
+  code: string,
+  extras: { agent?: Agent; signal?: AbortSignal; description?: string } = {},
+): Promise<ToolExecutionResult> {
   return ctx.tools.execute({
     signal: testToolSignal,
     callId: CallId('call-1'),
     name: RUN_CODE_NAME,
-    arguments: { code },
+    arguments: { code, description: extras.description ?? 'Run the test program' },
     ...extras.agent ? { agent: extras.agent } : {},
     ...extras.signal ? { signal: extras.signal } : {},
   })
@@ -374,8 +378,14 @@ describe('the run_code dispatch bridge', () => {
     expect(calls).toEqual([{ value: 'one' }, { value: 'two' }])
     const dispatches = events.filter(event => event.type === 'tool/code-dispatch')
     expect(dispatches.map(event => event.data)).toEqual([
-      { parentCallId: 'call-1', subCallId: 'call-1:code:1', name: 'echo', arguments: { value: 'one' }, isError: false, resultSummary: 'echo:one' },
-      { parentCallId: 'call-1', subCallId: 'call-1:code:2', name: 'echo', arguments: { value: 'two' }, isError: false, resultSummary: 'echo:two' },
+      {
+        parentCallId: 'call-1', subCallId: 'call-1:code:1', name: 'echo',
+        arguments: { value: 'one' }, isError: false, content: [{ type: 'text', text: 'echo:one' }],
+      },
+      {
+        parentCallId: 'call-1', subCallId: 'call-1:code:2', name: 'echo',
+        arguments: { value: 'two' }, isError: false, content: [{ type: 'text', text: 'echo:two' }],
+      },
     ])
     expect(result.meta).toBeUndefined()
   })
@@ -693,19 +703,26 @@ describe('the run_code dispatch bridge', () => {
     expect((result.content[0] as { text: string }).text).toContain('requires a code runtime')
   })
 
-  it('presents the program as the execute-card title', async () => {
+  it('presents the model-authored description as the execute-card title over the program input', async () => {
     const { ctx } = await setup({ mode: 'code' })
     const tool = ctx.tools.get(RUN_CODE_NAME)!
-    // The program is the title, mirroring how command tools label their cards
-    // with the command while retaining the same value in the expanded input.
-    expect(tool.presentCall?.({ code: 'return 1' })).toEqual({
+    // The description labels the card (the bash description precedent); the
+    // program itself remains the expanded raw input.
+    expect(tool.presentCall?.({ code: 'return 1', description: 'Return the constant one' })).toEqual({
       card: 'generic',
-      title: 'return 1',
+      title: 'Return the constant one',
       kind: 'execute',
       rawInput: 'return 1',
     })
   })
 
+  it('rejects a whitespace-only description with a structured isError', async () => {
+    const { ctx } = await setup({ mode: 'code' })
+    const result = await runCode(ctx, 'return 1', { description: '   ' })
+    expect(result.isError).toBe(true)
+    expect((result.content[0] as { text: string }).text).toContain('invalid description')
+  })
+
   it.each([
     ['logs only', { logs: ['printed'] }, 'printed'],
     ['result only', { logs: [], value: 'returned' }, 'returned'],
@@ -759,7 +776,7 @@ describe('the run_code dispatch bridge', () => {
     expect('presentResult' in tool).toBe(false)
   })
 
-  it('renders non-text sub-result blocks as placeholders and truncates long event summaries', async () => {
+  it('logs the complete sub-result content verbatim, non-text blocks and long text included', async () => {
     const { ctx, runtime } = await setup({ mode: 'code' })
     const { agent, events } = fakeAgent()
     const long = 'x'.repeat(300)
@@ -786,58 +803,10 @@ describe('the run_code dispatch bridge', () => {
     expect(result.isError).toBe(false)
     expect((result.content[0] as { text: string }).text).toBe('mixed-value')
     const dispatch = events.find(event => event.type === 'tool/code-dispatch')?.data as SessionEventMap['tool/code-dispatch']
-    expect(dispatch.resultSummary.length).toBe(201)
-    expect(dispatch.resultSummary.endsWith('…')).toBe(true)
-  })
-
-  it('normalizes the session workspace root before bounding durable result summaries', async () => {
-    const { ctx, runtime } = await setup({ mode: 'code' })
-    ctx.tools.register(defineTool({
-      name: 'workspace_path',
-      description: 'Return a path beneath the session workspace.',
-      parameters: {},
-      output: {
-        schema: { type: 'string' },
-        render: (_args, value) => [{ type: 'text', text: value }],
-      },
-      execute(_args, exec) {
-        const cwd = exec.agent?.session.header.cwd ?? ''
-        return Promise.resolve(`<path>${cwd}/nested/task.txt</path>\n${'x'.repeat(240)}`)
-      },
-    }))
-    runtime.behavior = async request => ({
-      logs: [],
-      value: await request.bindings[0]!.functions.workspace_path!({}),
-    })
-
-    const short = fakeAgent({ cwd: '/tmp/workspace' })
-    const long = fakeAgent({ cwd: `/tmp/${'long-segment/'.repeat(30)}workspace` })
-    const shortResult = await runCode(ctx, 'program', { agent: short.agent })
-    const longResult = await runCode(ctx, 'program', { agent: long.agent })
-    const shortDispatch = short.events[0]!.data as SessionEventMap['tool/code-dispatch']
-    const longDispatch = long.events[0]!.data as SessionEventMap['tool/code-dispatch']
-
-    expect(shortResult.content).not.toEqual(longResult.content)
-    expect(shortDispatch.resultSummary).toBe(longDispatch.resultSummary)
-    expect(shortDispatch.resultSummary).toHaveLength(201)
-    expect(shortDispatch.resultSummary).toMatch(/^<path>\.\/nested\/task\.txt<\/path>\n.+…$/)
-  })
-
-  it('leaves result summaries unchanged when a session cwd is absent or is the filesystem root', async () => {
-    const { ctx, runtime } = await setup({ mode: 'code' })
-    registerEcho(ctx)
-    runtime.behavior = async request => ({
-      logs: [],
-      value: await request.bindings[0]!.functions.echo!({ value: '/workspace/value' }),
-    })
-
-    const absent = fakeAgent({})
-    const root = fakeAgent({ cwd: '/' })
-    await runCode(ctx, 'program', { agent: absent.agent })
-    await runCode(ctx, 'program', { agent: root.agent })
-
-    expect((absent.events[0]!.data as SessionEventMap['tool/code-dispatch']).resultSummary).toBe('echo:/workspace/value')
-    expect((root.events[0]!.data as SessionEventMap['tool/code-dispatch']).resultSummary).toBe('echo:/workspace/value')
+    expect(dispatch.content).toEqual([
+      { type: 'text', text: long },
+      { type: 'reasoning', text: 'hidden' },
+    ])
   })
 
   it('rejects undefined, getter-throwing, exotic, and unrepresentable binding arguments before dispatch', async () => {
@@ -1067,7 +1036,7 @@ describe('the run_code dispatch bridge', () => {
       name: 'echo',
       arguments: { value: 'x' },
       isError: false,
-      resultSummary: 'echo:x',
+      content: [{ type: 'text', text: 'echo:x' }],
     })
     const derived = session.deriveMessages()
     expect(derived).toHaveLength(1)
diff --git a/packages/plan/plan-mode/tests/plan-mode.spec.ts b/packages/plan/plan-mode/tests/plan-mode.spec.ts
index a7f7743497..f55cd448d9 100644
--- a/packages/plan/plan-mode/tests/plan-mode.spec.ts
+++ b/packages/plan/plan-mode/tests/plan-mode.spec.ts
@@ -752,7 +752,7 @@ describe('exit_plan_mode', () => {
     const result = await ctx.tools.execute({
       callId: CallId(`call-exit-${++callCounter}`),
       name: RUN_CODE_NAME,
-      arguments: { code: `return await tools.${EXIT_PLAN_MODE}({ plan: ${JSON.stringify(plan)} })` },
+      arguments: { code: `return await tools.${EXIT_PLAN_MODE}({ plan: ${JSON.stringify(plan)} })`, description: 'Submit the plan for review' },
       signal: new AbortController().signal,
       agent,
     })
diff --git a/packages/spill/spill-policy/tests/spill-policy.spec.ts b/packages/spill/spill-policy/tests/spill-policy.spec.ts
index 364c4c49ae..120baf197e 100644
--- a/packages/spill/spill-policy/tests/spill-policy.spec.ts
+++ b/packages/spill/spill-policy/tests/spill-policy.spec.ts
@@ -204,6 +204,7 @@ describe('outer Code Mode failure capture', () => {
       name: 'run_code',
       arguments: {
         code: 'console.log("HEAD-" + "x".repeat(300)); console.log("TAIL-" + "y".repeat(300)); return "unreachable";',
+        description: 'Print oversized head and tail lines',
       },
       agent: agent as never,
     })
diff --git a/packages/subagent/subagent-inprocess/tests/structured.spec.ts b/packages/subagent/subagent-inprocess/tests/structured.spec.ts
index bb4cf32544..7f458239fe 100644
--- a/packages/subagent/subagent-inprocess/tests/structured.spec.ts
+++ b/packages/subagent/subagent-inprocess/tests/structured.spec.ts
@@ -439,7 +439,7 @@ describe('in-process structured output', () => {
 
   it('keeps pure Code Mode at one wire tool and exposes structured capture through the SDK only', async () => {
     const { ctx, parent, adapter } = await setup([
-      toolCallResponse('c1', RUN_CODE_NAME, { code: 'return await tools.structured_output({ answer: 12 })' }),
+      toolCallResponse('c1', RUN_CODE_NAME, { code: 'return await tools.structured_output({ answer: 12 })', description: 'Capture the structured answer' }),
     ], {
       toolMode: 'code',
       codeRun: async (request) => {
@@ -465,7 +465,7 @@ describe('in-process structured output', () => {
 
   it('discards a nested capture when the enclosing run_code execution fails', async () => {
     const { ctx, parent, adapter } = await setup([
-      toolCallResponse('c1', RUN_CODE_NAME, { code: 'await tools.structured_output({ answer: 12 }); throw new Error("boom")' }),
+      toolCallResponse('c1', RUN_CODE_NAME, { code: 'await tools.structured_output({ answer: 12 }); throw new Error("boom")', description: 'Capture then fail the program' }),
       textResponse('outer code failed'),
     ], {
       toolMode: 'code',
@@ -494,7 +494,7 @@ describe('in-process structured output', () => {
 
   it('discards a nested capture when post-policy blocks the enclosing run_code result', async () => {
     const { ctx, parent, adapter } = await setup([
-      toolCallResponse('c1', RUN_CODE_NAME, { code: 'return await tools.structured_output({ answer: 12 })' }),
+      toolCallResponse('c1', RUN_CODE_NAME, { code: 'return await tools.structured_output({ answer: 12 })', description: 'Capture the structured answer' }),
       textResponse('outer code was blocked'),
     ], {
       toolMode: 'code',
diff --git a/packages/ui/tui/tests/snapshots/code-mode-pending.expected.txt b/packages/ui/tui/tests/snapshots/code-mode-pending.expected.txt
index 2bfeb79449..c246a00b69 100644
--- a/packages/ui/tui/tests/snapshots/code-mode-pending.expected.txt
+++ b/packages/ui/tui/tests/snapshots/code-mode-pending.expected.txt
@@ -1,7 +1,7 @@
 terminal 96x36 buffer=normal length=36 base=0 viewport=0
 lifecycle started=1 stopped=0 progress=inactive
 title "DSH snapshot"
-cursor hidden column=1 viewportRow=13 bufferRow=13
+cursor hidden column=1 viewportRow=12 bufferRow=12
 buffer
 0| " DEEPSEEK HARNESS"
   style 1-8 fg=bright-blue bold
@@ -13,30 +13,27 @@ buffer
 3| <blank>
 4| "▌ "
   style 0-0 fg=yellow
-5| "▌ ◌ const first = await tools.bash({ command: 'echo CODE_ONE' })                                "
+5| "▌ ◌ Echo two markers and combine them                                                           "
   style 0-0 fg=yellow
   style 2-2 fg=yellow bold
-  style 3-95 bold
-6| "▌ const second = await tools.bas                                                                "
+  style 3-36 bold
+6| "▌ const first = await tools.bash({ command: 'echo CODE_ONE' })                                  "
   style 0-0 fg=yellow
-  style 2-31 bold
-7| "▌ const first = await tools.bash({ command: 'echo CODE_ONE' })                                  "
+7| "▌ const second = await tools.bash({ command: 'echo CODE_TWO' })                                 "
   style 0-0 fg=yellow
-8| "▌ const second = await tools.bash({ command: 'echo CODE_TWO' })                                 "
+8| "▌ console.log(first, second)                                                                    "
   style 0-0 fg=yellow
-9| "▌ console.log(first, second)                                                                    "
+9| "▌ return `${first}+${second}`                                                                   "
   style 0-0 fg=yellow
-10| "▌ return `${first}+${second}`                                                                   "
+10| "▌ "
   style 0-0 fg=yellow
-11| "▌ "
-  style 0-0 fg=yellow
-12| "────────────────────────────────────────────────────────────────────────────────────────────────"
+11| "────────────────────────────────────────────────────────────────────────────────────────────────"
   style 0-95 dim
-13| "                                                                                                "
+12| "                                                                                                "
   style 1-1 inverse
-14| "────────────────────────────────────────────────────────────────────────────────────────────────"
+13| "────────────────────────────────────────────────────────────────────────────────────────────────"
   style 0-95 dim
-15| "deepseek-v4-flash  /workspace/project  ↑0 ↓0                         0% context  tools:collapsed"
+14| "deepseek-v4-flash  /workspace/project  ↑0 ↓0                         0% context  tools:collapsed"
   style 0-43 dim
   style 69-95 dim
-16-35| <blank>
+15-35| <blank>
diff --git a/packages/ui/tui/tests/tui.snapshot.ts b/packages/ui/tui/tests/tui.snapshot.ts
index 82830a5ca0..1dc6ffa7cd 100644
--- a/packages/ui/tui/tests/tui.snapshot.ts
+++ b/packages/ui/tui/tests/tui.snapshot.ts
@@ -364,6 +364,7 @@ describe('TUI terminal-state snapshots', () => {
       name: 'run_code',
       arguments: {
         code: "const first = await tools.bash({ command: 'echo CODE_ONE' })\nconst second = await tools.bash({ command: 'echo CODE_TWO' })\nconsole.log(first, second)\nreturn `${first}+${second}`",
+        description: 'Echo two markers and combine them',
       },
     }
     await renderAfter(harness, () => { appendToolCalls(harness.session, [call]) })
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7894b009ad..24164d7fb5 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -155,6 +155,9 @@ importers:
       '@deepseek-ai/dsh-client-ui-workspace':
         specifier: workspace:^
         version: link:../../packages/client/ui-workspace
+      '@deepseek-ai/dsh-code-runtime-worker':
+        specifier: workspace:^
+        version: link:../../packages/code-runtime/code-runtime-worker
       '@deepseek-ai/dsh-compact-basic':
         specifier: workspace:^
         version: link:../../packages/compact/compact-basic