From c3c10820baee56dc3bbc8f0cf2ba9e28fd51c5ee Mon Sep 17 00:00:00 2001
From: Tianyi Cui <53024+tianyicui@users.noreply.github.com>
Date: Sun, 26 Jul 2026 18:29:09 +0800
Subject: [PATCH] fix(tools): bound the shaped-append side channel; total error
 containment; recorded spill snapshot
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Responding to ds-review-bot round 2 on #661:

- logWork is bounded: past maxParallelSubCalls pending shaped-append tasks
  the ordered commit lane holds (Promise.race drains one), so a slow spill
  backend backpressures the run instead of accumulating unbounded pending
  I/O and retained results. Tasks self-remove on settlement; run
  settlement still drains every task inside the open turn. New spill test
  drives three oversized reads against a hung backend at cap 1 and proves
  the third dispatch cannot start until a save drains.
- shapeDispatchLog's catch uses errorMessage() (total), so a thrown value
  with a throwing toString cannot escape the containment and lose the
  settle event.
- CodeDispatchLog.content documented as the RENDERED result projection
  (native tool/result vocabulary), not what the program received — the
  program gets the structured value; doc pair + type-equiv re-synced.
- New RECORDED tui-agent snapshot scenario code-mode-dispatch-spill: the
  real Loader-visible composition (worker runtime + spill-local + policy)
  drives an oversized bash sub-call end-to-end; replay proves the durable
  dispatch copy is bounded to preview + locator while the program value
  stays whole (the outer result carries just the line count).

Agent Note updated (both languages).
---
 ...26-07-26-code-dispatch-log-spill.i18n.yaml |   4 +-
 .../2026-07-26-code-dispatch-log-spill.md     |   2 +-
 .../2026-07-26-code-dispatch-log-spill.zh.md  |   2 +-
 docs/config-catalog.md                        |   2 +-
 docs/cordis-catalog/services.md               |   2 +-
 docs/core-data-structures/tools.i18n.yaml     |   4 +-
 docs/core-data-structures/tools.md            |   6 +-
 docs/core-data-structures/tools.zh.md         |   6 +-
 .../code-mode-dispatch-spill/session.jsonl    | 194 ++++++++++++++++++
 .../terminal.expected.txt                     |  65 ++++++
 examples/tui-agent/tests/tui.snapshot.ts      |  32 +++
 packages/core/tools/src/code-mode.ts          |  20 +-
 packages/core/tools/src/index.ts              |   8 +-
 .../spill-policy/tests/spill-policy.spec.ts   |  60 ++++++
 14 files changed, 384 insertions(+), 23 deletions(-)
 create mode 100644 examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/session.jsonl
 create mode 100644 examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/terminal.expected.txt

diff --git a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.i18n.yaml b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.i18n.yaml
index f00ecd5d2a..b00bff1000 100644
--- a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.i18n.yaml
+++ b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.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
-2026-07-26-code-dispatch-log-spill.md: 2668c195a43ae1f6011c09413338a23caf75401e
-2026-07-26-code-dispatch-log-spill.zh.md: e084ae80d7fed864c7f296b1fd6db713acf7a2b0
+2026-07-26-code-dispatch-log-spill.md: 65af7808c493867cb13042a4f169ffdf05eb4538
+2026-07-26-code-dispatch-log-spill.zh.md: e1293e62f9de9860300428c5c0d25c5404dc76f9
diff --git a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.md b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.md
index 2668c195a4..65af7808c4 100644
--- a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.md
+++ b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.md
@@ -14,7 +14,7 @@ Since the full-content dispatch logging landed, a `run_code` program that reads
 
 **A log-shaping waterfall on the registry, and the spill policy as its first listener.**
 
-- **Seam**: `tools/code-dispatch-log` — a scope-filtered waterfall the bridge runs (via `registry.shapeDispatchLog`, contained: a throwing listener falls back to the unshaped content) over each settled sub-dispatch before appending `tool/code-dispatch`. The payload (`CodeDispatchLog`) carries the outer execution, the hoisted `agent` routing key, the sub-call identity, and the default content. Only the durable copy is shapeable — the program already received the complete value across the worker boundary, and the model sees neither.
+- **Seam**: `tools/code-dispatch-log` — a scope-filtered waterfall the bridge runs (via `registry.shapeDispatchLog`, contained: a throwing listener falls back to the unshaped content, with total error formatting so a hostile thrown value cannot escape the containment) over each settled sub-dispatch before appending `tool/code-dispatch`. The payload (`CodeDispatchLog`) carries the outer execution, the hoisted `agent` routing key, the sub-call identity, and the default content — the RENDERED result projection a native `tool/result` would carry (the program itself received the structured `value`). Only the durable copy is shapeable; the model sees neither. Shaping runs OFF the program path as tracked side work, but bounded: past `maxParallelSubCalls` pending log tasks the ordered commit lane holds, so a slow spill backend backpressures the run instead of accumulating unbounded pending I/O; run settlement still drains every task inside the open turn.
 - **Policy**: `dsh-spill-policy` registers a second arm on the new seam sharing the exact replacement pipeline of its model-facing arm (same `maxInlineBytes` cap, same preview + locator + within-cap invariant, same best-effort fallbacks), with the artifact labeled `dispatch` under the sub-call id. UIs and replay read the full text through the spill artifact exactly as they do for spilled native results, so the native-parity rendering story survives bounding.
 - **One deliberate asymmetry**: the model-facing arm skips `read` (the `read → spill → read again` loop); the dispatch-log arm bounds `read` sub-calls too — a log copy is not model context, so the loop cannot happen, and `read` is precisely the tool that produces huge logs.
 
diff --git a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.zh.md b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.zh.md
index e084ae80d7..e1293e62f9 100644
--- a/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.zh.md
+++ b/.agents/notes/implemented/feature/2026-07-26-code-dispatch-log-spill.zh.md
@@ -14,7 +14,7 @@ Status: implemented
 
 **在注册表上增设一个日志整形 waterfall（瀑布式事件），spill 策略作为其第一个监听器。**
 
-- **Seam**：`tools/code-dispatch-log`，一个按作用域过滤的 waterfall，由桥接层在追加 `tool/code-dispatch` 之前对每个已结算的子分发运行（经由 `registry.shapeDispatchLog`，且故障被兜住：监听器抛出异常时回退到未整形的内容）。载荷（`CodeDispatchLog`）携带外层执行、提升出来的 `agent` 路由键、子调用标识与默认内容。可整形的只有持久副本：程序已经跨 worker 边界收到了完整的值，而模型两者都看不到。
+- **Seam**：`tools/code-dispatch-log`，一个按作用域过滤的 waterfall，由桥接层在追加 `tool/code-dispatch` 之前对每个已结算的子分发运行（经由 `registry.shapeDispatchLog`，且故障被兜住：监听器抛出异常时回退到未整形的内容，并用全防御的错误格式化确保恶意抛出值无法逃出兜底）。载荷（`CodeDispatchLog`）携带外层执行、提升出来的 `agent` 路由键、子调用标识与默认内容——即原生 `tool/result` 所载的渲染后结果投影（程序本身收到的是结构化 `value`）。可整形的只有持久副本；模型两者都看不到。整形作为被跟踪的旁路工作在程序路径之外运行，但有界：待处理日志任务超过 `maxParallelSubCalls` 时有序提交车道会暂停，因此慢速 spill 后端会对整个 run 施加背压，而不是无限累积待完成 I/O；run 结算仍会在开放轮次内排空全部任务。
 - **策略**：`dsh-spill-policy` 在新 seam 上注册第二个分支，与其面向模型的分支共用一模一样的替换流水线（同样的 `maxInlineBytes` 上限、同样的预览 + 定位符 + 不超上限不变式、同样的尽力而为回退），产物以 `dispatch` 为标签，记在子调用 id 名下。UI 与回放通过 spill 产物读取全文，方式与读取被 spill 的原生结果完全相同，因此与原生同等保真的渲染在施加边界之后依然成立。
 - **一处有意的不对称**：面向模型的分支跳过 `read`（避免 `read → spill → read again` 循环）；分发日志分支则连 `read` 子调用也施加边界：日志副本不是模型上下文，该循环因此不可能发生，而 `read` 恰恰是会产生巨大日志的那个工具。
 
diff --git a/docs/config-catalog.md b/docs/config-catalog.md
index 058eb65eeb..cf0b45c1ff 100644
--- a/docs/config-catalog.md
+++ b/docs/config-catalog.md
@@ -1718,7 +1718,7 @@ export interface Config {
 export type ToolPresentationMode = 'native' | 'code' | 'both'
 ```
 
-Source: [`packages/core/tools/src/index.ts:564`](../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:566`](../packages/core/tools/src/index.ts)
 
 ## `@deepseek-ai/dsh-tui`
 
diff --git a/docs/cordis-catalog/services.md b/docs/cordis-catalog/services.md
index 6facbbb9b3..918382c5fe 100644
--- a/docs/cordis-catalog/services.md
+++ b/docs/cordis-catalog/services.md
@@ -1859,7 +1859,7 @@ async execute(exec: ToolExecutionInput): Promise<ToolExecutionResult>
 
 Types: [CodeDispatchLog](../core-data-structures/tools.md) · [ContentBlock](../core-data-structures/core.md) · [ScopeKey](../core-data-structures/scope.md) · [ToolDefinition](../core-data-structures/tools.md) · [ToolExecutionInput](../core-data-structures/tools.md) · [ToolExecutionMode](../core-data-structures/tools.md) · [ToolExecutionResult](../core-data-structures/tools.md) · [ToolGuard](../core-data-structures/tools.md) · [ToolRestriction](../core-data-structures/tools.md) · [ToolSchema](../core-data-structures/tools.md)
 
-Source: [`packages/core/tools/src/index.ts:677`](../../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:688`](../../packages/core/tools/src/index.ts)
 
 ## `ctx.tui` — `TuiExtensionService` (abstract seam)
 
diff --git a/docs/core-data-structures/tools.i18n.yaml b/docs/core-data-structures/tools.i18n.yaml
index 19c6cb4612..7c82b890b7 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: 389c54bf625f762257a4830ed915d526230090ab
-tools.zh.md: fba3453fa91be2544eb3ab94ca67aaf0452958b2
+tools.md: 250e869397f8ecb128d5b644ff7506376d0657c6
+tools.zh.md: 96fc9d3eeda0240e195beb11bea088d5606d4757
diff --git a/docs/core-data-structures/tools.md b/docs/core-data-structures/tools.md
index 389c54bf62..250e869397 100644
--- a/docs/core-data-structures/tools.md
+++ b/docs/core-data-structures/tools.md
@@ -238,8 +238,10 @@ Code Mode's bridge additionally exposes each settled sub-dispatch to the `tools/
  * One settled `run_code` sub-dispatch about to be logged, as seen by the
  * `tools/code-dispatch-log` waterfall: the parent execution (session owner,
  * outer call identity), the sub-call identity, and the outcome whose durable
- * copy a listener may reshape. The complete `content` is what the program
- * already received; only the `tool/code-dispatch` event's copy changes.
+ * copy a listener may reshape. `content` is the RENDERED result projection
+ * (what a native `tool/result` would carry) — the program itself received
+ * the structured `value` (or just the error message on failure); only the
+ * `tool/code-dispatch` event's copy changes.
  */
 interface CodeDispatchLog {
   /** The outer `run_code` execution. */
diff --git a/docs/core-data-structures/tools.zh.md b/docs/core-data-structures/tools.zh.md
index fba3453fa9..96fc9d3eed 100644
--- a/docs/core-data-structures/tools.zh.md
+++ b/docs/core-data-structures/tools.zh.md
@@ -238,8 +238,10 @@ Code Mode 的桥接层还会把每个已结算的子分派暴露给 `tools/code-
  * One settled `run_code` sub-dispatch about to be logged, as seen by the
  * `tools/code-dispatch-log` waterfall: the parent execution (session owner,
  * outer call identity), the sub-call identity, and the outcome whose durable
- * copy a listener may reshape. The complete `content` is what the program
- * already received; only the `tool/code-dispatch` event's copy changes.
+ * copy a listener may reshape. `content` is the RENDERED result projection
+ * (what a native `tool/result` would carry) — the program itself received
+ * the structured `value` (or just the error message on failure); only the
+ * `tool/code-dispatch` event's copy changes.
  */
 interface CodeDispatchLog {
   /** The outer `run_code` execution. */
diff --git a/examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/session.jsonl b/examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/session.jsonl
new file mode 100644
index 0000000000..21b88b77ac
--- /dev/null
+++ b/examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/session.jsonl
@@ -0,0 +1,194 @@
+{"type":"session","version":0,"id":"main-session","createdAt":1785052797743,"cwd":"/tmp/dsh-tui-snapshot-code-mode-dispatch-spill-8cOdia"}
+{"type":"turn/start","seq":0,"time":1785052797817,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":1,"time":1785052797818,"data":{"content":[{"type":"text","text":"Using ONE run_code program: call the bash tool exactly once with the command `seq 1 200 | awk '{printf \"line %04d: the quick brown fox jumps over the lazy dog\\n\", $1}'`, then return ONLY the number of lines in its output. Reply with just that number and stop."}],"source":{"kind":"user"}},"surfaceOp":"append"}
+{"type":"session/title","seq":2,"time":1785052797825,"data":{"title":"Using ONE run_code program: call","messageSeqs":[1],"source":{"kind":"fallback"}}}
+{"type":"step/start","seq":3,"time":1785052797826,"data":{"turn":1,"step":1}}
+{"type":"request/header","seq":4,"time":1785052797827,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"assistant/chunk","seq":5,"time":1785052798220,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"assistant/chunk","seq":6,"time":1785052798221,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
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+{"type":"assistant/chunk","seq":146,"time":1785052799702,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","argumentsDelta":";\\n"}}}
+{"type":"assistant/chunk","seq":147,"time":1785052799703,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","argumentsDelta":"return"}}}
+{"type":"assistant/chunk","seq":148,"time":1785052799703,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","argumentsDelta":" lines"}}}
+{"type":"assistant/chunk","seq":149,"time":1785052799731,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","argumentsDelta":";"}}}
+{"type":"assistant/chunk","seq":150,"time":1785052799731,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","argumentsDelta":"\""}}}
+{"type":"assistant/chunk","seq":151,"time":1785052799731,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":1,"id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","argumentsDelta":"}"}}}
+{"type":"assistant/chunk","seq":152,"time":1785052799793,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to write a single run_code program that calls bash exactly once with a specific command, then returns only the number of lines in its output."}}}}
+{"type":"assistant/chunk","seq":153,"time":1785052799793,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"tool-call","id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","arguments":"{\"description\": \"Count lines in seq/awk output\", \"code\": \"const result = await tools.bash({\\n  command: \\\"seq 1 200 | awk '{printf \\\\\\\"line %04d: the quick brown fox jumps over the lazy dog\\\\\\\\n\\\\\\\", $1}'\\\",\\n  description: \\\"Generate 200 lines of text\\\"\\n});\\n\\n// Count lines in stdout\\nconst lines = result.kind === \\\"foreground\\\" ? result.stdout.text.trim().split(\\\"\\\\n\\\").length : 0;\\nreturn lines;\"}"}}}}
+{"type":"assistant/chunk","seq":154,"time":1785052799794,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":90,"outputTokens":186,"cacheReadTokens":3968,"reasoningTokens":32}}}}
+{"type":"assistant/chunk","seq":155,"time":1785052799794,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":156,"time":1785052799798,"data":{"turn":1,"step":1,"content":[{"type":"reasoning","text":"The user wants me to write a single run_code program that calls bash exactly once with a specific command, then returns only the number of lines in its output."},{"type":"tool-call","id":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","arguments":"{\"description\": \"Count lines in seq/awk output\", \"code\": \"const result = await tools.bash({\\n  command: \\\"seq 1 200 | awk '{printf \\\\\\\"line %04d: the quick brown fox jumps over the lazy dog\\\\\\\\n\\\\\\\", $1}'\\\",\\n  description: \\\"Generate 200 lines of text\\\"\\n});\\n\\n// Count lines in stdout\\nconst lines = result.kind === \\\"foreground\\\" ? result.stdout.text.trim().split(\\\"\\\\n\\\").length : 0;\\nreturn lines;\"}"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":90,"outputTokens":186,"cacheReadTokens":3968,"reasoningTokens":32}},"sourceEventSeqs":[5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155],"surfaceOp":"append"}
+{"type":"tool/call","seq":157,"time":1785052799799,"data":{"turn":1,"step":1,"callId":"call_00_R6g9Uzx4h0jeUv9g3fno7490","name":"run_code","arguments":"{\"description\": \"Count lines in seq/awk output\", \"code\": \"const result = await tools.bash({\\n  command: \\\"seq 1 200 | awk '{printf \\\\\\\"line %04d: the quick brown fox jumps over the lazy dog\\\\\\\\n\\\\\\\", $1}'\\\",\\n  description: \\\"Generate 200 lines of text\\\"\\n});\\n\\n// Count lines in stdout\\nconst lines = result.kind === \\\"foreground\\\" ? result.stdout.text.trim().split(\\\"\\\\n\\\").length : 0;\\nreturn lines;\"}"}}
+{"type":"tool/code-dispatch-start","seq":158,"time":1785052799893,"data":{"parentCallId":"call_00_R6g9Uzx4h0jeUv9g3fno7490","subCallId":"call_00_R6g9Uzx4h0jeUv9g3fno7490:code:1","name":"bash","arguments":{"command":"seq 1 200 | awk '{printf \"line %04d: the quick brown fox jumps over the lazy dog\\n\", $1}'","description":"Generate 200 lines of text"}}}
+{"type":"tool/code-dispatch","seq":159,"time":1785052799923,"data":{"parentCallId":"call_00_R6g9Uzx4h0jeUv9g3fno7490","subCallId":"call_00_R6g9Uzx4h0jeUv9g3fno7490:code:1","name":"bash","arguments":{"command":"seq 1 200 | awk '{printf \"line %04d: the quick brown fox jumps over the lazy dog\\n\", $1}'","description":"Generate 200 lines of text"},"isError":false,"content":[{"type":"text","text":"line 0001: the quick brown fox jumps over the lazy dog\nline 0002: the quick brown fox jumps over the lazy dog\nline 0003: the quick brown fox jumps over the lazy dog\nline 0004: the quick s over the lazy dog\nline 0198: the quick brown fox jumps over the lazy dog\nline 0199: the quick brown fox jumps over the lazy dog\nline 0200: the quick brown fox jumps over the lazy dog\n\n\n(Omitted 10629 bytes. Full formatted result stored at: /tmp/dsh-tui-snapshot-code-mode-dispatch-spill-8cOdia/.spill/session-2d2b9e84a250/825a63550249-bash.txt. Use read with offset/limit, or grep this path to search within it.)"}]}}
+{"type":"tool/result","seq":160,"time":1785052799925,"data":{"turn":1,"step":1,"callId":"call_00_R6g9Uzx4h0jeUv9g3fno7490","content":[{"type":"text","text":"200"}],"isError":false},"sourceEventSeqs":[157],"surfaceOp":"append"}
+{"type":"step/end","seq":161,"time":1785052799926,"data":{"turn":1,"step":1}}
+{"type":"step/start","seq":162,"time":1785052799928,"data":{"turn":1,"step":2}}
+{"type":"assistant/chunk","seq":163,"time":1785052800414,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"assistant/chunk","seq":164,"time":1785052800415,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
+{"type":"assistant/chunk","seq":165,"time":1785052800572,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" result"}}}
+{"type":"assistant/chunk","seq":166,"time":1785052800604,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" is"}}}
+{"type":"assistant/chunk","seq":167,"time":1785052800604,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" "}}}
+{"type":"assistant/chunk","seq":168,"time":1785052800604,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"200"}}}
+{"type":"assistant/chunk","seq":169,"time":1785052800604,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" lines"}}}
+{"type":"assistant/chunk","seq":170,"time":1785052800605,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
+{"type":"assistant/chunk","seq":171,"time":1785052800635,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" The"}}}
+{"type":"assistant/chunk","seq":172,"time":1785052800636,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
+{"type":"assistant/chunk","seq":173,"time":1785052800666,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" wants"}}}
+{"type":"assistant/chunk","seq":174,"time":1785052800666,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
+{"type":"assistant/chunk","seq":175,"time":1785052800666,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
+{"type":"assistant/chunk","seq":176,"time":1785052800666,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
+{"type":"assistant/chunk","seq":177,"time":1785052800699,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
+{"type":"assistant/chunk","seq":178,"time":1785052800700,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" just"}}}
+{"type":"assistant/chunk","seq":179,"time":1785052800700,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" that"}}}
+{"type":"assistant/chunk","seq":180,"time":1785052800700,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" number"}}}
+{"type":"assistant/chunk","seq":181,"time":1785052800700,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" and"}}}
+{"type":"assistant/chunk","seq":182,"time":1785052800731,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" stop"}}}
+{"type":"assistant/chunk","seq":183,"time":1785052800731,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
+{"type":"assistant/chunk","seq":184,"time":1785052800731,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":185,"time":1785052800731,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"200"}}}
+{"type":"assistant/chunk","seq":186,"time":1785052800731,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The result is 200 lines. The user wants me to reply with just that number and stop."}}}}
+{"type":"assistant/chunk","seq":187,"time":1785052800731,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"200"}}}}
+{"type":"assistant/chunk","seq":188,"time":1785052800732,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":33,"outputTokens":22,"cacheReadTokens":4224,"reasoningTokens":20}}}}
+{"type":"assistant/chunk","seq":189,"time":1785052800732,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":190,"time":1785052800733,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The result is 200 lines. The user wants me to reply with just that number and stop."},{"type":"text","text":"200"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":33,"outputTokens":22,"cacheReadTokens":4224,"reasoningTokens":20}},"sourceEventSeqs":[163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189],"surfaceOp":"append"}
+{"type":"step/end","seq":191,"time":1785052800733,"data":{"turn":1,"step":2}}
+{"type":"turn/end","seq":192,"time":1785052800733,"data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/terminal.expected.txt b/examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/terminal.expected.txt
new file mode 100644
index 0000000000..aad4b2cd50
--- /dev/null
+++ b/examples/tui-agent/tests/snapshots/code-mode-dispatch-spill/terminal.expected.txt
@@ -0,0 +1,65 @@
+terminal 100x36 buffer=normal length=36 base=0 viewport=0
+lifecycle started=1 stopped=0 progress=inactive
+title "Using ONE run_code program: call — DSH TUI snapshot"
+cursor hidden column=1 viewportRow=26 bufferRow=26
+buffer
+0| " DEEPSEEK HARNESS"
+  style 1-8 fg=bright-blue bold
+  style 10-16 bold
+1| " Using ONE run_code program: call"
+  style 1-32 fg=bright-black
+2| " deepseek-v4-flash  •  main-session"
+  style 1-34 dim
+3| <blank>
+4| "▌ "
+  style 0-0 fg=bright-blue
+5| "▌ You                                                                                               "
+  style 0-0 fg=bright-blue
+  style 2-4 fg=bright-blue bold
+6| "▌ Using ONE run_code program: call the bash tool exactly once with the command seq 1 200 | awk      "
+  style 0-0 fg=bright-blue
+  style 79-99 fg=cyan
+7| "▌ '{printf \"line %04d: the quick brown fox jumps over the lazy dog\\n\", $1}', then return ONLY the   "
+  style 0-0 fg=bright-blue
+  style 2-74 fg=cyan
+8| "▌ number of lines in its output. Reply with just that number and stop.                              "
+  style 0-0 fg=bright-blue
+9| "▌ "
+  style 0-0 fg=bright-blue
+10| <blank>
+11| " Reasoning                                                                                          "
+  style 1-9 fg=bright-black italic
+12| " The user wants me to write a single run_code program that calls bash exactly once with a specific  "
+  style 1-99 fg=bright-black italic
+13| " command, then returns only the number of lines in its output.                                      "
+  style 1-61 fg=bright-black italic
+14| <blank>
+15| "▌ "
+  style 0-0 fg=green
+16| "▌ ✓ Count lines in seq/awk output                                                                   "
+  style 0-0 fg=green
+  style 2-2 fg=green bold
+  style 3-32 bold
+17| "▌ 200                                                                                               "
+  style 0-0 fg=green
+18| "▌ "
+  style 0-0 fg=green
+19| <blank>
+20| " Reasoning                                                                                          "
+  style 1-9 fg=bright-black italic
+21| " The result is 200 lines. The user wants me to reply with just that number and stop.                "
+  style 1-83 fg=bright-black italic
+22| <blank>
+23| " Assistant                                                                                          "
+  style 1-9 fg=bright-magenta bold
+24| " 200                                                                                                "
+25| "────────────────────────────────────────────────────────────────────────────────────────────────────"
+  style 0-99 dim
+26| "                                                                                                    "
+  style 1-1 inverse
+27| "────────────────────────────────────────────────────────────────────────────────────────────────────"
+  style 0-99 dim
+28| "deepseek-v4-flash  /workspace/project  ↑123 ↓208  cache 99%  3% c"
+  style 0-93 dim
+  style 96-99 dim
+29-35| <blank>
diff --git a/examples/tui-agent/tests/tui.snapshot.ts b/examples/tui-agent/tests/tui.snapshot.ts
index 26ba64f23b..1341a22291 100644
--- a/examples/tui-agent/tests/tui.snapshot.ts
+++ b/examples/tui-agent/tests/tui.snapshot.ts
@@ -27,6 +27,8 @@ import * as ToolTodo from '@deepseek-ai/dsh-tool-todo'
 import * as ToolRalph from '@deepseek-ai/dsh-tool-ralph'
 import * as ToolWorkflow from '@deepseek-ai/dsh-tool-workflow'
 import { createTuiChat, FILE_REFERENCE_PROMPT } from '@deepseek-ai/dsh-tui'
+import LocalSpillStore from '@deepseek-ai/dsh-spill-local'
+import * as SpillPolicy from '@deepseek-ai/dsh-spill-policy'
 import UserInteractionService from '@deepseek-ai/dsh-user-interaction'
 import WorkerWorkflowEngine from '@deepseek-ai/dsh-workflow-workerthread'
 import { HeadlessTerminal } from '../../../packages/ui/tui/tests/headless-terminal.ts'
@@ -56,6 +58,13 @@ interface Scenario {
    * mounts it; the rest cover the default, todo-free composition.
    */
   enableTodo?: boolean
+  /**
+   * Mount the spill stack (local backend + policy) with this inline cap, as the
+   * shipped configs do. The dispatch-spill scenario proves the durable
+   * `tool/code-dispatch` copy of an oversized sub-result is bounded to a
+   * preview + locator while the program value stays whole.
+   */
+  spillMaxInlineBytes?: number
 }
 
 const SCENARIOS: Scenario[] = [
@@ -96,6 +105,14 @@ const SCENARIOS: Scenario[] = [
     expectedEventCounts: { 'tool/code-dispatch': 2 },
     recorded: true,
   },
+  {
+    name: 'code-mode-dispatch-spill',
+    composition: 'code',
+    expectedTools: ['run_code'],
+    expectedEventCounts: { 'tool/code-dispatch-start': 1, 'tool/code-dispatch': 1 },
+    recorded: true,
+    spillMaxInlineBytes: 600,
+  },
   {
     name: 'dynamic-workflow',
     composition: 'native',
@@ -225,6 +242,10 @@ async function mountScenarioContext(
   if (scenario.composition === 'code' || scenario.composition === 'advanced') {
     await ctx.plugin(WorkerCodeRuntime, {})
   }
+  if (scenario.spillMaxInlineBytes !== undefined) {
+    await ctx.plugin(LocalSpillStore, { root: join(cwd, '.spill') })
+    await ctx.plugin(SpillPolicy, { maxInlineBytes: scenario.spillMaxInlineBytes })
+  }
   if (scenario.composition === 'advanced') await ctx.plugin(ToolCordis, { vmTimeoutMs: 5_000 })
   if (MODE === 'record' && scenario.recorded) {
     await ctx.plugin(LlmDeepSeek)
@@ -344,6 +365,17 @@ async function runScenario(scenario: Scenario): Promise<ScenarioResult> {
       expect(events.filter(event => event.type === 'user/message' && event.data.source.kind === 'plugin').map(event => (event.data as { content: unknown }).content))
         .toContainEqual([{ type: 'text', text: 'The user switched this session back to the default mode.' }])
     }
+    if (scenario.spillMaxInlineBytes !== undefined) {
+      // The REAL pipeline ran (tools execute on replay too): the durable
+      // dispatch copy is bounded to a preview + locator under the run cwd,
+      // while the outer result still carries the program's whole value.
+      const dispatch = events.find(event => (event.type as string) === 'tool/code-dispatch')
+      const content = (dispatch?.data as { content: { type: string; text?: string }[] }).content
+      const text = content.filter(block => block.type === 'text').map(block => block.text ?? '').join('')
+      expect(Buffer.byteLength(text, 'utf8')).toBeLessThanOrEqual(scenario.spillMaxInlineBytes)
+      expect(text).toContain('Full formatted result stored at:')
+      expect(text).toContain('.spill')
+    }
     expect(events.filter(event => event.type === 'tool/result').every(event => !event.data.isError)).toBe(true)
     expect(events.filter(event => event.type === 'turn/end').every(event => event.data.reason.kind !== 'error')).toBe(true)
     if (scenario.name === 'dynamic-workflow' || scenario.name === 'cordis-dynamic-toolchain') {
diff --git a/packages/core/tools/src/code-mode.ts b/packages/core/tools/src/code-mode.ts
index 7dead97517..f45bea489c 100644
--- a/packages/core/tools/src/code-mode.ts
+++ b/packages/core/tools/src/code-mode.ts
@@ -359,12 +359,9 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
         // entries, awaits the live pool, and drains the ordered commit lane —
         // including a commit already in progress when the program returned.
         await drive()
-        // Every settle's shaped append lands inside the open run_code turn.
-        while (logWork.size > 0) {
-          const pending = [...logWork]
-          await Promise.allSettled(pending)
-          for (const done of pending) logWork.delete(done)
-        }
+        // Every settle's shaped append lands inside the open run_code turn
+        // (tasks self-remove on settlement).
+        while (logWork.size > 0) await Promise.allSettled([...logWork])
       }
 
       // Read through a call, not a bare property: the abort state genuinely
@@ -406,7 +403,7 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
               : { isError: false, value: result.value })
             const agent = exec.agent
             if (agent === undefined) return
-            logWork.add((async () => {
+            const task: Promise<void> = (async () => {
               // The durable copy may be reshaped (e.g. spilled to a preview +
               // locator) by the log-shaping waterfall; the program's value
               // and the model contract are untouched.
@@ -428,7 +425,8 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
                 isError: result.isError,
                 content: logged,
               })
-            })())
+            })().finally(() => { logWork.delete(task) })
+            logWork.add(task)
           }
           pendingQueue.push({
             flight: Promise.resolve(),
@@ -470,6 +468,12 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
                 exec.deferContext(context)
               }
               settle(result)
+              // Backpressure on the shaped-append side channel: pending log
+              // tasks (each retaining a full result while a slow backend
+              // stores it) are bounded by the pool cap — beyond it the
+              // ordered lane waits, so later sub-calls cannot start and
+              // pending I/O/memory cannot grow without bound.
+              while (logWork.size > maxParallel) await Promise.race(logWork)
             },
           })
           wakeup()
diff --git a/packages/core/tools/src/index.ts b/packages/core/tools/src/index.ts
index 8cb2de6d5b..5536cc4753 100644
--- a/packages/core/tools/src/index.ts
+++ b/packages/core/tools/src/index.ts
@@ -289,8 +289,10 @@ export type ToolExecutionMode =
  * One settled `run_code` sub-dispatch about to be logged, as seen by the
  * `tools/code-dispatch-log` waterfall: the parent execution (session owner,
  * outer call identity), the sub-call identity, and the outcome whose durable
- * copy a listener may reshape. The complete `content` is what the program
- * already received; only the `tool/code-dispatch` event's copy changes.
+ * copy a listener may reshape. `content` is the RENDERED result projection
+ * (what a native `tool/result` would carry) — the program itself received
+ * the structured `value` (or just the error message on failure); only the
+ * `tool/code-dispatch` event's copy changes.
  */
 export interface CodeDispatchLog {
   /** The outer `run_code` execution. */
@@ -991,7 +993,7 @@ export class ToolRegistry extends Service {
         () => Promise.resolve(dispatch.content),
       )
     } catch (error: unknown) {
-      this.ctx.logger.warn(`tools: code-dispatch-log listener failed for ${dispatch.name}: ${String(error)}; logging the unshaped content`)
+      this.ctx.logger.warn(`tools: code-dispatch-log listener failed for ${dispatch.name}: ${errorMessage(error)}; logging the unshaped content`)
       return dispatch.content
     }
   }
diff --git a/packages/spill/spill-policy/tests/spill-policy.spec.ts b/packages/spill/spill-policy/tests/spill-policy.spec.ts
index f132c0f98a..32b9483dca 100644
--- a/packages/spill/spill-policy/tests/spill-policy.spec.ts
+++ b/packages/spill/spill-policy/tests/spill-policy.spec.ts
@@ -29,9 +29,12 @@ const testToolSignal = new AbortController().signal
 class StubStore extends SpillStore {
   saves: SaveTextSpill[] = []
   fail = false
+  /** Per-save hang hook: each call awaits the returned promise before completing. */
+  gate: (() => Promise<void>) | undefined
 
   async saveText(input: SaveTextSpill): Promise<SpillRef> {
     if (this.fail) throw new Error('disk full')
+    await this.gate?.()
     this.saves.push(input)
     return {
       locator: SpillLocator(`/spill/${input.suggestedName}`),
@@ -367,6 +370,63 @@ describe('the durable dispatch-log arm', () => {
     expect(smallAfterHuge).toBe(true)
   })
 
+  it('a sustained slow backend backpressures the run instead of accumulating unbounded log tasks', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    // Cap 1: once the hung shaped-append backlog exceeds the cap, the ordered
+    // lane holds inside the second commit, so the THIRD dispatch cannot start
+    // until a pending save drains — the bound is observable as its missing
+    // start event.
+    await ctx.plugin(ToolRegistry, { mode: 'code', maxParallelSubCalls: 1 })
+    await ctx.plugin(StubStore)
+    await ctx.plugin(SpillPolicy, { maxInlineBytes: 100 })
+    await ctx.plugin(WorkerCodeRuntime, {})
+    const store = ctx.spillStore as StubStore
+    const releases: (() => void)[] = []
+    store.gate = () => new Promise<void>((resolve) => { releases.push(resolve) })
+    const events: { type: string; data: unknown }[] = []
+    const agent = {
+      session: {
+        header: { id: SessionId('dispatch-spill-bound'), cwd: '/workspace' },
+        append: (type: string, data: unknown) => { events.push({ type, data }) },
+      },
+    }
+    ctx.tools.register(textTool('huge_read', 'H'.repeat(2_000)))
+    const started = (n: number): boolean => events.some(event => event.type === 'tool/code-dispatch-start'
+      && (event.data as { subCallId: string }).subCallId.endsWith(`:code:${n}`))
+    const runPromise = ctx.tools.execute({
+      signal: testToolSignal,
+      callId: CallId('parent-bound'),
+      name: 'run_code',
+      arguments: {
+        code: 'await tools.huge_read({}); await tools.huge_read({}); await tools.huge_read({}); return "done"',
+        description: 'Three oversized reads against a hung backend',
+      },
+      agent: agent as never,
+    })
+    // Two hung saves = backlog above the cap: the lane must hold before
+    // starting dispatch 3.
+    await vi.waitFor(() => {
+      if (releases.length < 2) throw new Error('second hung save not reached yet')
+    })
+    expect(started(2)).toBe(true)
+    expect(started(3)).toBe(false)
+    releases.shift()!()
+    // Draining one pending save releases the lane; dispatch 3 starts.
+    await vi.waitFor(() => {
+      if (!started(3)) throw new Error('third dispatch not started yet')
+    })
+    while (releases.length > 0) releases.shift()!()
+    const result = await runPromise
+    expect(result.isError).toBe(false)
+    await vi.waitFor(() => {
+      if (releases.length > 0) { while (releases.length > 0) releases.shift()!() }
+      if (events.filter(event => event.type === 'tool/code-dispatch').length !== 3) {
+        throw new Error('settle events still pending')
+      }
+    })
+  })
+
   it('a saveText failure keeps the complete content in the durable log (best-effort)', async () => {
     const ctx = new Context()
     await ctx.plugin(SystemPrompt)