diff --git a/.agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.md b/.agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.md
index 35d40ad0f4..c286efe2d2 100644
--- a/.agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.md
+++ b/.agents/notes/implemented/architecture/2026-06-11-content-block-vocabulary.md
@@ -10,7 +10,7 @@ The harness needs one internal language for messages that the loop, session log,
 
 Own the vocabulary: messages are arrays of typed content blocks (`text`, `reasoning`, `tool-call`, `tool-result`), with the union derived from the merge-extensible `ContentBlockMap` so plugins add block types via declaration merging. The same merge-extensible-map pattern types every "stringly" field (`MessageSource`, `FinishReason`, `TurnTrigger`, `TurnEndReason`). Streaming is a raw chunk protocol; `BlockAssembler` is the single shared assembly implementation. Adapters translate to provider wire formats — mapping cost lives in adapters, where it belongs.
 
-In-session context injection (`context/message`, `steering/message`) renders as tagged user-role envelopes (the system-reminder pattern) rather than a new role, so adapters carry zero burden. Live-adapter validation confirms this rendering for current DeepSeek behavior; a future provider-specific mismatch belongs in that adapter rather than a new canonical role.
+In-session context injection (`context/message`) renders as a tagged user-role envelope (the system-reminder pattern) rather than a new role, so adapters carry zero burden. Live-adapter validation confirms this rendering for current DeepSeek behavior; a future provider-specific mismatch belongs in that adapter rather than a new canonical role. `steering/message` originally shared the envelope but now projects as plain user content; see [the steering-unwrap Agent Note](../simplification/2026-07-20-unwrap-steering-message-projection.md).
 
 ## Alternatives considered
 
diff --git a/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.i18n.yaml b/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.i18n.yaml
new file mode 100644
index 0000000000..e8d3550e66
--- /dev/null
+++ b/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.i18n.yaml
@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# 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-unwrap-steering-message-projection.md: 93be7191a556b6438a0ad265d3cc9bde29f5d0ef
+2026-07-20-unwrap-steering-message-projection.zh.md: 8e3fcd0fbf25c393e7429b0d24bd9a1e38d61e48
diff --git a/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.md b/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.md
new file mode 100644
index 0000000000..93be7191a5
--- /dev/null
+++ b/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.md
@@ -0,0 +1,26 @@
+# Agent Note: Project steering messages as plain user content
+
+Status: implemented
+
+English | [中文](2026-07-20-unwrap-steering-message-projection.zh.md)
+
+## Problem
+
+`Session.deriveEventMessage` rendered `steering/message` inside a `<steering source="…">…</steering>` envelope, mirroring the `context/message` framing. But the two events differ in kind: context injection is ambient, non-conversational material (file-change notices, workspace instructions) where the envelope tells the model "this is not the user speaking", while steering *is* the user (or a plugin acting for the user) speaking mid-turn — "also reply with SECOND", "focus on tests". Wrapping that direction in an XML label distances the model from an instruction it should treat as a first-class user message; recorded transcripts show models reasoning about whether to obey "the steering input" as if it were third-party metadata.
+
+## Decision
+
+`steering/message` projects to a plain user-role message carrying its content blocks verbatim — identical to `user/message` projection. The `<context>` envelope on `context/message` (with its `raw` opt-out) is untouched. The former `renderTagged` helper in `packages/core/session/src/index.ts` is now the context-only `renderContextEnvelope` with no tag parameter. The compaction renderer's `[Steering: …]` label is unaffected: that is a summarization-input format, not model-visible history.
+
+The `source` attribution that the envelope carried is not lost — it remains on the durable `steering/message` event; it just no longer renders into the model transcript.
+
+## Alternatives considered
+
+- **Keep the envelope for plugin-sourced steering only** — splits one projection into two on `source.kind` for no observed benefit; a plugin steering the agent (hook-bridge continuation reasons) also wants the instruction followed, not attributed.
+- **Move the unwrapping into adapters** — the canonical projection is the model-visible contract ("model-visible ⟺ logged"); per-adapter divergence on framing would make the derived transcript adapter-dependent.
+
+## Consequences
+
+- Mid-turn steering reaches the model with the same weight as an ordinary user prompt.
+- The transcript no longer distinguishes a steering injection from a user message; consumers that need the distinction read the durable event log, which keeps `steering/message` and its `source` intact.
+- The [content-block-vocabulary Agent Note](../architecture/2026-06-11-content-block-vocabulary.md)'s tagged-envelope clause now covers `context/message` only and is amended to point here.
diff --git a/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.zh.md b/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.zh.md
new file mode 100644
index 0000000000..8e3fcd0fbf
--- /dev/null
+++ b/.agents/notes/implemented/simplification/2026-07-20-unwrap-steering-message-projection.zh.md
@@ -0,0 +1,26 @@
+# Agent Note: steering 消息投影为普通用户内容
+
+Status: implemented
+
+[English](2026-07-20-unwrap-steering-message-projection.md) | 中文
+
+## 问题
+
+`Session.deriveEventMessage` 曾把 `steering/message` 包在 `<steering source="…">…</steering>` 封套里渲染，与 `context/message` 的框架保持一致。但这两类事件性质不同：上下文注入是环境性的、非对话性的材料（文件变更通知、工作区指令），封套告诉模型「这不是用户在说话」；而 steering（中途引导）恰恰**是**用户（或代表用户的插件）在轮次中途发言——「再回复 SECOND」「专注于测试」。把这种指令包进 XML 标签会让模型把本应作为一等用户消息对待的指令当成第三方元数据；已录制的 transcript（文本记录）显示，模型会推理是否要服从「那条 steering 输入」，仿佛它是旁观者的附注。
+
+## 决策
+
+`steering/message` 投影为普通的 user 角色消息，逐字携带其内容块——与 `user/message` 的投影完全相同。`context/message` 上的 `<context>` 封套（及其 `raw` 退出选项）保持不变。`packages/core/session/src/index.ts` 中原来的 `renderTagged` 辅助函数现在是只服务于 context 的 `renderContextEnvelope`，不再接受标签参数。压缩（compaction）渲染器的 `[Steering: …]` 标注不受影响：那是摘要输入格式，不是模型可见的历史。
+
+封套曾携带的 `source` 归属并未丢失——它仍保留在持久的 `steering/message` 事件上；只是不再渲染进模型 transcript。
+
+## 备选方案
+
+- **仅对插件来源的 steering 保留封套** —— 会按 `source.kind` 把一条投影拆成两条，却没有观察到任何收益；插件引导 agent（智能体）时（钩子桥接器的轮次续行原因）同样希望指令被遵从，而不是被归因。
+- **把去封套的逻辑移入适配器** —— 规范投影就是模型可见契约（「模型可见 ⟺ 已记录」）；让各适配器在框架上各行其是，会使派生的 transcript 依赖于适配器。
+
+## 影响
+
+- 中途引导以与普通用户提示相同的权重到达模型。
+- transcript 不再区分 steering 注入与用户消息；需要这一区分的消费方读取持久事件日志，其中 `steering/message` 及其 `source` 完整保留。
+- [内容块词汇表 Agent Note](../architecture/2026-06-11-content-block-vocabulary.md) 中关于带标签封套的条款现在只覆盖 `context/message`，并已修订为指向本文。
diff --git a/docs/cordis-catalog/services.md b/docs/cordis-catalog/services.md
index 10cd0bbf05..4d7c208510 100644
--- a/docs/cordis-catalog/services.md
+++ b/docs/cordis-catalog/services.md
@@ -820,7 +820,7 @@ fork(source: SessionForkSource, boundary?: number, childSessionId?: SessionId):
 
 Types: [CreateSessionOptions](../core-data-structures/persistence.md) · [Session](../core-data-structures/session.md) · [SessionId](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/index.ts:577`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:574`](../../packages/core/session/src/index.ts)
 
 ## `ctx.skills` — `SkillService`
 
diff --git a/docs/core-data-structures/session.md b/docs/core-data-structures/session.md
index 263d991f86..1b9dfb1a9e 100644
--- a/docs/core-data-structures/session.md
+++ b/docs/core-data-structures/session.md
@@ -433,7 +433,7 @@ declare class Session {
 - `assistant/message` → an assistant message with the event's provider/model provenance and optional adapter-private replay state. Raw `assistant/chunk` events are replay/UI data and are **skipped** in derivation (the assembled message is authoritative). An **empty-content** `assistant/message` is also skipped — a max-tokens step cut off with no content still records an `assistant/message` to host its usage/provenance, but a content-less assistant turn must not enter the provider transcript.
 - `tool/result` → a user message carrying a `tool-result` block.
 - `context/message` → a user-role message at its chronological position. The default `envelope` is `context`, which wraps content as `<context source="…">…</context>`; `envelope: 'raw'` uses caller-owned framing verbatim. Optional JSON `meta` remains in the event log and is never rendered.
-- `steering/message` → a user-role message wrapped in `<steering source="…">…</steering>` at its chronological position.
+- `steering/message` → a user-role message carrying its content verbatim at its chronological position.
 
 Everything else (`turn/*`, `step/*`) is structural and does not project into a message. Token usage is observed on `assistant/message.usage` (the step that produced it); an operational error's step number is on `turn/end.reason` for `kind: 'error'`. Because this unreleased format intentionally has no compatibility promise, seed/load validation rejects request headers without provider+model and assistant messages without provider/model provenance instead of guessing a route for historical data.
 
diff --git a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/session.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/session.jsonl
index 5f6b0e6e9e..baa6a92e9a 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/session.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/session.jsonl
@@ -1,192 +1,67 @@
-{"type":"session","version":0,"id":"02bb4dcf-ffd6-4111-909b-504c7006d821","createdAt":1783352203365,"cwd":"/tmp/acp-snap-cwd-7YNbji"}
-{"type":"turn/start","seq":0,"time":1783352203369,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":1,"time":1783352203370,"data":{"content":[{"type":"text","text":"Reply with the single word FIRST and stop."}],"source":{"kind":"user"}},"surfaceOp":"append"}
-{"type":"step/start","seq":2,"time":1783352203371,"data":{"turn":1,"step":1}}
-{"type":"request/header","seq":3,"time":1783352203372,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"assistant/chunk","seq":4,"time":1783352204036,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
-{"type":"assistant/chunk","seq":5,"time":1783352204036,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
-{"type":"assistant/chunk","seq":6,"time":1783352204247,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
-{"type":"assistant/chunk","seq":7,"time":1783352204282,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" wants"}}}
-{"type":"assistant/chunk","seq":8,"time":1783352204283,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
-{"type":"assistant/chunk","seq":9,"time":1783352204283,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
-{"type":"assistant/chunk","seq":10,"time":1783352204283,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
-{"type":"assistant/chunk","seq":11,"time":1783352204283,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
-{"type":"assistant/chunk","seq":12,"time":1783352204284,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" the"}}}
-{"type":"assistant/chunk","seq":13,"time":1783352204317,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" single"}}}
-{"type":"assistant/chunk","seq":14,"time":1783352204318,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" word"}}}
-{"type":"assistant/chunk","seq":15,"time":1783352204318,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
-{"type":"assistant/chunk","seq":16,"time":1783352204318,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"FIR"}}}
-{"type":"assistant/chunk","seq":17,"time":1783352204318,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"ST"}}}
-{"type":"assistant/chunk","seq":18,"time":1783352204318,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"\""}}}
-{"type":"assistant/chunk","seq":19,"time":1783352204353,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" and"}}}
-{"type":"assistant/chunk","seq":20,"time":1783352204353,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":" stop"}}}
-{"type":"assistant/chunk","seq":21,"time":1783352204353,"data":{"turn":1,"step":1,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
-{"type":"assistant/chunk","seq":22,"time":1783352204353,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":23,"time":1783352204353,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"FIR"}}}
-{"type":"assistant/chunk","seq":24,"time":1783352204353,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":1,"text":"ST"}}}
-{"type":"assistant/chunk","seq":25,"time":1783352204393,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with the single word \"FIRST\" and stop."}}}}
-{"type":"assistant/chunk","seq":26,"time":1783352204393,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"FIRST"}}}}
-{"type":"assistant/chunk","seq":27,"time":1783352204393,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":2862,"outputTokens":20,"cacheReadTokens":0,"reasoningTokens":17}}}}
-{"type":"assistant/chunk","seq":28,"time":1783352204393,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":29,"time":1783352204396,"data":{"turn":1,"step":1,"content":[{"type":"reasoning","text":"The user wants me to reply with the single word \"FIRST\" and stop."},{"type":"text","text":"FIRST"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":2862,"outputTokens":20,"cacheReadTokens":0,"reasoningTokens":17}},"sourceEventSeqs":[4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28],"surfaceOp":"append"}
-{"type":"step/end","seq":30,"time":1783352204396,"data":{"turn":1,"step":1}}
-{"type":"hook/invoked","seq":31,"time":1783352204396,"data":{"turn":1,"point":"Stop","dialect":"claude","handlerId":"claude:Stop:1"}}
-{"type":"hook/result","seq":32,"time":1783352204443,"data":{"turn":1,"point":"Stop","handlerId":"claude:Stop:1","decision":"block","exitCode":2,"stderrSummary":"Also reply with the single word SECOND, then stop.","durationMs":47.01462700000047}}
-{"type":"steering/message","seq":33,"time":1783352204444,"data":{"turn":1,"content":[{"type":"text","text":"Also reply with the single word SECOND, then stop."}],"source":{"kind":"plugin","plugin":"hooks-claude"}},"surfaceOp":"append"}
-{"type":"step/start","seq":34,"time":1783352204444,"data":{"turn":1,"step":2}}
-{"type":"assistant/chunk","seq":35,"time":1783352204945,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
-{"type":"assistant/chunk","seq":36,"time":1783352204946,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
-{"type":"assistant/chunk","seq":37,"time":1783352205054,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
-{"type":"assistant/chunk","seq":38,"time":1783352205086,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" wants"}}}
-{"type":"assistant/chunk","seq":39,"time":1783352205087,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
-{"type":"assistant/chunk","seq":40,"time":1783352205087,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
-{"type":"assistant/chunk","seq":41,"time":1783352205087,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
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-{"type":"assistant/chunk","seq":43,"time":1783352205115,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
-{"type":"assistant/chunk","seq":44,"time":1783352205116,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"FIR"}}}
-{"type":"assistant/chunk","seq":45,"time":1783352205116,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"ST"}}}
-{"type":"assistant/chunk","seq":46,"time":1783352205116,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"\""}}}
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-{"type":"assistant/chunk","seq":51,"time":1783352205200,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"'s"}}}
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-{"type":"assistant/chunk","seq":53,"time":1783352205201,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" steering"}}}
-{"type":"assistant/chunk","seq":54,"time":1783352205201,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" input"}}}
-{"type":"assistant/chunk","seq":55,"time":1783352205231,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" telling"}}}
-{"type":"assistant/chunk","seq":56,"time":1783352205232,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
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-{"type":"assistant/chunk","seq":58,"time":1783352205232,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" also"}}}
-{"type":"assistant/chunk","seq":59,"time":1783352205266,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
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-{"type":"assistant/chunk","seq":61,"time":1783352205266,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
-{"type":"assistant/chunk","seq":62,"time":1783352205266,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"SEC"}}}
-{"type":"assistant/chunk","seq":63,"time":1783352205266,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"OND"}}}
-{"type":"assistant/chunk","seq":64,"time":1783352205267,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"\"."}}}
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-{"type":"assistant/chunk","seq":68,"time":1783352205319,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
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-{"type":"assistant/chunk","seq":76,"time":1783352205373,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" the"}}}
-{"type":"assistant/chunk","seq":77,"time":1783352205401,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" single"}}}
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diff --git a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.expected.jsonl b/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.expected.jsonl
index 39cf7df191..2d92b5b3e7 100644
--- a/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.expected.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-cc-stop-continue/stdout.expected.jsonl
@@ -7,8 +7,8 @@
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diff --git a/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/session.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/session.jsonl
index bba879203d..cee758076c 100644
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+{"type":"assistant/chunk","seq":35,"time":1784522154765,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
+{"type":"assistant/chunk","seq":36,"time":1784522154765,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"The"}}}
+{"type":"assistant/chunk","seq":37,"time":1784522154866,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" user"}}}
+{"type":"assistant/chunk","seq":38,"time":1784522154898,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" wants"}}}
+{"type":"assistant/chunk","seq":39,"time":1784522154898,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" me"}}}
+{"type":"assistant/chunk","seq":40,"time":1784522154898,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" to"}}}
+{"type":"assistant/chunk","seq":41,"time":1784522154898,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" reply"}}}
+{"type":"assistant/chunk","seq":42,"time":1784522154898,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" with"}}}
+{"type":"assistant/chunk","seq":43,"time":1784522154898,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" the"}}}
+{"type":"assistant/chunk","seq":44,"time":1784522154924,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" single"}}}
+{"type":"assistant/chunk","seq":45,"time":1784522154925,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" word"}}}
+{"type":"assistant/chunk","seq":46,"time":1784522154925,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" \""}}}
+{"type":"assistant/chunk","seq":47,"time":1784522154925,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"SEC"}}}
+{"type":"assistant/chunk","seq":48,"time":1784522154925,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"OND"}}}
+{"type":"assistant/chunk","seq":49,"time":1784522154925,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"\""}}}
+{"type":"assistant/chunk","seq":50,"time":1784522154950,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" and"}}}
+{"type":"assistant/chunk","seq":51,"time":1784522154951,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" then"}}}
+{"type":"assistant/chunk","seq":52,"time":1784522154951,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":" stop"}}}
+{"type":"assistant/chunk","seq":53,"time":1784522154951,"data":{"turn":1,"step":2,"chunk":{"type":"reasoning-delta","index":0,"text":"."}}}
+{"type":"assistant/chunk","seq":54,"time":1784522154951,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":1,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":55,"time":1784522154951,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"SEC"}}}
+{"type":"assistant/chunk","seq":56,"time":1784522154978,"data":{"turn":1,"step":2,"chunk":{"type":"text-delta","index":1,"text":"OND"}}}
+{"type":"assistant/chunk","seq":57,"time":1784522154980,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user wants me to reply with the single word \"SECOND\" and then stop."}}}}
+{"type":"assistant/chunk","seq":58,"time":1784522154980,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"SECOND"}}}}
+{"type":"assistant/chunk","seq":59,"time":1784522154980,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":106,"outputTokens":21,"cacheReadTokens":3456,"reasoningTokens":18}}}}
+{"type":"assistant/chunk","seq":60,"time":1784522154980,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":61,"time":1784522154981,"data":{"turn":1,"step":2,"content":[{"type":"reasoning","text":"The user wants me to reply with the single word \"SECOND\" and then stop."},{"type":"text","text":"SECOND"}],"provenance":{"provider":"deepseek","model":"deepseek-v4-flash"},"usage":{"inputTokens":106,"outputTokens":21,"cacheReadTokens":3456,"reasoningTokens":18}},"sourceEventSeqs":[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],"surfaceOp":"append"}
+{"type":"step/end","seq":62,"time":1784522154982,"data":{"turn":1,"step":2}}
+{"type":"hook/invoked","seq":63,"time":1784522154982,"data":{"turn":1,"point":"Stop","dialect":"codex","handlerId":"codex:Stop:2"}}
+{"type":"hook/result","seq":64,"time":1784522154990,"data":{"turn":1,"point":"Stop","handlerId":"codex:Stop:2","decision":"pass","exitCode":0,"durationMs":7.6766670000001795}}
+{"type":"turn/end","seq":65,"time":1784522154990,"data":{"turn":1,"reason":{"kind":"completed"}}}
diff --git a/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.expected.jsonl b/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.expected.jsonl
index 821d648791..a3e72075ed 100644
--- a/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.expected.jsonl
+++ b/examples/acp-agent/tests/snapshots/hook-codex-stop-continue/stdout.expected.jsonl
@@ -7,7 +7,6 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" with"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" only"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" single"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" word"}}}}
@@ -16,15 +15,13 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"ST"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" then"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" stop"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"FIR"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_message_chunk","content":{"type":"text","text":"ST"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"The"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" user"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" is"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" asking"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" wants"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" me"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" to"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" reply"}}}}
@@ -32,8 +29,11 @@
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" the"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" single"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" word"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" SECOND"}}}}
-{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":","}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" \""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"SEC"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"OND"}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"\""}}}}
+{"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" and"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" then"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":" stop"}}}}
 {"jsonrpc":"2.0","method":"session/update","params":{"sessionId":"{{sessionId}}","update":{"sessionUpdate":"agent_thought_chunk","content":{"type":"text","text":"."}}}}
diff --git a/packages/core/session/README.md b/packages/core/session/README.md
index a60be8da72..d164a8ffc8 100644
--- a/packages/core/session/README.md
+++ b/packages/core/session/README.md
@@ -87,7 +87,7 @@ Every `SessionEvent` carries two optional top-level fields (structural metadata)
 
 #### What the model sees
 
-The model receives projections of `user/message`, `assistant/message`, and `tool/result` surface entries verbatim. A `context/message` is a user-role message containing exactly `<context source="<source-kind>">`, its content blocks, and `</context>`; `steering/message` uses the identical `<steering source="<source-kind>">` / `</steering>` wrapper. Tool calls live inside assistant messages. Chunks, boundaries, usage, hook records, todo records, and other log-only events add no message.
+The model receives projections of `user/message`, `assistant/message`, `tool/result`, and `steering/message` surface entries verbatim. A `context/message` is a user-role message containing exactly `<context source="<source-kind>">`, its content blocks, and `</context>`. Tool calls live inside assistant messages. Chunks, boundaries, usage, hook records, todo records, and other log-only events add no message.
 
 #### Token effect
 
diff --git a/packages/core/session/src/index.ts b/packages/core/session/src/index.ts
index 16732f7903..19b78cde47 100644
--- a/packages/core/session/src/index.ts
+++ b/packages/core/session/src/index.ts
@@ -85,13 +85,11 @@ declare module 'cordis' {
  * canonical session vocabulary provider-neutral. Adapter-specific exceptions
  * belong in the adapter.
  */
-function renderTagged(tag: string, content: ContentBlock[], source: MessageSource): ContentBlock[] {
-  const open = `<${tag} source=${JSON.stringify(source.kind)}>`
-  const close = `</${tag}>`
+function renderContextEnvelope(content: ContentBlock[], source: MessageSource): ContentBlock[] {
   return [
-    { type: 'text', text: open },
+    { type: 'text', text: `<context source=${JSON.stringify(source.kind)}>` },
     ...content,
-    { type: 'text', text: close },
+    { type: 'text', text: '</context>' },
   ]
 }
 
@@ -241,7 +239,7 @@ export function renderContextContent(
   envelope: ContextEnvelope = 'context',
 ): ContentBlock[] {
   const cloned = structuredClone(content)
-  return envelope === 'raw' ? cloned : renderTagged('context', cloned, source)
+  return envelope === 'raw' ? cloned : renderContextEnvelope(cloned, source)
 }
 
 /**
@@ -531,8 +529,7 @@ export class Session {
         return { role: 'user', content: renderContextContent(content, source, envelope) }
       }
       case 'steering/message': {
-        const { content, source } = event.data
-        return { role: 'user', content: renderTagged('steering', content, source) }
+        return { role: 'user', content: event.data.content }
       }
       default:
         // A non-surface event (boundary, chunk, log-only record) projects to
diff --git a/packages/core/session/tests/session.spec.ts b/packages/core/session/tests/session.spec.ts
index 3b15157bde..93bfe132cd 100644
--- a/packages/core/session/tests/session.spec.ts
+++ b/packages/core/session/tests/session.spec.ts
@@ -48,7 +48,7 @@ describe('Session', () => {
     expect(structuredClone(turnEnd.data.reason)).toEqual({ kind: 'max-tokens' })
   })
 
-  it('renders context and steering messages as tagged synthetic user content', () => {
+  it('renders context messages tagged and steering messages as plain user content', () => {
     const session = new Session(SessionId('s2'))
     session.append('context/message', {
       content: [{ type: 'text', text: 'file changed: a.ts' }],
@@ -64,7 +64,8 @@ describe('Session', () => {
     expect(contextMessage!.role).toBe('user')
     expect(contextMessage!.content[0]).toMatchObject({ type: 'text', text: '<context source="plugin">' })
     expect(contextMessage!.content.at(-1)).toMatchObject({ type: 'text', text: '</context>' })
-    expect(steeringMessage!.content[0]).toMatchObject({ type: 'text', text: '<steering source="user">' })
+    expect(steeringMessage!.role).toBe('user')
+    expect(steeringMessage!.content).toEqual([{ type: 'text', text: 'focus on tests' }])
   })
 
   it('renders raw context without a generic envelope while preserving structured metadata', () => {
diff --git a/packages/core/session/tests/surface.spec.ts b/packages/core/session/tests/surface.spec.ts
index d239533476..3d983f1501 100644
--- a/packages/core/session/tests/surface.spec.ts
+++ b/packages/core/session/tests/surface.spec.ts
@@ -370,7 +370,7 @@ describe('deriveMessages with surface', () => {
     const messages = s.deriveMessages()
     expect(messages).toHaveLength(2)
     expect(messages[0]!.content[0]).toMatchObject({ type: 'text', text: '<context source="plugin">' })
-    expect(messages[1]!.content[0]).toMatchObject({ type: 'text', text: '<steering source="user">' })
+    expect(messages[1]!.content).toEqual([{ type: 'text', text: 'focus' }])
   })
 })
 
diff --git a/website/zh-CN/api/harness/sessions.md b/website/zh-CN/api/harness/sessions.md
index f59001009d..af43a0227c 100644
--- a/website/zh-CN/api/harness/sessions.md
+++ b/website/zh-CN/api/harness/sessions.md
@@ -7,7 +7,7 @@
 In-memory session store (`ctx.sessions`).
 Persistence is intentionally not implemented here — persistence plugins subscribe to `session/event` and flush on `session/flush` / dispose.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L577)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L574)
 
 ### ctx.sessions.create(id?, options?)
 
@@ -44,7 +44,7 @@ For an agent whose session must be torn down IN ORDER with its loop (so the loop
 
 **Returns** the live session, already entered and announced.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L606)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L603)
 
 ### ctx.sessions.prepare(id?, options?)
 
@@ -75,7 +75,7 @@ Build a session WITHOUT entering it into the store — validate the id/cwd and c
 
 **Returns** the constructed session, NOT yet in the store.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L635)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L632)
 
 ### ctx.sessions.enter(session)
 
@@ -112,7 +112,7 @@ Re-checks the id for a duplicate: `prepare` and `enter` are public cross-package
 
 **Returns** the detach disposer (publication hooks + store removal). When called from a synchronous `session/created` listener, removal and disposal wait until that creation dispatch unwinds.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L679)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L676)
 
 ### ctx.sessions.announce(session)
 
@@ -131,7 +131,7 @@ Emit `session/created` exactly once for an entered session (with the carrier ent
 
 - `session` — the entered session to announce to listeners.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L734)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L731)
 
 ### ctx.sessions.flush(session)
 
@@ -156,7 +156,7 @@ Dispatch the awaited `session/flush` durability checkpoint for `session`, with t
 
 **Returns** resolves when every flush listener has settled; after all settle, rejects with the first registered listener failure if any listener failed.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L786)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L783)
 
 ### ctx.sessions.get(id)
 
@@ -175,7 +175,7 @@ Look up a live session.
 
 **Returns** the session, or undefined when no live session has that id.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L818)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L815)
 
 ### ctx.sessions.list()
 
@@ -191,7 +191,7 @@ All live sessions, in creation order.
 
 **Returns** a fresh array; mutating it does not affect the store.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L826)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L823)
 
 ### ctx.sessions.fork(source, boundary?, childSessionId?)
 
@@ -220,4 +220,4 @@ Create a live child session from a turn-enclosed prefix of a live source. `bound
 
 **Returns** The created live child session.
 
-[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L843)
+[Source](https://github.com/deepseek-harness/deepseek-harness/blob/master/packages/core/session/src/index.ts#L840)