Merge pull request #2428 from deepseek-harness/fix/run-code-description-contract

让 run_code 的模型面说明点名必填的 description 参数

.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 .agents/notes/implemented/feature/2026-06-15-code-mode.md
-2026-06-15-code-mode.md: bc019c0b9acc6d834da41ceff2b1d1930fb34027
+2026-06-15-code-mode.md: adabf80ab03bdae57bba84957cdacf648c16c2f6
-2026-06-15-code-mode.zh.md: c19562b828089b6deeb048d30a08ce8681f150da
+2026-06-15-code-mode.zh.md: 24d83b9f896a73b449852d28c3e0a376fb6ace5a

.agents/notes/implemented/feature/2026-06-15-code-mode.md

@@ -87,6 +87,8 @@ The worker runtime provides containment, not a security boundary: model code can
 
 The SDK instructs the model to write an async body in the loaded runtime's language (an erasable-TypeScript body by default; a Python `async` body under a Python runtime — see the [language-dispatch note](2026-07-31-code-mode-language-dispatch.md)), call tools through `await tools.name(args)`, catch rejected tool calls when needed, and return or log only the output that should re-enter context. Both flavors state the same contract in their own primitive: independent read-only calls MAY overlap under `Promise.all` (TypeScript) or `asyncio.gather` (Python), mutating calls run alone in submission order, and dependent work sequences with `await`. The declaration prefix can be as large as native schemas, especially in `'both'`, but remains stable for provider caching.
 
+The transport's own `description` and both SDK instruction flavors open by naming `code` and `description` as the call's two required arguments. Prose that describes the call as passing a program leaves the second argument discoverable only through the parameter schema, and a model that emits `{code}` alone loses the whole written program to an `INVALID_ARGS` rejection.
+
 ## Consequences
 
 Deployments switching to `'code'` must update any native-only `toolOrder`. Assembly listeners own the integrity of any rewritten protocol messages. Sub-dispatch starts in submission order under a bounded overlap pool, while per-call contexts retain their source, envelope, and metadata through the outer result.

.agents/notes/implemented/feature/2026-06-15-code-mode.zh.md

@@ -87,6 +87,8 @@ worker 运行时只能约束程序的运行，而不构成安全边界：模型
 
 SDK 指示模型编写一个所加载运行时语言的异步函数体（默认可擦除 TypeScript；Python 运行时下为 Python `async` 函数体——见[语言分发 note](2026-07-31-code-mode-language-dispatch.md)），通过 `await tools.name(args)` 调用工具，在需要时捕获被拒绝的工具调用，并仅 return 或 log 应重新进入上下文的输出。两种 flavor 用各自的原语陈述同一约定：相互独立的只读调用可以（MAY）在 `Promise.all`（TypeScript）或 `asyncio.gather`（Python）下重叠，有副作用的调用按提交顺序单独运行，有依赖的工作用 `await` 排序。声明前缀可能与原生 schema 一样大，尤其在 `'both'` 下，但对提供方缓存保持稳定。
 
+传输自身的 `description` 与两种 flavor 的 SDK 说明都以点名 `code` 和 `description` 这两个必填参数开头。把该调用描述成「传入一个程序」的散文会让第二个参数只能从参数 schema 中发现，而只发出 `{code}` 的模型会因 `INVALID_ARGS` 被拒，连同已写好的整个程序一起丢失。
+
 ## 后果
 
 切换到 `'code'` 的部署必须更新任何仅限 native 的 `toolOrder`。组装监听器有责任维护任何被重写的协议消息的完整性。子分发在有界的重叠池下按提交顺序启动，而每次调用的上下文会通过外层结果保留其 source、信封与元数据。

docs/tool-catalog.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 docs/tool-catalog.md
-tool-catalog.md: ea89508500ec6e73e6e56c4e5d0ac2c35897b342
+tool-catalog.md: 3d73ed1ef5346f620808e9d6b04299291ba1ed4c
-tool-catalog.zh.md: 076cc63151e3b9ee8b3828ded65df9ebf09c9430
+tool-catalog.zh.md: 90573928a24630e802d98441bc0e340baf582b23

docs/tool-catalog.md

@@ -116,7 +116,7 @@ ask_user_question pauses the tool call until the active UI provider returns a hu
 
 ### `run_code`
 
-Execute a TypeScript program against the available tools. Write the BODY of an async function (erasable syntax only; top-level `await` and `return` work) and call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.
+Execute a TypeScript program against the available tools. Takes two required arguments: `code`, the BODY of an async function (erasable syntax only; top-level `await` and `return` work), and `description`, a short summary of what the program does. Call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.
 
 ```json
 {

docs/tool-catalog.zh.md

@@ -118,7 +118,7 @@ ask_user_question 会暂停工具调用，直到当前 UI 提供方返回人类
 
 ### `run_code`
 
-针对可用工具执行 TypeScript 程序。请编写异步函数的**函数体**（仅使用可擦除语法；支持顶层 `await` 和 `return`），并根据系统提示词中的声明，以 `await tools.name(args)` 形式调用工具。只有打印或返回的内容会传回，请谨慎筛选。
+针对可用工具执行 TypeScript 程序。接受两个必填参数：`code`，即异步函数的**函数体**（仅使用可擦除语法；支持顶层 `await` 和 `return`）；以及 `description`，简要说明该程序做什么。请根据系统提示词中的声明，以 `await tools.name(args)` 形式调用工具。只有打印或返回的内容会传回，请谨慎筛选。
 
 ```json
 {

examples/acp-agent/tests/snapshots/advanced-toolchain/system-prompt.expected.md

@@ -131,7 +131,7 @@ Use subagent in the background by default. Start independent delegations togethe
 
 ## Writing code for run_code
 
-Pass `run_code` the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped). Inside the program:
+`run_code` takes two required arguments: `code` — the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped) — and `description`, a short summary of what the program does. Inside the program:
 
 - Call tools as `await tools.name(args)` — quoted access for exotic names: `tools["my-tool"](args)`. Every call resolves to the tool's typed canonical JSON value. Tool arguments must be lossless JSON.
 - A FAILED tool call rejects with `ToolCallError`, whose `toolName` identifies the failed tool and whose `message` is human-readable — `try/catch` it to handle and continue.

examples/acp-agent/tests/snapshots/advanced-toolchain/tool-schemas.expected.json

@@ -443,7 +443,7 @@
     },
     {
       "name": "run_code",
-      "description": "Execute a TypeScript program against the available tools. Write the BODY of an async function (erasable syntax only; top-level `await` and `return` work) and call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.",
+      "description": "Execute a TypeScript program against the available tools. Takes two required arguments: `code`, the BODY of an async function (erasable syntax only; top-level `await` and `return` work), and `description`, a short summary of what the program does. Call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.",
       "parameters": {
         "type": "object",
         "properties": {

examples/acp-agent/tests/snapshots/both-mode-turn/system-prompt.expected.md

@@ -25,7 +25,7 @@ Use subagent in the background by default. Start independent delegations togethe
 
 ## Writing code for run_code
 
-Pass `run_code` the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped). Inside the program:
+`run_code` takes two required arguments: `code` — the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped) — and `description`, a short summary of what the program does. Inside the program:
 
 - Call tools as `await tools.name(args)` — quoted access for exotic names: `tools["my-tool"](args)`. Every call resolves to the tool's typed canonical JSON value. Tool arguments must be lossless JSON.
 - A FAILED tool call rejects with `ToolCallError`, whose `toolName` identifies the failed tool and whose `message` is human-readable — `try/catch` it to handle and continue.

examples/acp-agent/tests/snapshots/both-mode-turn/tool-schemas.expected.json

@@ -246,7 +246,7 @@
     },
     {
       "name": "run_code",
-      "description": "Execute a TypeScript program against the available tools. Write the BODY of an async function (erasable syntax only; top-level `await` and `return` work) and call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.",
+      "description": "Execute a TypeScript program against the available tools. Takes two required arguments: `code`, the BODY of an async function (erasable syntax only; top-level `await` and `return` work), and `description`, a short summary of what the program does. Call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.",
       "parameters": {
         "type": "object",
         "properties": {

examples/acp-agent/tests/snapshots/code-mode-turn/system-prompt.expected.md

@@ -27,7 +27,7 @@ Use subagent in the background by default. Start independent delegations togethe
 
 ## Writing code for run_code
 
-Pass `run_code` the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped). Inside the program:
+`run_code` takes two required arguments: `code` — the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped) — and `description`, a short summary of what the program does. Inside the program:
 
 - Call tools as `await tools.name(args)` — quoted access for exotic names: `tools["my-tool"](args)`. Every call resolves to the tool's typed canonical JSON value. Tool arguments must be lossless JSON.
 - A FAILED tool call rejects with `ToolCallError`, whose `toolName` identifies the failed tool and whose `message` is human-readable — `try/catch` it to handle and continue.

examples/acp-agent/tests/snapshots/code-mode-turn/tool-schemas.expected.json

@@ -2,7 +2,7 @@
   "initial": [
     {
       "name": "run_code",
-      "description": "Execute a TypeScript program against the available tools. Write the BODY of an async function (erasable syntax only; top-level `await` and `return` work) and call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.",
+      "description": "Execute a TypeScript program against the available tools. Takes two required arguments: `code`, the BODY of an async function (erasable syntax only; top-level `await` and `return` work), and `description`, a short summary of what the program does. Call tools as `await tools.name(args)` per the declarations in the system prompt. Only what you print or return comes back — curate it.",
       "parameters": {
         "type": "object",
         "properties": {

examples/headless-agent/tests/snapshots/advanced-toolchain/session.1.jsonl

@@ -1,19 +1,19 @@
 {"type":"session","version":0,"id":"22222222-2222-4222-8222-222222222222","createdAt":1783950001000,"cwd":"{{cwd}}","parentSession":"11111111-1111-4111-8111-111111111111","origin":"subagent","delegationDepth":1}
-{"type":"agent/inbox/spliced","seq":0,"time":1785498583877,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"77f5992c-b7ed-4453-96de-83c51b1e8041"}]}}
+{"type":"agent/inbox/spliced","seq":0,"time":1785498583877,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"c66e310e-2597-4d01-85c8-2d70a9d831c0"}]}}
 {"type":"turn/start","seq":1,"time":1785821454445,"data":{"turn":1}}
 {"type":"agent/inbox/spliced","seq":2,"time":1785821454445,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
 {"type":"subagent/descriptor","seq":3,"time":1785821454466,"data":{"version":2,"mode":"one-shot","provider":"spawn","label":"Check direct child"}}
 {"type":"step/start","seq":4,"time":1785730501506,"data":{"turn":1,"step":1}}
-{"type":"user/message","seq":5,"time":1785730501506,"data":{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"77f5992c-b7ed-4453-96de-83c51b1e8041"},"surfaceOp":"append"}
+{"type":"user/message","seq":5,"time":1785730501506,"data":{"content":[{"type":"text","text":"Reply with exactly DIRECT_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"c66e310e-2597-4d01-85c8-2d70a9d831c0"},"surfaceOp":"append"}
-{"type":"user/message","seq":6,"time":1786373992181,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"16344357-da11-40dc-a87f-b390a2c9686d"},"surfaceOp":"append"}
+{"type":"user/message","seq":6,"time":1786373992181,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"fd0a0587-8df4-46b2-809a-317346a4c0f4"},"surfaceOp":"append"}
 {"type":"session/title","seq":7,"time":1786373992181,"data":{"title":"Reply with exactly DIRECT_CHILD_OK and","messageSeqs":[5],"source":{"kind":"fallback"}}}
-{"type":"request/header","seq":8,"time":1785498583897,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"You are an AI agent powered by DeepSeek Harness.\n\nYou are headless-agent, a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.\n\nVerify your work by running the code or tests. Keep answers brief and factual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-observation-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-observation-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\nTrack every background job id you start. You are notified in-session when a job finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running job's work. Before giving a final answer, collect every still-relevant job with job_output (set wait: true only when you are genuinely blocked on it), and job_kill jobs that stopped mattering.\n\nUse the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.\n\n# Dynamic Cordis Plugins\n\nDynamic Cordis plugins temporarily extend the current DSH process. A Plugin uses apply(ctx) to consume Services, listen to Events, provide Services, register model Tools, or register browser UI in Slots.\n\n- Plugin and Package definitions exist only in the current process. define itself does not modify repository source, configuration, or disk, and definitions do not survive a process restart.\n- The restricted execution environment prevents accidental misuse; it is not a security boundary for malicious code. Services obtained by dynamic code connect to the real runtime.\n\n## Make the user-facing plan clear first\n\n- Dynamic Cordis Plugins are one available implementation mechanism, not the default for every request. Consider whether one could help only when the user intends to design or create something, or when a temporary interface could materially aid the current work. The presence of these instructions or Tools, and discussion of Cordis itself, do not make a request a dynamic-Plugin task.\n- When Cordis is a plausible fit, infer the intended work target and lifetime from the request and conversation. Use it only when the outcome belongs to the current running harness and should be delivered as a temporary runtime extension. If that distinction is materially ambiguous, ask at most one concise question about the intended result or lifetime. Otherwise proceed with the matching workflow; do not require the user to know or choose Cordis as an implementation mechanism.\n- Once a dynamic Plugin is appropriate, decide whether the task creates a new Plugin or modifies the Plugin named by the user with @pluginId. Proceed directly when the goal is clear; do not ask for repeated confirmation.\n- Choose Host, Client, or both from the requested outcome. Do not propose a Client/browser UI when the task does not need visible page behavior, and do not avoid Client when the requested outcome is visual, interactive, or depends on page state. Host versus Client is an implementation choice; do not make the user choose it.\n- When a design direction or a potentially useful interface would materially affect the result, ask at most one concise outcome or creative-preference question and offer a few candidate directions. Otherwise proceed directly; do not conduct a multi-round interview or a complex questionnaire.\n- cordis_define only defines and presents code; it does not run it. After definition, explain the pluginId and packageId returned by the Host and whether the next step is a run or update.\n- cordis_run may require user approval. When it returns awaiting-approval, explain that the user must allow or reject it in the UI. Do not wait, retry, or claim that it is running.\n- When it returns starting, explain that the request has entered the asynchronous flow and the Client is still activating. starting does not mean success. Wait for the system to report the final result through steering context.\n- Do not request approval agaLine truncated
+{"type":"request/header","seq":8,"time":1785498583897,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"You are an AI agent powered by DeepSeek Harness.\n\nYou are headless-agent, a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.\n\nVerify your work by running the code or tests. Keep answers brief and factual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-observation-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-observation-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\nTrack every background job id you start. You are notified in-session when a job finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running job's work. Before giving a final answer, collect every still-relevant job with job_output (set wait: true only when you are genuinely blocked on it), and job_kill jobs that stopped mattering.\n\nUse the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.\n\n# Dynamic Cordis Plugins\n\nDynamic Cordis plugins temporarily extend the current DSH process. A Plugin uses apply(ctx) to consume Services, listen to Events, provide Services, register model Tools, or register browser UI in Slots.\n\n- Plugin and Package definitions exist only in the current process. define itself does not modify repository source, configuration, or disk, and definitions do not survive a process restart.\n- The restricted execution environment prevents accidental misuse; it is not a security boundary for malicious code. Services obtained by dynamic code connect to the real runtime.\n\n## Make the user-facing plan clear first\n\n- Dynamic Cordis Plugins are one available implementation mechanism, not the default for every request. Consider whether one could help only when the user intends to design or create something, or when a temporary interface could materially aid the current work. The presence of these instructions or Tools, and discussion of Cordis itself, do not make a request a dynamic-Plugin task.\n- When Cordis is a plausible fit, infer the intended work target and lifetime from the request and conversation. Use it only when the outcome belongs to the current running harness and should be delivered as a temporary runtime extension. If that distinction is materially ambiguous, ask at most one concise question about the intended result or lifetime. Otherwise proceed with the matching workflow; do not require the user to know or choose Cordis as an implementation mechanism.\n- Once a dynamic Plugin is appropriate, decide whether the task creates a new Plugin or modifies the Plugin named by the user with @pluginId. Proceed directly when the goal is clear; do not ask for repeated confirmation.\n- Choose Host, Client, or both from the requested outcome. Do not propose a Client/browser UI when the task does not need visible page behavior, and do not avoid Client when the requested outcome is visual, interactive, or depends on page state. Host versus Client is an implementation choice; do not make the user choose it.\n- When a design direction or a potentially useful interface would materially affect the result, ask at most one concise outcome or creative-preference question and offer a few candidate directions. Otherwise proceed directly; do not conduct a multi-round interview or a complex questionnaire.\n- cordis_define only defines and presents code; it does not run it. After definition, explain the pluginId and packageId returned by the Host and whether the next step is a run or update.\n- cordis_run may require user approval. When it returns awaiting-approval, explain that the user must allow or reject it in the UI. Do not wait, retry, or claim that it is running.\n- When it returns starting, explain that the request has entered the asynchronous flow and the Client is still activating. starting does not mean success. Wait for the system to report the final result through steering context.\n- Do not request approval agaLine truncated
 {"type":"request/context","seq":9,"time":1785730501507,"data":{"provider":"deepseek-official","model":"deepseek-v4-flash"}}
 {"type":"assistant/chunk","seq":10,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
 {"type":"assistant/chunk","seq":11,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"text-delta","index":0,"text":"DIRECT_CHILD_OK"}}}
 {"type":"assistant/chunk","seq":12,"time":1783957884564,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"DIRECT_CHILD_OK"}}}}
 {"type":"assistant/chunk","seq":13,"time":1785498583897,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":14,"time":1785730501507,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":15,"time":1785730501507,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"DIRECT_CHILD_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"ce699f54-ef07-41e3-86e9-ef57995549f0"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[10,11,12,13,14],"surfaceOp":"append"}
+{"type":"assistant/message","seq":15,"time":1785730501507,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"DIRECT_CHILD_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"02dd8a61-a39a-46d0-8f6f-457533271cae"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[10,11,12,13,14],"surfaceOp":"append"}
 {"type":"step/end","seq":16,"time":1785730501507,"data":{"turn":1,"step":1}}
 {"type":"turn/end","seq":17,"time":1785730501507,"data":{"turn":1,"reason":{"kind":"completed"}}}

examples/headless-agent/tests/snapshots/advanced-toolchain/session.2.jsonl

@@ -1,19 +1,19 @@
 {"type":"session","version":0,"id":"33333333-3333-4333-8333-333333333333","createdAt":1783950002000,"cwd":"{{cwd}}","parentSession":"11111111-1111-4111-8111-111111111111","origin":"subagent","delegationDepth":1}
-{"type":"agent/inbox/spliced","seq":0,"time":1785498584048,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Reply with exactly WORKFLOW_CHILD_OK and nothing else."}],"source":{"kind":"user"},"role":"user","id":"893169a9-49fc-4849-96ce-18bd7132f2e3"}]}}
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 {"type":"turn/start","seq":1,"time":1785821454599,"data":{"turn":1}}
 {"type":"agent/inbox/spliced","seq":2,"time":1785821454599,"data":{"target":"next-turn","start":0,"removedCount":1,"inserted":[]}}
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 {"type":"step/start","seq":4,"time":1785730501645,"data":{"turn":1,"step":1}}
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-{"type":"user/message","seq":6,"time":1786373992411,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"61a17dbb-19d2-4053-8251-ff867a552522"},"surfaceOp":"append"}
+{"type":"user/message","seq":6,"time":1786373992411,"data":{"content":[{"type":"text","text":"Current runtime context. This snapshot supersedes earlier runtime-context snapshots.\n\nYou are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}],"source":{"kind":"plugin","plugin":"@deepseek-ai/dsh-system-prompt","form":"snapshot","sections":[{"name":"subagent:delegation","text":"You are a delegated subagent: your permission scope was fixed when you were started and cannot be widened from inside this session — operations that require approval are rejected automatically. When the task needs access beyond that scope, do not retry the denied operation; state the limitation in your reply so the delegating agent can handle it."}]},"role":"user","id":"823e5037-9e96-4ef5-8c5b-cbe73b993ee2"},"surfaceOp":"append"}
 {"type":"session/title","seq":7,"time":1786373992411,"data":{"title":"Reply with exactly WORKFLOW_CHILD_OK and","messageSeqs":[5],"source":{"kind":"fallback"}}}
-{"type":"request/header","seq":8,"time":1785498584067,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"You are an AI agent powered by DeepSeek Harness.\n\nYou are headless-agent, a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.\n\nVerify your work by running the code or tests. Keep answers brief and factual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-observation-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-observation-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\nTrack every background job id you start. You are notified in-session when a job finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running job's work. Before giving a final answer, collect every still-relevant job with job_output (set wait: true only when you are genuinely blocked on it), and job_kill jobs that stopped mattering.\n\nUse the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.\n\n# Dynamic Cordis Plugins\n\nDynamic Cordis plugins temporarily extend the current DSH process. A Plugin uses apply(ctx) to consume Services, listen to Events, provide Services, register model Tools, or register browser UI in Slots.\n\n- Plugin and Package definitions exist only in the current process. define itself does not modify repository source, configuration, or disk, and definitions do not survive a process restart.\n- The restricted execution environment prevents accidental misuse; it is not a security boundary for malicious code. Services obtained by dynamic code connect to the real runtime.\n\n## Make the user-facing plan clear first\n\n- Dynamic Cordis Plugins are one available implementation mechanism, not the default for every request. Consider whether one could help only when the user intends to design or create something, or when a temporary interface could materially aid the current work. The presence of these instructions or Tools, and discussion of Cordis itself, do not make a request a dynamic-Plugin task.\n- When Cordis is a plausible fit, infer the intended work target and lifetime from the request and conversation. Use it only when the outcome belongs to the current running harness and should be delivered as a temporary runtime extension. If that distinction is materially ambiguous, ask at most one concise question about the intended result or lifetime. Otherwise proceed with the matching workflow; do not require the user to know or choose Cordis as an implementation mechanism.\n- Once a dynamic Plugin is appropriate, decide whether the task creates a new Plugin or modifies the Plugin named by the user with @pluginId. Proceed directly when the goal is clear; do not ask for repeated confirmation.\n- Choose Host, Client, or both from the requested outcome. Do not propose a Client/browser UI when the task does not need visible page behavior, and do not avoid Client when the requested outcome is visual, interactive, or depends on page state. Host versus Client is an implementation choice; do not make the user choose it.\n- When a design direction or a potentially useful interface would materially affect the result, ask at most one concise outcome or creative-preference question and offer a few candidate directions. Otherwise proceed directly; do not conduct a multi-round interview or a complex questionnaire.\n- cordis_define only defines and presents code; it does not run it. After definition, explain the pluginId and packageId returned by the Host and whether the next step is a run or update.\n- cordis_run may require user approval. When it returns awaiting-approval, explain that the user must allow or reject it in the UI. Do not wait, retry, or claim that it is running.\n- When it returns starting, explain that the request has entered the asynchronous flow and the Client is still activating. starting does not mean success. Wait for the system to report the final result through steering context.\n- Do not request approval agaLine truncated
+{"type":"request/header","seq":8,"time":1785498584067,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"You are an AI agent powered by DeepSeek Harness.\n\nYou are headless-agent, a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.\n\nVerify your work by running the code or tests. Keep answers brief and factual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-observation-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-observation-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\nTrack every background job id you start. You are notified in-session when a job finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running job's work. Before giving a final answer, collect every still-relevant job with job_output (set wait: true only when you are genuinely blocked on it), and job_kill jobs that stopped mattering.\n\nUse the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.\n\n# Dynamic Cordis Plugins\n\nDynamic Cordis plugins temporarily extend the current DSH process. A Plugin uses apply(ctx) to consume Services, listen to Events, provide Services, register model Tools, or register browser UI in Slots.\n\n- Plugin and Package definitions exist only in the current process. define itself does not modify repository source, configuration, or disk, and definitions do not survive a process restart.\n- The restricted execution environment prevents accidental misuse; it is not a security boundary for malicious code. Services obtained by dynamic code connect to the real runtime.\n\n## Make the user-facing plan clear first\n\n- Dynamic Cordis Plugins are one available implementation mechanism, not the default for every request. Consider whether one could help only when the user intends to design or create something, or when a temporary interface could materially aid the current work. The presence of these instructions or Tools, and discussion of Cordis itself, do not make a request a dynamic-Plugin task.\n- When Cordis is a plausible fit, infer the intended work target and lifetime from the request and conversation. Use it only when the outcome belongs to the current running harness and should be delivered as a temporary runtime extension. If that distinction is materially ambiguous, ask at most one concise question about the intended result or lifetime. Otherwise proceed with the matching workflow; do not require the user to know or choose Cordis as an implementation mechanism.\n- Once a dynamic Plugin is appropriate, decide whether the task creates a new Plugin or modifies the Plugin named by the user with @pluginId. Proceed directly when the goal is clear; do not ask for repeated confirmation.\n- Choose Host, Client, or both from the requested outcome. Do not propose a Client/browser UI when the task does not need visible page behavior, and do not avoid Client when the requested outcome is visual, interactive, or depends on page state. Host versus Client is an implementation choice; do not make the user choose it.\n- When a design direction or a potentially useful interface would materially affect the result, ask at most one concise outcome or creative-preference question and offer a few candidate directions. Otherwise proceed directly; do not conduct a multi-round interview or a complex questionnaire.\n- cordis_define only defines and presents code; it does not run it. After definition, explain the pluginId and packageId returned by the Host and whether the next step is a run or update.\n- cordis_run may require user approval. When it returns awaiting-approval, explain that the user must allow or reject it in the UI. Do not wait, retry, or claim that it is running.\n- When it returns starting, explain that the request has entered the asynchronous flow and the Client is still activating. starting does not mean success. Wait for the system to report the final result through steering context.\n- Do not request approval agaLine truncated
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examples/headless-agent/tests/snapshots/advanced-toolchain/session.jsonl

@@ -1,20 +1,20 @@
 {"type":"session","version":0,"id":"11111111-1111-4111-8111-111111111111","createdAt":1783950000000,"cwd":"{{cwd}}","delegationDepth":0}
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+{"type":"agent/inbox/spliced","seq":0,"time":1785498583746,"data":{"target":"next-turn","start":0,"inserted":[{"content":[{"type":"text","text":"Run this advanced flow exactly once: define a host-only dynamic Cordis Package named Snapshot Marker; run and inspect snap-1/pkg-1 through run_code; delegate once to a direct spawn child; run one workflow that delegates to another spawn child; remove snap-1; then reply with exactly ADVANCED_HEADLESS_OK."}],"source":{"kind":"user"},"role":"user","id":"8a0ac233-283c-4eb4-8bbd-5c50b7e99afe"}]}}
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-{"type":"user/message","seq":4,"time":1785498583779,"data":{"content":[{"type":"text","text":"Run this advanced flow exactly once: define a host-only dynamic Cordis Package named Snapshot Marker; run and inspect snap-1/pkg-1 through run_code; delegate once to a direct spawn child; run one workflow that delegates to another spawn child; remove snap-1; then reply with exactly ADVANCED_HEADLESS_OK."}],"source":{"kind":"user"},"role":"user","id":"eeafe3ec-26b4-4e44-ae07-96422e3691ac"},"surfaceOp":"append"}
+{"type":"user/message","seq":4,"time":1785498583779,"data":{"content":[{"type":"text","text":"Run this advanced flow exactly once: define a host-only dynamic Cordis Package named Snapshot Marker; run and inspect snap-1/pkg-1 through run_code; delegate once to a direct spawn child; run one workflow that delegates to another spawn child; remove snap-1; then reply with exactly ADVANCED_HEADLESS_OK."}],"source":{"kind":"user"},"role":"user","id":"8a0ac233-283c-4eb4-8bbd-5c50b7e99afe"},"surfaceOp":"append"}
 {"type":"session/title","seq":5,"time":1785498583779,"data":{"title":"Run this advanced flow exactly","messageSeqs":[4],"source":{"kind":"fallback"}}}
-{"type":"request/header","seq":6,"time":1785498583782,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"You are an AI agent powered by DeepSeek Harness.\n\nYou are headless-agent, a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.\n\nVerify your work by running the code or tests. Keep answers brief and factual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-observation-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-observation-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\nTrack every background job id you start. You are notified in-session when a job finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running job's work. Before giving a final answer, collect every still-relevant job with job_output (set wait: true only when you are genuinely blocked on it), and job_kill jobs that stopped mattering.\n\nUse the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.\n\n# Dynamic Cordis Plugins\n\nDynamic Cordis plugins temporarily extend the current DSH process. A Plugin uses apply(ctx) to consume Services, listen to Events, provide Services, register model Tools, or register browser UI in Slots.\n\n- Plugin and Package definitions exist only in the current process. define itself does not modify repository source, configuration, or disk, and definitions do not survive a process restart.\n- The restricted execution environment prevents accidental misuse; it is not a security boundary for malicious code. Services obtained by dynamic code connect to the real runtime.\n\n## Make the user-facing plan clear first\n\n- Dynamic Cordis Plugins are one available implementation mechanism, not the default for every request. Consider whether one could help only when the user intends to design or create something, or when a temporary interface could materially aid the current work. The presence of these instructions or Tools, and discussion of Cordis itself, do not make a request a dynamic-Plugin task.\n- When Cordis is a plausible fit, infer the intended work target and lifetime from the request and conversation. Use it only when the outcome belongs to the current running harness and should be delivered as a temporary runtime extension. If that distinction is materially ambiguous, ask at most one concise question about the intended result or lifetime. Otherwise proceed with the matching workflow; do not require the user to know or choose Cordis as an implementation mechanism.\n- Once a dynamic Plugin is appropriate, decide whether the task creates a new Plugin or modifies the Plugin named by the user with @pluginId. Proceed directly when the goal is clear; do not ask for repeated confirmation.\n- Choose Host, Client, or both from the requested outcome. Do not propose a Client/browser UI when the task does not need visible page behavior, and do not avoid Client when the requested outcome is visual, interactive, or depends on page state. Host versus Client is an implementation choice; do not make the user choose it.\n- When a design direction or a potentially useful interface would materially affect the result, ask at most one concise outcome or creative-preference question and offer a few candidate directions. Otherwise proceed directly; do not conduct a multi-round interview or a complex questionnaire.\n- cordis_define only defines and presents code; it does not run it. After definition, explain the pluginId and packageId returned by the Host and whether the next step is a run or update.\n- cordis_run may require user approval. When it returns awaiting-approval, explain that the user must allow or reject it in the UI. Do not wait, retry, or claim that it is running.\n- When it returns starting, explain that the request has entered the asynchronous flow and the Client is still activating. starting does not mean success. Wait for the system to report the final result through steering context.\n- Do not request approval agaLine truncated
+{"type":"request/header","seq":6,"time":1785498583782,"data":{"header":{"config":{"provider":"deepseek-official","model":"deepseek-v4-flash"},"system":"You are an AI agent powered by DeepSeek Harness.\n\nYou are headless-agent, a coding assistant powered by the deepseek-v4-flash model. Your working directory is {{cwd}}.\n\nVerify your work by running the code or tests. Keep answers brief and factual.\n\n\nUse the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.\n\nUse the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-observation-policy requires it) and prefer edit for targeted changes.\n\nUse the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-observation-policy requires it), unless you just created or edited it in this session.\n\nCheck the [exit code: N] marker on every bash result; investigate failures before moving on.\n\nTrack every background job id you start. You are notified in-session when a job finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running job's work. Before giving a final answer, collect every still-relevant job with job_output (set wait: true only when you are genuinely blocked on it), and job_kill jobs that stopped mattering.\n\nUse the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.\n\n# Dynamic Cordis Plugins\n\nDynamic Cordis plugins temporarily extend the current DSH process. A Plugin uses apply(ctx) to consume Services, listen to Events, provide Services, register model Tools, or register browser UI in Slots.\n\n- Plugin and Package definitions exist only in the current process. define itself does not modify repository source, configuration, or disk, and definitions do not survive a process restart.\n- The restricted execution environment prevents accidental misuse; it is not a security boundary for malicious code. Services obtained by dynamic code connect to the real runtime.\n\n## Make the user-facing plan clear first\n\n- Dynamic Cordis Plugins are one available implementation mechanism, not the default for every request. Consider whether one could help only when the user intends to design or create something, or when a temporary interface could materially aid the current work. The presence of these instructions or Tools, and discussion of Cordis itself, do not make a request a dynamic-Plugin task.\n- When Cordis is a plausible fit, infer the intended work target and lifetime from the request and conversation. Use it only when the outcome belongs to the current running harness and should be delivered as a temporary runtime extension. If that distinction is materially ambiguous, ask at most one concise question about the intended result or lifetime. Otherwise proceed with the matching workflow; do not require the user to know or choose Cordis as an implementation mechanism.\n- Once a dynamic Plugin is appropriate, decide whether the task creates a new Plugin or modifies the Plugin named by the user with @pluginId. Proceed directly when the goal is clear; do not ask for repeated confirmation.\n- Choose Host, Client, or both from the requested outcome. Do not propose a Client/browser UI when the task does not need visible page behavior, and do not avoid Client when the requested outcome is visual, interactive, or depends on page state. Host versus Client is an implementation choice; do not make the user choose it.\n- When a design direction or a potentially useful interface would materially affect the result, ask at most one concise outcome or creative-preference question and offer a few candidate directions. Otherwise proceed directly; do not conduct a multi-round interview or a complex questionnaire.\n- cordis_define only defines and presents code; it does not run it. After definition, explain the pluginId and packageId returned by the Host and whether the next step is a run or update.\n- cordis_run may require user approval. When it returns awaiting-approval, explain that the user must allow or reject it in the UI. Do not wait, retry, or claim that it is running.\n- When it returns starting, explain that the request has entered the asynchronous flow and the Client is still activating. starting does not mean success. Wait for the system to report the final result through steering context.\n- Do not request approval agaLine truncated
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-{"type":"tool/result","seq":15,"time":1785730501413,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"advanced-define"},"content":[{"type":"tool-result","toolCallId":"advanced-define","content":[{"type":"text","text":"Defined snap-1/pkg-1 (Snapshot Marker); it is not running yet. Use cordis_run to activate this Package."}],"isError":false}],"role":"user","id":"8255947c-3d5d-4872-8359-914555595bd3"},"meta":{"pluginId":"snap-1","packageId":"pkg-1"}},"sourceEventSeqs":[14],"surfaceOp":"append"}
+{"type":"tool/result","seq":15,"time":1785730501413,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"advanced-define"},"content":[{"type":"tool-result","toolCallId":"advanced-define","content":[{"type":"text","text":"Defined snap-1/pkg-1 (Snapshot Marker); it is not running yet. Use cordis_run to activate this Package."}],"isError":false}],"role":"user","id":"9fd9ba62-1b6d-4bb7-98c6-97815e983026"},"meta":{"pluginId":"snap-1","packageId":"pkg-1"}},"sourceEventSeqs":[14],"surfaceOp":"append"}
 {"type":"step/end","seq":16,"time":1785730501413,"data":{"turn":1,"step":1}}
 {"type":"step/start","seq":17,"time":1785730501423,"data":{"turn":1,"step":2}}
 {"type":"assistant/chunk","seq":18,"time":1783950000017,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -22,13 +22,13 @@
 {"type":"assistant/chunk","seq":20,"time":1783950000019,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-code","name":"run_code","arguments":"{\"code\":\"const run = await tools.cordis_run({ pluginId: 'snap-1', packageId: 'pkg-1', mode: 'run' });\\nconst inspected = await tools.cordis_inspect_self({ pluginId: 'snap-1' });\\nreturn { run, inspected };\",\"description\":\"Run and inspect the dynamic Cordis Package\"}"}}}}
 {"type":"assistant/chunk","seq":21,"time":1785498583804,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":22,"time":1785730501424,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":23,"time":1785730501424,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-code","name":"run_code","arguments":"{\"code\":\"const run = await tools.cordis_run({ pluginId: 'snap-1', packageId: 'pkg-1', mode: 'run' });\\nconst inspected = await tools.cordis_inspect_self({ pluginId: 'snap-1' });\\nreturn { run, inspected };\",\"description\":\"Run and inspect the dynamic Cordis Package\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"e73246e2-257d-4d38-a8cd-5e5f713d4ad3"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[18,19,20,21,22],"surfaceOp":"append"}
+{"type":"assistant/message","seq":23,"time":1785730501424,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-code","name":"run_code","arguments":"{\"code\":\"const run = await tools.cordis_run({ pluginId: 'snap-1', packageId: 'pkg-1', mode: 'run' });\\nconst inspected = await tools.cordis_inspect_self({ pluginId: 'snap-1' });\\nreturn { run, inspected };\",\"description\":\"Run and inspect the dynamic Cordis Package\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"6f6c3cc3-350b-4afb-a3d1-8f91b9494628"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[18,19,20,21,22],"surfaceOp":"append"}
 {"type":"tool/call","seq":24,"time":1785730501424,"data":{"turn":1,"step":2,"callId":"advanced-code","name":"run_code","arguments":"{\"code\":\"const run = await tools.cordis_run({ pluginId: 'snap-1', packageId: 'pkg-1', mode: 'run' });\\nconst inspected = await tools.cordis_inspect_self({ pluginId: 'snap-1' });\\nreturn { run, inspected };\",\"description\":\"Run and inspect the dynamic Cordis Package\"}"}}
 {"type":"tool/code-dispatch-start","seq":25,"time":1785730501473,"data":{"rootCallId":"advanced-code","parentCallId":"advanced-code","subCallId":"advanced-code:code:1","name":"cordis_run","arguments":{"pluginId":"snap-1","packageId":"pkg-1","mode":"run"}}}
 {"type":"tool/code-dispatch","seq":26,"time":1785730501474,"data":{"rootCallId":"advanced-code","parentCallId":"advanced-code","subCallId":"advanced-code:code:1","name":"cordis_run","arguments":{"pluginId":"snap-1","packageId":"pkg-1","mode":"run"},"isError":false,"content":[{"type":"text","text":"snap-1/pkg-1 is running (run-1)."}]}}
 {"type":"tool/code-dispatch-start","seq":27,"time":1786558903189,"data":{"rootCallId":"advanced-code","parentCallId":"advanced-code","subCallId":"advanced-code:code:2","name":"cordis_inspect_self","arguments":{"pluginId":"snap-1"}}}
 {"type":"tool/code-dispatch","seq":28,"time":1786558903189,"data":{"rootCallId":"advanced-code","parentCallId":"advanced-code","subCallId":"advanced-code:code:2","name":"cordis_inspect_self","arguments":{"pluginId":"snap-1"},"isError":false,"content":[{"type":"text","text":"{\n  \"mode\": \"plugin\",\n  \"pluginId\": \"snap-1\",\n  \"name\": \"Snapshot Marker\",\n  \"packageCount\": 1,\n  \"state\": \"running\",\n  \"currentPackageId\": \"pkg-1\",\n  \"activeRun\": {\n    \"pluginRunId\": \"run-1\",\n    \"packageId\": \"pkg-1\"\n  },\n  \"packages\": [\n    {\n      \"packageId\": \"pkg-1\",\n      \"name\": \"Snapshot Marker\",\n      \"purpose\": \"Exercise the dynamic Cordis Package lifecycle in the snapshot.\",\n      \"hasHostHalf\": true,\n      \"hasClientHalf\": false,\n      \"isCurrent\": true,\n      \"isNext\": false\n    }\n  ]\n}"}]}}
-{"type":"tool/result","seq":29,"time":1786558903193,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"advanced-code"},"content":[{"type":"tool-result","toolCallId":"advanced-code","content":[{"type":"text","text":"{\n  \"run\": {\n    \"status\": \"running\",\n    \"pluginId\": \"snap-1\",\n    \"packageId\": \"pkg-1\",\n    \"pluginRunId\": \"run-1\",\n    \"currentPackageId\": \"pkg-1\",\n    \"host\": {\n      \"status\": \"running\",\n      \"provides\": [],\n      \"waitingFor\": []\n    },\n    \"client\": {\n      \"status\": \"absent\",\n      \"waitingFor\": []\n    }\n  },\n  \"inspected\": {\n    \"mode\": \"plugin\",\n    \"pluginId\": \"snap-1\",\n    \"name\": \"Snapshot Marker\",\n    \"packageCount\": 1,\n    \"state\": \"running\",\n    \"currentPackageId\": \"pkg-1\",\n    \"activeRun\": {\n      \"pluginRunId\": \"run-1\",\n      \"packageId\": \"pkg-1\"\n    },\n    \"packages\": [\n      {\n        \"packageId\": \"pkg-1\",\n        \"name\": \"Snapshot Marker\",\n        \"purpose\": \"Exercise the dynamic Cordis Package lifecycle in the snapshot.\",\n        \"hasHostHalf\": true,\n        \"hasClientHalf\": false,\n        \"isCurrent\": true,\n        \"isNext\": false\n      }\n    ]\n  }\n}"}],"isError":false}],"role":"user","id":"acb0a833-2535-41ff-9e1d-926c092329b6"}},"sourceEventSeqs":[24],"surfaceOp":"append"}
+{"type":"tool/result","seq":29,"time":1786558903193,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"advanced-code"},"content":[{"type":"tool-result","toolCallId":"advanced-code","content":[{"type":"text","text":"{\n  \"run\": {\n    \"status\": \"running\",\n    \"pluginId\": \"snap-1\",\n    \"packageId\": \"pkg-1\",\n    \"pluginRunId\": \"run-1\",\n    \"currentPackageId\": \"pkg-1\",\n    \"host\": {\n      \"status\": \"running\",\n      \"provides\": [],\n      \"waitingFor\": []\n    },\n    \"client\": {\n      \"status\": \"absent\",\n      \"waitingFor\": []\n    }\n  },\n  \"inspected\": {\n    \"mode\": \"plugin\",\n    \"pluginId\": \"snap-1\",\n    \"name\": \"Snapshot Marker\",\n    \"packageCount\": 1,\n    \"state\": \"running\",\n    \"currentPackageId\": \"pkg-1\",\n    \"activeRun\": {\n      \"pluginRunId\": \"run-1\",\n      \"packageId\": \"pkg-1\"\n    },\n    \"packages\": [\n      {\n        \"packageId\": \"pkg-1\",\n        \"name\": \"Snapshot Marker\",\n        \"purpose\": \"Exercise the dynamic Cordis Package lifecycle in the snapshot.\",\n        \"hasHostHalf\": true,\n        \"hasClientHalf\": false,\n        \"isCurrent\": true,\n        \"isNext\": false\n      }\n    ]\n  }\n}"}],"isError":false}],"role":"user","id":"40a17cbf-a853-4813-bbb5-7970cfbc7010"}},"sourceEventSeqs":[24],"surfaceOp":"append"}
 {"type":"step/end","seq":30,"time":1786558903193,"data":{"turn":1,"step":2}}
 {"type":"step/start","seq":31,"time":1786558903203,"data":{"turn":1,"step":3}}
 {"type":"assistant/chunk","seq":32,"time":1785037378923,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -36,9 +36,9 @@
 {"type":"assistant/chunk","seq":34,"time":1785730501484,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\",\"run_in_background\":false}"}}}}
 {"type":"assistant/chunk","seq":35,"time":1786558903204,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":36,"time":1786558903204,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":37,"time":1786558903204,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\",\"run_in_background\":false}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"32da94eb-ef97-4929-8dec-dea761506e90"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[32,33,34,35,36],"surfaceOp":"append"}
+{"type":"assistant/message","seq":37,"time":1786558903204,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\",\"run_in_background\":false}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"8bdea090-4a9a-451f-bb21-459af50472fa"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[32,33,34,35,36],"surfaceOp":"append"}
 {"type":"tool/call","seq":38,"time":1786558903205,"data":{"turn":1,"step":3,"callId":"advanced-direct-child","name":"subagent","arguments":"{\"description\":\"Check direct child\",\"prompt\":\"Reply with exactly DIRECT_CHILD_OK and nothing else.\",\"run_in_background\":false}"}}
-{"type":"tool/result","seq":39,"time":1786558903240,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"advanced-direct-child"},"content":[{"type":"tool-result","toolCallId":"advanced-direct-child","content":[{"type":"text","text":"DIRECT_CHILD_OK"}],"isError":false}],"role":"user","id":"29fcc9e2-dee3-4bf7-b3a9-e167c00a755b"}},"sourceEventSeqs":[38],"surfaceOp":"append"}
+{"type":"tool/result","seq":39,"time":1786558903240,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"advanced-direct-child"},"content":[{"type":"tool-result","toolCallId":"advanced-direct-child","content":[{"type":"text","text":"DIRECT_CHILD_OK"}],"isError":false}],"role":"user","id":"c978c208-8ebd-4dd6-b997-606ca7de787e"}},"sourceEventSeqs":[38],"surfaceOp":"append"}
 {"type":"step/end","seq":40,"time":1786558903240,"data":{"turn":1,"step":3}}
 {"type":"step/start","seq":41,"time":1786558903249,"data":{"turn":1,"step":4}}
 {"type":"assistant/chunk","seq":42,"time":1785037378946,"data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -46,13 +46,13 @@
 {"type":"assistant/chunk","seq":44,"time":1785730501522,"data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-headless-snapshot\",\"description\":\"exercise one workflow child through the headless agent\"}}"}}}}
 {"type":"assistant/chunk","seq":45,"time":1786558903250,"data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":46,"time":1786558903250,"data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":47,"time":1786558903250,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-headless-snapshot\",\"description\":\"exercise one workflow child through the headless agent\"}}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"6fff1bc7-3e35-415b-ae02-e018d360fe09"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[42,43,44,45,46],"surfaceOp":"append"}
+{"type":"assistant/message","seq":47,"time":1786558903250,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-headless-snapshot\",\"description\":\"exercise one workflow child through the headless agent\"}}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"e55b2b2e-497c-45d2-8115-16f317ae573f"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[42,43,44,45,46],"surfaceOp":"append"}
 {"type":"tool/call","seq":48,"time":1786558903250,"data":{"turn":1,"step":4,"callId":"advanced-workflow","name":"workflow","arguments":"{\"script\":\"phase('Delegate')\\nconst reply = await agent('Reply with exactly WORKFLOW_CHILD_OK and nothing else.', { label: 'workflow-child' })\\nreturn { reply }\",\"meta\":{\"name\":\"advanced-headless-snapshot\",\"description\":\"exercise one workflow child through the headless agent\"}}"}}
 {"type":"tool-workflow/run-start","seq":49,"time":1786558903255,"data":{"runId":"cd3d2666-94a1-4285-804e-c99630bc7b51","name":"advanced-headless-snapshot"}}
 {"type":"tool-workflow/agent-start","seq":50,"time":1786558903485,"data":{"runId":"cd3d2666-94a1-4285-804e-c99630bc7b51","seq":1,"label":"workflow-child","phase":"Delegate","childId":"33333333-3333-4333-8333-333333333333"}}
 {"type":"tool-workflow/agent-end","seq":51,"time":1786558903518,"data":{"runId":"cd3d2666-94a1-4285-804e-c99630bc7b51","seq":1,"outcome":"completed"}}
 {"type":"tool-workflow/run-end","seq":52,"time":1786558903521,"data":{"runId":"cd3d2666-94a1-4285-804e-c99630bc7b51","stopReason":"completed"}}
-{"type":"tool/result","seq":53,"time":1786558903521,"data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"advanced-workflow"},"content":[{"type":"tool-result","toolCallId":"advanced-workflow","content":[{"type":"text","text":"workflow \"advanced-headless-snapshot\" completed (1 agent).\nReturn value:\n{\n  \"reply\": \"WORKFLOW_CHILD_OK\"\n}"}],"isError":false}],"role":"user","id":"82895074-35a8-470a-a622-b951d2fc2665"}},"sourceEventSeqs":[48],"surfaceOp":"append"}
+{"type":"tool/result","seq":53,"time":1786558903521,"data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"advanced-workflow"},"content":[{"type":"tool-result","toolCallId":"advanced-workflow","content":[{"type":"text","text":"workflow \"advanced-headless-snapshot\" completed (1 agent).\nReturn value:\n{\n  \"reply\": \"WORKFLOW_CHILD_OK\"\n}"}],"isError":false}],"role":"user","id":"f85f58fc-8d7e-4c9f-a0fe-caff480a9fec"}},"sourceEventSeqs":[48],"surfaceOp":"append"}
 {"type":"step/end","seq":54,"time":1786558903521,"data":{"turn":1,"step":4}}
 {"type":"step/start","seq":55,"time":1786558903530,"data":{"turn":1,"step":5}}
 {"type":"assistant/chunk","seq":56,"time":1786359174239,"data":{"turn":1,"step":5,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
@@ -60,9 +60,9 @@
 {"type":"assistant/chunk","seq":58,"time":1786359174239,"data":{"turn":1,"step":5,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"advanced-undefine","name":"cordis_undefine","arguments":"{\"pluginId\":\"snap-1\"}"}}}}
 {"type":"assistant/chunk","seq":59,"time":1786558903530,"data":{"turn":1,"step":5,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":60,"time":1786558903530,"data":{"turn":1,"step":5,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":61,"time":1786558903530,"data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-undefine","name":"cordis_undefine","arguments":"{\"pluginId\":\"snap-1\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"b1219ecf-66a4-4de1-b822-a39b6651bd90"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[56,57,58,59,60],"surfaceOp":"append"}
+{"type":"assistant/message","seq":61,"time":1786558903530,"data":{"turn":1,"step":5,"message":{"role":"assistant","content":[{"type":"tool-call","id":"advanced-undefine","name":"cordis_undefine","arguments":"{\"pluginId\":\"snap-1\"}"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"68bd993f-a0bd-4ea8-ad16-6b1a19e09bd3"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[56,57,58,59,60],"surfaceOp":"append"}
 {"type":"tool/call","seq":62,"time":1786558903531,"data":{"turn":1,"step":5,"callId":"advanced-undefine","name":"cordis_undefine","arguments":"{\"pluginId\":\"snap-1\"}"}}
-{"type":"tool/result","seq":63,"time":1786558903537,"data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"advanced-undefine"},"content":[{"type":"tool-result","toolCallId":"advanced-undefine","content":[{"type":"text","text":"Removed dynamic Plugin snap-1 and all of its Packages."}],"isError":false}],"role":"user","id":"30c8e3bb-2ada-4576-9764-6e87f5b8fc94"}},"sourceEventSeqs":[62],"surfaceOp":"append"}
+{"type":"tool/result","seq":63,"time":1786558903537,"data":{"turn":1,"step":5,"message":{"source":{"kind":"tool","callId":"advanced-undefine"},"content":[{"type":"tool-result","toolCallId":"advanced-undefine","content":[{"type":"text","text":"Removed dynamic Plugin snap-1 and all of its Packages."}],"isError":false}],"role":"user","id":"2d90e3b5-2a4c-4408-a1a0-3d009786a07b"}},"sourceEventSeqs":[62],"surfaceOp":"append"}
 {"type":"step/end","seq":64,"time":1786558903537,"data":{"turn":1,"step":5}}
 {"type":"step/start","seq":65,"time":1786558903547,"data":{"turn":1,"step":6}}
 {"type":"assistant/chunk","seq":66,"time":1786359174249,"data":{"turn":1,"step":6,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
@@ -70,6 +70,6 @@
 {"type":"assistant/chunk","seq":68,"time":1786359174249,"data":{"turn":1,"step":6,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"ADVANCED_HEADLESS_OK"}}}}
 {"type":"assistant/chunk","seq":69,"time":1786558903548,"data":{"turn":1,"step":6,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}
 {"type":"assistant/chunk","seq":70,"time":1786558903548,"data":{"turn":1,"step":6,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":71,"time":1786558903548,"data":{"turn":1,"step":6,"message":{"role":"assistant","content":[{"type":"text","text":"ADVANCED_HEADLESS_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"9b46dd3a-e3ea-4f25-a246-814f31826e9e"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[66,67,68,69,70],"surfaceOp":"append"}
+{"type":"assistant/message","seq":71,"time":1786558903548,"data":{"turn":1,"step":6,"message":{"role":"assistant","content":[{"type":"text","text":"ADVANCED_HEADLESS_OK"}],"source":{"kind":"model","provider":"deepseek-official","model":"deepseek-v4-flash"},"id":"f3823367-2e25-43d2-a129-70dc492b2a90"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[66,67,68,69,70],"surfaceOp":"append"}
 {"type":"step/end","seq":72,"time":1786558903549,"data":{"turn":1,"step":6}}
 {"type":"turn/end","seq":73,"time":1786558903549,"data":{"turn":1,"reason":{"kind":"completed"}}}

packages/core/tools/README.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 packages/core/tools/README.md
-README.md: 120931c9f4b4f5e1c39c3ddd8da4b8cae42dbe69
+README.md: 60841513ad5ad439ae8851dffc34e8d250acaa67
-README.zh.md: 7a8ca63a607d2fdc841382ace3f7adcbfd721d76
+README.zh.md: ba2947337285ec5bba3a124cfeb4f105ad623877

packages/core/tools/README.md

@@ -155,7 +155,7 @@ Code Mode exposes the generated [`run_code` schema](../../../docs/tool-catalog.m
 ```markdown
 ## Writing code for run_code
 
-Pass `run_code` the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped). Inside the program:
+`run_code` takes two required arguments: `code` — the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped) — and `description`, a short summary of what the program does. Inside the program:
 
 - Call tools as `await tools.name(args)` — quoted access for exotic names: `tools["my-tool"](args)`. Every call resolves to the tool's typed canonical JSON value. Tool arguments must be lossless JSON.
 - A FAILED tool call rejects with `ToolCallError`, whose `toolName` identifies the failed tool and whose `message` is human-readable — `try/catch` it to handle and continue.

packages/core/tools/README.zh.md

@@ -155,7 +155,7 @@ Code Mode 会公开生成的 [`run_code` schema](../../../docs/tool-catalog.md#d
 ```markdown
 ## Writing code for run_code
 
-Pass `run_code` the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped). Inside the program:
+`run_code` takes two required arguments: `code` — the body of an async TypeScript function (erasable syntax only — no `enum` or namespaces; type annotations are advisory, the code runs type-stripped) — and `description`, a short summary of what the program does. Inside the program:
 
 - Call tools as `await tools.name(args)` — quoted access for exotic names: `tools["my-tool"](args)`. Every call resolves to the tool's typed canonical JSON value. Tool arguments must be lossless JSON.
 - A FAILED tool call rejects with `ToolCallError`, whose `toolName` identifies the failed tool and whose `message` is human-readable — `try/catch` it to handle and continue.

packages/core/tools/src/code-mode.ts

@@ -45,10 +45,11 @@ interface RunCodeFlavor {
  */
 const TYPESCRIPT_FLAVOR: RunCodeFlavor = {
   description:
-    'Execute a TypeScript program against the available tools. Write the BODY of an '
+    'Execute a TypeScript program against the available tools. Takes two required '
-    + 'async function (erasable syntax only; top-level `await` and `return` work) and '
+    + 'arguments: `code`, the BODY of an async function (erasable syntax only; top-level '
-    + 'call tools as `await tools.name(args)` per the declarations in the system prompt. '
+    + '`await` and `return` work), and `description`, a short summary of what the program '
-    + 'Only what you print or return comes back — curate it.',
+    + 'does. Call tools as `await tools.name(args)` per the declarations in the system '
+    + 'prompt. Only what you print or return comes back — curate it.',
   codeDescription: 'The program: the body of an async TypeScript function.',
 }
 
@@ -59,8 +60,9 @@ const TYPESCRIPT_FLAVOR: RunCodeFlavor = {
  */
 const PYTHON_FLAVOR: RunCodeFlavor = {
   description:
-    'Execute a Python program against the available tools. Write the BODY of an '
+    'Execute a Python program against the available tools. Takes two required '
-    + 'async function (top-level `await` and `return` work) and call tools as '
+    + 'arguments: `code`, the BODY of an async function (top-level `await` and `return` '
+    + 'work), and `description`, a short summary of what the program does. Call tools as '
     + '`await tools.name(args)` per the declarations in the system prompt. Answer '
     + 'with `print(...)` and/or `return <value>` — only that comes back, so curate it.',
   codeDescription: 'The program: the body of an async Python function.',

packages/core/tools/src/py-types.ts

@@ -733,7 +733,7 @@ export function jsonSchemaToPy(schema: unknown): string {
 /** The fixed model-facing usage contract rendered above the declarations. */
 const SDK_INSTRUCTIONS = `## Writing code for run_code
 
-Pass \`run_code\` the body of an async Python function (top-level \`await\` and \`return\` both work). At run time exactly two of the names declared below are bound: \`tools\` and \`ToolCallError\`. Everything else is a STATIC STUB describing argument and return types — in particular the \`TypedDict\` classes do NOT exist at run time, so build arguments as plain \`dict\`/\`list\` JSON values: \`await tools.name({"field": 1})\`, never \`FooArgs(field=1)\`, which raises \`NameError\`. Inside the program:
+\`run_code\` takes two required arguments: \`code\` — the body of an async Python function (top-level \`await\` and \`return\` both work) — and \`description\`, a short summary of what the program does. At run time exactly two of the names declared below are bound: \`tools\` and \`ToolCallError\`. Everything else is a STATIC STUB describing argument and return types — in particular the \`TypedDict\` classes do NOT exist at run time, so build arguments as plain \`dict\`/\`list\` JSON values: \`await tools.name({"field": 1})\`, never \`FooArgs(field=1)\`, which raises \`NameError\`. Inside the program:
 
 - Call tools as \`await tools.name(args)\` — subscript access for exotic, reserved, or underscore-leading names: \`await tools["my-tool"](args)\`. Every call resolves to the tool's typed canonical JSON value (each method's return type below). Tool arguments must be lossless JSON.
 - A FAILED tool call raises \`ToolCallError\`, whose \`toolName\` identifies the failed tool and whose message is human-readable — wrap in \`try/except\` to handle and continue.

packages/core/tools/src/ts-types.ts

@@ -249,7 +249,7 @@ export function jsonSchemaToTs(schema: unknown, indent = 0): string {
 /** The fixed model-facing usage contract rendered above the declarations (see the Code Mode Agent Note's "What the model sees"). */
 const SDK_INSTRUCTIONS = `## Writing code for run_code
 
-Pass \`run_code\` the body of an async TypeScript function (erasable syntax only — no \`enum\` or namespaces; type annotations are advisory, the code runs type-stripped). Inside the program:
+\`run_code\` takes two required arguments: \`code\` — the body of an async TypeScript function (erasable syntax only — no \`enum\` or namespaces; type annotations are advisory, the code runs type-stripped) — and \`description\`, a short summary of what the program does. Inside the program:
 
 - Call tools as \`await tools.name(args)\` — quoted access for exotic names: \`tools["my-tool"](args)\`. Every call resolves to the tool's typed canonical JSON value. Tool arguments must be lossless JSON.
 - A FAILED tool call rejects with \`ToolCallError\`, whose \`toolName\` identifies the failed tool and whose \`message\` is human-readable — \`try/catch\` it to handle and continue.

packages/core/tools/tests/code-mode.spec.ts

@@ -399,6 +399,10 @@ describe('mode-aware wire contribution', () => {
     const runCodeSchema = assembly.tools.find(tool => tool.name === RUN_CODE_NAME)
     expect(runCodeSchema?.description).toContain('Execute a TypeScript program')
     expect(runCodeSchema?.description).toContain('BODY of an')
+    // Both required arguments are named here, not only in the parameter
+    // schema: prose that describes the call as "pass the program" is what
+    // leads a model to emit `{code}` alone and fail INVALID_ARGS.
+    expect(runCodeSchema?.description).toContain('`description`')
     const codeParam = (runCodeSchema?.parameters as { properties: { code: { description: string } } }).properties.code
     expect(codeParam.description).toBe('The program: the body of an async TypeScript function.')
   })
@@ -410,6 +414,7 @@ describe('mode-aware wire contribution', () => {
     const runCodeSchema = assembly.tools.find(tool => tool.name === RUN_CODE_NAME)
     expect(runCodeSchema?.description).toContain('Execute a Python program')
     expect(runCodeSchema?.description).toContain('`return <value>`')
+    expect(runCodeSchema?.description).toContain('`description`')
     expect(runCodeSchema?.description).not.toContain('TypeScript')
     const codeParam = (runCodeSchema?.parameters as { properties: { code: { description: string } } }).properties.code
     expect(codeParam.description).toBe('The program: the body of an async Python function.')

packages/core/tools/tests/py-types.spec.ts

@@ -166,6 +166,15 @@ describe('renderToolsSdkPy', () => {
     expect(text).toContain('tools: Tools')
   })
 
+  it('names both required call arguments, not just the program', () => {
+    // The schema requires `code` AND `description`; instructions that mention
+    // only the program let a model emit `{code}` alone and fail INVALID_ARGS.
+    const text = renderToolsSdkPy([bash])
+    expect(text).toContain('`code`')
+    expect(text).toContain('`description`')
+    expect(text).toContain('two required arguments')
+  })
+
   it('renders required as plain fields and optional as NotRequired, with per-field description comments', () => {
     const tool: ToolSdkSchema = {
       name: 'search',

packages/core/tools/tests/ts-types.spec.ts

@@ -148,6 +148,15 @@ describe('renderToolsSdk', () => {
     expect(text).toContain('lossless JSON')
   })
 
+  it('names both required call arguments, not just the program', () => {
+    // The schema requires `code` AND `description`; instructions that mention
+    // only the program let a model emit `{code}` alone and fail INVALID_ARGS.
+    const text = renderToolsSdk([bash])
+    expect(text).toContain('`code`')
+    expect(text).toContain('`description`')
+    expect(text).toContain('two required arguments')
+  })
+
   it('is deterministic: same tool set, byte-identical text regardless of input order', () => {
     expect(renderToolsSdk([bash, exotic])).toBe(renderToolsSdk([exotic, bash]))
     // Equal names sort stably (the comparator's equal arm).