feat(tasks): background task runtime, generic task_* control tools, bash/subagent producers
One shared ctx.tasks registry (branded <kind>-N ids, owner-fenced read/kill/wait/list, attachSurface misconfiguration fence, reported-flag notice dedup, atomic register) + dsh-tool-tasks (task_output/task_list/ task_kill, completion-notice injection, background prompt habit). Producers opt in via their own enableRunInBackground config: bash (stream kind; seam slimmed to resolve/run/start returning a BashProcess handle, bash_output/bash_kill deleted) and subagent (final-output kind; done settles after run.dispose()). Owner disposal drains tasks through the new awaited ctx.agents.onCleanup seam in the loop's disposal chain. Both RFCs moved to implemented/; docs, catalogs, snapshots re-pinned.
This commit is contained in:
Yichen Jiang
@@ -15,9 +15,10 @@ This table connects model-visible tool names to the plugin package and service s
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| Tool package | Model-visible names | Requires | Writes / affects | Shipped aliases | Deployment note |
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| --- | --- | --- | --- | --- | --- |
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| `@deepseek-ai/dsh-tool-bash` | `bash`, `bash_kill`, `bash_output` | `ctx.tools`, `ctx.bash` | `tool/call`, `tool/result`, `context/message via agent.inject() for background completion notices` | - | The bash/bash_output/bash_kill tools are model-facing consumers of the bash executor seam. |
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| `@deepseek-ai/dsh-tool-bash` | `bash` | `ctx.tools`, `ctx.bash`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled. |
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| `@deepseek-ai/dsh-tool-fs` | `edit`, `read`, `write` | `ctx.tools`, `ctx.fs`, `ctx.systemPrompt` | `tool/call`, `fs/write-intent or fs/edit-intent for mutations`, `fs/observed after successful file operations`, `tool/result` | - | The read-before-write/edit policy is added by `@deepseek-ai/dsh-fs-policy` (an `fs/*` event-gate plugin, no schema change); a deployment that loads these tools is expected to also load it. The tool schemas above are identical with or without the policy plugin. |
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| `@deepseek-ai/dsh-tool-subagent` | `subagent` | `ctx.tools`, `ctx.subagents` | `tool/call`, `tool/result`, `child session events through the chosen provider` | `subagent`, `subagent_fork` | The registered tool name is the load-time `toolName` config (default `subagent`); the schema above is that default. The shipped example agents load this package once per subagent backend, so the model additionally sees `subagent_fork` (bound to the fork backend) with an identical schema — see `examples/coding-agent/cordis.yml` and `examples/acp-agent/cordis.yml`. |
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| `@deepseek-ai/dsh-tool-tasks` | `task_kill`, `task_list`, `task_output` | `ctx.tools`, `ctx.tasks`, `ctx.systemPrompt` | `tool/call`, `tool/result`, `context/message via agent.inject() for background completion notices` | - | The kind-agnostic background-task control surface: a background bash command and a background subagent are read, listed, and killed through the same three tools. Loading the plugin attaches the control surface that arms producers' `ctx.tasks.register()`. |
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| `@deepseek-ai/dsh-tool-todo` | `todo_write` | `ctx.tools`, `owning Agent session` | `tool/call`, `todo/write`, `tool/result` | - | todo_write is session-owned state; UIs render the latest todo/write event as a checklist or ACP plan. |
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| `@deepseek-ai/dsh-tool-web` | `web_fetch`, `web_search` | `ctx.tools`, `ctx.web`, `ctx.systemPrompt` | `tool/call`, `tool/result` | - | web_search and web_fetch keep provider selection behind ctx.web so model-visible schemas stay stable across backend swaps. |
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@@ -25,7 +26,7 @@ This table connects model-visible tool names to the plugin package and service s
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### `bash`
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Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; poll it with `bash_output` and stop it with `bash_kill`.
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Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; read its output with `task_output` and stop it with `task_kill`.
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```json
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{
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@@ -49,7 +50,7 @@ Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs
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},
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"run_in_background": {
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"type": "boolean",
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"description": "Run in the background and return a task id immediately. No timeout applies."
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"description": "Run in the background and return a task id immediately (collect with task_output, stop with task_kill). No timeout applies."
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}
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},
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"required": [
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@@ -61,49 +62,7 @@ Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs
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Source: [`packages/bash/tool-bash/src/index.ts`](../packages/bash/tool-bash/src/index.ts)
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### `bash_kill`
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Ask the executor to kill a running background bash task by task id.
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```json
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{
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"type": "object",
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"properties": {
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"task_id": {
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"type": "string",
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"description": "Task id returned by the bash tool."
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}
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},
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"required": [
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"task_id"
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]
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}
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```
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Source: [`packages/bash/tool-bash/src/index.ts`](../packages/bash/tool-bash/src/index.ts)
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### `bash_output`
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Read new output from a background bash task started with `bash` + `run_in_background`. Returns only output produced since the previous bash_output call, plus the task status. Tasks keep running while you do other work; poll again later for more output.
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```json
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{
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"type": "object",
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"properties": {
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"task_id": {
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"type": "string",
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"description": "Task id returned by the bash tool."
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}
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},
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"required": [
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"task_id"
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]
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}
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```
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Source: [`packages/bash/tool-bash/src/index.ts`](../packages/bash/tool-bash/src/index.ts)
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The bash/bash_output/bash_kill tools are model-facing consumers of the bash executor seam.
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The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled.
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## `@deepseek-ai/dsh-tool-fs`
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@@ -203,7 +162,7 @@ The read-before-write/edit policy is added by `@deepseek-ai/dsh-fs-policy` (an `
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### `subagent`
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Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation.
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Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation. Set `run_in_background: true` to get a task id immediately and keep working; collect the final answer with `task_output` (wait: true when you are blocked on it) and stop it with `task_kill`.
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```json
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{
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@@ -216,6 +175,10 @@ Delegate a self-contained task to a subagent (a separate agent that works in its
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"prompt": {
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"type": "string",
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"description": "The complete, self-contained task for the subagent. It does not share this conversation's context, so include everything it needs."
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},
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"run_in_background": {
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"type": "boolean",
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"description": "Run the subagent as a background task and return a task id immediately (collect with task_output, stop with task_kill)."
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}
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},
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"required": [
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@@ -229,6 +192,77 @@ Source: [`packages/subagent/tool-subagent/src/index.ts`](../packages/subagent/to
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The registered tool name is the load-time `toolName` config (default `subagent`); the schema above is that default. The shipped example agents load this package once per subagent backend, so the model additionally sees `subagent_fork` (bound to the fork backend) with an identical schema — see `examples/coding-agent/cordis.yml` and `examples/acp-agent/cordis.yml`.
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## `@deepseek-ai/dsh-tool-tasks`
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### `task_kill`
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Request cancellation of a running background task by task id. Returns immediately; the task settles as killed once its work actually stops.
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```json
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{
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"type": "object",
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"properties": {
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"task_id": {
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"type": "string",
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"description": "Task id returned by the tool that started the background work."
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},
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"reason": {
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"type": "string",
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"description": "Optional short reason, recorded in the log and forwarded to the task."
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}
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},
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"required": [
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"task_id"
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]
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}
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```
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Source: [`packages/tasks/tool-tasks/src/index.ts`](../packages/tasks/tool-tasks/src/index.ts)
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### `task_list`
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List your background tasks (running and finished) with their ids, kinds, and statuses.
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```json
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{
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"type": "object",
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"properties": {}
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}
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```
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Source: [`packages/tasks/tool-tasks/src/index.ts`](../packages/tasks/tool-tasks/src/index.ts)
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### `task_output`
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Read output/status from a background task (started by a tool with `run_in_background`). Stream tasks (bash) return only output produced since your previous task_output call; final-output tasks (subagent) return the final answer once the task finishes. Every response ends with a [status: ...] line. Non-blocking by default; set `wait: true` to block until the task finishes (bounded by a capped timeout) when you are genuinely blocked on its result.
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```json
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{
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"type": "object",
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"properties": {
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"task_id": {
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"type": "string",
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"description": "Task id returned by the tool that started the background work."
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},
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"wait": {
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"type": "boolean",
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"description": "Block until the task reaches a terminal status or the timeout expires. A timed-out wait returns [status: running] and leaves the task alive."
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},
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"timeout_ms": {
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"type": "number",
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"description": "Max wait in milliseconds (only meaningful with wait: true). Defaults to the configured wait timeout; capped by the configured maximum."
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}
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},
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"required": [
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"task_id"
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]
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}
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```
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Source: [`packages/tasks/tool-tasks/src/index.ts`](../packages/tasks/tool-tasks/src/index.ts)
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The kind-agnostic background-task control surface: a background bash command and a background subagent are read, listed, and killed through the same three tools. Loading the plugin attaches the control surface that arms producers' `ctx.tasks.register()`.
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## `@deepseek-ai/dsh-tool-todo`
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### `todo_write`
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