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feat(web): list background tasks in the session header

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The task registry has run every background bash, pwsh, pty-send, and
one-shot subagent since it landed, but only the model could read it: a
human at the Web client could not see that a build was running, tell a
finished task from a stuck one, or find its outcome anywhere but the
`run_in_background` tool card that printed an id and never updated.

Task state now reaches the browser as one whole-snapshot `session/tasks`
mux frame per session, pushed at every registry commit that changes what
that session can see. `TaskService` gains `onTasksChanged`, which is
owner-granular because owner-disposal removal is a change no per-task
record can express. The carrier reads the exact owner the listener hands
it, so a push stays correct while that scope tears down, and reads the
baseline through the non-resuming `ctx.agents.get` so listing never
revives a cold session. The client keeps a last-wins mirror on
`SessionListState`, and a new `dsh-client-ui-task` package renders it
beside the subagent catalog — rendering nothing at all until the session
has a task, so an ordinary conversation grows no new chrome.

Streamed per-task output and human-initiated cancellation are separate
phases; the note records why neither has to undo this channel, and why
no Web path may call the consuming `ctx.tasks.read()`.
This commit is contained in:
Yichen Jiang
2026-08-08 23:29:41 +08:00
parent 22609ea425
commit eab0aeb9db
93 changed files with 2130 additions and 68 deletions
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13
packages/host/apiproxy/tests/rpc-schemas.spec.ts
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@@ -433,6 +433,11 @@ describe('events frame schemas', () => {
},
] },
{ type: 'session/projection', sessionId: 's', key: 'todos', value: [{ content: 'x', status: 'pending' }], seq: 7 },
{ type: 'session/tasks', sessionId: 's', tasks: [] },
{ type: 'session/tasks', sessionId: 's', tasks: [
{ id: 'bash-1', kind: 'bash', label: 'pnpm run build', status: 'running', startedAt: 5 },
{ id: 'pty-send-2', kind: 'pty-send', label: 'send keys', status: 'failed', detail: 'exit code: 3', startedAt: 5, finishedAt: 9 },
] },
{ type: 'stream/error', error: { code: 'internal', message: 'm', details: {} } },
]
for (const frame of frames) expect(muxFrameSchema.parse(frame)).toMatchObject({ type: frame.type })
@@ -441,6 +446,14 @@ describe('events frame schemas', () => {
{ type: 'session/projection', sessionId: 's', key: '', value: null, seq: 0 },
{ type: 'session/projection', sessionId: 's', key: 'todos', value: null, seq: -1 },
{ type: 'session/projection', sessionId: 's', key: 'todos', value: null, seq: 0.5 },
// A producer kind stays an open string, but the closed status set and
// the identity/label bounds are the carrier's own wire contract.
{ type: 'session/tasks', sessionId: 's', tasks: [{ id: '', kind: 'bash', label: 'l', status: 'running', startedAt: 0 }] },
{ type: 'session/tasks', sessionId: 's', tasks: [{ id: 'bash-1', kind: '', label: 'l', status: 'running', startedAt: 0 }] },
{ type: 'session/tasks', sessionId: 's', tasks: [{ id: 'bash-1', kind: 'bash', label: '', status: 'running', startedAt: 0 }] },
{ type: 'session/tasks', sessionId: 's', tasks: [{ id: 'bash-1', kind: 'bash', label: 'l', status: 'pending', startedAt: 0 }] },
{ type: 'session/tasks', sessionId: 's', tasks: [{ id: 'bash-1', kind: 'bash', label: 'l', status: 'running', startedAt: -1 }] },
{ type: 'session/tasks', sessionId: 's', tasks: [{ id: 'bash-1', kind: 'bash', label: 'l', status: 'completed', startedAt: 0, finishedAt: 0.5 }] },
]) expect(() => muxFrameSchema.parse(invalid)).toThrow()
expect(askUserQuestionItemSchema.parse({ id: 'q', question: 'Q?' }).id).toBe('q')
})