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feat(session): add TodoItem + todo/write event vocabulary

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Add the TodoItem type and a todo/write SessionEventMap variant carrying the
whole todo list as a snapshot (last-write-wins on replay). It is NOT a
SurfaceEventType: it produces no LLM message and never reaches
deriveMessages(), so it carries no surfaceOp and stays off the surface — it is
durable, replayable UI state that rides the existing session/event emit.

Tests cover the snapshot-clone-on-append contract, last-write-wins, the
not-on-surface guarantee, and a seeded replay round-trip. Docs: session.md
gains the TodoItem type-equiv block + the event member; core.md's variant count
goes to twelve; the type-equiv manifest gains TodoItem.
This commit is contained in:
Tianyi Cui
2026-06-29 01:39:25 +08:00
parent 185c09d6a5
commit 22a89847ac
5 changed files with 126 additions and 2 deletions
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docs/core-data-structures/core.md
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@@ -214,7 +214,7 @@ type SessionEvent<T extends SessionEventType = SessionEventType> = {
}[T]
```
The eleven event variants (`turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `context/message`, `assistant/chunk`, `assistant/message`, `tool/call`, `tool/result`, `steering/message`), the `deriveMessages()` projection rules, the `TurnTrigger`/`TurnEndReason` reasons, and the turn-enclosure invariant are on **[session.md](session.md)**. How the log is made durable — the `SessionPersistence` seam, JSONL/SQLite backends, the `session/flush` checkpoint, crash recovery, and `SessionHeader` — is on **[persistence.md](persistence.md)**.
The twelve event variants (`turn/start`, `turn/end`, `step/start`, `step/end`, `user/message`, `context/message`, `assistant/chunk`, `assistant/message`, `tool/call`, `tool/result`, `steering/message`, `todo/write`), the `deriveMessages()` projection rules, the `TurnTrigger`/`TurnEndReason` reasons, and the turn-enclosure invariant are on **[session.md](session.md)**. How the log is made durable — the `SessionPersistence` seam, JSONL/SQLite backends, the `session/flush` checkpoint, crash recovery, and `SessionHeader` — is on **[persistence.md](persistence.md)**.
## The agent handle