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fix: keep fork boundary check simple

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Hypatia May
2026-07-06 14:17:31 +08:00
parent 37aac7f313
commit 71f71816b9
6 changed files with 19 additions and 84 deletions
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docs/core-data-structures/session.md
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@@ -163,9 +163,9 @@ Everything else (`turn/*`, `step/*`) is structural and does not project into a m
`ctx.sessions.create(id, { seed, meta })` is the low-level replay/fork primitive. For ordinary live-session forks, `SessionStore` exposes one policy API:
- `fork({ source, boundary?, childSessionId? })` accepts a live `Session` object or live `SessionId`, selects source events through the inclusive `boundary` seq (default: current last event), validates that selected prefix is turn-enclosed and empty or ends at `turn/end`, then creates a live child session with deep-cloned seed events plus child metadata (`parentSession`, `seedLength`, and inherited `cwd`).
- `fork({ source, boundary?, childSessionId? })` accepts a live `Session` object or live `SessionId`, selects source events through the inclusive `boundary` seq (default: current last event), requires the boundary event to be `turn/end`, then creates a live child session with deep-cloned seed events plus child metadata (`parentSession`, `seedLength`, and inherited `cwd`).
An explicit `boundary` lets callers fork from a previous completed turn even if the source has newer events or an open current turn. The API rejects open or malformed selected prefixes instead of clipping silently. `dsh-subagent-fork` keeps its completed-prefix clipping because tool-time delegation usually starts while the parent turn is open; ordinary session branching should make the requested boundary explicit.
An explicit `boundary` lets callers fork from a previous completed turn even if the source has newer events or an open current turn. The API rejects non-`turn/end` boundaries instead of clipping silently. Broader turn-enclosure sanity stays in the existing `dsh-invariants` plugin and persistence repair path rather than being duplicated in `fork()`. `dsh-subagent-fork` keeps its completed-prefix clipping because tool-time delegation usually starts while the parent turn is open; ordinary session branching should make the requested boundary explicit.
## What started a turn: `TurnTriggerMap`