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fix(coding-agent): keep prompt and tool state across context handlers (#9846)

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Since 0.86 the prompt and tool declarations live in transcript system
messages, so a context handler that filters or slices messages could drop
them. After extension-driven compaction this sent requests without built-in
tools and made Codex emit raw tool-call text.

context handlers now see the conversation only. An unchanged list keeps the
transcript as is; a changed list gets the replayed prompt sections and tool
declarations as one leading system message. Handler-added system messages
are kept after it.

Add context_with_system, which runs after every context handler on the full
transcript and sends its result verbatim, for extensions that need to edit
system messages per request. Dropping the leading system message is reported
as an extension error.

closes #9789, closes #9822
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Armin Ronacher 2026-09-21 17:14:22 +02:00 • committed by GitHub
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commit aef5fc429b
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8 changed files with 347 additions and 9 deletions
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2
packages/coding-agent/CHANGELOG.md
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@ -19,6 +19,7 @@
- Added append-only model-context edits. For example, `sessionManager.appendContextEdit(entryId, null)` omits one message from future provider context without changing raw history, usage, or UI history.
- Added actionable `turn_end` and `agent_before_settle` extension boundaries. Return `{ entries: [...event.entries, draft], continue: true }` to persist structural entries in order and ensure one next provider request without changing steering or follow-up scheduling.
- Added retain-none compaction input: `sessionManager.appendCompaction(summary, null, tokensBefore)` stores the compaction's own ID as its kept boundary.
- Added the `context_with_system` extension event, which runs after `context` handlers on the full transcript including system messages and sends its result verbatim. See [`context_with_system`](docs/extensions.md#context_with_system).
- Added per-model image resize profiles through `inputLimits.images.resize` in `models.json`, applied to file attachments, image reads, and tool-result images ([#9631](https://github.com/earendil-works/pi/issues/9631)).
### Fixed
@ -27,6 +28,7 @@
- Fixed context-invisible boundary metadata and replacement edits causing newly appended or replaced input to be summarized before its first provider request.
- Fixed edited-context accounting both discarding valid assistant usage captured after the latest context edit and reusing that usage after a later compaction made it stale.
- Fixed selected error retries and final length/overflow recovery retaining abandoned model attempts in future provider context; post-run recovery omissions are now persisted without hiding raw transcript history or changing queue scheduling.
- Fixed `context` handlers that filter or slice messages dropping the prompt and tool declarations, which after extension-driven compaction left requests without built-in tools or made Codex emit raw tool-call text. Handlers no longer see system messages; Pi restores the prompt and tool state after they run. See [`context`](docs/extensions.md#context) ([#9789](https://github.com/earendil-works/pi/issues/9789), [#9822](https://github.com/earendil-works/pi/issues/9822)).
- Fixed `/bug` allowing uploads in offline mode while preserving local zip exports.
- Fixed idle prompt-cache warming rebuilding expired caches when its timer or an extension decision is delayed.
- Improved crash diagnostics with hints identifying loaded extensions that appear in the stack trace.