Add /clear context command - #27
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📝 WalkthroughWalkthroughThis change adds a durable ChangesClear-context extension
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to The new Sequence Diagram(s)sequenceDiagram
participant WebClient
participant ClientMessages
participant ManagedRpcSession
participant SessionTranscript
participant clearContextExtension
WebClient->>ClientMessages: send /clear
ClientMessages->>ManagedRpcSession: route clear command
ManagedRpcSession->>SessionTranscript: dispatch /clear
clearContextExtension->>SessionTranscript: append clear boundary
ManagedRpcSession->>SessionTranscript: verify appended boundary
ManagedRpcSession-->>WebClient: return cleared result
Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 7
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Inline comments:
In `@extensions/web-sessions.ts`:
- Around line 148-149: Gate both the command classification at
extensions/web-sessions.ts lines 148-149 and the bridge handling at lines
1088-1095 on the same clear-context capability used by
extensions/clear-context.ts, so unrelated extension, prompt, or skill commands
named “clear” are not treated as native clears. Add a test covering an unrelated
/clear command and verifying prior messages are preserved.
In `@tests/web-history.test.ts`:
- Around line 167-193: Extend the managed raw history cache tests around
boundedRawHistorySuffix with a case containing an entry larger than
WEB_HISTORY_MAX_BYTES, then assert that the retained suffix is truncated
according to the byte limit rather than only WEB_HISTORY_MAX_ENTRIES. Ensure the
test specifically verifies the oversized entry behavior and the resulting cache
contents or length.
- Around line 251-264: Extend the test covering ManagedRpcSession.getWebHistory
so fallback occurs only for the exact unsupported get_entries rejection: add
assertions that a different CommandRejectedError and a plain Error from
getEntries propagate instead of invoking message-derived history. Keep the
existing positive fallback case and verify the getMessages path is not used for
these failures.
In `@web/client/app.tsx`:
- Line 1070: In the message handling flow around isWebClearCommand and the
corresponding clear-command check, derive one trimmed message value and use it
for both client-side classifications. Preserve the existing behavior for
untrimmed messages while ensuring whitespace-prefixed /clear requests avoid
optimistic prompt handling and run clear completion cleanup.
In `@web/history.ts`:
- Around line 158-177: Make boundedWebHistory’s projected clear-boundary summary
retain the clear-boundary signal so repeated boundedWebHistory calls preserve
positional placement and are idempotent; add a regression test for
boundedWebHistory(boundedWebHistory(input)). In
web/server/managedSessionCreate.ts lines 365-373 and 438-445, and
web/server/managedSessionRefresh.ts lines 280-284, stop passing already-bounded
getWebHistory results through another replaceRecordHistory bounding step, or
rely on the corrected idempotent projection.
In `@web/server/commandRouter.ts`:
- Around line 706-710: Update the command routing around the "clear" case to
apply the same settled-session gate used by "reload" before either managed or
external clear handling. Active Pi or subagent sessions must not execute clear
immediately; preserve queued delivery until the session is settled.
In `@web/server/managed-rpc-session.ts`:
- Around line 836-867: Update the polling loop in the clear flow to call
getEntries with the last known entry ID as its since anchor, advancing that
anchor as new entries are observed. Preserve knownEntryIds and the existing
marker detection so runtimes that ignore since and return full snapshots remain
supported, while normal polling processes only incremental entries.
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ℹ️ Review info
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Run ID: 1f4ae696-01db-409d-8bad-22cb2f15acdc
📒 Files selected for processing (31)
README.mdextensions/clear-context.tsextensions/web-sessions.tspackage.jsontests/clear-context-extension.test.tstests/web-history.test.tstests/web-prompts.test.tstests/web-server-catalog.test.tstests/web-server-cleanup-worktrees.test.tstests/web-server-managed.test.tstests/web-server-native-compaction.test.tstests/web-server-native-daemon.test.tstests/web-server-native-queue.test.tstests/web-server-native-worktrees.test.tstests/web-server-projects.test.tstests/web-server-queue-recovery.test.tstests/web-server-security.test.tstests/web-server-test-helpers.tstests/web-session-queue-coordinator.test.tstests/web-slash-command-service.test.tsweb/clear-command.tsweb/client/app.tsxweb/history.tsweb/protocol.tsweb/server/clientMessages.tsweb/server/commandRouter.tsweb/server/managed-rpc-session.tsweb/server/managedSessionCreate.tsweb/server/managedSessionRefresh.tsweb/server/session-queue-coordinator.tsweb/server/slash-command-service.ts
💤 Files with no reviewable changes (2)
- tests/web-server-projects.test.ts
- tests/web-server-test-helpers.ts
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| const commands = await this.getCommands(); | ||
| if (!commands.commands.some(isWebClearContextCommand)) | ||
| throw new Error("Pi clear context support is unavailable"); | ||
| const before = await this.getEntries(); |
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For a managed session with a large append-only archive, this argument-free getEntries() transfers and materializes the entire session before /clear is dispatched, even though history hydration is otherwise bounded and the subsequent polling is incremental. A sufficiently large archive can therefore make every clear consume substantial memory or hit the normal RPC timeout before the command is sent; obtain the current cursor without hydrating the archive, or reuse the validated history cursor/cache.
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| }); | ||
| const summary = visible.find( | ||
| (entry) => | ||
| let summary: RecordValue | undefined; |
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When a clear-boundary compaction is followed by an ordinary compaction, this projection can retain both summaries and correctly reserves the newest one initially, but native sessions then append message_end entries through appendRecordHistory(), whose trimming logic pins whichever summary reaches index zero. After enough later messages hit the entry or byte bound, the older clear summary becomes pinned and the newer summary describing the model's current context is evicted. Fresh evidence beyond the previous bounded-history reservation fix is this incremental append path; trimming must continue to reserve the newest summary.
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Summary
/clearcommand that excludes prior conversation from future model context while retaining the transcript/clearin Pi Web, including queued delivery, attachment validation, slash discovery, optimistic transcript reconciliation, and aContext cleared.completion messageTesting
bun run checkbunx biome check ...(all changed files)bun run webBuildbun test: 466 passed; 2 unrelated existing worktree replacement tests fail identically in the primary checkoutReview
Summary by CodeRabbit
New Features
/clearcommand to clear conversation context while preserving the session transcript./clearsupport across web sessions, queues, history, and command discovery.Documentation
/clearcommand and updated development launch instructions.Tests