Snapshot this.ctx.sessionManager.getSessionId() for the tan clone's local://
mapping instead of session.sessionId. The two diverge after /fresh or a
provider session override, and the Windows short-root fallback keys
%TEMP%/omp-local/<id> off the session-manager id used by the parent's
large-paste writes and '/data/workspaces/can1357__oh-my-pi__6971/.omp-session/2026-07-29T06-08-45-283Z_019fac7d-5ee3-7000-a7aa-16fe9394fdc9/local' reads, so the mismatched id left attachments
unreachable.
Diverge the mocked session id from the manager id in the regression test so
it pins the session-manager id.
Fixes#6971
(cherry picked from commit 1efcd22326d76fdb8b50c0977a836c892e80ab76)
Capture the parent artifacts directory and session ID when /tan dispatches
instead of resolving them through the mutable interactive SessionManager.
This keeps background tan '/data/workspaces/can1357__oh-my-pi__6971/.omp-session/2026-07-29T06-08-45-283Z_019fac7d-5ee3-7000-a7aa-16fe9394fdc9/local' reads pinned to the dispatching transcript
after the user switches or resumes another session.
Extend the regression test to switch the mocked interactive session before
the background job starts and assert the original local mapping is retained.
Fixes#6971
(cherry picked from commit e05db428eabd5087e4b2b4a462f47927c0628e72)
TanCommandController.start nests the tan clone at
<parent-artifacts>/Tan-<id>.jsonl, so the clone's session manager derived
its own artifacts dir and hence local root <parent-artifacts>/Tan-<id>/local.
Its sdk.createAgentSession call omitted localProtocolOptions, unlike the
task-subagent path which inherits the parent's mapping, so parent-session
'/data/workspaces/can1357__oh-my-pi__6971/.omp-session/2026-07-29T06-08-45-283Z_019fac7d-5ee3-7000-a7aa-16fe9394fdc9/local' attachments (pasted files, generated references) were unreadable.
Thread the parent session manager's localProtocolOptions into the tan clone
so local:// resolves against <parent-artifacts>/local.
Fixes#6971
(cherry picked from commit 1ded46e182fc24f9f57d8e9a907aaad58f790783)
- Added comprehensive tests for downshifting model behavior, including plan nudge injection and completion safety mechanisms.
- Verified session persistence accuracy by validating that from-disk rebuilds match the live agent state.
- Confirmed correct cache key propagation during tan commands to ensure provider caching is preserved.
- Removed obsolete reasoning slide tests.
- Clear inherited todo list state and persist empty edit at fork creation to prevent parent task reminders from affecting the tangential session.
- Re-inject the fork notice after each auto-compaction event to ensure the boundary between the parent and child session survives history summarization.
- Align the provider cache key with the parent's actual pinned key to correctly mirror cached session context.
- Update `AgentSession` to perform a full entry rewrite during tool result pruning to ensure session files match pruned state for reliable resuming and branching.
- Initialized session metadata including system prompt, task, and toolset within the controller.
- Added session initialization tracking to the clone creation flow to ensure session state visibility.
- Updated unit tests to verify that session initialization data is correctly appended when a tan is created.
- Forwarded `parentAgentId` through task and eval launch paths when spawning subagents.
- Mapped `parentAgentId` to `parentId` in `createAgentSession`.
- Passed each caller's session `getAgentId` (or `MAIN_AGENT_ID`) as the parent for spawned agents.
- Removed the streaming guard that previously rejected /tan while the parent response was still generating.
- Passed "deliverAs: \"nextTurn\"" when sending the background dispatch breadcrumb and kept "triggerTurn: false" so an in-flight turn is not steered.
- Skipped rebuilding chat messages during streaming sessions and updated tests to cover the non-blocking dispatch path.
- Added a new SessionManager.forkFrom test confirming terminal breadcrumb suppression while cloning source session history under a new parent session.
- Updated TanCommandController test fixtures with required assistant message API, provider, model, and completion metadata.
- Added `/tan` slash command registration and interactive handling.
- Added TanCommandController validation and async task scheduling for `/tan` dispatch.
- Added session cloning that suppresses breadcrumbs, copies artifacts, and handles abort cleanup.
- Added `promptCacheKey` support in Agent and inherited `providerPromptCacheKey` in session creation.
Anatoli Tsinovoy