feat: BTW ephemeral forks + MCP mode descriptions#954
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…Mode support
Implements three connected features:
1. **Fork-while-running**: Removed the isRunning guard from the fork button
in SessionPanel, allowing users to fork sessions at any time regardless
of status. The fork captures persisted conversation history.
2. **callbackMode ("once" | "persistent")**: Added callback firing mode to
control how many times callbacks fire. "once" (new default) fires on
first completion then auto-disables. "persistent" preserves legacy
behavior. Available on spawn, create, and update MCP tools.
3. **"btw" mode on sessions.prompt**: New ephemeral fork mode that forks
the target session (even if running), sets up a one-shot callback to
the caller, and auto-archives the fork after the callback delivers.
Perfect for asking side questions without disrupting running work.
Frontend additions:
- "btw" button appears next to Send when session is running
- Placeholder text hints at btw mode when session is working
- BTW forks show orange "btw" badge instead of cyan "FORK" tag
- WorktreeCard tree shows "btw" label for ephemeral forks
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…dge cases Fixes from Codex code review of PR #953: **Critical**: btw button now uses dedicated `btwForkSession` action that patches fork_origin:"btw" on the forked session, instead of calling the regular fork flow which had no btw semantics. **Backward compat**: Legacy sessions without callback_mode now default to "persistent" (not "once"), preserving existing behavior for pre-existing spawned sessions. **Edge cases**: Moved btw auto-archive and once-mode auto-disable out of queueCallbackToSession into the parent task completion handler, so they run even if the callback target session is deleted/inaccessible. **DRY**: Merged fork and btw mode handlers into a single code path in the MCP sessions.prompt tool, with conditional btw-specific patch. **Modeling**: Simplified fork_origin type to just "btw" (undefined for regular forks). Added "btw_completed" archived_reason for auto-archived ephemeral forks. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Inject system message into parent session when btw fork completes, showing the question (blockquote) and response as markdown - Include caller session info for remote btw (MCP), hidden for local - BTW button always visible with ? icon, consistent button styling - FileUploadButton matches other toolbar buttons (remove type="text") Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
agor_sessions_promptmode descriptions: Clarified what each mode is for — btw is for quick side questions (status checks, summaries, fixes), not restricted to read-only.Test plan
agor_sessions_promptwithmode: "btw"on a Claude session worksagor_sessions_promptwithmode: "btw"on a Codex session returns capability error🤖 Generated with Claude Code