Add cross-provider thread takeover - #1600
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Add SDK handoff adapters and `bb thread handoff` so agents can move a thread to another provider or model through the same server-owned takeover path.
Replace the old compose shortcut with a Bring in another model drawer that creates a replacement thread through the server-owned handoff path and shows truthful takeover status on the new thread.
The new mutation wrote query cache directly and imported query keys, which the app cache-owner boundary tests reject. Seed replacement status through a dedicated owner instead.
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Post-rebase verification update. The takeover mutation was writing React Query cache directly. The full app suite caught that ( Fresh evidence on this tip:
Still needed before merge: reviewer approval, plus two live canaries on a running build of this branch (Codex → Claude Code and back).
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davekilleen
marked this pull request as ready for review
August 14, 2026 09:21
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Summary
BB threads are stuck on one provider. This change lets a user or agent move an existing thread to another provider/model in one action.
Take over creates a replacement thread in the same workspace, opens it immediately, and archives the old thread only after the new one has actually started. If startup fails, the original thread stays live.
The same server operation powers the app, SDK, and CLI.
How to try it
Agent surface:
Not in this PR
Verification
Re-run on the rebased tip (
c3097ad0a):timeline-in-turn-window), then 21/21 passed isolated. No timeline files in this diff. Protocol version unchanged at 119.c3097ad0a. Focused takeover + cache-owner tests: 9/9. Earlier focused drawer/banner/query set: 34/34.Still outstanding before merge:
Test plan
bb thread handoff --self --provider … --model … --jsonfrom an agent thread.