Mirror Claude Code's /rename into the thread title, like Codex and OpenCode already do

[mckhendry]

/rename in a Claude Code session doesn't reach the T3 thread title. Codex and OpenCode emit thread.metadata.updated; ClaudeAdapter.ts doesn't. The rename is already on disk — custom-title.json, exposed by the SDK as SDKSessionInfo.customTitle. Ask: emit that event from ClaudeAdapter, marked as a user rename — canReplaceThreadTitle runs with no seed and drops it on an already-titled thread. Claude to T3 only.

Related:

• [Feature]: Let the agent update its thread title once the work is actually decided #7333 — an agent-called title tool; here the user already typed one.
• Agent-controlled T3 threads: a multi-provider proof of concept #8433 — agent-controlled thread lifecycle, a new surface; this is adapter parity.
• [Bug]: OpenCode provider overwrites user-set thread titles repeatedly (provider title mirror bypasses canReplaceThreadTitle) #5245 — the mirror overwriting user titles; the constraint this respects.

Drafted with Claude Code (Claude Opus 5) from source and transcripts on my machine; I reviewed and posted it.