Match saveAgentColor with its new options argument on Claude Code 2.1.233

[VitalyOstanin]

Problem

On Claude Code 2.1.233 the whole session-color patch bails out:

patch: sessionColor: failed to patch saveAgentColor

saveAgentColor grew a fourth parameter, which it forwards to the transcript append call:

async function o2n(e,t,r,n){
  let o=r??yj(e);
  try{await Kie(o,{type:"agent-color",agentColor:t,sessionId:e},n)}
  catch(i){/* … */}
  if(e===qt())Cu().currentSessionAgentColor=t;
  O("tengu_agent_color_set",{})
}

The pattern pinned the signature to exactly three parameters and the append call to exactly two arguments, so neither of the two alternatives matched, and writeSessionColor returned null even though its app-state injections were fine.

Fix

Make the extra parameter and the extra argument optional. Capture-group numbering is untouched (both additions are non-capturing), so the extraction of the function name and the session-id getter is unchanged.

Verification

Ran the old and the new implementation over every extracted bundle I have (2.1.88, 2.1.89, 2.1.92, 2.1.98, 2.1.113, 2.1.126, 2.1.144, 2.1.183, 2.1.195, 2.1.201, 2.1.204, 2.1.214, 2.1.219, 2.1.233):

• On all 13 pre-2.1.233 bundles the new patterns produce a byte-identical result.
• On 2.1.233 the old patterns produce null; the new ones inject globalThis.__tweakccSaveAgentColor=(c)=>o2n(qt(),c);, which matches the if(e===qt()) check inside that function.
• Exactly one match per bundle, so the looser patterns cannot latch onto a different function.
• Cost per bundle: 5–27 ms.

Applied to a real 2.1.233 native binary: the patch reports success, TWEAKCC_SESSION_COLOR and __tweakccSaveAgentColor are present in the patched bundle, and the binary runs (2.1.233 (Claude Code)).

A regression test covers the new shape; the existing tests for the three earlier shapes still pass. Full suite, tsc, ESLint and Prettier are clean.

[coderabbitai]

Caution

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