Recognize the function-returned slash command list of Claude Code 2.1.227+

[VitalyOstanin]

Addresses the clear-screen half of #942.

Problem

Every patch that registers a slash command — clear-screen, conversation-title, toolsets — fails on recent Claude Code releases:

patch: findSlashCommandListEndPosition: failed to find arrayStartPattern
patch: writeSlashCommandDefinition: failed to find slash command array end position

findSlashCommandListEndPosition only scanned =>[ candidates. Claude Code moved the built-in command list out of an arrow-returned array and into the body of a named function (which a builtinCommandTable cache then memoizes), so there is no arrow-return candidate left to find. On 2.1.233 the list reads:

function $tS(){return[uOd,Wza,lHf,KKp,sPa,LYp,Sui,...t5n("fleetFork"),nEf,/* ... */,...h0f,...[]]}

Per #942 the failure starts with Claude Code 2.1.227; I verified the new shape on 2.1.233.

Fix

Accept return[ alongside =>[ as a candidate opener. Everything downstream is unchanged: the candidate still has to sit within 12k characters of name:"…" … description: and still has to contain at least 30 top-level items.

Verification

Ran the old and the new scan 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-2.1.227 bundles the new scan returns the exact same closing bracket as the old one, so the injected definition lands byte-identically.
• On 2.1.233 the old scan returns null; the new one finds the 130-item list.
• Exactly one candidate passes the anchor + item-count filter on every bundle, including 2.1.233 — the looser opener does not introduce ambiguity.
• Worst case cost, a 26.6 MB already-patched bundle: 252 ms (the old pattern was ~44 ms on a raw bundle, the new one ~106 ms).

Applied to a real 2.1.233 native binary: clear-screen and a local command-registering patch both apply, and the resulting binary runs (2.1.233 (Claude Code)) with the new commands resolving.

New src/patches/slashCommands.test.ts covers both shapes, the small-array and no-anchor rejections, largest-candidate selection, and insertion through writeSlashCommandDefinition. Full suite, tsc, ESLint and Prettier are clean.

[coderabbitai]

Caution

Review failed

An error occurred during the review process. Please try again later.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}