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Garry Tan
78c1f5b33c
Codex T2: flip CDP posture to deny-default. Allowed methods enumerated in cdp-allowlist.ts with (scope: tab|browser, output: trusted|untrusted, justification) per entry. Initial allowlist (~25 methods) covers: - Accessibility tree extraction (read-only) - DOM/CSS inspection (read-only) - Performance metrics - Tracing - Emulation viewport/UA override - Page screenshot/PDF capture (output is binary, no marker injection vector) - Network.enable/disable (no bodies/cookies — those are exfil surfaces) - Runtime.getProperties (NO evaluate/callFunctionOn — those would be RCE) Page.navigate is INTENTIONALLY NOT allowed; agents use $B goto which goes through the URL blocklist. Codex T7: two-tier mutex. tab-scoped methods take per-tab lock; browser- scoped take global lock that blocks all tab locks. 5s acquire timeout yields CDPMutexAcquireTimeout (no silent hangs). All lock acquires use try/finally so errors don't leak the lock. Path A from spike: uses Playwright's newCDPSession() per page. No second WebSocket, no need for --remote-debugging-port. CDPSession is cached per page in a WeakMap and cleared on page close. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>