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Step 0 read the old pid with `grep -o '"pid":[0-9]*'` and Step 2 read the port the same way. Neither can match. Every writer of that file in browse/src/server.ts serializes with `JSON.stringify(state, null, 2)`, so the bytes on disk are `"pid": 12060` — colon, space, digits. The failure was silent in the worst way. `_OLD_PID` came back empty, the kill never ran, browse.json was deleted anyway, and the next `connect` died with "existing daemon has different config (proxy/headed mismatch)" — an error pointing at proxy/headed flags rather than at the cleanup that no-opped. Caught against a daemon left over from a reboot: the operator was told to check flags they had never passed. Both patterns now accept optional whitespace. The new tripwire does not match strings — it RUNS the snippets the skill hands the agent, against a state file written exactly the way the server writes one, and asserts pid and port come back out. A third case pins the coupling to `JSON.stringify(state, null, 2)`, so a switch to compact JSON surfaces as a failing expectation rather than as silence. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0111Mq3JGwZDcstn5wYcbhSw