Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Make a TCP key-value server follow its wire protocol (pipelining, split reads, binary payloads, expiry, close rules)

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  "result": "I rewrote `server.py` on asyncio so it follows PROTOCOL.md. A local test script that I kept outside the work directory passes 23 of 23 checks, covering the points you listed.\n\n**What changed**\n- **Concurrency:** one event loop serves all clients, and each command runs without awaiting, so the shared store needs no locks. A stalled or garbage client only affects its own connection.\n- **Parsing:** input is read as a stream, so commands can be split or merged arbitrarily and pipelined. Commands are case-insensitive. Payloads are read as exactly `<len>` bytes plus a CRLF check, so `\\r\\n` inside a payload is fine.\n- **Errors and closing:** wrong args, unknown commands, too-large lengths, overlong lines and bad payloads all return the exact replies in the spec. Lines over 1024 bytes are rejected as soon as they pass that length, even before their CRLF arrives. Before closing, the server flushes the final reply and absorbs pending input for up to 1 second, so the client doesn't see a TCP reset that drops the reply.\n- **Expiry:** deadlines use a monotonic clock. Expired keys are dropped on access. `SET` clears expiry; `INCR` keeps it.\n- **Command line:** unchanged, `python3 server.py [port]`, then `F03_PORT`, then 18601, bound to 127.0.0.1. I checked the env var and the default port.\n\n**Judgment calls where the spec is silent**\n- `EXPIRE` with a non-numeric time returns `-ERR wrong args`. Negative or zero times are accepted; the key then expires immediately and the reply is `:1`.\n- An empty line gets `-ERR unknown command`, because each command must get one reply.\n- Expired keys are only removed when touched. There is no background sweep, so untouched expired keys stay in memory.\n\n**Known limitation**\n- `INCR` on a value near the 1 MB limit parses a huge integer on the event loop. That can stall every client for some time. I didn't add a guard, since any cap would change the \"base-10 integer\" behaviour the spec requires.\n\nThe work directory is not a git repo, so I did not commit anything. The test script is at `/tmp/mkvtest/test_mkv.py` if you want to rerun it.",
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