A 9P monkey drives random requests at a throwaway session and checks the documented rules

test/monkey9p.py starts pardes --detach with its own HOME, XDG dirs and
runtime dir, speaks raw 9P (test/ninep.py) with a timeout on every reply
and Tflush for held reads, and after each seeded operation checks that
pardes is alive, the one-failure rule over a marker-delimited log window
(with and without a follower), /index against /pane, and chunked against
whole reads. Every run writes a replayable ops log; a failure is saved
with its seed and step, shrunk by delta debugging over replays, and the
run goes on in a fresh session. Teardown makes the fuzzer a subreaper and
kills every process carrying the session's token.

zig build monkey-9p -- --seed N --steps M | --replay F | --shrink F;
a 150-step fixed-seed smoke run is part of fs-test.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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