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concurrency-and-ordering-check

Skill0 starsChanged 16 days agoMITView on GitHub

Send several requests at once and confirm replies stay attributable and the server stays consistent. Use when the server indexes files or holds state that concurrent calls could race on

The file

We split this skill into the rules it gives an agent

5 rules. About 0 are common, 5 are distinctive, and 0 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈5

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Write several requests with distinct ids

    line 20
  2. Distinctive:

    Read replies and match each to its id

    line 22
  3. Distinctive:

    Check that no reply is missing or duplicated

    line 23
  4. Distinctive:

    every id appears exactly once in the replies

    line 29
  5. Distinctive:

    every request id is answered exactly once

    line 62

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Concurrency and Ordering Check

Send several requests at once and confirm replies stay attributable and the server stays consistent

Use when: the server indexes files or holds state that concurrent calls could race on

Avoid when: the server serialises all work by design and concurrency cannot occur

Procedure

  1. Write several requests with distinct ids
  2. Send them without waiting for individual replies
  3. Read replies and match each to its id
  4. Check that no reply is missing or duplicated
  5. Confirm the index was not left in a torn state after concurrent reads and one reload
  6. Record the observed ordering for the notes, since it is not guaranteed

Signals

  • every id appears exactly once in the replies
  • reply order differs from request order without breaking attribution
  • a concurrent reload does not produce a partial index
  • the server stays responsive throughout

Patterns

1. Distinct ids

requests 1..5 sent in one write

2. Attribution

replies keyed by id, never by arrival order

3. Torn state check

search after reload returns the same count

Pitfalls

  • Assuming replies arrive in request order
  • Reloading the index mid-call and reading a half-built list
  • Treating a duplicated id as harmless when it means a lost reply

Done when

  • every request id is answered exactly once
  • the index is consistent after a concurrent reload

References

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