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mobilebuildmcp-snapshot-fixture-review

Skill6.5k starsChanged 39 days agoMITView on GitHub

Use when reviewing MobileBuildMCP snapshot fixture changes for MCP, CLI, and JSON output contract integrity.

We split this skill into the rules it gives an agent

7 rules. About 0 are common, 6 are distinctive, and 1 is very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈6

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 1

    Very specific

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

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Do not edit product code unless the user explicitly requests implementation changes.

    line 13
  2. Distinctive:

    Do not update fixtures only to make tests pass.

    line 28
  3. Very specific:

    Verify project-defined normalization sentinels in normalization code and tests before reporting them as implausible fixture values.

    line 33
  4. Distinctive:

    Do not emit separate findings for equivalent CLI, MCP, text, or JSON drift.

    line 37
  5. Distinctive:

    Do not repeat a finding that is already resolved by the current diff.

    line 38
  6. Distinctive:

    Do not run snapshot or smoke suites as part of an automated PR review.

    line 43
  7. Distinctive:

    Prefer one high-confidence cross-fixture finding over multiple speculative discrepancies.

    line 44

≈ “Common” is an estimate: at least 1 in 5 of the 308,232 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

MobileBuildMCP Snapshot Fixture Review

Review guardrails for fixture and snapshot contract integrity.

Review scope

  • Review-only by default.
  • Do not edit product code unless the user explicitly requests implementation changes.

Files to inspect

  • src/snapshot-tests/__fixtures__/**
  • src/snapshot-tests/contracts.ts
  • src/snapshot-tests/fixture-io.ts
  • src/snapshot-tests/__tests__/fixture-io.test.ts
  • src/snapshot-tests/__tests__/json-normalize.test.ts
  • src/snapshot-tests/__tests__/json-fixture-schema.test.ts
  • xcodebuildmcp.com/app/docs/_content/testing.mdx

Guardrails

  • Fixture updates map to intentional behavior changes.
  • Do not update fixtures only to make tests pass.
  • MCP, CLI, and JSON fixture updates stay aligned.
  • JSON fixtures preserve stable structured output envelopes.
  • Volatile values are normalized in code, not patched ad hoc in fixtures.
  • Missing fixtures are generated through the snapshot update flow.
  • Verify project-defined normalization sentinels in normalization code and tests before reporting them as implausible fixture values. In particular, 99999 is an intentional sentinel for volatile UI capture counts.
  • Group every occurrence of the same root cause into one finding and list the affected fixtures. Do not emit separate findings for equivalent CLI, MCP, text, or JSON drift.
  • Do not repeat a finding that is already resolved by the current diff.

Review limits

  • Review the changed fixtures and the directly relevant normalization or contract code only.
  • Do not run snapshot or smoke suites as part of an automated PR review.
  • Prefer one high-confidence cross-fixture finding over multiple speculative discrepancies.

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Mentions a month of the getsentry/MobileBuildMCP repository that our weekly crawl found: only 7 in all, so this is a hint, not a trend. There is no adoption data for this file yet.

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Talked about on GitHub (7 times).

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