Receipts

Each receipt page shows the two arms, what was verified, and how to check the file yourself. They are listed here by report, newest report first.

Report 013: Claude Sonnet 5.5, the day after its release

Read Report 013.

• code-review-and-quality on Claude Opus 5.5, run 1, 2026-09-29
• code-review-and-quality on Claude Opus 5.5, run 2, 2026-09-29
• code-review-and-quality on Claude Opus 5.5, run 3, 2026-09-29
• code-review-and-quality on Claude Sonnet 5, run 1, 2026-09-29
• code-review-and-quality on Claude Sonnet 5, run 2, 2026-09-29
• code-review-and-quality on Claude Sonnet 5, run 3, 2026-09-29
• code-review-and-quality on Claude Sonnet 5.5, run 1, 2026-09-29
• code-review-and-quality on Claude Sonnet 5.5, run 2, 2026-09-29
• code-review-and-quality on Claude Sonnet 5.5, run 3, 2026-09-29
• documentation-and-adrs on Claude Opus 5.5, run 1, 2026-09-29
• documentation-and-adrs on Claude Opus 5.5, run 2, 2026-09-29
• documentation-and-adrs on Claude Opus 5.5, run 3, 2026-09-29
• documentation-and-adrs on Claude Sonnet 5, run 1, 2026-09-29
• documentation-and-adrs on Claude Sonnet 5, run 2, 2026-09-29
• documentation-and-adrs on Claude Sonnet 5, run 3, 2026-09-29
• documentation-and-adrs on Claude Sonnet 5.5, run 1, 2026-09-29
• documentation-and-adrs on Claude Sonnet 5.5, run 2, 2026-09-29
• documentation-and-adrs on Claude Sonnet 5.5, run 3, 2026-09-29
• git-workflow-and-versioning on Claude Opus 5.5, run 1, 2026-09-29
• git-workflow-and-versioning on Claude Opus 5.5, run 2, 2026-09-29
• git-workflow-and-versioning on Claude Opus 5.5, run 3, 2026-09-29
• git-workflow-and-versioning on Claude Sonnet 5, run 1, 2026-09-29
• git-workflow-and-versioning on Claude Sonnet 5, run 2, 2026-09-29
• git-workflow-and-versioning on Claude Sonnet 5, run 3, 2026-09-29
• git-workflow-and-versioning on Claude Sonnet 5.5, run 1, 2026-09-29
• git-workflow-and-versioning on Claude Sonnet 5.5, run 2, 2026-09-29
• git-workflow-and-versioning on Claude Sonnet 5.5, run 3, 2026-09-29

Report 011: Claude Opus 5.5 on release day, three skills

Read Report 011.

• code-review-and-quality on Claude Opus 5, 2026-09-23
• code-review-and-quality on Claude Opus 5.5, 2026-09-23
• documentation-and-adrs on Claude Opus 5, 2026-09-23
• documentation-and-adrs on Claude Opus 5.5, 2026-09-23
• git-workflow-and-versioning on Claude Opus 5, 2026-09-23
• git-workflow-and-versioning on Claude Opus 5.5, 2026-09-23

Report 009: three skills under two eval harnesses

Read Report 009.

• code-review-and-quality on Claude Opus 5, 2026-09-15
• documentation-and-adrs on Claude Opus 5, 2026-09-15
• git-workflow-and-versioning on Claude Opus 5, 2026-09-15

Report 008: the skill stabilises the floor, not the ceiling

Read Report 008.

• code-review-and-quality on Claude Fable 5.1, 2026-09-01
• writing-plans on Claude Fable 5.1, 2026-09-02

Report 007: the baseline is the noisy arm

Read Report 007.

• code-review-and-quality on Claude Fable 5, 2026-08-31
• git-workflow-and-versioning on Claude Sonnet 5, 2026-08-31
• writing-plans on Claude Fable 5, 2026-08-31
• writing-plans on Claude Fable 5, rerun, 2026-08-31

Report 006: the skill text moves, the substrate holds still

Read Report 006.

• code-review-and-quality on Claude Fable 5, 2026-08-28
• git-workflow-and-versioning on Claude Sonnet 5, 2026-08-28
• writing-plans on Claude Fable 5, 2026-08-28

Report 005: what does a skill cost to run?

Read Report 005.

• code-review-and-quality on Claude Fable 5, 2026-08-18
• code-review-and-quality on Claude Sonnet 5, 2026-08-18
• code-review-and-quality on GPT-5.6 Sol, 2026-08-18
• commit-work on Claude Fable 5, 2026-08-18
• commit-work on Claude Sonnet 5, 2026-08-18
• commit-work on GPT-5.6 Sol, 2026-08-18
• crafting-effective-readmes on Claude Fable 5, 2026-08-18
• crafting-effective-readmes on Claude Sonnet 5, 2026-08-18
• crafting-effective-readmes on GPT-5.6 Sol, 2026-08-18
• documentation-and-adrs on Claude Fable 5, 2026-08-18
• documentation-and-adrs on Claude Sonnet 5, 2026-08-18
• documentation-and-adrs on GPT-5.6 Sol, 2026-08-18
• git-workflow-and-versioning on Claude Fable 5, 2026-08-18
• git-workflow-and-versioning on Claude Sonnet 5, 2026-08-18
• git-workflow-and-versioning on GPT-5.6 Sol, 2026-08-18
• naming-analyzer on Claude Fable 5, 2026-08-18
• naming-analyzer on Claude Sonnet 5, 2026-08-18
• naming-analyzer on GPT-5.6 Sol, 2026-08-18
• requesting-code-review on Claude Fable 5, 2026-08-18
• requesting-code-review on Claude Sonnet 5, 2026-08-18
• requesting-code-review on GPT-5.6 Sol, 2026-08-18
• skill-creator on Claude Fable 5, 2026-08-18
• skill-creator on Claude Sonnet 5, 2026-08-18
• skill-creator on GPT-5.6 Sol, 2026-08-18
• writing-clearly-and-concisely on Claude Fable 5, 2026-08-18
• writing-clearly-and-concisely on Claude Sonnet 5, 2026-08-18
• writing-clearly-and-concisely on GPT-5.6 Sol, 2026-08-18
• writing-plans on Claude Fable 5, 2026-08-18
• writing-plans on Claude Sonnet 5, 2026-08-18
• writing-plans on GPT-5.6 Sol, 2026-08-18

Report 004: does encoded expertise still lift output on the frontier tier?

Read Report 004.

• code-review-and-quality on Claude Fable 5, 2026-08-16
• code-review-and-quality on Claude Opus 5, 2026-08-16
• commit-work on Claude Fable 5, 2026-08-16
• commit-work on Claude Opus 5, 2026-08-16
• crafting-effective-readmes on Claude Fable 5, 2026-08-16
• crafting-effective-readmes on Claude Opus 5, 2026-08-16
• documentation-and-adrs on Claude Fable 5, 2026-08-16
• documentation-and-adrs on Claude Opus 5, 2026-08-16
• git-workflow-and-versioning on Claude Fable 5, 2026-08-16
• git-workflow-and-versioning on Claude Opus 5, 2026-08-16
• naming-analyzer on Claude Fable 5, 2026-08-16
• naming-analyzer on Claude Opus 5, 2026-08-16
• requesting-code-review on Claude Fable 5, 2026-08-16
• requesting-code-review on Claude Opus 5, 2026-08-16
• skill-creator on Claude Fable 5, 2026-08-16
• skill-creator on Claude Opus 5, 2026-08-16
• writing-clearly-and-concisely on Claude Fable 5, 2026-08-16
• writing-clearly-and-concisely on Claude Opus 5, 2026-08-16
• writing-plans on Claude Fable 5, 2026-08-16
• writing-plans on Claude Opus 5, 2026-08-16

Report 003: do skill verdicts hold across a model release?

Read Report 003.

• code-review-and-quality on Claude Opus 4.8, 2026-08-11
• code-review-and-quality on Claude Opus 5, 2026-08-11
• commit-work on Claude Opus 4.8, 2026-08-11
• commit-work on Claude Opus 5, 2026-08-11
• crafting-effective-readmes on Claude Opus 4.8, 2026-08-11
• crafting-effective-readmes on Claude Opus 5, 2026-08-12
• documentation-and-adrs on Claude Opus 4.8, 2026-08-12
• documentation-and-adrs on Claude Opus 5, 2026-08-11
• git-workflow-and-versioning on Claude Opus 4.8, 2026-08-11
• git-workflow-and-versioning on Claude Opus 5, 2026-08-11
• naming-analyzer on Claude Opus 4.8, 2026-08-12
• naming-analyzer on Claude Opus 5, 2026-08-12
• requesting-code-review on Claude Opus 4.8, 2026-08-11
• requesting-code-review on Claude Opus 5, 2026-08-11
• skill-creator on Claude Opus 4.8, 2026-08-11
• skill-creator on Claude Opus 5, 2026-08-12
• writing-clearly-and-concisely on Claude Opus 4.8, 2026-08-11
• writing-clearly-and-concisely on Claude Opus 5, 2026-08-11
• writing-plans on Claude Opus 4.8, 2026-08-12
• writing-plans on Claude Opus 5, 2026-08-12

Report 002: does a skill's benefit hold across substrates?

Read Report 002.

• code-review-and-quality on Claude Sonnet 5, 2026-07-30
• code-review-and-quality on GPT-5.6 Sol, 2026-07-30
• commit-work on Claude Sonnet 5, 2026-07-30
• commit-work on GPT-5.6 Sol, 2026-07-30
• crafting-effective-readmes on Claude Sonnet 5, 2026-07-30
• crafting-effective-readmes on GPT-5.6 Sol, 2026-07-30
• documentation-and-adrs on Claude Sonnet 5, 2026-07-30
• documentation-and-adrs on GPT-5.6 Sol, 2026-07-30
• git-workflow-and-versioning on Claude Sonnet 5, 2026-07-30
• git-workflow-and-versioning on GPT-5.6 Sol, 2026-07-30
• naming-analyzer on Claude Sonnet 5, 2026-07-31
• naming-analyzer on GPT-5.6 Sol, 2026-07-31
• requesting-code-review on Claude Sonnet 5, 2026-07-31
• requesting-code-review on GPT-5.6 Sol, 2026-07-31
• skill-creator on Claude Sonnet 5, 2026-07-31
• skill-creator on GPT-5.6 Sol, 2026-07-31
• writing-clearly-and-concisely on Claude Sonnet 5, 2026-07-30
• writing-clearly-and-concisely on GPT-5.6 Sol, 2026-07-30
• writing-plans on Claude Sonnet 5, 2026-07-31
• writing-plans on GPT-5.6 Sol, 2026-07-31

Report 001: do skill verdicts hold across a model release?

Read Report 001.

• code-review-and-quality on Claude Sonnet 4.6, 2026-07-28
• code-review-and-quality on Claude Sonnet 5, 2026-07-28
• commit-work on Claude Sonnet 4.6, 2026-07-30
• commit-work on Claude Sonnet 5, 2026-07-30
• crafting-effective-readmes on Claude Sonnet 4.6, 2026-07-28
• crafting-effective-readmes on Claude Sonnet 5, 2026-07-28
• documentation-and-adrs on Claude Sonnet 4.6, 2026-07-28
• documentation-and-adrs on Claude Sonnet 5, 2026-07-28
• git-workflow-and-versioning on Claude Sonnet 4.6, 2026-07-30
• git-workflow-and-versioning on Claude Sonnet 5, 2026-07-30
• naming-analyzer on Claude Sonnet 4.6, 2026-07-28
• naming-analyzer on Claude Sonnet 5, 2026-07-28
• requesting-code-review on Claude Sonnet 4.6, 2026-07-28
• requesting-code-review on Claude Sonnet 5, 2026-07-28
• skill-creator on Claude Sonnet 4.6, 2026-07-28
• skill-creator on Claude Sonnet 5, 2026-07-28
• writing-clearly-and-concisely on Claude Sonnet 4.6, 2026-07-28
• writing-clearly-and-concisely on Claude Sonnet 5, 2026-07-28
• writing-plans on Claude Sonnet 4.6, 2026-07-28
• writing-plans on Claude Sonnet 5, 2026-07-28

Receipts outside a report

• commit-message-conventions on Claude Haiku 4.5, 2026-07-27
• commit-message-conventions on Claude Haiku 4.5, 2026-09-16
• commit-message-conventions on Claude Haiku 4.5, 2026-09-17