Driftproof
Skills.sh snapshot 2026-10-17: text tasks
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grill-with-docs

Here is what happened when we tested its written answers, with and without the skill.
About this test

grill-with-docs: Skills.sh snapshot 2026-10-17: text tasks by Driftproof; Haiku 5.5 judge; eval account checked before/after runs, not during

Report 015: Skills.sh snapshot 2026-10-17: text tasks

Skill skills/engineering/grill-with-docs in mattpocock/skills.

Each result has its own test record. Results are not combined.

Measured results

Both model sets use Haiku 5.5 as judge.

Driftproof measured

Answering model: Opus 5.5. Judge: Haiku 5.5. Date: 2026-10-18.

Three text-only tasks: Too few answers to tell.

The answers varied too much to settle the result.

Read test record

Why this result?

Too few answers to tell: 0.953 with the skill and 0.968 without, but the scores varied too much to call it.

Not enough draws to conclude at this effect floor. Draws needed: no draw count at these spreads (case decision: the two arms' spreads sum to 0.166, at or above the 0.05 floor).

decision, revision: too few answers to settle the result. Compare task scores

Task score bands: decision (underpowered): with skill 0.86 plus or minus 0.082158; without skill 0.93 plus or minus 0.083666; revision (underpowered): with skill 1 plus or minus 0; without skill 0.975 plus or minus 0.05.

A band is the average score plus or minus the recorded spread. These task bands, not the overall averages, determine the result.

Not enough draws to conclude at this effect floor. Draws needed: no draw count at these spreads (case decision: the two arms' spreads sum to 0.166, at or above the 0.05 floor).

Test details and sources
How this result was decided

The reader applies the task rule, with a separated-down task taking precedence. Overall means do not determine the verdict. Bands show the mean plus or minus the recorded spread; point bands can reflect score quantization.

  • decision: underpowered. With skill 0.86 plus or minus 0.082158; without skill 0.93 plus or minus 0.083666.
  • adr: not-separated. With skill 1 plus or minus 0; without skill 1 plus or minus 0.
  • revision: underpowered. With skill 1 plus or minus 0; without skill 0.975 plus or minus 0.05.

Three text-only tasks. Driftproof wrote the suite from the pinned skill description and README. These are not author-supplied tests. External tools, generated media and deployed services were not tested.

The eval account's configuration was read and found clean before and after each run, not during it.

Earlier attempts
Receipt metadata

Attempted generations: 23. Measured generations: 23. Lost draws: 0. Judge samples: 115.

Model
claude-opus-5-5
Judge
claude-haiku-5-5
Repository
mattpocock/skills
Skill path
skills/engineering/grill-with-docs/SKILL.md
Pinned commit
49dd158d1076134a641b33efb035946536778336
Harness
claude-code 2.1.287
Receipt hash
c16d64823a745011f11b6bff2417d4ade5eb92345a7b1ae121579ceea5b18b06
Plan hash
af83e8024b571620361e0e1ee1e371c21589e6788f25bbe53542fd11f941da53

Driftproof measured

Answering model: Sonnet 5.5. Judge: Haiku 5.5. Date: 2026-10-18.

Three text-only tasks: Clearly hurt.

At least one task got worse. That takes priority over the overall average.

Read test record

Why this result?

The skill clearly hurt: 0.917 with it and 0.979 without, on 3 test tasks.

decision: lower scores with the skill. Compare task scores

Task score bands: decision (separated-down): with skill 0.75 plus or minus 0.061237; without skill 0.975 plus or minus 0.05.

A band is the average score plus or minus the recorded spread. These task bands, not the overall averages, determine the result.

0.917 with the skill and 0.979 without; on at least one of the 3 test tasks, the two ranges of scores (the average plus or minus one spread) did not overlap, and the gap was at least 0.05.

Test details and sources
How this result was decided

The reader applies the task rule, with a separated-down task taking precedence. Overall means do not determine the verdict. Bands show the mean plus or minus the recorded spread; point bands can reflect score quantization.

  • decision: separated-down. With skill 0.75 plus or minus 0.061237; without skill 0.975 plus or minus 0.05.
  • adr: not-separated. With skill 1 plus or minus 0; without skill 1 plus or minus 0.
  • revision: underpowered. With skill 1 plus or minus 0; without skill 0.9625 plus or minus 0.047871.

Three text-only tasks. Driftproof wrote the suite from the pinned skill description and README. These are not author-supplied tests. External tools, generated media and deployed services were not tested.

The eval account's configuration was read and found clean before and after each run, not during it.

Earlier attempts
Receipt metadata

Attempted generations: 22. Measured generations: 22. Lost draws: 0. Judge samples: 110.

Model
claude-sonnet-5-5
Judge
claude-haiku-5-5
Repository
mattpocock/skills
Skill path
skills/engineering/grill-with-docs/SKILL.md
Pinned commit
49dd158d1076134a641b33efb035946536778336
Harness
claude-code 2.1.287
Receipt hash
8ff7ff4aa7543fbb0deb23ee464666f7e83b3ec9ec034ba4f46cfcce71b2a8fc
Plan hash
af83e8024b571620361e0e1ee1e371c21589e6788f25bbe53542fd11f941da53

How we test a skill

A skill gives an AI extra instructions. We ask: do those instructions improve its written answers?

  1. The task Same question. Same AI.

    Driftproof writes tasks from the skill description.

    Give the AI a task
  2. The comparison Change the instructions
    With the skill Written answer
    Without the skill Written answer

    Repeat both ways to see how much answers vary.

  3. The result Judge each task
    Haiku 5.5 scores the answers

    A clear drop on any task takes priority. Otherwise, a better task can mean the skill helped. When answers vary too much, we cannot settle the result.

These tests cover written answers, not installation, tool use or how useful a skill is in general.

Receipts by Driftproof (driftproofhq/driftproof), licensed Apache-2.0.

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Built on from committed receipts.