git-workflow-and-versioning: worth installing? Measured results

Measured results for git-workflow-and-versioning (addyosmani/agent-skills) from Driftproof, one row per receipt, in plain words.

Skill skills/git-workflow-and-versioning in addyosmani/agent-skills.

One row per receipt. No figure on this page combines two rows.

Measured by: Measured by Driftproof, Report 014
Model: Claude Haiku 4.5 (claude-haiku-4-5-20251001)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-10-07
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.813 with the skill and 0.839 without, with enough answers to have seen a gap of 0.05.
Tokens: 17698 input and 1299 output tokens per call with the skill; 14085 and 732 without. 0.0242 US dollars per call with the skill, 0.0177 without, at list price from the receipt's price snapshot.
Freshness: Measured on Haiku 4.5. The registry lists no haiku model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-haiku-4-5-20251001-2026-10-07.json

Measured by: Measured by Driftproof, Report 014
Model: Claude Haiku 4.5 (claude-haiku-4-5-20251001)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-10-07
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.828 with the skill and 0.838 without, with enough answers to have seen a gap of 0.05.
Tokens: 17698 input and 1999 output tokens per call with the skill; 14085 and 695 without. 0.0277 US dollars per call with the skill, 0.0176 without, at list price from the receipt's price snapshot.
Freshness: Measured on Haiku 4.5. The registry lists no haiku model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-haiku-4-5-20251001-2026-10-07.json

Measured by: Measured by Driftproof, Report 014
Model: Claude Haiku 5.5 (claude-haiku-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-10-07
Tasks and runs: 1 task; 3 runs with the skill and 7 without
Result: Too few answers to tell: 0.848 with the skill and 0.613 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 commit-message-conventional-type: the two arms' spreads sum to 0.297, at or above the 0.05 floor).
Tokens: 24834 input and 616 output tokens per call with the skill; 19830 and 643 without. 0.0028 US dollars per call with the skill, 0.0023 without, at list price from the receipt's price snapshot.
Freshness: Measured on claude-haiku-5-5. Freshness unknown: the model is not in the registry.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-haiku-5-5-2026-10-07.json

Measured by: Measured by Driftproof, Report 014
Model: Claude Haiku 4.5 (claude-haiku-4-5-20251001)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-10-07
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.832 with the skill and 0.834 without, with enough answers to have seen a gap of 0.05.
Tokens: 17698 input and 513 output tokens per call with the skill; 14085 and 770 without. 0.0203 US dollars per call with the skill, 0.0179 without, at list price from the receipt's price snapshot.
Freshness: Measured on Haiku 4.5. The registry lists no haiku model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-haiku-4-5-20251001-2026-10-07.json

Measured by: Measured by Driftproof, Report 014
Model: Claude Haiku 5.5 (claude-haiku-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-10-07
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.839 with the skill and 0.849 without, with enough answers to have seen a gap of 0.05.
Tokens: 24834 input and 432 output tokens per call with the skill; 19830 and 798 without. 0.0027 US dollars per call with the skill, 0.0024 without, at list price from the receipt's price snapshot.
Freshness: Measured on claude-haiku-5-5. Freshness unknown: the model is not in the registry.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-haiku-5-5-2026-10-07.json

Measured by: Measured by Driftproof, Report 014
Model: Claude Haiku 5.5 (claude-haiku-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-10-07
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: The skill clearly helped: 0.849 with it and 0.300 without, on 1 test task.
Tokens: 24834 input and 603 output tokens per call with the skill; 19830 and 695 without. 0.0028 US dollars per call with the skill, 0.0023 without, at list price from the receipt's price snapshot.
Freshness: Measured on claude-haiku-5-5. Freshness unknown: the model is not in the registry.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-haiku-5-5-2026-10-07.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Opus 5.5 (claude-opus-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 4 without
Result: Too few answers to tell: 0.856 with the skill and 0.579 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 commit-message-conventional-type: the two arms' spreads sum to 0.332, at or above the 0.05 floor).
Tokens: 17733 input and 342 output tokens per call with the skill; 12729 and 331 without. 0.0778 US dollars per call with the skill, 0.0575 without, at list price from the receipt's price snapshot.
Freshness: Measured on Opus 5.5. The registry lists no opus model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-opus-5-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Sonnet 5 (claude-sonnet-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: Too few answers to tell: 0.831 with the skill and 0.836 without, but the scores varied too much to call it. Not enough draws to conclude at this effect floor. Draws needed: 14 draws per arm (case commit-message-conventional-type), with the spreads held.
Tokens: 24155 input and 94 output tokens per call with the skill; 19151 and 114 without. 0.0492 US dollars per call with the skill, 0.0394 without, at list price from the receipt's price snapshot.
Freshness: Measured on Sonnet 5. The registry lists no sonnet model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-sonnet-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Sonnet 5.5 (claude-sonnet-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.863 with the skill and 0.857 without, with enough answers to have seen a gap of 0.05.
Tokens: 17737 input and 199 output tokens per call with the skill; 12733 and 227 without. 0.0375 US dollars per call with the skill, 0.0277 without, at list price from the receipt's price snapshot.
Freshness: Measured on claude-sonnet-5-5. Freshness unknown: the model is not in the registry.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-sonnet-5-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Opus 5.5 (claude-opus-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 9 without
Result: The skill clearly helped: 0.857 with it and 0.485 without, on 1 test task.
Tokens: 17733 input and 353 output tokens per call with the skill; 12729 and 313 without. 0.0780 US dollars per call with the skill, 0.0572 without, at list price from the receipt's price snapshot.
Freshness: Measured on Opus 5.5. The registry lists no opus model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-opus-5-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Sonnet 5 (claude-sonnet-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: Too few answers to tell: 0.851 with the skill and 0.831 without, but the scores varied too much to call it. Not enough draws to conclude at this effect floor. Draws needed: 19 draws per arm (case commit-message-conventional-type), with the spreads held.
Tokens: 24155 input and 106 output tokens per call with the skill; 19151 and 105 without. 0.0494 US dollars per call with the skill, 0.0394 without, at list price from the receipt's price snapshot.
Freshness: Measured on Sonnet 5. The registry lists no sonnet model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-sonnet-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Sonnet 5.5 (claude-sonnet-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.863 with the skill and 0.850 without, with enough answers to have seen a gap of 0.05.
Tokens: 17737 input and 180 output tokens per call with the skill; 12733 and 172 without. 0.0373 US dollars per call with the skill, 0.0272 without, at list price from the receipt's price snapshot.
Freshness: Measured on claude-sonnet-5-5. Freshness unknown: the model is not in the registry.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-sonnet-5-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Opus 5.5 (claude-opus-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 8 without
Result: The skill clearly helped: 0.861 with it and 0.508 without, on 1 test task.
Tokens: 17733 input and 307 output tokens per call with the skill; 12729 and 330 without. 0.0771 US dollars per call with the skill, 0.0575 without, at list price from the receipt's price snapshot.
Freshness: Measured on Opus 5.5. The registry lists no opus model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-opus-5-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Sonnet 5 (claude-sonnet-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: Too few answers to tell: 0.814 with the skill and 0.802 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 commit-message-conventional-type: the two arms' spreads sum to 0.071, at or above the 0.05 floor).
Tokens: 24155 input and 94 output tokens per call with the skill; 19151 and 127 without. 0.0492 US dollars per call with the skill, 0.0396 without, at list price from the receipt's price snapshot.
Freshness: Measured on Sonnet 5. The registry lists no sonnet model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-sonnet-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 013
Model: Claude Sonnet 5.5 (claude-sonnet-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-29
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: No clear difference: 0.860 with the skill and 0.860 without, with enough answers to have seen a gap of 0.05.
Tokens: 17737 input and 183 output tokens per call with the skill; 12733 and 175 without. 0.0373 US dollars per call with the skill, 0.0272 without, at list price from the receipt's price snapshot.
Freshness: Measured on claude-sonnet-5-5. Freshness unknown: the model is not in the registry.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-sonnet-5-5-2026-09-29.json

Measured by: Measured by Driftproof, Report 011
Model: Claude Opus 5 (claude-opus-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-23
Tasks and runs: 1 task; 3 runs with the skill and 10 without
Result: Too few answers to tell: 0.861 with the skill and 0.765 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 commit-message-conventional-type: the two arms' spreads sum to 0.278, at or above the 0.05 floor).
Tokens: 9667 input and 1148 output tokens per call with the skill; 4663 and 1614 without. 0.0770 US dollars per call with the skill, 0.0637 without, at list price from the receipt's price snapshot.
Freshness: Measured on Opus 5. The registry lists no opus model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-opus-5-2026-09-23.json

Measured by: Measured by Driftproof, Report 011
Model: Claude Opus 5.5 (claude-opus-5-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-23
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: The skill clearly helped: 0.838 with it and 0.300 without, on 1 test task.
Tokens: 8667 input and 292 output tokens per call with the skill; 3663 and 341 without. 0.0405 US dollars per call with the skill, 0.0215 without, at list price from the receipt's price snapshot.
Freshness: Measured on Opus 5.5. The registry lists no opus model released after this run, as of the build date.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-opus-5-5-2026-09-23.json

Measured by: Measured by Driftproof, Report 009
Model: Claude Opus 5 (claude-opus-5)
Harness: Driftproof runner 0.10.1 on claude-cli
Date: 2026-09-15
Tasks and runs: 1 task; 3 runs with the skill and 3 without
Result: The skill clearly helped: 0.862 with it and 0.300 without, on 1 test task.
Tokens: 7557 input and 394 output tokens per call with the skill; 2553 and 323 without. 0.0476 US dollars per call with the skill, 0.0208 without, at list price from the receipt's price snapshot.
Freshness: Measured on Opus 5. Registered opus models released after this run, as of the build date: Opus 5.5.
Skill commit: be4e44a9fbc5e8df0beaefadbb28bd22ee61cc39
Receipt: git-workflow-and-versioning-claude-opus-5-2026-09-15.json

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