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Migration Writer — measured AI agent skill | DecimalAI

archive228/migration-writer

SkillScore50Maintained

Write safe, reversible database migrations for this repo's conventions. Use for any schema change.

Databy archive228

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Data Engineer pack

1 · One-time — install the CLI (docs ↗)

pip install decimalai

2 · Get the skill — writes .claude/skills/archive228-migration-writer/SKILL.md

decimalai skills pull archive228-migration-writer --out .claude/skills/

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/archive228-migration-writer/SKILL.md https://app.decimal.ai/s/archive228-migration-writer/SKILL.md

Raw file: /s/archive228-migration-writer/SKILL.md ↗ · machine-readable summary at /s/archive228-migration-writer.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

22 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 6h ago

Yes — +23% lift+2% tokens0% turns50% of whole cases pass with skill (11/22)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-01	✗→✓	▲ Improved	-25%	0%
case-02	✗→✓	▲ Improved	-10%	0%
case-12	✗→✓	▲ Improved	-16%	0%
case-09	✗→✓	▲ Improved	70%	0%
case-14	✗→✓	▲ Improved	-10%	0%

Showing 5 of 22 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

archive228 / loopkit

skills/migration-writer/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

Skill contents

SKILL.md

Migration Writer

Read the current schema first. Match the repo's migration tool and naming (NNN_<verb>_<noun>).
Write BOTH up and down. A migration you can't reverse is a migration you can't deploy safely.
Live-safe: on a hot table, adding a NOT NULL column with no default, or an index without CONCURRENTLY, takes a blocking lock. Split into steps: add nullable → backfill → add constraint.
Backfill large tables in batches, not one statement.
Never edit an already-merged migration — add a new one.

Test with a dry-run before committing. Output the migration + the exact deploy order.

Want to see if archive228/migration-writer would activate on your phrasing? Try it before you install — no LLM call, no signup.

Other measured skills in the registry, with their headline benchmark lift.