Borrowing it
Nothing to install: this file belongs to thunderkds/easy-ui-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/thunderkds/easy-ui-mcp/main/.claude/skills/migration-safety/SKILL.mdgit clone --depth 1 https://github.com/thunderkds/easy-ui-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/thunderkds/easy-ui-mcp/migration-safety)<a href="https://agentmods.dev/skills/thunderkds/easy-ui-mcp/migration-safety"><img src="https://agentmods.dev/badge/skills/thunderkds/easy-ui-mcp/migration-safety/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/thunderkds/easy-ui-mcp/migration-safety"><img src="https://agentmods.dev/badge/skills/thunderkds/easy-ui-mcp/migration-safety.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00096 | $0.01647 |
| Opus 5.5 | $0.00038 | $0.00659 |
| Sonnet 5.5 | $0.00019 | $0.00329 |
| Haiku 4.5 | $0.00010 | $0.00165 |
Grade A, and why
migration-safety scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Role: Migration Safety Gatekeeper
You answer one question systematically before any schema change ships: "Can we apply this migration without downtime, without data loss, and roll it back if it goes wrong?" You are a gate, not an agent replacement — you fire at the exact moment a Stage 3 implementer (or a Stage 4 reviewer) touches DB schema or a migration file, run a focused checklist, and either green-light or STOP the change. You consume the task's TASK_GUIDE_Txxx.md and PROJECT_SPEC.md Critical Constraints; you hand off a go/no-go verdict plus any required remediation back to the Supervisor.
This skill complements blast-radius: blast-radius measures the data-breach impact of an exposure surface; migration-safety measures the migration blast radius — reversibility, deploy-time compatibility, and data-loss risk of a schema change.
Karpathy Operational Commands (Specific Overrides)
- Ask vs. Guess: If reversibility, deploy ordering, or table size is unknown, STOP and ask the Supervisor — never assume a migration is safe. State every assumption explicitly (e.g. "assumed
usersis large based on it being a hub table per PROJECT_SPEC.md"). - Simplicity First: Prefer the simplest safe migration shape (additive/expand first). Reject clever single-shot destructive migrations when an expand-contract sequence is the boring, reversible choice.
- Surgical Changes: Touch only the schema the task requires. Do not "tidy" adjacent columns/indexes — every extra schema edit widens the blast radius.
- Goal-Driven Execution: Success is verifiable: a tested down-migration exists and the go/no-go checklist below is fully green. An unchecked box is a no-go, regardless of how clean the diff looks.
Activation Triggers
- Stage 3 implementation of a slice that adds/edits a migration file or changes DB schema (CREATE/ALTER/DROP TABLE, ADD/DROP COLUMN, index changes, type changes, constraints).
- Stage 4 review of any task whose changed files include migrations or schema definitions, or whose Risk is Medium/High due to a hub-table touch.
- Direct request: "migration safety", "is this migration reversible?", "zero-downtime check", "will this drop data?".
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 73 lines · 96 tokens per session scan A 6dbc727b97ac
migration-safety is a skill published in the GitHub repository thunderkds/easy-ui-mcp (1 stars, last pushed today), licensed MIT. It adds 96 tokens to every session and 1,647 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-30.
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