Borrowing it
Nothing to install: this file belongs to r5rana/agentware. 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/r5rana/agentware/main/.claude/skills/safe-migration/SKILL.mdgit clone --depth 1 https://github.com/r5rana/agentwareWrote 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/r5rana/agentware/safe-migration)<a href="https://agentmods.dev/skills/r5rana/agentware/safe-migration"><img src="https://agentmods.dev/badge/skills/r5rana/agentware/safe-migration/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/r5rana/agentware/safe-migration"><img src="https://agentmods.dev/badge/skills/r5rana/agentware/safe-migration.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 | $0.00213 | $0.03119 |
| Opus 5.5 | $0.00085 | $0.01248 |
| Sonnet 5.5 | $0.00043 | $0.00624 |
| Haiku 4.5 | $0.00021 | $0.00312 |
Grade A, and why
safe-migration 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 1mo ago.
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 — 225 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Safe Migration
Portable Agent Skill (agentskills.io open standard). The YAML frontmatter above is the spec-compliant contract:
nameequals the folder name anddescriptionis the routing text. The body is HARNESS-AGNOSTIC — no hardcoded invocation syntax, no harness-only frontmatter. It drives the project's own migration tooling (Drizzle, Prisma, Alembic, Rails, Flyway, raw SQL, a config rewrite, or a file move), needs no new dependency, and installs nothing.
When to invoke: any time a change rewrites PERSISTED state — a database schema or data migration, a backfill or bulk update, a column/table rename or drop, a data-model refactor, a config-format change with on-disk state, or a file/directory restructure that other code reads. Invoke BEFORE writing the migration, while the approach is still a choice. For verifying a single endpoint after the fact use
backend-verification; for designing the new model securely usesecure-by-design/threat-modeling; this skill is the "how do I change live state without losing data or being unable to undo it" gate.
Why this skill exists
The dangerous property of a migration is that it is a write to data you cannot
re-derive. A bug in a handler can be patched; a DROP COLUMN that ran against the
only copy of the data cannot. agentware's rules already forbid acting destructively
or irreversibly without confirmation (R-AUTO-02) and require read-after-write proof
for mutations (R-VERIFY-04) — this skill is how you satisfy both for stateful
changes. The failures it prevents are the expensive ones: an in-place rename that
breaks the still-running old code mid-deploy, a backfill that half-finished and left
rows in two shapes, a "recreate everything" migration auto-generated by a diff tool
that fails because the tables already exist, and the migration that worked but had
no rollback when the app turned out to depend on the old column.
Core principle — expand, then contract
Prefer expand-contract (a.k.a. parallel-change) over a breaking in-place edit. It keeps old and new readers working at every step, so a deploy never has a moment where running code sees a shape it doesn't understand, and every step is independently revertible:
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.
- 1mo ago First seen · 225 lines · 213 tokens per session scan A 53a4e037df54
safe-migration is a skill published in the GitHub repository r5rana/agentware (24 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 213 tokens to every session and 3,119 once invoked, about $0.0009 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 2026-08-30.
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