Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add codebygarv/Ai-skills --skill zero-downtime-migration-plannergit clone --depth 1 https://github.com/codebygarv/Ai-skillsWrote 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/codebygarv/ai-skills/zero-downtime-migration-planner)<a href="https://agentmods.dev/skills/codebygarv/ai-skills/zero-downtime-migration-planner"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/zero-downtime-migration-planner/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/codebygarv/ai-skills/zero-downtime-migration-planner"><img src="https://agentmods.dev/badge/skills/codebygarv/ai-skills/zero-downtime-migration-planner.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 | $0.00029 | $0.00411 |
| Opus 5 | $0.00015 | $0.00205 |
| Sonnet 5 | $0.00006 | $0.00082 |
| Haiku 4.5 | $0.00003 | $0.00041 |
Grade A, and why
zero-downtime-migration-planner 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 9d 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.
What it actually says
Purpose
Formulate zero-downtime deployment and database migration blueprints (Expand/Contract pattern, Parallel Run, Blue-Green, Canary) allowing continuous availability during breaking changes.
When to Use
- Renaming or splitting database columns in high-traffic tables.
- Replacing a core microservice or authentication provider without maintenance windows.
- Executing major database engine upgrades with replication cutovers.
What to Analyze
- Expand & Contract Phases:
- Phase 1 (Expand): Add new nullable column/table alongside old one.
- Phase 2 (Dual Write): App writes to both old and new columns, reads from old.
- Phase 3 (Backfill): Background job migrates historical data.
- Phase 4 (Read Switch): App switches reads to new column.
- Phase 5 (Contract): Stop writing to old column and drop it.
- Backward Compatibility: Ensure running v1 and v2 app versions can simultaneously operate on the database.
- Traffic Splitting & Canary Gates: 1% $ ightarrow$ 5% $ ightarrow$ 25% $ ightarrow$ 100% traffic shifting with automated rollback triggers.
- Locking & DDL Safety: Avoiding exclusive table locks (
ACCESS EXCLUSIVE) during migration runs.
Output Format
- Multi-Phase Deployment Roadmap: Numbered phases with release gates.
- Database DDL / Migration Scripts: Safe non-blocking migration code.
- Rollback Procedure per Phase: How to abort at any phase without data loss.
Avoid
- Renaming a database column directly in a single deployment (causes instant 500 errors).
- Running large table updates in a single blocking transaction.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 38 lines · 29 tokens per session scan A 7ce8ed7e9768
zero-downtime-migration-planner is a skill published in the GitHub repository codebygarv/Ai-skills (25 stars, last pushed 19d ago), licensed MIT. It adds 29 tokens to every session and 411 once invoked, about $0.0001 per session on Opus 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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