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 sethdford/claude-skills --skill migration-strategygit clone --depth 1 https://github.com/sethdford/claude-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/sethdford/claude-skills/migration-strategy)<a href="https://agentmods.dev/skills/sethdford/claude-skills/migration-strategy"><img src="https://agentmods.dev/badge/skills/sethdford/claude-skills/migration-strategy/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/sethdford/claude-skills/migration-strategy"><img src="https://agentmods.dev/badge/skills/sethdford/claude-skills/migration-strategy.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 | $0.00025 | $0.00232 |
| Opus 5 | $0.00013 | $0.00116 |
| Sonnet 5 | $0.00005 | $0.00046 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
migration-strategy 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 10d 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
Migration Strategy
Plan phased migrations that minimize risk and disruption while delivering value incrementally.
Instructions
- Assess Current State: What's working? What's broken?
- Define Target State: New architecture vision
- Identify Seams: Where can you break the system into phases?
- Plan Phases: Each phase delivers value; takes weeks to months
- Risk Mitigation: Parallel running, feature flags, rollback plans
- Success Metrics: How do we measure success of each phase?
Anti-Patterns
- Big Bang Rewrite: Replace everything at once. Result: chaos and failure. Guard: Incremental, staged migration.
- No Parallel Running: Migrate directly without validation. Guard: Run old and new in parallel, validate.
Further Reading
- Strangler Fig Pattern — incremental replacement
- Monolith to Microservices by Sam Newman
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.
- 10d ago First seen · 28 lines · 25 tokens per session scan A e9fe9ff9d848
migration-strategy is a skill published in the GitHub repository sethdford/claude-skills (40 stars, last pushed 6mo ago), licensed MIT. It adds 25 tokens to every session and 232 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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