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 Vimalk0703/shipworthy --skill migration-strategiesgit clone --depth 1 https://github.com/Vimalk0703/shipworthyWrote 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/vimalk0703/shipworthy/migration-strategies)<a href="https://agentmods.dev/skills/vimalk0703/shipworthy/migration-strategies"><img src="https://agentmods.dev/badge/skills/vimalk0703/shipworthy/migration-strategies/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/vimalk0703/shipworthy/migration-strategies"><img src="https://agentmods.dev/badge/skills/vimalk0703/shipworthy/migration-strategies.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 | $0.00042 | $0.02450 |
| Opus 5 | $0.00021 | $0.01225 |
| Sonnet 5 | $0.00008 | $0.00490 |
| Haiku 4.5 | $0.00004 | $0.00245 |
Grade A, and why
migration-strategies 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.
How it starts
The opening of the file, as written. The whole thing — 289 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Migration Strategies
Core Principle
Every migration must be reversible until fully verified. Never cut over to a new system without running it alongside the old one first. The migration strategy you choose determines your risk profile, rollback speed, and verification confidence.
Decision Matrix
| Strategy | Best For | Rollback Speed | Complexity | Data Migration? |
|---|---|---|---|---|
| Strangler Fig | Replacing a monolith with microservices | Fast (route traffic back) | Medium | Gradual |
| Parallel Run | Replacing a critical data processing system | Instant (read from old) | High | Yes, bidirectional |
| Expand-Contract | Database schema changes, API changes | Medium (revert schema) | Low-Medium | In-place |
| Blue-Green | Full application deployments | Instant (swap environments) | Medium | Shared or replicated |
| Feature Flag Migration | Replacing internal components or algorithms | Instant (toggle flag) | Low | Depends |
1. Strangler Fig Pattern
When to Use
- Migrating from a monolith to microservices.
- Replacing a legacy system piece by piece over weeks or months.
- You want to avoid a big-bang rewrite.
How It Works
- Place a routing layer (API gateway, reverse proxy) in front of the legacy system.
- Build new functionality in the new system.
- Route traffic for specific endpoints/features to the new system.
- Gradually expand the new system's surface area until the legacy system handles nothing.
- Decommission the legacy system.
Phase 1: Client -> Gateway -> Legacy System (all traffic)
Phase 2: Client -> Gateway -> Legacy System (most traffic)
-> New Service A (/users)
Phase 3: Client -> Gateway -> Legacy System (some traffic)
-> New Service A (/users)
-> New Service B (/orders)
Phase N: Client -> Gateway -> New Services (all traffic)
Legacy System (decommissioned)
Implementation
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 · 289 lines · 42 tokens per session scan A f7419a598cf5
migration-strategies is a skill published in the GitHub repository Vimalk0703/shipworthy (7 stars, last pushed 5mo ago), licensed MIT. It adds 42 tokens to every session and 2,450 once invoked, about $0.0002 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 2026-08-31.
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