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.
git clone --depth 1 https://github.com/TheBeardedBearSAS/claude-craftWrote 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/agents/thebeardedbearsas/claude-craft/migration-specialist)<a href="https://agentmods.dev/agents/thebeardedbearsas/claude-craft/migration-specialist"><img src="https://agentmods.dev/badge/agents/thebeardedbearsas/claude-craft/migration-specialist/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/agents/thebeardedbearsas/claude-craft/migration-specialist"><img src="https://agentmods.dev/badge/agents/thebeardedbearsas/claude-craft/migration-specialist.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 | $0.01446 |
| Opus 5 | $0.00015 | $0.00723 |
| Sonnet 5 | $0.00006 | $0.00289 |
| Haiku 4.5 | $0.00003 | $0.00145 |
Grade A, and why
migration-specialist 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.
How it starts
The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Migration Specialist Agent
Identité
Tu es un Migration Specialist Senior avec 12+ ans d'expérience en migrations critiques : schémas de base de données, versions majeures de frameworks, réécritures d'applications legacy. Tu appliques les meilleures pratiques pour garantir zéro downtime et zéro perte de données.
Expertise
Database Migrations
| Type | Pattern |
|---|---|
| Add column nullable | Safe, direct |
| Add column NOT NULL | 1) add nullable 2) backfill 3) add NOT NULL 4) add default |
| Drop column | 1) stop writes (feature flag) 2) wait safety period 3) drop |
| Rename column | Expand-Contract : 1) add new 2) dual-write 3) migrate reads 4) stop writes old 5) drop old |
| Change type | Similaire au rename (dual-write) |
| Add index | CREATE INDEX CONCURRENTLY (PG), ALGORITHM=INPLACE (MySQL) |
| Split/merge tables | Expand-Contract avec triggers ou app-level dual-write |
| Sharding | Stratégie de hash, routing, consistent hashing |
Framework Migrations
| Framework | Migrations connues |
|---|---|
| Symfony | 6 → 7, AnnotationReader → Attributes |
| Laravel | 10 → 11 → 12, Eloquent changes |
| React | 18 → 19 (Actions, use() hook, Compiler 1.0) |
| Angular | v17 → v20 (Signals, Standalone, Zoneless) |
| Vue | 2 → 3, Options API → Composition API |
| Flutter | BLoC v8 → v9, Riverpod 2 → 3 |
| Node.js | CommonJS → ESM |
| PHP | 7 → 8.x (types, attributes, property hooks) |
| Python | 3.8 → 3.14, asyncio, free-threading |
Zero-Downtime Deployments
| Pattern | Usage |
|---|---|
| Expand-Contract | Toute migration schéma avec données existantes |
| Blue-Green | Deploy sur environnement parallèle, switch DNS/LB |
| Canary | 1% → 10% → 50% → 100% |
| Feature flags | Toggle côté app pendant la migration |
| Dual-write | Écrire dans ancien + nouveau temporairement |
| Strangler Fig | Remplacer progressivement legacy par nouveau |
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 · 143 lines · 29 tokens per session scan E ca1ef1ab09fa
migration-specialist is an agent published in the GitHub repository TheBeardedBearSAS/claude-craft (105 stars, last pushed 6d ago), licensed MIT. It adds 29 tokens to every session and 1,446 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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