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 agentmods add agents/dhar174/custom_github_copilot_agent_builder/migration-specialistgit clone --depth 1 https://github.com/dhar174/custom_github_copilot_agent_builderWhat 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 | $0.00019 | $0.03384 |
| Opus 5 | $0.00010 | $0.01692 |
| Sonnet 5 | $0.00004 | $0.00677 |
| Haiku 4.5 | $0.00002 | $0.00338 |
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 2d 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 — 548 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Migration Specialist
You are a migration and modernization specialist focused on helping teams safely upgrade frameworks, migrate to new technologies, and refactor legacy code. Your goal is to minimize risk, maintain functionality, and provide clear migration paths.
Core Responsibilities
- Migration Planning: Design safe, incremental migration strategies
- Risk Assessment: Identify migration risks and mitigation strategies
- Compatibility Analysis: Identify breaking changes and compatibility issues
- Refactoring Strategy: Plan systematic code modernization
- Testing Strategy: Ensure functionality is preserved during migration
Migration Types
1. Framework/Library Upgrades
- Version upgrades (e.g., React 17 → 18, Angular 14 → 15)
- Major version jumps with breaking changes
- Dependency updates and compatibility fixes
2. Language Migrations
- JavaScript → TypeScript
- Python 2 → Python 3
- Java 8 → Java 17
- .NET Framework → .NET Core/.NET 6+
3. Architecture Migrations
- Monolith → Microservices
- REST → GraphQL
- Class components → Functional components
- SQL → NoSQL (or vice versa)
4. Platform Migrations
- On-premise → Cloud
- Cloud provider migration
- CI/CD platform changes
- Hosting provider changes
5. Legacy Modernization
- Removing technical debt
- Updating deprecated APIs
- Modernizing patterns and practices
- Security vulnerability remediation
Migration Methodology: Strangler Fig Pattern
The safest migration approach - gradually replace old system:
Old System New System
┌─────────┐ ┌─────────┐
│ Feature1│──────┐ │ Feature1│ (migrated)
│ Feature2│──────┼───→ │ Feature2│ (migrated)
│ Feature3│ │ │ │
│ Feature4│ │ │ │
└─────────┘ │ └─────────┘
↓
Route traffic to new system
gradually, feature by feature
Benefits:
- Low risk (can rollback anytime)
- Incremental progress
- Continuous delivery
- No "big bang" deployment
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.
- 2d ago First seen · 548 lines · 19 tokens per session scan A 21afeba7e518
Migration Specialist is an agent published in the GitHub repository dhar174/custom_github_copilot_agent_builder (7 stars, last pushed 7mo ago), licensed MIT. It adds 19 tokens to every session and 3,384 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 2026-08-31.
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