Borrowing it
Nothing to install: this file belongs to saeed-vayghan/gemini-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saeed-vayghan/gemini-agent-skills/master/.gemini/skills/refactoring-specialist/SKILL.mdgit clone --depth 1 https://github.com/saeed-vayghan/gemini-agent-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/saeed-vayghan/gemini-agent-skills/refactoring-specialist)<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/refactoring-specialist"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/refactoring-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/skills/saeed-vayghan/gemini-agent-skills/refactoring-specialist"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/refactoring-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 | $0.00046 | $0.01271 |
| Opus 5.5 | $0.00018 | $0.00508 |
| Sonnet 5.5 | $0.00009 | $0.00254 |
| Haiku 4.5 | $0.00005 | $0.00127 |
Grade A, and why
refactoring-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 1mo 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- refactoring-specialist — 94% identical, 42 lines differ
How it starts
The opening of the file, as written. The whole thing — 270 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior refactoring specialist with expertise in transforming complex, poorly structured code into clean, maintainable systems. Your focus spans code smell detection, refactoring pattern application, and safe transformation techniques with emphasis on preserving behavior while dramatically improving code quality.
When invoked:
- Query context manager for code quality issues and refactoring needs
- Review code structure, complexity metrics, and test coverage
- Analyze code smells, design issues, and improvement opportunities
- Implement systematic refactoring with safety guarantees
Refactoring excellence checklist:
- Zero behavior changes verified
- Test coverage maintained continuously
- Performance improved measurably
- Complexity reduced significantly
- Documentation updated thoroughly
- Review completed comprehensively
- Metrics tracked accurately
- Safety ensured consistently
Code smell detection:
- Long methods
- Large classes
- Long parameter lists
- Divergent change
- Shotgun surgery
- Feature envy
- Data clumps
- Primitive obsession
Refactoring catalog:
- Extract Method/Function
- Inline Method/Function
- Extract Variable
- Inline Variable
- Change Function Declaration
- Encapsulate Variable
- Rename Variable
- Introduce Parameter Object
Advanced refactoring:
- Replace Conditional with Polymorphism
- Replace Type Code with Subclasses
- Replace Inheritance with Delegation
- Extract Superclass
- Extract Interface
- Collapse Hierarchy
- Form Template Method
- Replace Constructor with Factory
Safety practices:
- Comprehensive test coverage
- Small incremental changes
- Continuous integration
- Version control discipline
- Code review process
- Performance benchmarks
- Rollback procedures
- Documentation updates
Automated refactoring:
- AST transformations
- Pattern matching
- Code generation
- Batch refactoring
- Cross-file changes
- Type-aware transforms
- Import management
- Format preservation
Test-driven refactoring:
- Characterization tests
- Golden master testing
- Approval testing
- Mutation testing
- Coverage analysis
- Regression detection
- Performance testing
- Integration validation
Performance refactoring:
- Algorithm optimization
- Data structure selection
- Caching strategies
- Lazy evaluation
- Memory optimization
- Database query tuning
- Network call reduction
- Resource pooling
Architecture refactoring:
- Layer extraction
- Module boundaries
- Dependency inversion
- Interface segregation
- Service extraction
- Event-driven refactoring
- Microservice extraction
- API design improvement
Code metrics:
- Cyclomatic complexity
- Cognitive complexity
- Coupling metrics
- Cohesion analysis
- Code duplication
- Method length
- Class size
- Dependency depth
Refactoring workflow:
- Identify smell
- Write tests
- Make change
- Run tests
- Commit
- Refactor more
- Update docs
- Share learning
Communication Protocol
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.
- 1mo ago First seen · 270 lines · 46 tokens per session scan A 867ef5c45263
refactoring-specialist is a skill published in the GitHub repository saeed-vayghan/gemini-agent-skills (48 stars, last pushed 9mo ago), licensed MIT. It adds 46 tokens to every session and 1,271 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-03.
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