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refactor

refactor is a skill for Claude Code from darylmcd/Roslyn-Backed-MCP. It costs 50 tokens per session (2,163 once invoked), scanned A, original, MIT.

A guided tool for changing the structure and names of C# code. It uses Roslyn, Microsoft's C# code-analysis framework, to preview and apply refactorings.

In plain words
What is it for?
Use it to rename symbols, extract interfaces or types, move types, split classes, and replace types in bulk. Describe the desired change in plain language.
Why use it?
It helps avoid missing references or introducing compile errors when changing code across files or projects.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

Part of the roslyn-mcp plugin — 44 skills, 5 agents, 2 hooks, 2 MCP servers shipped together

not rated 1repo today A scan 50 tokens original MIT

Good fit Use it to rename symbols, extract interfaces or types, move types, split classes, and replace types in bulk. Describe the desired change in plain language.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/darylmcd/roslyn-backed-mcp/refactor
View source ↗ darylmcd/Roslyn-Backed-MCP
Install

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.

Any agent
npx skills add darylmcd/Roslyn-Backed-MCP --skill refactor
Clone the repo
git clone --depth 1 https://github.com/darylmcd/Roslyn-Backed-MCP

Made for: Claude Code.

Or install roslyn-mcp, the plugin that ships this one along with the rest of its 44 skills, 5 agents, 2 hooks, 2 MCP servers.

Wrote 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.

agentmods badge for refactor

README.md
[![agentmods](https://agentmods.dev/badge/skills/darylmcd/roslyn-backed-mcp/refactor.svg)](https://agentmods.dev/skills/darylmcd/roslyn-backed-mcp/refactor)
Your own site
<a href="https://agentmods.dev/skills/darylmcd/roslyn-backed-mcp/refactor"><img src="https://agentmods.dev/badge/skills/darylmcd/roslyn-backed-mcp/refactor.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,163 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00050 $0.02163
Opus 5 $0.00025 $0.01081
Sonnet 5 $0.00010 $0.00433
Haiku 4.5 $0.00005 $0.00216

Measured 7d ago against content hash 103835f8e249, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

refactor 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 7d 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.

skills/refactor/SKILL.md · 149 lines

How it starts

The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Guided Semantic Refactoring

You are a C# refactoring specialist. Your job is to interpret the user's refactoring intent, find the relevant symbols, assess impact, execute the refactoring using Roslyn's preview/apply workflow, and verify the result compiles.

Input

$ARGUMENTS is a natural-language description of what the user wants to refactor. Examples:

  • "Rename GetUser to GetUserAsync in the UserService"
  • "Extract an interface from OrderProcessor"
  • "Move PaymentHandler to the Infrastructure project"
  • "Split the GodClass into smaller types"

Workspace auto-probe (run before anything else):

  1. Glob CWD (depth=1) for *.slnx, *.sln, and *.csproj.
    • If zero hits: set applicable: false, note "Not a C# repo — skipping workspace load", and continue with the rest of this skill as a best-effort text-based session.
  2. On a positive hit, check whether a workspace is already loaded (call workspace_list or inspect the session context). If already loaded, do NOT reload.
  3. If not yet loaded, call workspace_load with the found path. Prefer .slnx > .sln > bare .csproj when multiple exist.
  4. Surface the following recommended-tool block for this session:
    • find_references — find all callers of a symbol
    • find_consumers — find all callers of a type/member across projects
    • find_implementations — find concrete implementations of an interface/abstract member
    • compile_check — verify the solution compiles after each meaningful edit
    • validate_workspace — post-mutation gate: compile + diagnostics + related tests

Server discovery

Use server_info, resource roslyn://server/catalog, or MCP prompt discover_capabilities (refactoring or all) for the live tool list and WorkflowHints (preview/apply, code actions, interface extraction, etc.).

For extract method with a concrete selection, MCP prompt guided_extract_method can prime the workflow.

Safety Rules

  1. Always preview before applying. Never call an *_apply tool without first calling and showing the corresponding *_preview.
  2. Always verify after applying. Run compile_check after every applied refactoring.
  3. Ask for confirmation before applying changes that affect more than 5 files.
  4. One refactoring at a time. Complete and verify each refactoring before starting the next.

Read the full file on GitHub · 149 lines

Changes

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.

  1. 7d ago First seen · 149 lines · 50 tokens per session scan A 103835f8e249

Subscribe to this mod's changes

refactor is a skill published in the GitHub repository darylmcd/Roslyn-Backed-MCP (1 stars, last pushed today), licensed MIT. It adds 50 tokens to every session and 2,163 once invoked, about $0.0003 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.

C# and .NETLanguages
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