Borrowing it
Nothing to install: this file belongs to Attemainio/dotnet-toolkit. 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/Attemainio/dotnet-toolkit/main/CLAUDE.mdgit clone --depth 1 https://github.com/Attemainio/dotnet-toolkitWrote 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/instructions/attemainio/dotnet-toolkit/claude-md)<a href="https://agentmods.dev/instructions/attemainio/dotnet-toolkit/claude-md"><img src="https://agentmods.dev/badge/instructions/attemainio/dotnet-toolkit/claude-md/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/instructions/attemainio/dotnet-toolkit/claude-md"><img src="https://agentmods.dev/badge/instructions/attemainio/dotnet-toolkit/claude-md.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 | $0.02172 | $0.02172 |
| Opus 5.5 | $0.00869 | $0.00869 |
| Sonnet 5.5 | $0.00434 | $0.00434 |
| Haiku 4.5 | $0.00217 | $0.00217 |
Grade A, and why
dotnet-toolkit CLAUDE.md 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.
How it starts
The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
Guidance for Claude Code when working in this repository. This file is the operating contract: the rules that apply in every session, plus where to read the detail. It is not the repo's manual — anything needed only for a particular kind of task lives behind a pointer below.
What this is
A Claude Code plugin for .NET repositories: a Roslyn-powered MCP server (DotnetToolkit.McpServer)
exposing token-efficient symbol location, navigation and relationship tools, plus skills that teach
Claude to locate with these tools, read only the located range, and edit with Edit/Write while a
hook keeps the index current. This repo is both the plugin's implementation and (via .mcp.json) a
live consumer of its own server. Dogfooding is the point: if a tool is awkward or wrong for a real
task here, that's a bug report about the tool, not a reason to fall back to shell.
Non-negotiable workflow
.claude/rules/dotnet-index.md is a router and nothing else: it names no tools, and maps an
intent (read C#, write C#, explore, review) to the skill that owns it. It is always-loaded alongside
this file, and is the same rule dotnet-init copies into consuming repos.
The protocol itself lives one level down, loaded only when the work needs it:
| Owns | File |
|---|---|
Every retrieval tool, what each answers, the cheap-route table, limitedBy, TOON |
skills/dotnet-read/SKILL.md |
The write path (Edit/Write on located text, rename_symbol), the standards step, how the index follows edits, failures |
skills/dotnet-write/SKILL.md |
Briefing and launching the dotnet-explore agent |
skills/dotnet-explore/SKILL.md |
Partitioning and launching dotnet-code-review |
skills/dotnet-review/SKILL.md |
| Which coding standard applies when — shared by the writer and the reviewer | standards/index.md |
None of it is repeated in CLAUDE.md: a rule that lives only here never reaches a consumer, and two
copies always diverge.
What this repo adds on top, because it is the plugin's own source tree:
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 Changed · -47 lines · -920 tokens per session 063c399b4432
- 1mo ago Changed · +28 lines · +599 tokens per session 9765471eda00
- 1mo ago First seen · 152 lines · 2,493 tokens per session scan A 8d9b45c4725e
dotnet-toolkit CLAUDE.md is an instructions file published in the GitHub repository Attemainio/dotnet-toolkit (2 stars, last pushed 1mo ago), licensed MIT. It adds 2,172 tokens to every session, about $0.0087 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 2026-08-31.
Other instructions, from other repositories
plan-forge api-patterns.instructions.md
API patterns for .NET — REST conventions, ProblemDetails, pagination, versioning, error responses.
plan-forge errorhandling.instructions.md
Error handling patterns — Exception hierarchy, ProblemDetails responses, error boundaries, global exception middleware.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.