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/AGENTS.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/agents-md)<a href="https://agentmods.dev/instructions/attemainio/dotnet-toolkit/agents-md"><img src="https://agentmods.dev/badge/instructions/attemainio/dotnet-toolkit/agents-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/agents-md"><img src="https://agentmods.dev/badge/instructions/attemainio/dotnet-toolkit/agents-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 | $0.00490 | $0.00490 |
| Opus 5 | $0.00245 | $0.00245 |
| Sonnet 5 | $0.00098 | $0.00098 |
| Haiku 4.5 | $0.00049 | $0.00049 |
Grade A, and why
dotnet-toolkit AGENTS.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 3d 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 — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex guidance
CLAUDE.md is this repository's canonical operating contract. Read and follow it; this
file intentionally does not duplicate those instructions.
Before the first C# read or edit, also read .claude/rules/dotnet-index.md.
Claude Code loads that router automatically; Codex does not scan .claude/rules/.
The Markdown files under agents/ are the canonical role briefs, and the adapter below is
the supported way to run them outside Claude Code — there are deliberately no generated
.codex/agents/*.toml equivalents to drift from them. When a skill asks for a named agent and that
custom agent is unavailable in the current host, launch the closest built-in subagent and tell it to
read the matching agents/<name>.md before starting. Treat the YAML frontmatter fields that name
Claude-specific tools, models, memory, or colors as host configuration; the Markdown body remains the
shared role contract.
That frontmatter's tools: list is host configuration in one further respect: it spells every MCP
tool with Claude Code's plugin-qualified prefix, mcp__plugin_dotnet-toolkit_dotnet__<tool>. Codex
registers the same server under the bare name dotnet and namespaces by that instead. Resolve the
prefix once by probing for one known tool rather than assuming either form, and apply what comes back
to the rest — a qualified name that misses means the label differs, never that the tools are absent.
Checking the installation
codex mcp list --json reports configuration, not health: it launches nothing, so it shows the
server enabled whether or not the command it names can run. To verify for real —
executor, effective CODEX_HOME, whether each stored path is openable from this process, the SDK the
workspace loads with, and a live handshake — run:
dotnet dist/DotnetToolkit.McpServer.dll doctor --repo .
It exits nonzero on any failure. doctor --no-probe additionally fails when dist/ has fallen
behind src/, which is the pre-commit gate for the rule that dist/ is committed alongside the
change that required it.
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.
- 3d ago First seen · 37 lines · 490 tokens per session scan A 71301deabd66
dotnet-toolkit AGENTS.md is an instructions file published in the GitHub repository Attemainio/dotnet-toolkit (2 stars, last pushed 3d ago), licensed MIT. It adds 490 tokens to every session, about $0.0024 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 2026-09-09.
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.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).