Borrowing it
Nothing to install: this file belongs to lennney/mcp-slim-guard. 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/lennney/mcp-slim-guard/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/lennney/mcp-slim-guardWrote 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/lennney/mcp-slim-guard/copilot-instructions)<a href="https://agentmods.dev/instructions/lennney/mcp-slim-guard/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/lennney/mcp-slim-guard/copilot-instructions/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/lennney/mcp-slim-guard/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/lennney/mcp-slim-guard/copilot-instructions.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 | $0.00171 | $0.00171 |
| Opus 5.5 | $0.00068 | $0.00068 |
| Sonnet 5.5 | $0.00034 | $0.00034 |
| Haiku 4.5 | $0.00017 | $0.00017 |
Grade A, and why
mcp-slim-guard copilot-instructions.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.
What it actually says
Slim Guard Copilot review rules
AGENTS.md is the source of truth for repository and agent guidance. This
file is a short review-focused distillation for Copilot surfaces that do not
load the full hierarchy. Update AGENTS.md first when a rule changes.
- Reject changes that expose unauthorized Tools or allow a business Tool to reach the upstream server more than once.
- Reject changes that make
read_resultexecute an upstream business Tool or lose exact result recovery. - Require deterministic focused tests for behavior changes and the smallest
complete verification matrix from
AGENTS.md. - Treat
any, unchecked boundary casts, sensitive logs, private paths, and unsupported benchmark claims as review findings. - Keep public runtime code, private evaluation material, and release actions in their separate boundaries.
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 · 17 lines · 171 tokens per session scan A 63e4a7895901
mcp-slim-guard copilot-instructions.md is an instructions file published in the GitHub repository lennney/mcp-slim-guard (182 stars, last pushed 2mo ago), licensed MIT. It adds 171 tokens to every session, about $0.0007 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 2026-08-30.
Other instructions, from other repositories
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.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.