Borrowing it
Nothing to install: this file belongs to niklaserik/effect-mcp. 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/niklaserik/effect-mcp/master/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/niklaserik/effect-mcpWrote 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/niklaserik/effect-mcp/copilot-instructions)<a href="https://agentmods.dev/instructions/niklaserik/effect-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/niklaserik/effect-mcp/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/niklaserik/effect-mcp/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/niklaserik/effect-mcp/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 | $0.00266 | $0.00266 |
| Opus 5.5 | $0.00106 | $0.00106 |
| Sonnet 5.5 | $0.00053 | $0.00053 |
| Haiku 4.5 | $0.00027 | $0.00027 |
Grade A, and why
effect-mcp 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 2mo 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
@niklaserik/effect-mcp Project Guidelines
Project Purpose
This project is an MCP (Model Context Protocol) server designed to fetch the most current documentation from the Effect ecosystem. Key objectives:
- Provide real-time access to Effect documentation for AI assistants
- Support both stable (
effect) and unstable/experimental (@effect/*) packages - Detect Effect imports in user code to fetch relevant documentation
- Integrate with VS Code and other MCP clients to answer documentation questions
Package Management
- Always use pnpm for package management in this project. Do not use npm or yarn.
- Use
pnpm add <package>to add dependencies - Use
pnpm add -D <package>to add dev dependencies - Use
pnpm installto install all dependencies - Use
pnpm run <script>to run scripts
Code Style
- Follow the ESLint rules configured for this project
- Use TypeScript for all new code
- Use Effect.js style patterns and practices
Project Structure
- Place source files in the
/srcdirectory - Tests should follow the naming convention
*.test.ts
Building & Running
- Use
pnpm buildto build the project - Use
pnpm devfor development with watch mode
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.
- 2mo ago First seen · 35 lines · 266 tokens per session scan A da8393200633
effect-mcp copilot-instructions.md is an instructions file published in the GitHub repository niklaserik/effect-mcp (45 stars, last pushed 8mo ago), licensed MIT. It adds 266 tokens to every session, about $0.0011 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.
effect-mcp copilot-instructions.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| effect-mcp copilot-instructions.mdniklaserik/effect-mcp | Instructions file | 45 | 8mo ago | MIT | A | 266 | GitHub Copilot |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |