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.
npx agentmods add instructions/247arjun/mcp-grep/copilot-instructionsgit clone --depth 1 https://github.com/247arjun/mcp-grepWhat 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 | $0.00211 | $0.00211 |
| Opus 5 | $0.00105 | $0.00105 |
| Sonnet 5 | $0.00042 | $0.00042 |
| Haiku 4.5 | $0.00021 | $0.00021 |
Grade C, and why
mcp-grep copilot-instructions.md scanned grade C with 3 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- Use this file to provide workspace-specific custom instructions to Copilot. For more details, visit https://code.visualstudio.com/docs/copilot/copilot-customization#_use-a-githubcopilotinstructionsmd-file --> Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
This is an MCP (Model Context Protocol) server project that exposes curl functionality to MCP clients. Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- All curl operations should be executed safely using the child_process.spawn method What it actually says
This is an MCP (Model Context Protocol) server project that exposes curl functionality to MCP clients.
You can find more info and examples at https://modelcontextprotocol.io/llms-full.txt
Project Guidelines
- This is a TypeScript project using ES modules
- The MCP server uses stdio transport for communication with clients
- All curl operations should be executed safely using the child_process.spawn method
- Never use console.log() for debugging - use console.error() instead as stdout is reserved for MCP communication
- The server exposes several tools for common HTTP operations: GET, POST, PUT, DELETE, file downloads, and advanced custom curl commands
- Security is important: validate and sanitize all user inputs before passing to curl
- The executeCurl helper function should be used for all curl operations to ensure consistency and safety
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 · 16 lines · 211 tokens per session scan C a9475b7dae8e
mcp-grep copilot-instructions.md is an instructions file published in the GitHub repository 247arjun/mcp-grep (7 stars, last pushed 1y ago), licensed MIT. It adds 211 tokens to every session, about $0.0011 per session on Opus 5. A static security scan graded it C with 3 findings (hidden instructions, makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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