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/promptexecution/rust-cargo-docs-rag-mcp/claude-mdgit clone --depth 1 https://github.com/PromptExecution/rust-cargo-docs-rag-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/promptexecution/rust-cargo-docs-rag-mcp/claude-md)<a href="https://agentmods.dev/instructions/promptexecution/rust-cargo-docs-rag-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/promptexecution/rust-cargo-docs-rag-mcp/claude-md.svg" alt="Measured on agentmods" 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 | $0.00277 | $0.00277 |
| Opus 5 | $0.00138 | $0.00138 |
| Sonnet 5 | $0.00055 | $0.00055 |
| Haiku 4.5 | $0.00028 | $0.00028 |
Grade A, and why
rust-cargo-docs-rag-mcp 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 5d 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
CrateDocs MCP Development Guide
Build Commands
- Build project:
cargo build - Run STDIN/STDOUT server:
cargo run --bin stdio-server - Run HTTP/SSE server:
cargo run --bin axum-docs - Run tests:
cargo test - Run specific test:
cargo test test_name - Format code:
cargo fmt - Check code:
cargo clippy
Code Style Guidelines
- Naming: Use snake_case for functions/variables, CamelCase for types/structs
- Error Handling: Use
Result<T, ToolError>for functions that can fail - Imports: Organize imports by external crates first, then internal modules
- Async: Use async/await with proper error propagation using
?operator - Documentation: Include doc comments for public functions and structs
- Error Messages: Be specific and descriptive in error messages
- Caching: Implement caching for repeated operations when appropriate
- Responses: Return structured responses via
Content::text()
Project Architecture
- Implements MCP protocol for Rust documentation tools
DocRouteris the core component for handling tool requests- Uses reqwest for API requests, tokio for async runtime
- Async handlers for all tool implementations
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.
- 5d ago First seen · 26 lines · 277 tokens per session scan A 4ad6ba3d9531
rust-cargo-docs-rag-mcp CLAUDE.md is an instructions file published in the GitHub repository PromptExecution/rust-cargo-docs-rag-mcp (19 stars, last pushed 1mo ago), licensed MIT. It adds 277 tokens to every session, about $0.0014 per session on Opus 5. A static security scan graded it A with 0 findings. It comes from a forked repository.
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