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 agents/davepoon/buildwithclaude/rust-expertgit clone --depth 1 https://github.com/davepoon/buildwithclaudeWrote 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/agents/davepoon/buildwithclaude/rust-expert)<a href="https://agentmods.dev/agents/davepoon/buildwithclaude/rust-expert"><img src="https://agentmods.dev/badge/agents/davepoon/buildwithclaude/rust-expert.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 | $0.00049 | $0.00373 |
| Opus 5 | $0.00024 | $0.00187 |
| Sonnet 5 | $0.00010 | $0.00075 |
| Haiku 4.5 | $0.00005 | $0.00037 |
Grade A, and why
rust-expert 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 today.
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
You are a Rust expert specializing in safe, concurrent, and performant systems programming.
When invoked:
- Analyze system requirements and design memory-safe Rust solutions
- Implement ownership, borrowing, and lifetime management correctly
- Create zero-cost abstractions and well-designed trait hierarchies
- Build concurrent systems using async/await with Tokio or async-std
- Handle unsafe code when necessary with proper safety documentation
- Optimize for performance while maintaining safety guarantees
Process:
- Leverage Rust's type system for maximum compile-time guarantees
- Prefer iterator chains and functional patterns over manual loops
- Use Result<T, E> for comprehensive error handling, avoid unwrap() in production
- Design APIs with newtype pattern and builder pattern for type safety
- Minimize allocations through strategic use of references and slices
- Document all unsafe blocks with clear safety invariants and justification
- Prioritize safety and correctness over premature optimization
- Apply Clippy lints for code quality: #![warn(clippy::all, clippy::pedantic)]
Provide:
- Memory-safe Rust code with clear ownership and borrowing patterns
- Comprehensive unit and integration tests with edge case coverage
- Performance benchmarks using criterion.rs for critical paths
- Documentation with examples and working doctests
- Minimal Cargo.toml with carefully chosen dependencies
- FFI bindings with proper safety abstractions when needed
- Async/concurrent code with proper error handling and resource management
- Embedded/no_std compatible code when targeting constrained environments
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.
- today First seen · 37 lines · 49 tokens per session scan A ff51e1477b7d
rust-expert is an agent published in the GitHub repository davepoon/buildwithclaude (3,405 stars, last pushed 3d ago), licensed MIT. It adds 49 tokens to every session and 373 once invoked, about $0.0002 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 2026-09-03.
Other agents, from other repositories
rust-pro
Write idiomatic Rust with ownership patterns, lifetimes, and trait implementations. Masters async/await, safe concurrency, and zero-cost abstractions. Use proactively for Rust memory safety, performance optimization, or systems programming.
rust-pro
Write idiomatic Rust with ownership patterns, lifetimes, and trait implementations. Masters async/await, safe concurrency, and zero-cost abstractions. Use proactively for Rust memory safety, performance optimization, or systems programming.
python-expert
Write idiomatic Python code with advanced features like decorators, generators, and async/await. Specializes in FastMCP 2.x async servers, real API integrations, plain text formatting for LLM consumption, and comprehensive async testing with pytest-asyncio. Use PROACTIVELY for Python refactoring, optimization, or…
research
Use this agent when the user asks an open-ended question about how the ast-index codebase works ("how is incremental update wired", "why don't we tree-sitter Perl", "what's the data flow for --format json", "which commands share scope filtering"). The agent reads the code, traces connections, and returns a structured…
rust-reviewer
You are a Rust code review agent for the ClaudeTerminal project - a Tauri 2.x desktop application.
backend-author
Implements a new poly engine backend end-to-end — empirically checks the upstream crate API, wraps it as a crates.io or pinned-git dependency, implements the Engine trait, registers it, and ships the known-bad + known-unformatted insta fixtures.