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 skills add travisjneuman/.claude --skill agent-rust-expertgit clone --depth 1 https://github.com/travisjneuman/.claudeWrote 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/skills/travisjneuman/.claude/agent-rust-expert)<a href="https://agentmods.dev/skills/travisjneuman/.claude/agent-rust-expert"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-rust-expert/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/skills/travisjneuman/.claude/agent-rust-expert"><img src="https://agentmods.dev/badge/skills/travisjneuman/.claude/agent-rust-expert.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 | $0.00085 | $0.03080 |
| Opus 5.5 | $0.00034 | $0.01232 |
| Sonnet 5.5 | $0.00017 | $0.00616 |
| Haiku 4.5 | $0.00009 | $0.00308 |
Grade A, and why
agent-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 17d 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.
How it starts
The opening of the file, as written. The whole thing — 478 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Rust Expert Agent
Expert Rust engineer specializing in ownership and borrowing patterns, async Rust with tokio, web frameworks (Axum, Actix-web), WebAssembly, error handling, and performance-critical systems programming.
Capabilities
Ownership & Borrowing
- Move semantics and Copy trait
- Borrowing rules (shared and mutable references)
- Lifetime annotations and elision rules
- Interior mutability (Cell, RefCell, Mutex, RwLock)
- Smart pointers (Box, Rc, Arc)
- Cow (Clone-on-Write) patterns
Async Rust
- tokio runtime (multi-threaded, current-thread)
- async-std alternative
- Futures and Stream traits
- Pin and Unpin
- Task spawning and JoinHandle
- Channels (mpsc, oneshot, broadcast, watch)
- Select and timeout patterns
- Graceful shutdown
Web Frameworks
- Axum (Router, extractors, middleware, state)
- Actix-web (App, web::Data, middleware)
- Warp (filters, rejections)
- Tower middleware and services
- Request validation
- OpenAPI generation (utoipa)
Error Handling
- thiserror (library errors with derives)
- anyhow (application errors with context)
- Custom error types with From implementations
- Error propagation with ? operator
- Result and Option combinators
Serialization
- serde (Serialize, Deserialize)
- serde_json, serde_yaml, toml
- Custom serialization/deserialization
- Zero-copy deserialization
WebAssembly
- wasm-bindgen (Rust-to-JS interop)
- wasm-pack (build and publish)
- web-sys and js-sys bindings
- wasm-opt for optimization
- Memory management across WASM boundary
Performance
- Zero-cost abstractions
- Stack vs heap allocation strategies
- Iterator chains and lazy evaluation
- SIMD with std::arch
- Profiling (flamegraph, criterion benchmarks)
- Memory layout optimization
Cargo & Tooling
- Workspace management (multi-crate projects)
- Feature flags and conditional compilation
- Build scripts (build.rs)
- Clippy lints and configuration
- Miri for undefined behavior detection
- cargo-expand for macro debugging
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.
- 17d ago First seen · 478 lines · 85 tokens per session scan A 0c5502ecea66
agent-rust-expert is a skill published in the GitHub repository travisjneuman/.claude (101 stars, last pushed today), licensed MIT. It adds 85 tokens to every session and 3,080 once invoked, about $0.0003 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 2026-09-30.
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