Borrowing it
Nothing to install: this file belongs to dwalleck/catalyst. 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/dwalleck/catalyst/main/.claude/skills/rust-developer/SKILL.mdgit clone --depth 1 https://github.com/dwalleck/catalystWrote 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/dwalleck/catalyst/rust-developer)<a href="https://agentmods.dev/skills/dwalleck/catalyst/rust-developer"><img src="https://agentmods.dev/badge/skills/dwalleck/catalyst/rust-developer/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/dwalleck/catalyst/rust-developer"><img src="https://agentmods.dev/badge/skills/dwalleck/catalyst/rust-developer.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 | $0.00078 | $0.03413 |
| Opus 5.5 | $0.00031 | $0.01365 |
| Sonnet 5.5 | $0.00016 | $0.00683 |
| Haiku 4.5 | $0.00008 | $0.00341 |
Grade A, and why
rust-developer 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 1mo 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 — 459 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Rust Developer Guide
Purpose
Provides comprehensive Rust development best practices learned from 6 months of code reviews across the Catalyst project. Helps avoid common mistakes, write idiomatic Rust, and build safe, performant production code.
When to Use This Skill
Automatically activates when you:
- Write or modify Rust code (
.rsfiles) - Debug Rust compiler errors or warnings
- Review Rust pull requests
- Ask about Rust best practices
- Implement CLI tools or hooks
- Work with error handling, file I/O, or type safety
- Optimize Rust code for performance
- Question Rust patterns or idioms
Quick Start
New to Rust or this codebase? Start with Quick Reference Checklist - Scannable checklist of all 20+ rules
Working on specific topic? Jump to the relevant resource file below
Made a specific mistake? Check Common Footguns
Writing production code? Review Error Handling Deep Dive first
Resource Files
Quick Reference (Start Here)
quick-reference.md - 400-line scannable checklist
- All 20+ lessons in one place
- Rule + Quick check + Example + Link to deep dive
- Perfect for code review or quick lookup
- Can be scanned in under 2 minutes
Additional Patterns
rust-patterns.md - ~555 lines
When to use:
- Choosing between thiserror and anyhow
- Input validation at boundaries
- Concurrent database access
- Preventing SQL injection
- Ownership patterns (borrow vs owned)
- Testing error paths
Topics covered:
- thiserror vs anyhow (when to use each)
- Input validation with validator crate
- Arc<Mutex> for thread-safe shared state
- Parameterized queries for SQL injection prevention
- Ownership patterns (borrow params, return owned)
- Testing error paths explicitly
- Match-based error classification
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 459 lines · 78 tokens per session scan A 8a1d0bf6930f
rust-developer is a skill published in the GitHub repository dwalleck/catalyst (11 stars, last pushed 11mo ago), licensed MIT. It adds 78 tokens to every session and 3,413 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 2026-08-30.
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