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From rust-skills
Guides crate selection and integration in Rust projects, covering dependency management, feature flags, workspace layout, and language interop (C, Python, Node.js, WebAssembly).
How this skill is triggered — by the user, by Claude, or both
Slash command
/rust-skills:m11-ecosystemThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
!`grep -A 100 '^\[dependencies\]' Cargo.toml 2>/dev/null | head -30 || echo "No Cargo.toml found"`
!grep -A 100 '^\[dependencies\]' Cargo.toml 2>/dev/null | head -30 || echo "No Cargo.toml found"
Layer 2: Design Choices
What's the right crate for this job, and how should it integrate?
Before adding dependencies:
| Need | Choice | Crates |
|---|---|---|
| Serialization | Derive-based | serde, serde_json |
| Async runtime | tokio or async-std | tokio (most popular) |
| HTTP client | Ergonomic | reqwest |
| HTTP server | Modern | axum, actix-web |
| Database | SQL or ORM | sqlx, diesel |
| CLI parsing | Derive-based | clap |
| Error handling | App vs lib | anyhow, thiserror |
| Logging | Facade | tracing, log |
Before adding a dependency:
Is it well-maintained?
What's the scope?
How does it integrate?
To domain constraints (Layer 3):
"Which HTTP framework should I use?"
↑ Ask: What are the performance requirements?
↑ Check: domain-web (latency, throughput needs)
↑ Check: Team expertise (familiarity with framework)
| Question | Trace To | Ask |
|---|---|---|
| Framework choice | domain-* | What constraints matter? |
| Library vs build | domain-* | What's the deployment model? |
| API design | domain-* | Who are the consumers? |
To implementation (Layer 1):
"Integrate external crate"
↓ m04-zero-cost: Trait bounds and generics
↓ m06-error-handling: Error type compatibility
"FFI integration"
↓ unsafe-checker: Safety requirements
↓ m12-lifecycle: Resource cleanup
| Integration | Crate/Tool | Use Case |
|---|---|---|
| C/C++ → Rust | bindgen | Auto-generate bindings |
| Rust → C | cbindgen | Export C headers |
| Python ↔ Rust | pyo3 | Python extensions |
| Node.js ↔ Rust | napi-rs | Node addons |
| WebAssembly | wasm-bindgen | Browser/WASI |
| Feature | Purpose |
|---|---|
[features] | Optional functionality |
default = [...] | Default features |
feature = "serde" | Conditional deps |
[workspace] | Multi-crate projects |
| Error | Cause | Fix |
|---|---|---|
| E0433 | Can't find crate | Add to Cargo.toml |
| E0603 | Private item | Check crate docs |
| Feature not enabled | Optional feature | Enable in features |
| Version conflict | Incompatible deps | cargo update or pin |
| Duplicate types | Different crate versions | Unify in workspace |
| Criterion | Good Sign | Warning Sign |
|---|---|---|
| Maintenance | Recent commits | Years inactive |
| Community | Active issues/PRs | No response |
| Documentation | Examples, API docs | Minimal docs |
| Stability | Semantic versioning | Frequent breaking |
| Dependencies | Minimal, well-known | Heavy, obscure |
| Anti-Pattern | Why Bad | Better |
|---|---|---|
extern crate | Outdated (2018+) | Just use |
#[macro_use] | Global pollution | Explicit import |
Wildcard deps * | Unpredictable | Specific versions |
| Too many deps | Supply chain risk | Evaluate necessity |
| Vendoring everything | Maintenance burden | Trust crates.io |
| When | See |
|---|---|
| Error type design | m06-error-handling |
| Trait integration | m04-zero-cost |
| FFI safety | unsafe-checker |
| Resource management | m12-lifecycle |
npx claudepluginhub actionbook/rust-skills --plugin rust-skillsEnforces strict Rust standards including FAIL FAST error handling, workspace architecture, dependency management with version scripts, and patterns for code reviews, projects, and compilation fixes.
Guides modern Rust development with Cargo, rustc, Clippy, Rustfmt; covers ownership, borrowing, lifetimes, async Tokio, concurrency, error handling, testing, and optimization.
Assists with Cargo.toml configuration, crate dependency management, project initialization, builds, tests, benchmarks, docs, troubleshooting, and best practices for Rust projects.