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Detect unused dependencies in Rust projects for cleaner Cargo.toml files and faster builds. Use when auditing dependencies, optimizing build times, cleaning up Cargo.toml, or detecting bloat. Trigger terms: unused dependencies, cargo-machete, dependency audit, dependency cleanup, bloat detection, cargo-udeps.
Agent-facing interface to the Lago knowledge substrate. Provides Karpathy-style wiki operations (ingest, search, read, write, lint, wake-up, query) on top of Lago's event-sourced, content-addressed filesystem.
Create and maintain a control-system metalayer for autonomous code-agent development in any repository. Use when you need explicit control primitives (setpoints, sensors, controller policy, actuators, feedback loop, stability and entropy controls), repo command/rule governance, and a scalable folder topology that lets agents operate safely and keep improving over time.
Build or modify aiOS control-plane HTTP/SSE behavior. Use when changing apps/aios-api routes, request/response models, streaming/replay semantics, approval endpoints, or API compatibility guarantees.
Evolve core aiOS kernel behavior and contracts. Use when modifying crates aios-model, aios-events, aios-policy, aios-tools, aios-memory, aios-runtime, or aios-kernel, especially for event schema, lifecycle phases, capability checks, checkpoints, memory provenance, or session semantics.
Prepare aiOS for production release and distribution. Use when hardening CI/CD, observability, security boundaries, packaging, deployment, rollback strategy, and operational readiness.
Run full workspace validation (format, lint, build, test)
| model | haiku |
| created | "2025-12-16T00:00:00.000Z" |
| modified | "2026-02-11T00:00:00.000Z" |
| reviewed | "2025-12-16T00:00:00.000Z" |
| name | cargo-machete |
| description | Detect unused dependencies in Rust projects for cleaner Cargo.toml files and faster builds. Use when auditing dependencies, optimizing build times, cleaning up Cargo.toml, or detecting bloat. Trigger terms: unused dependencies, cargo-machete, dependency audit, dependency cleanup, bloat detection, cargo-udeps. |
| allowed-tools | Bash, Read, Grep, Glob |
Detect and remove unused dependencies in Rust projects using cargo-machete.
| Use this skill when... | Use X instead when... |
|---|---|
| Auditing for unused dependencies | Checking for outdated deps -- use cargo outdated |
| Cleaning up Cargo.toml | Auditing security vulnerabilities -- use cargo audit |
| Optimizing build times by removing bloat | Checking license compliance -- use cargo deny |
| Verifying deps in CI | Need nightly-accurate analysis -- use cargo +nightly udeps |
test -f Cargo.toml && echo "EXISTS" || echo "MISSING"grep -q '\[workspace\]' Cargo.toml 2>/dev/null && echo "YES" || echo "NO"cargo machete --version 2>/dev/null || echo "NOT INSTALLED"test -f .cargo-machete.toml && echo "EXISTS" || echo "MISSING"grep -A 20 '^\[workspace\]' Cargo.toml 2>/dev/null | grep -o '"[^"]*"' 2>/dev/nullExecute this unused dependency analysis:
Check if cargo-machete is installed (see Context above). If not installed, install it:
cargo install cargo-machete
Run cargo-machete with metadata for detailed output:
# Single crate
cargo machete --with-metadata
# Workspace (if Context shows workspace)
cargo machete --workspace --with-metadata
Review the output and classify each finding:
| Finding | Action |
|---|---|
| Genuinely unused dependency | Remove with --fix or manually |
| Proc-macro dependency (e.g., serde derive) | Add machete:ignore comment |
| Build.rs-only dependency | Move to [build-dependencies] |
| Re-exported dependency | Add machete:ignore comment with explanation |
For confirmed unused dependencies, auto-remove them:
cargo machete --fix
For false positives, add ignore annotations in Cargo.toml:
serde = "1.0" # machete:ignore - used via derive macro
Or create .cargo-machete.toml for project-wide ignores:
[ignore]
dependencies = ["serde", "log"]
After removing dependencies, confirm everything still compiles:
cargo check --all-targets
cargo test --no-run
| Scenario | Solution |
|---|---|
| Proc-macro deps (e.g., serde derive) | machete:ignore comment |
| Build.rs-only deps | Move to [build-dependencies] |
| Re-exported deps | machete:ignore comment with explanation |
| Example/bench-only deps | Verify in [dev-dependencies] |
| Feature | cargo-machete | cargo-udeps |
|---|---|---|
| Accuracy | Good | Excellent |
| Speed | Very fast | Slower |
| Rust version | Stable | Requires nightly |
| False positives | Some | Fewer |
Use cargo-machete for fast CI checks. Use cargo-udeps for thorough audits:
cargo +nightly udeps --workspace --all-features
| Context | Command |
|---|---|
| Quick check | cargo machete |
| Detailed check | cargo machete --with-metadata |
| Workspace check | cargo machete --workspace --with-metadata |
| Auto-fix | cargo machete --fix |
| Verify after fix | cargo check --all-targets |
| Accurate check (nightly) | cargo +nightly udeps --workspace |
| Flag | Description |
|---|---|
--with-metadata | Show detailed output with versions and locations |
--fix | Auto-remove unused dependencies from Cargo.toml |
--workspace | Check all workspace members |
-p <crate> | Check specific workspace member |
--exclude <crate> | Exclude specific workspace member |
| Problem | Solution |
|---|---|
| Proc macro flagged as unused | Add machete:ignore comment in Cargo.toml |
| Build.rs dep flagged | Move to [build-dependencies] |
| Re-exported dep flagged | Add machete:ignore with explanation |
| Need more accuracy | Use cargo +nightly udeps |
For CI integration patterns, configuration file examples, pre-commit setup, and Makefile integration, see REFERENCE.md.