rust-ecosystem
Skill0 starsChanged 43 days agoMITView on GitHub
Choosing Rust crates with verified current versions. Use when adding a dependency or running cargo add, asking "which crate for X" or "what's the best Rust library for Y", comparing crates (axum vs actix-web, sqlx vs diesel vs sea-orm, jiff vs chrono, reqwest vs ureq), replacing deprecated or unmaintained crates (lazy_static, once_cell, structopt, failure, async-std, serde_yaml, bincode, atty, dotenv...), reviewing or writing Cargo.toml dependencies, versions and features, or picking crates for web, HTTP, async, serialization, databases, CLI/TUI, logging/tracing, testing, crypto/TLS, GUI, wasm, embedded, ML/data or FFI.
- Reads credentials
- Installs packages
2 other projects use a version of this.
Adopted by
Most recently taken up by
- adxptived/Rust-Skillstheir own version, first seen Oct 17, 2026
- huiali/rust-skillstheir own version, first seen Feb 9, 2026
Other versions2 projects use a version of this.
Word for word · 0
None found.
Edited · 0
None found.
Wrote their own version · 2
- huiali/rust-skills★ 47same name
- adxptived/Rust-Skills★ 1same name
How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.
In this repository4 other files it gives its agents.
- CLAUDE.mdCLAUDE.md
- rust-architectureSkill
- rust-idiomsSkill
- rust-securitySkill
The file
We split this skill into the rules it gives an agent
2 rules. About 0 are common, 1 is distinctive, and 1 is very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈1
Distinctive · estimate
This author's own choices. Worth a look.
1
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Distinctive: line 27
When these tools are available, prefer them over the static versions in this skill.
- Very specific: line 110
Before using any crate, check it is not tier = "avoid".
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
Rust ecosystem: which crate, which version
Agents fail here in predictable ways: an old major version typed from memory, a deprecated crate from old training data, a crate std has replaced, or every default feature switched on. This skill gives the current default per domain, verified against crates.io, GitHub and RustSec on 2026-09-29 (Rust 1.96, edition 2024).
catalog.toml (in this skill) is the machine-readable catalog: about 200 crates with
category, tier (default / recommended / situational / avoid), verified version,
use_for, avoid_when, alternatives and replaces. The rustkb MCP server reads it.
recommend_crates— ranked catalog entries for a need, with live crates.io versions.crate_info— one crate's catalog entry, live version, maintenance and advisory status.check_advisories— RustSec advisories for a crate or lockfile.search/get_item— versioned API docs for tracked crates. When these tools are available, prefer them over the static versions in this skill.
Core rules
| ID | Rule |
| DEP-01 | Check std first: LazyLock/OnceLock, IsTerminal, available_parallelism, thread::scope, File::lock, cfg_select!, native async fn in traits |
| DEP-03 | Check maintenance before recommending: RustSec advisory, last release, archived repo |
| DEP-04 | Pick the catalog's tier = "default" crate unless you can state a reason |
| DEP-05 | Write versions as caret "MAJOR.MINOR"; commit Cargo.lock |
| DEP-06 | Enable only the features you use; libraries set default-features = false on heavy deps |
| DEP-07 | Check rust-version (MSRV) of new deps against yours |
| DEP-11 | Never type a version from memory: cargo add, crate_info, or crates.io |
| DEP-12 | Replace avoid-tier crates when you touch the code that uses them |
| NET-01 | Async runtime: tokio; never async-std (discontinued) |
| WEB-01 | Web server: axum + tower-http; HTTP client: reqwest (async, rustls by default since 0.13) or ureq (sync) |
| SER-03 | YAML: serde-saphyr (serde_yaml deprecated, serde_yml unsound) |
| SER-04 | Binary serde: postcard (bincode discontinued; 3.0.0 is a compile-error tombstone) |
| DB-01 | SQL: sqlx (raw SQL, checked); diesel or sea-orm when you want an ORM/DSL |
| TXT-01 | Date/time: jiff for new code; chrono where APIs require it; never Local::now() in servers |
| TEL-01 | Instrumentation: tracing + tracing-subscriber; OTel crates all on one minor |
| UTIL-01 | Errors: thiserror in libraries, anyhow at application edges |
| UTIL-07 | rand 0.10: rand::rng(), random_range, use rand::RngExt |
| TST-07 | Test runner: cargo-nextest (+ cargo test --doc); coverage: cargo-llvm-cov |
| DOM-01 | TLS: rustls (aws-lc-rs provider); openssl only when mandated |
Current defaults at a glance (verified 2026-09-29)
| Need | Default | Version |
| Async runtime | tokio | 1.53 |
| Web framework / middleware | axum / tower-http | 0.8 / 0.7 |
| HTTP client async / sync | reqwest / ureq | 0.13 / 3.4 |
| gRPC | tonic + prost (codegen: tonic-prost-build) | 0.14 / 0.14 |
| Serialization | serde + serde_json | 1.0 / 1.0 |
| TOML / YAML | toml / serde-saphyr | 1.1 / 1.3 |
| SQL / SQLite | sqlx / rusqlite | 0.9 / 0.40 |
| CLI / TUI | clap (derive) / ratatui | 4.6 / 0.30 |
| Errors | thiserror / anyhow | 2.0 / 1.0 |
| Logging & tracing | tracing / tracing-subscriber | 0.1 / 0.3 |
| Date & time | jiff | 0.2 |
| Parsing | winnow | 1.0 |
| Parallelism | rayon | 1.12 |
| Testing | proptest / insta / rstest | 1.11 / 1.48 / 0.27 |
| TLS | rustls | 0.23 |
| Proc macros | syn / quote | 3.0 / 1.0 |
Routing: which reference to read
| Situation | Read |
| Should I add this crate? Evaluating maintenance, features, MSRV, license; std replacements | references/dependency-policy.md |
| Crate is old/deprecated/unmaintained; migration targets; stale APIs agents write from memory | references/deprecated-and-replacements.md |
| tokio, futures, cancellation, channels, retries, WebSockets, gRPC, QUIC, DNS, brokers | references/async-and-networking.md |
| Web server, middleware, OpenAPI, sessions/JWT, HTTP clients, email | references/web-and-http.md |
| serde, JSON/TOML/YAML/binary formats, CSV/XML/protobuf, config loading, .env | references/data-and-serialization.md |
| Dates/times/time zones, regex, parsing (winnow/nom/pest/logos), Unicode, Markdown, templates | references/text-time-and-parsing.md |
| SQL toolkits/ORMs, SQLite, Redis, MongoDB, embedded KV, pools, caches | references/databases.md |
| CLI parsing, colours, prompts, progress, config dirs, TUIs | references/cli-and-tui.md |
| tracing, log, OpenTelemetry, metrics, Sentry, tokio-console | references/observability-crates.md |
| Error crates, rayon, locks/concurrent maps, collections, hashing, rand, UUIDs, proc-macro tooling | references/core-utilities.md |
| Property/snapshot/parameterized tests, mocks, HTTP fakes, nextest, coverage, benchmarks, profiling | references/testing-and-benchmarking.md |
| TLS/crypto pointers, GUI, wasm, embedded, data/ML, FFI (pyo3, napi, cxx, bindgen), cloud, files | references/domain-specific.md |
| A crate not covered above | catalog.toml, then recommend_crates / crate_info |
Related skills
rust-idioms— how to use std and the language well (errors, async, concurrency, testing style).rust-architecture— workspaces, service/CLI structure, config and observability design, CI.rust-security— supply-chain policy (cargo-deny/vet), crypto choices in depth, unsafe review, fuzzing.
Using the catalog directly
[[crate]]
name = "serde-saphyr"
category = "serialization"
tier = "default" # default | recommended | situational | avoid
version = "1.3" # crates.io major.minor at verification time
replaces = ["serde_yaml", "serde_yml"]- To find the default for a category: filter
tier = "default"andcategory. - Before using any crate, check it is not
tier = "avoid"; if it is, use itsalternatives. category = "tool"entries are cargo subcommands to install (cargo install/cargo binstall), never[dependencies].- Versions drift: the catalog records what was current on the verification date; live
versions come from
crate_infoor crates.io.
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Your trail
Files you open will collect here, so you can find them again.
Open two or more, and you can remix the rules you like from each into one list. Kept in this browser only.
Now do this for your own.
Bring your CLAUDE.md, AGENTS.md or skills. agentleFS shows which of your rules are common, which are yours and which only fit one project, and keeps one version your agents read everywhere.