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Cargo Feature Metadata Aggregation Service + CLI Tool

A specialized web service that crawls crate repositories (GitHub, docs.rs), extracts feature documentation, examples, and dependency trees, then exposes this via a fast CLI tool (`cargo-features-lookup`) and a queryable API. Developers run `cargo features tokio` and get a formatted table of features with use-cases, dependencies, and example code snippets—no browser needed.

SERVICE

15 weeks • 70% confidence

Value Proposition

Provides richer feature context than crates.io (actual usage examples, real-world feature combos, deprecation warnings) in a CLI-first, offline-capable format. Scales to enterprise teams via API licensing. Integrates into CI/CD to validate feature selections before merge. Beats browser-based docs lookup by 10x for bulk lookups or scripted workflows.

Target Audience

Rust developers, teams, and CI/CD pipelines that need offline-capable, scriptable feature lookups; also dev tool companies (IDE makers, Cargo plugin ecosystems) that want to license feature data

Key Features

  • CLI tool showing features, descriptions, example code, and compatibility matrix in formatted table
  • REST API for programmatic feature queries (used by CI/CD, internal tools, other IDE plugins)
  • Offline-first: CLI caches feature data locally; syncs weekly or on-demand
  • And more, with full implementation detail...

Tech Stack

Rust (CLI tool) Actix or Axum (REST API) PostgreSQL (feature metadata storage) SQLite (local CLI cache)
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Original Problem

Rust developers waste time manually discovering available features in crate dependencies

Rust developers adding dependencies to Cargo.toml must manually read source code or documentation to discover what optional features are available in a crate, creating friction in the development workflow. Current IDE tooling like Dependi provides version suggestions but completely lacks feature discovery, forcing developers to context-switch away from their editor to research dependencies.

Score: 17.5%