aigent: Instructions file for Claude Code

aigent — Development Guide

Overview

Rust library + CLI + Claude Code plugin for managing AI agent skill definitions (SKILL.md files). Implements the Anthropic agent skill specification.

Project Structure

src/
├── lib.rs          # Library root — re-exports public API
├── errors.rs       # Error types (thiserror)
├── models.rs       # SkillProperties (serde)
├── parser.rs       # SKILL.md frontmatter parser (serde_yaml_ng)
├── validator.rs    # Metadata & directory validator
├── prompt.rs       # XML prompt generation
├── builder.rs      # Skill builder (deterministic + LLM)
└── main.rs         # CLI entry point (clap)

Commands

cargo build                         # Build debug
cargo build --release               # Build release
cargo test                          # Run all tests
cargo clippy -- -D warnings         # Lint (warnings = errors)
cargo fmt                           # Format code
cargo fmt --check                   # Check formatting

Architecture

• Error handling: thiserror enum AigentError with Result<T> alias. No unwrap() in library code.
• Serialization: serde derive macros for YAML/JSON. #[serde(rename)] for kebab-case fields.
• CLI: clap derive macros with #[command(subcommand)].
• Unicode: unicode-normalization crate for NFKC.
• Version: compile-time env!("CARGO_PKG_VERSION"), single source of truth in Cargo.toml.

Coding Conventions

• Idiomatic Rust: use Result<T, E>, pattern matching, iterators
• No unwrap() or expect() in src/lib.rs and modules — propagate errors with ?
• expect() allowed in static initializers (e.g., LazyLock<Regex>) for compile-time invariants
• unwrap() allowed in tests and main.rs for known-safe operations
• #[must_use] on functions returning values that shouldn't be ignored
• Public items must have doc comments (///)

Milestones

Project tracked at: https://github.com/users/wkusnierczyk/projects/39