battery-pack-rs/battery-pack/error-handling-basics

Claude Code and agent skill by battery-pack-rs/battery-pack

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Essential Rust error handling rules for anyhow and thiserror users

Install

npx vskill@latest install battery-pack-rs/battery-pack/error-handling-basics

SKILL.md

Error Handling Basics

Display must not include the source

Error reporters walk .source() separately. Including it in Display causes double-printing:

rust
// Wrong
#[error("operation failed: {0}")]
MyError(#[source] io::Error)
 
// Right
#[error("operation failed")]
MyError(#[source] io::Error)

Context describes what was attempted, not what failed

rust
// Wrong: repeats what the source error already says
.context("file not found")
 
// Right: says what you were trying to do
.context("failed to load user config")

Production backtrace config

Set RUST_BACKTRACE=1 RUST_LIB_BACKTRACE=0. This gives panic backtraces without the performance cost of capturing one on every anyhow::Error.

More guidance

For comprehensive patterns (opaque library errors, internal error composition, structured logging, custom application error types), install the error battery pack:

sh
cargo install cargo-bp
cargo bp add error

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Source

Popularity

Repository stars
78
Repository forks
12
7-day trend score
22

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