rust-error-handling skillA
rust-error-handling is agent-read markdown (skill) from fusengine/agents: Use when designing Rust error handling — thiserror vs anyhow, typed error enums, #[from] conversions, or recoverable errors vs panics. Not for ownership/borrowing (rust-core-language)..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
<objective> This skill covers the thiserror-for-libraries, anyhow-for-applications split in Rust: building typed error enums with #[derive(Error)] for library APIs callers can match on, using anyhow::Result with .context()/.with_context() in application code, and zero-boilerplate error conversion via #[from]. It also covers the recoverable-errors-vs-panics decision — Result for anything a caller could reasonably recover from, panic!/unwrap/expect reserved for broken invariants — and the rule that anyhow::Error must never leak into a library's public API. Out of scope: general ownership/borrowing design belongs to rust-core-language; async-runtime-specific error handling is not covered here. </objective> # Rust Error Handling The consensus split: **thiserror for libraries, anyhow for applications.** A library exposes a typed error its callers can `match`; an application wants one ergonomic error type and rich context. Getting this boundary right is the whole discipline. ## Agent Workflow (MANDATORY) 1. **fuse-ai-pilot:explore-codebase** — is this crate a library (published API, other code depends on it) or a binary/application? That answer picks the tool. …
Read the whole file at its exact version.
How to install
mdr add fusengine/agents/rust-error-handling@git:20260729.3b91eedmdr add fusengine/agents/rust-error-handling@sha256:4fd3253bbf3464abPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_sxdudzbqhmd6ewob)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.3b91eed latest | 2026-07-29 | 3b91eed | 4,616 B | A | view · diff |
| git:20260715.2c1b77f | 2026-07-15 | 2c1b77f | 4,021 B | A | view · diff |
| git:20260705.8c2f9bc | 2026-07-05 | 8c2f9bc | 4,021 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4616 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
fusengine/agents · 28 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_sxdudzbqhmd6ewob GET https://markdownregistry.com/api/v1/resolve?ref=fusengine/agents/rust-error-handling GET https://markdownregistry.com/api/v1/blob/4fd3253bbf3464abbb6f96ded123de820ecfbd163d2a125937d0d747cea5d71e
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