Rust Error Observability

What it does

When your agent uses it

• Reviewing Rust service error handling and observability
• Especially when separating domain errors from HTTP responses
• Adding thiserror/anyhow
• Implementing ResponseError

Example prompts

• “/rust-error-observability”

Requirements

• Compatibility (from SKILL.md): Codex, Claude Code, and other Agent Skills-compatible clients.

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

1. 1Inventory error flows: handler return types, service/repository errors,
2. 2Classify each error by purpose
3. 3Keep domain errors typed. Use thiserror for expected branches that callers
4. 4Add context at infrastructure boundaries. Use anyhow or opaque application
5. 5Map errors to HTTP responses in one place per framework: ResponseError,
6. 6Add structured spans before more log lines. Include stable diagnostic fields,
7. 7Ensure errors are logged once. Prefer logging at the outer boundary where
8. 8Test both the public response and the diagnostic path when behavior changed.

What it can do on your machine

Read from SKILL.md and the folder at commit 16b4156. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are rust).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Codex, Claude Code, and other Agent Skills-compatible clients.

  From compatibility in the SKILL.md frontmatter.

Context cost

Rust Error Observability loads about 969 tokens when it runs, and up to ~2.4k if it reads all its reference files. Until then it costs about 81 tokens; SKILL.md has 375 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~81

When it runs · the whole SKILL.md, loaded when a task matches

~969

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hashgraph-online/awesome-codex-plugins at commit 16b4156, republished under its MIT licence (© hashgraph-online). 375 words, ~969 tokens.

name

rust-error-observability

description

Use when adding, changing, debugging, or reviewing Rust service error handling and observability, especially when separating domain errors from HTTP responses, adding thiserror/anyhow, implementing ResponseError or IntoResponse, adding tracing spans, redacting secrets, or diagnosing async failures.

compatibility

Codex, Claude Code, and other Agent Skills-compatible clients.

license

MIT

metadata.version

0.1.0

metadata.displayName

Rust Error Observability

metadata.category

Rust

metadata.tags

rust,error-handling,observability,tracing,backend

pub enum SubscribeError {
    Validation(SubscribeValidationError),
    Unexpected(anyhow::Error),
}

impl actix_web::ResponseError for SubscribeError {
    fn status_code(&self) -> actix_web::http::StatusCode {
        match self {
            Self::Validation(_) => actix_web::http::StatusCode::BAD_REQUEST,
            Self::Unexpected(_) => actix_web::http::StatusCode::INTERNAL_SERVER_ERROR,
        }
    }
}

© hashgraph-online, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (references) in plugins/LVTD-LLC/skills/skills/rust-error-observability of hashgraph-online/awesome-codex-plugins.

• SKILL.md
• agents/openai.yaml
• references/error-boundaries.md
• references/secrets-and-pii.md
• references/tracing.md

Open the folder on GitHubat commit 16b4156