Agent skill

Preserve Error Source

A skill your agent uses when defining a new error variant or wrapping a lower-level error — keep the underlying error's source chain intact.

MITAuto-check passedDevelopment

Install Preserve Error Source

skills CLI

$ npx skills add 0xMiden/protocol --skill preserve-error-source -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol preserve-error-source --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/preserve-error-source .claude/skills/preserve-error-source && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "preserve-error-source" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source into .claude/skills/preserve-error-source/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "preserve-error-source", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add 0xMiden/protocol --skill preserve-error-source -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol preserve-error-source --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/preserve-error-source .agents/skills/preserve-error-source && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "preserve-error-source" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source into .agents/skills/preserve-error-source/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "preserve-error-source", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add 0xMiden/protocol --skill preserve-error-source -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol preserve-error-source --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/preserve-error-source .cursor/skills/preserve-error-source && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "preserve-error-source" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source into .cursor/skills/preserve-error-source/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "preserve-error-source", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/0xMiden/protocol.git --path .claude/skills/preserve-error-source

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add 0xMiden/protocol --skill preserve-error-source -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol preserve-error-source --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/preserve-error-source .gemini/skills/preserve-error-source && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "preserve-error-source" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source into .gemini/skills/preserve-error-source/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "preserve-error-source", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install 0xMiden/protocol preserve-error-source

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add 0xMiden/protocol --skill preserve-error-source -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/preserve-error-source .github/skills/preserve-error-source && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "preserve-error-source" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source into .github/skills/preserve-error-source/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "preserve-error-source", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add 0xMiden/protocol --skill preserve-error-source -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol preserve-error-source --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/preserve-error-source .opencode/skills/preserve-error-source && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "preserve-error-source" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/preserve-error-source into .opencode/skills/preserve-error-source/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "preserve-error-source", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: preserve-error-source
GitHub stars: 133
Token cost: ~373 tokens
SKILL.md length: 105 words
Files: 1
Skills in repo: 35
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when defining a new error variant or wrapping a lower-level error — keep the underlying error's source chain intact.

Defining a new error variant
SKILL.md covers Rule, Why and Examples
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Wrapping a lower-level error — keep the underlying errors source chain intact

What it does

Preserve Error Source is an agent skill from 0xMiden/protocol. Use when defining a new error variant or wrapping a lower-level error — keep the underlying error's source chain intact.

Its SKILL.md is about 370 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

Defining a new error variant
Wrapping a lower-level error — keep the underlying errors source chain intact

Example prompts

“/preserve-error-source”

What it can do on your machine

Read from SKILL.md and the folder at commit 474c88e. 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.

Context cost

Preserve Error Source loads about 373 tokens when it runs. Until then it costs about 36 tokens; SKILL.md has 105 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~36
When it runs · the whole SKILL.md, loaded when a task matches: ~373

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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 0xMiden/protocol at commit 474c88e, republished under its MIT licence (© 0xMiden). 105 words, ~373 tokens.

Download SKILL.mdSave it as .claude/skills/preserve-error-source/SKILL.md (or your agent's skills folder).

name: preserve-error-source
description: Use when defining a new error variant or wrapping a lower-level error — keep the underlying error's source chain intact.

Preserve Error Source Chains

Rule

When a new error wraps a lower-level error, preserve the source so the chain remains traversable:

Use thiserror's #[source] attribute (or #[from]) to attach the underlying error.
For dynamic sources, Box<dyn Error + Send + Sync + 'static>.
Do not call .to_string() on the source and embed it into the wrapper's message — that breaks Error::source() traversal and destroys structured information.

Why

Tools like anyhow, tracing, and logging walk Error::source() to render full chains and group by root cause. Stringifying the source into the message flattens it to one opaque string — the chain can't be walked and the inner error's fields are gone.

Examples

rust

// Good
#[derive(Debug, thiserror::Error)]
pub enum AccountError {
    #[error("failed to deserialize account storage")]
    StorageDeser(#[source] DeserializationError),

    #[error("failed to load account from {path}")]
    Load { path: PathBuf, #[source] io: io::Error },
}

// Bad: source is stringified, chain is lost
#[derive(Debug, thiserror::Error)]
pub enum AccountError {
    #[error("failed to deserialize account storage: {0}")]
    StorageDeser(String),
}

// Bad: source baked into the message via format!
return Err(AccountError::StorageDeser(format!("{e}")));

Files

Just SKILL.md in .claude/skills/preserve-error-source of 0xMiden/protocol.

Open the folder on GitHubat commit 474c88e

Compare with similar skills

Preserve Error Source next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Preserve Error Source compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Preserve Error Source this skill0xMiden/protocol	133	—	~373	Automated safety check: Pass	MIT	yesterday
Vercel Composition Patternssupabase/supabase	111k	59 repos	~726	Automated safety check: Pass	MIT	today
Finishing a Development Branchobra/superpowers	296k	5 repos	~1.9k	Automated safety check: Pass	MIT	today
Typescript Advanced Typesrolling-scopes/rsschool-app	10k	25 repos	~4.2k	Automated safety check: Pass	MPL-2.0	4 days ago
PR Babysitteropeninterpreter/openinterpreter	69k	3 repos	~4.2k	Automated safety check: Pass	Apache-2.0	yesterday
Code Review ChecklistshareAI-lab/learn-claude-code	78k	5 repos	~1.1k	Automated safety check: Pass	MIT	10 days ago

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Conversion Method Naming
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Questions about Preserve Error Source

What does Preserve Error Source do?

A skill your agent uses when defining a new error variant or wrapping a lower-level error — keep the underlying error's source chain intact. Preserve Error Source is an agent skill from 0xMiden/protocol. Use when defining a new error variant or wrapping a lower-level error — keep the underlying error's source chain intact.

When should I use Preserve Error Source?

Preserve Error Source fits situations like: defining a new error variant; wrapping a lower-level error — keep the underlying errors source chain intact.

How do I install Preserve Error Source in Claude Code?

Run `npx skills add 0xMiden/protocol --skill preserve-error-source -a claude-code`. Or copy the skill folder (.claude/skills/preserve-error-source in 0xMiden/protocol) into .claude/skills/preserve-error-source in your project. Claude Code loads it when a task matches its description.

How do I install Preserve Error Source in Codex?

Run `npx skills add 0xMiden/protocol --skill preserve-error-source -a codex`. Or copy the skill folder (.claude/skills/preserve-error-source in 0xMiden/protocol) into .agents/skills/preserve-error-source in your project. Codex loads it when a task matches its description.

Can I use Preserve Error Source in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add 0xMiden/protocol --skill preserve-error-source -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/preserve-error-source, .gemini/skills/preserve-error-source, .github/skills/preserve-error-source and .opencode/skills/preserve-error-source in your project.

What does Preserve Error Source need to run?

SKILL.md names no scripts, command-line tools or credentials: Preserve Error Source is instructions for the agent only.

Does Preserve Error Source access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Preserve Error Source safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Preserve Error Source use?

Preserve Error Source is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Preserve Error Source use?

About 373 tokens (SKILL.md is roughly 1.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Preserve Error Source?

Skills that share tags, products or a category with Preserve Error Source: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Preserve Error Source?

0xMiden (a GitHub organization) maintains it in 0xMiden/protocol, which has 133 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 7, 2026.

Source: 0xMiden/protocol on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Preserve Error Source

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Preserve Error Source Chains

Rule

Why

Examples

Files

Compare with similar skills

Similar skills

More from 0xMiden/protocol

Related

Questions about Preserve Error Source