Code Review
flutter/flutter
Performs a comprehensive, multi-step code review of pull requests or local code changes, using iterative refinement (generation, critique, synthesis) to ensure high-quality, actionable feedback.
Define consistent API error codes and responses. An agent skill from proflead/codex-skills-library.
No licenceAuto-check passed
Install API Error Taxonomy
$ npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install proflead/codex-skills-library api-error-taxonomy --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/proflead/codex-skills-library.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/api/api-error-taxonomy .claude/skills/api-error-taxonomy && rm -rf skills-srcUse ~/.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/
Install the "api-error-taxonomy" agent skill from https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomy into .claude/skills/api-error-taxonomy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-error-taxonomy", 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 install https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomyType 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.
$ npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install proflead/codex-skills-library api-error-taxonomy --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/proflead/codex-skills-library.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/api/api-error-taxonomy .agents/skills/api-error-taxonomy && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "api-error-taxonomy" agent skill from https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomy into .agents/skills/api-error-taxonomy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-error-taxonomy", 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.
$ npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install proflead/codex-skills-library api-error-taxonomy --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/proflead/codex-skills-library.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/api/api-error-taxonomy .cursor/skills/api-error-taxonomy && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "api-error-taxonomy" agent skill from https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomy into .cursor/skills/api-error-taxonomy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-error-taxonomy", 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 https://github.com/proflead/codex-skills-library.git --path skills/api/api-error-taxonomy--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install proflead/codex-skills-library api-error-taxonomy --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/proflead/codex-skills-library.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/api/api-error-taxonomy .gemini/skills/api-error-taxonomy && rm -rf skills-srcUse ~/.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/
Install the "api-error-taxonomy" agent skill from https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomy into .gemini/skills/api-error-taxonomy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-error-taxonomy", 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.
$ gh skill install proflead/codex-skills-library api-error-taxonomyInstalls 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).
$ npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/proflead/codex-skills-library.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/api/api-error-taxonomy .github/skills/api-error-taxonomy && rm -rf skills-srcUse ~/.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/
Install the "api-error-taxonomy" agent skill from https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomy into .github/skills/api-error-taxonomy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-error-taxonomy", 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.
$ npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install proflead/codex-skills-library api-error-taxonomy --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/proflead/codex-skills-library.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/api/api-error-taxonomy .opencode/skills/api-error-taxonomy && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "api-error-taxonomy" agent skill from https://github.com/proflead/codex-skills-library/tree/master/skills/api/api-error-taxonomy into .opencode/skills/api-error-taxonomy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-error-taxonomy", 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
api-error-taxonomy- GitHub stars
- 155
- Token cost
- ~176 tokens
- SKILL.md length
- 71 words
- Files
- 1
- Skills in repo
- 10
- Repo updated
- First seen
- Licence
- None found
At a glance
Define consistent API error codes and responses. An agent skill from proflead/codex-skills-library.
- Works in 3 steps: List common error categories and HTTP… → Define error payload shape and fields. → Set guidelines for logging and client…
- A mid-level developer needs error standardization
- SKILL.md covers Purpose, Inputs to request, Workflow and Output, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
API Error Taxonomy is an agent skill from proflead/codex-skills-library. Define consistent API error codes and responses. Use when a mid-level developer needs error standardization.
Its SKILL.md is about 180 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: Codex Skills Library is a curated library of reusable Codex skills for developers, individuals, and teams.
When your agent uses it
- A mid-level developer needs error standardization
Example prompts
- “/api-error-taxonomy”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- List common error categories and HTTP mappings.
- Define error payload shape and fields.
- Set guidelines for logging and client messaging.
What it can do on your machine
Read from SKILL.md and the folder at commit a05260c. 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.
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
API Error Taxonomy loads about 176 tokens when it runs. Until then it costs about 32 tokens; SKILL.md has 71 words of instructions outside code blocks.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 71 words (~176 tokens).
“Define consistent API error codes and responses.”
- name
- api-error-taxonomy
Files
Just SKILL.md in skills/api/api-error-taxonomy of proflead/codex-skills-library.
Open the folder on GitHubat commit a05260c
Compare with similar skills
API Error Taxonomy 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| API Error Taxonomy this skillproflead/codex-skills-library | 155 | — | ~176 | Automated safety check: Pass | None | |
| Code Reviewflutter/flutter | 180k | — | ~1.4k | Automated safety check: Pass | BSD-3-Clause | |
| Simplify CodeNousResearch/hermes-agent | 252k | — | ~3.7k | Automated safety check: Pass | MIT | |
| Architectural Code ReviewDonchitos/Claude-Code-Game-Studios | 26k | — | ~3.5k | Automated safety check: Pass | MIT | |
| Coding Agentopenclaw/openclaw | 392k | 1 repos | ~2.7k | Automated safety check: Pass | MIT | |
| Review Codepenpot/penpot | 61k | — | ~1k | Automated safety check: Pass | MPL-2.0 |
Similar skills
Simplify Code
NousResearch/hermes-agent
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Architectural Code Review
Donchitos/Claude-Code-Game-Studios
Performs an architectural review of code against coding standards, SOLID, testability and performance, and reports no verdict when the inputs are missing.
Coding Agent
openclaw/openclaw
Delegate coding work to Codex, Claude Code, or OpenCode as background workers; not simple edits or read-only code lookup.
Review Code
penpot/penpot
Code review flow — review a diff, PR, or code change, delegating the review to a subagent that follows the code-review-criteria skill.
- Official
SQL Code Review
github/awesome-copilot
Universal SQL code review assistant that performs comprehensive security, maintainability, and code quality analysis across all SQL databases (MySQL, PostgreSQL, SQL Server, Oracle).
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Questions about API Error Taxonomy
What does API Error Taxonomy do?
Define consistent API error codes and responses. An agent skill from proflead/codex-skills-library. API Error Taxonomy is an agent skill from proflead/codex-skills-library. Define consistent API error codes and responses.
When should I use API Error Taxonomy?
API Error Taxonomy fits situations like: A mid-level developer needs error standardization.
How do I install API Error Taxonomy in Claude Code?
Run `npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a claude-code`. Or copy the skill folder (skills/api/api-error-taxonomy in proflead/codex-skills-library) into .claude/skills/api-error-taxonomy in your project. Claude Code loads it when a task matches its description.
How do I install API Error Taxonomy in Codex?
Run `npx skills add proflead/codex-skills-library --skill api-error-taxonomy -a codex`. Or copy the skill folder (skills/api/api-error-taxonomy in proflead/codex-skills-library) into .agents/skills/api-error-taxonomy in your project. Codex loads it when a task matches its description.
Can I use API Error Taxonomy 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 proflead/codex-skills-library --skill api-error-taxonomy -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/api-error-taxonomy, .gemini/skills/api-error-taxonomy, .github/skills/api-error-taxonomy and .opencode/skills/api-error-taxonomy in your project.
What does API Error Taxonomy need to run?
SKILL.md names no scripts, command-line tools or credentials: API Error Taxonomy is instructions for the agent only.
Does API Error Taxonomy 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 API Error Taxonomy 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 API Error Taxonomy use?
No licence was found for API Error Taxonomy or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does API Error Taxonomy use?
About 176 tokens (SKILL.md is roughly 704 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 API Error Taxonomy?
Skills that share tags, products or a category with API Error Taxonomy: Code Review (flutter/flutter, 180k stars), Simplify Code (NousResearch/hermes-agent, 252k stars), Architectural Code Review (Donchitos/Claude-Code-Game-Studios, 26k stars) and Coding Agent (openclaw/openclaw, 392k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains API Error Taxonomy?
proflead (a GitHub user) maintains it in proflead/codex-skills-library, which has 155 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on July 29, 2026.
Source: proflead/codex-skills-library on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.