Agent skill

Writing Codex Briefs

by ccplugins in ccplugins/awesome-claude-code-plugins

A skill your agent uses when composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex).

Apache-2.0Auto-check passedProduct & Project Management

Install Writing Codex Briefs

skills CLI

$ npx skills add ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a claude-code

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

GitHub CLI

$ gh skill install ccplugins/awesome-claude-code-plugins writing-codex-briefs --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/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/praetor/skills/writing-codex-briefs .claude/skills/writing-codex-briefs && 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 "writing-codex-briefs" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs into .claude/skills/writing-codex-briefs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "writing-codex-briefs", 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/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs

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 ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a codex

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

GitHub CLI

$ gh skill install ccplugins/awesome-claude-code-plugins writing-codex-briefs --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/praetor/skills/writing-codex-briefs .agents/skills/writing-codex-briefs && 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 "writing-codex-briefs" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs into .agents/skills/writing-codex-briefs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "writing-codex-briefs", 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 ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a cursor

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

GitHub CLI

$ gh skill install ccplugins/awesome-claude-code-plugins writing-codex-briefs --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/praetor/skills/writing-codex-briefs .cursor/skills/writing-codex-briefs && 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 "writing-codex-briefs" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs into .cursor/skills/writing-codex-briefs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "writing-codex-briefs", 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/ccplugins/awesome-claude-code-plugins.git --path plugins/praetor/skills/writing-codex-briefs

--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 ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a gemini-cli

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

GitHub CLI

$ gh skill install ccplugins/awesome-claude-code-plugins writing-codex-briefs --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/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/praetor/skills/writing-codex-briefs .gemini/skills/writing-codex-briefs && 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 "writing-codex-briefs" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs into .gemini/skills/writing-codex-briefs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "writing-codex-briefs", 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 ccplugins/awesome-claude-code-plugins writing-codex-briefs

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 ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/praetor/skills/writing-codex-briefs .github/skills/writing-codex-briefs && 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 "writing-codex-briefs" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs into .github/skills/writing-codex-briefs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "writing-codex-briefs", 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 ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -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 ccplugins/awesome-claude-code-plugins writing-codex-briefs --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/ccplugins/awesome-claude-code-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/praetor/skills/writing-codex-briefs .opencode/skills/writing-codex-briefs && 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 "writing-codex-briefs" agent skill from https://github.com/ccplugins/awesome-claude-code-plugins/tree/main/plugins/praetor/skills/writing-codex-briefs into .opencode/skills/writing-codex-briefs/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "writing-codex-briefs", 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: writing-codex-briefs
GitHub stars: 967
Token cost: ~592 tokens
SKILL.md length: 200 words
Files: 1
Skills in repo: 68
Repo updated: Aug 12, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

A skill your agent uses when composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex).

Composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex)
SKILL.md covers The Acceptance File —…, The Brief and Common Mistakes
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Tasks that involve User stories

What it does

Writing Codex Briefs is an agent skill from ccplugins/awesome-claude-code-plugins. Use when composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex). Covers the self-contained brief format and how to write acceptance checks that actually protect you — weak checks are the sneakiest way a dispatch goes wrong.

Its SKILL.md is about 590 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 Product & Project Management, covering User stories. The repository describes itself as: Awesome Claude Code plugins — a curated list of slash commands, subagents, MCP servers, and hooks for Claude Code. The licence is Apache-2.0.

When your agent uses it

Composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex)
Tasks that involve User stories

Example prompts

“/writing-codex-briefs”

What it can do on your machine

Read from SKILL.md and the folder at commit 5bd4f16. 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

Writing Codex Briefs loads about 592 tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 200 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~74
When it runs · the whole SKILL.md, loaded when a task matches: ~592

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 ccplugins/awesome-claude-code-plugins at commit 5bd4f16, republished under its Apache-2.0 licence (© ccplugins). 200 words, ~592 tokens.

Download SKILL.mdSave it as .claude/skills/writing-codex-briefs/SKILL.md (or your agent's skills folder).

name: writing-codex-briefs
description: Use when composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex). Covers the self-contained brief format and how to write acceptance checks that actually protect you — weak checks are the sneakiest way a dispatch goes wrong.

Writing Codex Briefs

Codex sees zero chat history. The brief is the only channel. Anything not in it does not exist for Codex.

The Acceptance File — `.codex/ACCEPTANCE.md`

Written and committed BEFORE dispatch. This is the frozen bar the judge will enforce.

GOAL: <one sentence: what "done" means>

CHECKS (all must pass, exact commands):
- `<command>` exits 0 and prints <expected>
- `<build/typecheck command>` exits 0
- `<specific test command>` exits 0

CONSTRAINTS:
- Only edit <files/dirs>. Do not modify <test files / this file / unrelated code>.

Writing checks that protect you (the judge is only as strong as these):

Prefer commands with exit codes over "the code should look right".
Include at least one check that fails before the work is done (red → green) — a check that passes on the untouched repo proves nothing.
Name the specific tests, not "run the tests" (slow suites make the judge cry wolf; flaky checks are worse than none).
Vacuous bars ("typecheck passes") let bad work through with a green light. Ask: could a lazy stub pass these checks? If yes, tighten them.

The Brief

GOAL: <same one sentence — must match ACCEPTANCE.md>
CONTEXT: <repo path, key files, constraints — everything Codex needs, it cannot ask you>
DO: <numbered, concrete steps>
VERIFY: <run the exact CHECKS above and show their real output>
REPORT: <what to return: diff summary + which checks passed>
DO NOT: commit anything; touch .codex/ACCEPTANCE.md; edit unrelated files;
        delete or weaken tests; add silent fallbacks or fake/stubbed results.

The DO NOT block is mandatory and always includes those five items — they are the exact ways executor models paper over failure.

Common Mistakes

Context by reference ("as discussed above") — Codex has no "above". Inline it.
Goal drift — brief GOAL ≠ ACCEPTANCE GOAL means the judge enforces a different bar than Codex aimed at.
Kitchen-sink briefs — one dispatch, one goal. Two unrelated goals = two dispatches.

Files

Just SKILL.md in plugins/praetor/skills/writing-codex-briefs of ccplugins/awesome-claude-code-plugins.

Open the folder on GitHubat commit 5bd4f16

Compare with similar skills

Writing Codex Briefs 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.

Writing Codex Briefs compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Writing Codex Briefs this skillccplugins/awesome-claude-code-plugins	967	—	~592	Automated safety check: Pass	Apache-2.0	1 mo ago
User Story Writerdeanpeters/Product-Manager-Skills	7.2k	2 repos	~2.9k	Automated safety check: Pass	Custom licence	1 mo ago
Ralph Tui Create Beadssubsy/ralph-tui	2.5k	1 repos	~2.6k	Automated safety check: Pass	MIT	1 mo ago
Agile Product Owneralirezarezvani/claude-skills	28k	3 repos	~3.2k	Automated safety check: Pass	MIT	1 mo ago
Ralph Tui Create Beads Rustsubsy/ralph-tui	2.5k	1 repos	~2.8k	Automated safety check: Pass	MIT	1 mo ago
Ralph Tui Create JSONsubsy/ralph-tui	2.5k	1 repos	~2.6k	Automated safety check: Pass	MIT	1 mo ago

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Questions about Writing Codex Briefs

What does Writing Codex Briefs do?

A skill your agent uses when composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex). Writing Codex Briefs is an agent skill from ccplugins/awesome-claude-code-plugins. Use when composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex).

When should I use Writing Codex Briefs?

Writing Codex Briefs fits situations like: composing the task brief and acceptance criteria for a Codex dispatch (invoked from dispatching-to-codex); tasks that involve User stories.

How do I install Writing Codex Briefs in Claude Code?

Run `npx skills add ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a claude-code`. Or copy the skill folder (plugins/praetor/skills/writing-codex-briefs in ccplugins/awesome-claude-code-plugins) into .claude/skills/writing-codex-briefs in your project. Claude Code loads it when a task matches its description.

How do I install Writing Codex Briefs in Codex?

Run `npx skills add ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a codex`. Or copy the skill folder (plugins/praetor/skills/writing-codex-briefs in ccplugins/awesome-claude-code-plugins) into .agents/skills/writing-codex-briefs in your project. Codex loads it when a task matches its description.

Can I use Writing Codex Briefs 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 ccplugins/awesome-claude-code-plugins --skill writing-codex-briefs -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/writing-codex-briefs, .gemini/skills/writing-codex-briefs, .github/skills/writing-codex-briefs and .opencode/skills/writing-codex-briefs in your project.

What does Writing Codex Briefs need to run?

SKILL.md names no scripts, command-line tools or credentials: Writing Codex Briefs is instructions for the agent only.

Does Writing Codex Briefs 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 Writing Codex Briefs 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 Writing Codex Briefs use?

Writing Codex Briefs is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Writing Codex Briefs use?

About 592 tokens (SKILL.md is roughly 2.4k 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 Writing Codex Briefs?

Skills that share tags, products or a category with Writing Codex Briefs: User Story Writer (deanpeters/Product-Manager-Skills, 7.2k stars), Ralph Tui Create Beads (subsy/ralph-tui, 2.5k stars), Agile Product Owner (alirezarezvani/claude-skills, 28k stars) and Ralph Tui Create Beads Rust (subsy/ralph-tui, 2.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Writing Codex Briefs?

ccplugins (a GitHub organization) maintains it in ccplugins/awesome-claude-code-plugins, which has 967 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on August 12, 2026.

Source: ccplugins/awesome-claude-code-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Writing Codex Briefs

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

Writing Codex Briefs

The Acceptance File — .codex/ACCEPTANCE.md

The Brief

Common Mistakes

Files

Compare with similar skills

Similar skills

More from ccplugins/awesome-claude-code-plugins

Related

Questions about Writing Codex Briefs

The Acceptance File — `.codex/ACCEPTANCE.md`