Skill Creator
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
Create, synthesize, and iteratively improve agent skills following the Agent Skills specification.
Install Skill Writer
$ npx skills add getsentry/warden --skill skill-writer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install getsentry/warden skill-writer --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/getsentry/warden.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/warden/src/internal-skills/skill-writer .claude/skills/skill-writer && 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 "skill-writer" agent skill from https://github.com/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writer into .claude/skills/skill-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-writer", 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/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writerType 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 getsentry/warden --skill skill-writer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install getsentry/warden skill-writer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/warden.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/warden/src/internal-skills/skill-writer .agents/skills/skill-writer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "skill-writer" agent skill from https://github.com/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writer into .agents/skills/skill-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-writer", 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 getsentry/warden --skill skill-writer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install getsentry/warden skill-writer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/warden.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/warden/src/internal-skills/skill-writer .cursor/skills/skill-writer && 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 "skill-writer" agent skill from https://github.com/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writer into .cursor/skills/skill-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-writer", 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/getsentry/warden.git --path packages/warden/src/internal-skills/skill-writer--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 getsentry/warden --skill skill-writer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install getsentry/warden skill-writer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/warden.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/warden/src/internal-skills/skill-writer .gemini/skills/skill-writer && 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 "skill-writer" agent skill from https://github.com/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writer into .gemini/skills/skill-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-writer", 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 getsentry/warden skill-writerInstalls 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 getsentry/warden --skill skill-writer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/getsentry/warden.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/warden/src/internal-skills/skill-writer .github/skills/skill-writer && 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 "skill-writer" agent skill from https://github.com/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writer into .github/skills/skill-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-writer", 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 getsentry/warden --skill skill-writer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install getsentry/warden skill-writer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/getsentry/warden.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/warden/src/internal-skills/skill-writer .opencode/skills/skill-writer && 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 "skill-writer" agent skill from https://github.com/getsentry/warden/tree/main/packages/warden/src/internal-skills/skill-writer into .opencode/skills/skill-writer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-writer", 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
skill-writer- GitHub stars
- 414
- Used in
- 1 other repo
- Token cost
- ~2.5k tokens
- SKILL.md length
- 1,039 words
- Files
- 48 (incl. scripts, references)
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Create, synthesize, and iteratively improve agent skills following the Agent Skills specification.
- Works in 7 steps: Resolve target, path, and shape → Run synthesis when needed → Run iteration first when improving from… → …
- Asked to create a skill
- SKILL.md covers Core Workflow References, Artifact Layout References, Workflow Mechanic References and Claude Code References, plus 9 more sections
- Synthesize sources into a skill
What it does
Skill Writer is an agent skill from getsentry/warden, published by the product's own GitHub organization. Create, synthesize, and iteratively improve agent skills following the Agent Skills specification. Use when asked to "create a skill", "write a skill", "synthesize sources into a skill", "improve a skill from positive/negative examples", "update a skill", or "maintain skill docs and registration". Handles source capture, depth gates, authoring, registration, and validation.
Its SKILL.md is about 2.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 50 other files, including scripts and reference files (for example `EVAL.md`, `SOURCES.md` and `SPEC.md`).
It sits in Agent Workflows, covering Skill authoring. The repository describes itself as: Your code is under new management. Agents that review your code.
When your agent uses it
- Asked to create a skill
- Synthesize sources into a skill
- Improve a skill from positive/negative examples
- Maintain skill docs and registration
Example prompts
- “create a skill”
- “write a skill”
- “synthesize sources into a skill”
- “/skill-writer”
Workflow steps
7 steps, taken from the step headings in SKILL.md.
- Resolve target, path, and shape
- Run synthesis when needed
- Run iteration first when improving from outcomes/examples
- Author or update skill artifacts
- Optimize description quality
- Evaluate only when needed
- Register and validate
What it can do on your machine
Read from SKILL.md and the folder at commit 1ee135e. 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
Ships 1 file in scripts/, which the agent can run.
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
Skill Writer loads about 2.5k tokens when it runs, and up to ~19k if it reads all its reference files. Until then it costs about 97 tokens; SKILL.md has 1,039 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); the scripts in this folder are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,039 words (~2,481 tokens).
“Use this as the single canonical workflow for skill creation and improvement. Primary success condition: maximize high-value input coverage before authoring while minimizing wasted runtime tokens.”
- name
- skill-writer
Files
SKILL.md and 47 other files (scripts, references) in packages/warden/src/internal-skills/skill-writer of getsentry/warden.
- SKILL.md
- EVAL.md
- SOURCES.md
- SPEC.md
- references/artifact-layouts/argument-driven-skill-layout.md
- references/artifact-layouts/asset-template-skill-layout.md
- references/artifact-layouts/inline-skill-layout.md
- references/artifact-layouts/reference-backed-skill-layout.md
- references/artifact-layouts/script-backed-skill-layout.md
- references/authoring-path.md
- references/claude-code/argument-substitutions.md
- references/claude-code/dynamic-context.md
- references/claude-code/frontmatter-and-invocation.md
- references/claude-code/hook-backed-skills.md
- references/claude-code/subagent-fork-skills.md
- references/description-optimization.md
- references/design-principles.md
- references/evaluation-path.md
- … and 30 more
Open the folder on GitHubat commit 1ee135e
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in getsentry/warden, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Skill Writer 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 |
|---|---|---|---|---|---|---|
| Skill Writer this skillgetsentry/warden | 414 | 1 repos | ~2.5k | Automated safety check: Pass | Custom licence | |
| Skill CreatorAzure/azqr | 794 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase | 10k | 10 repos | ~3.5k | Automated safety check: Pass | MIT | |
| Darwin Skill Optimizeralchaincyf/darwin-skill | 6.2k | 1 repos | ~4.7k | Automated safety check: Pass | MIT | |
| Claude Code Command Developmentanthropics/claude-plugins-official | 37k | 10 repos | ~4.8k | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Plugin Structureanthropics/claude-plugins-official | 37k | 10 repos | ~3.4k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Skill Writer
What does Skill Writer do?
Create, synthesize, and iteratively improve agent skills following the Agent Skills specification. Skill Writer is an agent skill from getsentry/warden, published by the product's own GitHub organization. Create, synthesize, and iteratively improve agent skills following the Agent Skills specification.
When should I use Skill Writer?
Skill Writer fits situations like: asked to create a skill; synthesize sources into a skill; improve a skill from positive/negative examples; maintain skill docs and registration.
How do I install Skill Writer in Claude Code?
Run `npx skills add getsentry/warden --skill skill-writer -a claude-code`. Or copy the skill folder (packages/warden/src/internal-skills/skill-writer in getsentry/warden) into .claude/skills/skill-writer in your project. Claude Code loads it when a task matches its description.
How do I install Skill Writer in Codex?
Run `npx skills add getsentry/warden --skill skill-writer -a codex`. Or copy the skill folder (packages/warden/src/internal-skills/skill-writer in getsentry/warden) into .agents/skills/skill-writer in your project. Codex loads it when a task matches its description.
Can I use Skill Writer 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 getsentry/warden --skill skill-writer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-writer, .gemini/skills/skill-writer, .github/skills/skill-writer and .opencode/skills/skill-writer in your project.
What does Skill Writer need to run?
SKILL.md names no scripts, command-line tools or credentials: Skill Writer is instructions for the agent only.
Does Skill Writer 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 Skill Writer 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Skill Writer use?
Skill Writer has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Skill Writer use?
About 2.5k tokens (SKILL.md is roughly 9.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 17k tokens, read only when the agent opens those files.
What are the alternatives to Skill Writer?
Skills that share tags, products or a category with Skill Writer: Skill Creator (Azure/azqr, 794 stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars), Darwin Skill Optimizer (alchaincyf/darwin-skill, 6.2k stars) and Claude Code Command Development (anthropics/claude-plugins-official, 37k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Writer?
getsentry (a GitHub organization, an official publisher) maintains it in getsentry/warden, which has 414 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on September 30, 2026.
Source: getsentry/warden on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.