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Comprehensive guide for developing in the Astro monorepo. An agent skill from withastro/astro.
Install Astro Developer
$ npx skills add withastro/astro --skill astro-developer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install withastro/astro astro-developer --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/withastro/astro.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/astro-developer .claude/skills/astro-developer && 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 "astro-developer" agent skill from https://github.com/withastro/astro/tree/main/.agents/skills/astro-developer into .claude/skills/astro-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "astro-developer", 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/withastro/astro/tree/main/.agents/skills/astro-developerType 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 withastro/astro --skill astro-developer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install withastro/astro astro-developer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/withastro/astro.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/astro-developer .agents/skills/astro-developer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "astro-developer" agent skill from https://github.com/withastro/astro/tree/main/.agents/skills/astro-developer into .agents/skills/astro-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "astro-developer", 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 withastro/astro --skill astro-developer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install withastro/astro astro-developer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/withastro/astro.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/astro-developer .cursor/skills/astro-developer && 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 "astro-developer" agent skill from https://github.com/withastro/astro/tree/main/.agents/skills/astro-developer into .cursor/skills/astro-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "astro-developer", 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/withastro/astro.git --path .agents/skills/astro-developer--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 withastro/astro --skill astro-developer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install withastro/astro astro-developer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/withastro/astro.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/astro-developer .gemini/skills/astro-developer && 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 "astro-developer" agent skill from https://github.com/withastro/astro/tree/main/.agents/skills/astro-developer into .gemini/skills/astro-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "astro-developer", 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 withastro/astro astro-developerInstalls 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 withastro/astro --skill astro-developer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/withastro/astro.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/astro-developer .github/skills/astro-developer && 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 "astro-developer" agent skill from https://github.com/withastro/astro/tree/main/.agents/skills/astro-developer into .github/skills/astro-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "astro-developer", 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 withastro/astro --skill astro-developer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install withastro/astro astro-developer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/withastro/astro.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/astro-developer .opencode/skills/astro-developer && 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 "astro-developer" agent skill from https://github.com/withastro/astro/tree/main/.agents/skills/astro-developer into .opencode/skills/astro-developer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "astro-developer", 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
astro-developer- GitHub stars
- 63k
- Used in
- 1 other repo
- Token cost
- ~1.5k tokens
- SKILL.md length
- 387 words
- Files
- 6
- Skills in repo
- 10
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Comprehensive guide for developing in the Astro monorepo. An agent skill from withastro/astro.
- Works in 5 steps: Prefer Unit Tests: Write unit-testable… → Node.js API Restrictions: Cannot use… → Test Isolation: Must set unique outDir… → …
- Working on features
- SKILL.md covers Quick Decision Matrix, Critical Warnings, Quick Command Reference and Key File Paths, plus 5 more sections
- Calls pnpm and node
What it does
Astro Developer is an agent skill from withastro/astro, published by the product's own GitHub organization. Comprehensive guide for developing in the Astro monorepo. Covers architecture, debugging, testing, and critical constraints. Use when working on features, fixes, tests, or understanding the codebase structure.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files (for example `architecture.md`, `constraints.md` and `debugging.md`).
It sits in Development, covering Static sites and blogs and Monorepo tooling. It works with Astro. The repository describes itself as: The web framework for content-driven websites.
When your agent uses it
- Working on features
- Understanding the codebase structure
Example prompts
- “/astro-developer”
Requirements
- Node.js
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Prefer Unit Tests: Write unit-testable code by default. Use integration tests only when necessary → testing.md
- Node.js API Restrictions: Cannot use Node.js APIs in runtime/ code → constraints.md
- Test Isolation: Must set unique outDir for each integration test → testing.md
- Runtime Boundaries: Core vs Vite vs Browser execution contexts → architecture.md
- Prerelease Mode: Changesets target origin/next branch (check .changeset/config.json)
What it can do on your machine
Read from SKILL.md and the folder at commit 28e7410. 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
Shell commands in SKILL.md call:
pnpmnode
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
docs.astro.build
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
Astro Developer loads about 1.5k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 387 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 387 words (~1,453 tokens).
“Context-loading skill for AI agents and developers working in the Astro monorepo. Loads relevant documentation based on your task.”
- name
- astro-developer
Files
SKILL.md and 5 other files in .agents/skills/astro-developer of withastro/astro.
- SKILL.md
- architecture.md
- constraints.md
- debugging.md
- evals/evals.json
- testing.md
Open the folder on GitHubat commit 28e7410
Used in 1 other repository
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in withastro/astro, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Astro Developer 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 |
|---|---|---|---|---|---|---|
| Astro Developer this skillwithastro/astro | 63k | 1 repos | ~1.5k | Automated safety check: Pass | Custom licence | |
| Docouture Docs InternalsInditexTech/weavejs | 208 | — | ~1k | Automated safety check: Pass | Apache-2.0 | |
| Work Issuejoesaby/astro-mermaid | 123 | — | ~891 | Automated safety check: Pass | MIT | |
| Aholo Viewer Monorepo Routingmanycoretech/aholo-viewer | 1.1k | — | ~380 | Automated safety check: Pass | MIT | |
| Sanity Best Practicesrobotostudio/turbo-start-sanity | 182 | — | ~940 | Automated safety check: Pass | MIT | |
| Launch With AWSaws/agent-toolkit-for-aws | 2.8k | — | ~3.2k | Automated safety check: Pass | Apache-2.0 |
Similar skills
Work Issue
joesaby/astro-mermaid
End-to-end workflow for resolving a GitHub issue in astro-mermaid — triages complexity, then runs brainstorm → TDD → implement → docs/spec → code review at the right depth.
Aholo Viewer Monorepo Routing
manycoretech/aholo-viewer
Coordinate Aholo Viewer monorepo work. Use for cross-module tasks, workspace scripts, generated docs/build flow, validation routing, cleanup boundaries, or…
Sanity Best Practices
robotostudio/turbo-start-sanity
Sanity development best practices for schema design, GROQ queries, TypeGen, Visual Editing, images, Portable Text, Studio structure, localization, migrations, Sanity Functions, Blueprints, and…
- Official
Launch With AWS
aws/agent-toolkit-for-aws
Migrates vibe-coded web applications to AWS. An agent skill from aws/agent-toolkit-for-aws.
- Official
Sanity Best Practices
sanity-io/agent-toolkit
Sanity development best practices for schema design, GROQ queries, TypeGen, Visual Editing, images, Portable Text, Studio structure, localization, migrations, Sanity Functions, webhooks, Blueprints…
More from withastro/astro
All 10 skills in this repo- Official
Analyze GitHub Action Logs
withastro/astro
Analyze recent GitHub Actions workflow runs to identify patterns, mistakes, and improvements.
- Official
Astro PR Writer
withastro/astro
Write and update Astro pull requests with reviewer-friendly titles and high-signal bodies.
- Official
Changeset
withastro/astro
Create a changeset for the Astro monorepo. An agent skill from withastro/astro.
- Official
Writing Comments
withastro/astro
How to write JSDoc (/ /) and inline (//) comments in the Astro codebase, for contributors reading the source — not end users.
- Official
Astro Code Review
withastro/astro
Perform a static, read-only code review of an Astro pull request or of a local branch, commit range, diff, patch, or working tree being prepared as a pull request.
- Official
Triagebot Action Bug Triage
withastro/astro
Takes a bug report for the triagebot-action GitHub Action through reproduction, root-cause diagnosis, an intended-behavior check and a fix attempt.
Related
Works with
Categories
Questions about Astro Developer
What does Astro Developer do?
Comprehensive guide for developing in the Astro monorepo. An agent skill from withastro/astro. Astro Developer is an agent skill from withastro/astro, published by the product's own GitHub organization. Comprehensive guide for developing in the Astro monorepo.
When should I use Astro Developer?
Astro Developer fits situations like: working on features; understanding the codebase structure.
How do I install Astro Developer in Claude Code?
Run `npx skills add withastro/astro --skill astro-developer -a claude-code`. Or copy the skill folder (.agents/skills/astro-developer in withastro/astro) into .claude/skills/astro-developer in your project. Claude Code loads it when a task matches its description.
How do I install Astro Developer in Codex?
Run `npx skills add withastro/astro --skill astro-developer -a codex`. Or copy the skill folder (.agents/skills/astro-developer in withastro/astro) into .agents/skills/astro-developer in your project. Codex loads it when a task matches its description.
Can I use Astro Developer 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 withastro/astro --skill astro-developer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/astro-developer, .gemini/skills/astro-developer, .github/skills/astro-developer and .opencode/skills/astro-developer in your project.
What does Astro Developer need to run?
Going by SKILL.md and its folder, Astro Developer needs the command-line tools its instructions call (pnpm and node). Our summary lists: Node.js.
Does Astro Developer access the network?
SKILL.md names 1 domain. As links in the text: docs.astro.build. This is read from the text; nothing was executed.
Is Astro Developer 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 Astro Developer use?
Astro Developer 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 Astro Developer use?
About 1.5k tokens (SKILL.md is roughly 5.8k 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 Astro Developer?
Skills that share tags, products or a category with Astro Developer: Docouture Docs Internals (InditexTech/weavejs, 208 stars), Work Issue (joesaby/astro-mermaid, 123 stars), Aholo Viewer Monorepo Routing (manycoretech/aholo-viewer, 1.1k stars) and Sanity Best Practices (robotostudio/turbo-start-sanity, 182 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Astro Developer?
withastro (a GitHub organization, an official publisher) maintains it in withastro/astro, which has 63,106 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on October 8, 2026.
Source: withastro/astro on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.