Official Astro monorepo contributor guide, fixed repository snapshot 28e74103fe3d999a56ae3404b5fe67a1ad6d8013. This is not a website-generation skill or a versioned Astro release. Thirteen original files, including six skill files, linked repository context, the actual Biome configuration and complete MIT notice, are retained unchanged under repository-context. The original primary instructions remain at repository-context/.agents/skills/astro-developer/SKILL.md. Only local link targets in the primary copy below are adjusted for this package; the original text is preserved separately. Evaluation prompts are retained as source material, not executed.
Independent local evidence records 46 observations across nine original documentation blocks with Node 24.10.0, Biome 2.5.3 and separately installed Astro 7.3.7. Node type erasure is experimental and is not a TypeScript typecheck. Synthetic imports and input files are explicitly provided by the runner. The unchanged Markdown unit assertion fails because its implementation retains a leading newline; the unchanged manifest unit assertion passes. A dual buildRoutes comparison also fails ESM parsing. These expected counterexamples are recorded, not silently rewritten.
The exact upstream Biome configuration reports Node API diagnostics in tested runtime folders and runtime-named files. Other lint diagnostics remain separate; zero errors from one rule does not mean a complete lint pass. The original bad virtual-module plugin emits a Node import; its emitted code is linted but its file read is not executed. Pure/configuration/Markdown/manifest functions and original file-reading plugin hooks use only independent synthetic data. Shared nested references and missing-frontmatter behavior are recorded.
Two real standalone Astro builds use the unchanged original JSON virtual-module plugin. Synthetic pages render different inputs in separate output and cache directories. The first output stays unchanged after the second build; generated title escaping, English HTML, one H1 and fixture canonical are checked. No monorepo loadFixture cache-pollution reproduction, browser hydration, edge adapter or all-pipeline compatibility claim follows. The build API is experimental. JavaScript HTTP/socket connections are denied by an independent preload during the builds; telemetry is disabled and zero attempts were recorded.
No account, database, real credential, production data, paid API or complete AI-client execution is involved. Installing locked dependencies separately contacts the free public registry. Full Astro checkouts and their current contributor instructions remain necessary for framework contributions; retained context is not the full monorepo. Installed dependencies, generated outputs and binaries are excluded from the download. Inspect examples/README.md and fixture-evidence.json for reproduction and limits. runtime_tested is false.
Context-loading skill for AI agents and developers working in the Astro monorepo. Loads relevant documentation based on your task.
What are you doing? → Read these files:
| Task | Primary Docs | Supporting Docs |
|---|---|---|
| Adding a core feature | architecture.md, constraints.md | testing.md |
| Fixing a bug | debugging.md | architecture.md |
| Writing/fixing tests | testing.md | constraints.md |
| Creating an integration | Explore packages/integrations/ for examples |
testing.md |
| Understanding architecture | architecture.md | - |
| Dealing with errors | debugging.md, constraints.md | testing.md |
| Understanding constraints | constraints.md | architecture.md |
Before you start, be aware of these common pitfalls:
runtime/ code → constraints.mdoutDir for each integration test → testing.mdorigin/next branch (check .changeset/config.json)# Development
pnpm install # Install (root only)
pnpm run build # Build all packages
pnpm run dev # Watch mode
pnpm run lint # Lint codebase
# Testing
pnpm -C packages/astro exec astro-scripts test "test/**/*.test.js" # All tests
pnpm -C packages/astro exec astro-scripts test -m "pattern" # Filter tests
pnpm run test:e2e # E2E tests
node --test test/file.test.js # Single test
# Examples
pnpm --filter @example/minimal run dev # Run example
# Changesets
pnpm exec changeset --empty # Create changeset, no interactive mode
packages/astro/src/
├── core/ # Node.js execution context (build/dev commands)
├── runtime/
│ ├── server/ # Vite SSR execution context
│ └── client/ # Browser execution context
├── virtual-modules/ # Virtual module entry points
├── content/ # Content layer system
├── vite-plugin-*/ # Vite plugins
└── types/ # Centralized TypeScript types
packages/integrations/ # Official integrations
examples/ # Test your changes here
test/fixtures/ # Test fixtures
Note: Error stack traces in node_modules/ map to source in packages/. See architecture.md for details.
This skill loads relevant context—it doesn't orchestrate workflows. After loading appropriate docs:
Three Execution Contexts:
Five Pipeline Types:
astro dev with Vite loader systemastro dev without runtime module loading (Cloudflare adapter)astro build + prerenderingSee architecture.md for complete details.
Philosophy: Prefer unit tests over integration tests. Write unit-testable code by default.
Unit tests (fast, preferred):
Integration tests (slow, use sparingly):
outDir to avoid cache pollutionSee testing.md for complete patterns and examples.
triage skill insteadanalyze-github-action-logs skillSource: Astro · MIT · SHA-256 shown alongside the download.
License file included. A license and checksum are not a security certification. Review package instructions and scripts before running them.
astro-developer/BB-SKILLS-REVIEW.json5708 bytesastro-developer/LICENSE.bb-skills.txt1066 bytesastro-developer/LICENSE.upstream.txt3628 bytesastro-developer/NOTICE.bb-skills.txt365 bytesastro-developer/SKILL.md9953 bytesastro-developer/SOURCE-MANIFEST.json6443 bytesastro-developer/SOURCE.txt383 bytesastro-developer/examples/README.md1947 bytesastro-developer/examples/run_fixture.mjs14822 bytesastro-developer/package-lock.json139934 bytesastro-developer/package.json223 bytesastro-developer/registry-evidence.json2151 bytesSource and packaging checks recorded on 2026-10-08. These notes are not safety certification or measured task performance.
For Astro framework contributions use a complete matching checkout. Included independent fixture tested with Node 24.10.0, Astro 7.3.7 and Biome 2.5.3 installed separately from the lockfile. Node type erasure and the Astro build API are experimental.
Free MIT resource. Fixture acquisition uses public npm; no paid API, real account, database or credential. Local evidence does not certify all pipeline/edge/browser behavior or complete AI-client skill execution.
Upstream commit: 28e74103fe3d999a56ae3404b5fe67a1ad6d8013
Runtime status: not tested by this catalog. Configure your client and test the skill in your own environment.
The notices identify their files, attribution and changes. Retain the applicable original notices when adapting or redistributing the package.
Original Astro instructions, context and configuration; repository notice retains applicable originating-part notices
Attribution: Copyright (c) 2021 Fred K. Schott; applicable originating-part attributions retained
Changes: Only primary-copy local link targets adjusted; original files preserved unchanged
Included notice: astro-developer/LICENSE.upstream.txt
Independent BB Skills packaging, preface, fixture and scoped evidence
Attribution: Copyright (c) 2026 BB Skills
Changes: Independent synthetic test harness with explicitly recorded counterexamples
Included notice: astro-developer/LICENSE.bb-skills.txt
Records are supplied by the site administrator and bound to a specific package. They are not third-party safety certification. This page does not execute skills.
Reported passed · v28e74103fe3d.bb1
Forty-six named observations across nine unchanged Astro documentation blocks with Node 24.10.0, Biome 2.5.3 and Astro 7.3.7. Actual upstream Biome configuration records Node API rule diagnostics separately from other lint failures. Original function and synthetic file effects, shallow shared references, missing-frontmatter behavior and file-reading plugin hooks are recorded. The original Markdown unit assertion intentionally fails due to a leading newline; the original manifest unit assertion passes. A duplicate buildRoutes example intentionally fails ESM parsing after experimental Node type erasure. Two real standalone Astro builds use the original JSON virtual-module plugin and independent synthetic pages, output/cache directories and input data. The second build preserves the first output; fixture language, H1, canonical and escaping are checked. Telemetry is disabled and JavaScript build connections denied with zero attempts. No complete TypeScript typecheck, monorepo cache-pollution reproduction, browser, edge, adapter/pipeline matrix, real credentials, production authorization, speed, full security or complete AI-client execution claim.
All 46 named observations match their explicit expected values, including original assertion and parse failures. Lint, unit and standalone build scope remain separate; no full-skill or production claim.
Forty-six named observations across nine unchanged Astro documentation blocks with Node 24.10.0, Biome 2.5.3 and Astro 7.3.7. Actual upstream Biome configuration records Node API rule diagnostics separately from other lint failures. Original function and synthetic file effects, shallow shared references, missing-frontmatter behavior and file-reading plugin hooks are recorded. The original Markdown unit assertion intentionally fails due to a leading newline; the original manifest unit assertion passes. A duplicate buildRoutes example intentionally fails ESM parsing after experimental Node type erasure. Two real standalone Astro builds use the original JSON virtual-module plugin and independent synthetic pages, output/cache directories and input data. The second build preserves the first output; fixture language, H1, canonical and escaping are checked. Telemetry is disabled and JavaScript build connections denied with zero attempts. No complete TypeScript typecheck, monorepo cache-pollution reproduction, browser, edge, adapter/pipeline matrix, real credentials, production authorization, speed, full security or complete AI-client execution claim.
Scoped native evidence:
{
"executed_at": "2026-10-08T03:06:08.045Z",
"versions": {
"node": "v24.10.0",
"astro": "7.3.7",
"biome": "2.5.3"
},
"observations": 46,
"cases": [
{
"name": "config retains existing fields",
"status": "passed",
"actual": "/demo",
"expected": "/demo"
},
{
"name": "config marks transformed output",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "config does not add property to input",
"status": "passed",
"actual": false,
"expected": false
},
{
"name": "config returns a new object",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "config nested object remains shared",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "original coupled config function writes file",
"status": "passed",
"actual": {
"base": "/first",
"transformed": true
},
"expected": {
"base": "/first",
"transformed": true
}
},
{
"name": "original separated config infrastructure writes file",
"status": "passed",
"actual": {
"base": "/second",
"transformed": true
},
"expected": {
"base": "/second",
"transformed": true
}
},
{
"name": "config infrastructure propagates missing file",
"status": "passed",
"actual": "ENOENT",
"expected": "ENOENT"
},
{
"name": "original markdown keeps leading newline",
"status": "passed",
"actual": "\nNOTE: Fix this",
"expected": "\nNOTE: Fix this"
},
{
"name": "original markdown without delimiters throws",
"status": "passed",
"actual": "TypeError",
"expected": "TypeError"
},
{
"name": "original separated markdown infrastructure writes file",
"status": "passed",
"actual": "\nNOTE: Fix this",
"expected": "\nNOTE: Fix this"
},
{
"name": "original coupled markdown infrastructure writes file",
"status": "passed",
"actual": "\nNOTE: Fix this",
"expected": "\nNOTE: Fix this"
},
{
"name": "pure manifest output contains route",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "pure manifest output increments version",
"status": "passed",
"actual": 2,
"expected": 2
},
{
"name": "pure manifest retains original routes",
"status": "passed",
"actual": 0,
"expected": 0
},
{
"name": "pure manifest retains original version",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "pure manifest returns distinct route array",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "pure manifest retains shared route object",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "coupled manifest mutates input",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "coupled manifest increments input version",
"status": "passed",
"actual": 2,
"expected": 2
},
{
"name": "unchanged original markdown unit assertion fails",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "unchanged original manifest unit assertion passes",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "unchanged dual buildRoutes example fails ESM parse",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "Biome Node API rule: packages/astro/src/runtime/server/sample.ts",
"status": "passed",
"actual": 5,
"expected": 5
},
{
"name": "Biome Node API rule: packages/astro/src/runtime/client/sample.ts",
"status": "passed",
"actual": 5,
"expected": 5
},
{
"name": "Biome Node API rule: packages/astro/src/vite-plugin-sample/runtime.ts",
"status": "passed",
"actual": 5,
"expected": 5
},
{
"name": "Biome Node API rule: packages/astro/src/core/render/runtime-utils.ts",
"status": "passed",
"actual": 5,
"expected": 5
},
{
"name": "Biome Node API rule: packages/astro/src/vite-plugin-sample/plugin.ts",
"status": "passed",
"actual": 0,
"expected": 0
},
{
"name": "Biome Node API rule: packages/astro/src/core/build/sample.ts",
"status": "passed",
"actual": 0,
"expected": 0
},
{
"name": "original bad plugin emits Node import",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "Biome Node API rule: packages/astro/src/runtime/server/generated-bad.ts",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "original file-reading plugin 3 returns synthetic source",
"status": "passed",
"actual": "BB synthetic file",
"expected": "BB synthetic file"
},
{
"name": "original file-reading plugin 6 returns synthetic source",
"status": "passed",
"actual": "BB synthetic file",
"expected": "BB synthetic file"
},
{
"name": "real Astro build 1 renders supplied title",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "real Astro build 1 has English HTML",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "real Astro build 1 has canonical",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "real Astro build 1 has single H1",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "real Astro build 1 attempts no JS socket or HTTP connection",
"status": "passed",
"actual": 0,
"expected": 0
},
{
"name": "real Astro output escapes synthetic script",
"status": "passed",
"actual": false,
"expected": false
},
{
"name": "real Astro build 2 renders supplied title",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "real Astro build 2 has English HTML",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "real Astro build 2 has canonical",
"status": "passed",
"actual": true,
"expected": true
},
{
"name": "real Astro build 2 has single H1",
"status": "passed",
"actual": 1,
"expected": 1
},
{
"name": "real Astro build 2 attempts no JS socket or HTTP connection",
"status": "passed",
"actual": 0,
"expected": 0
},
{
"name": "second Astro build preserves first output",
"status": "passed",
"actual": "bfb6a507c9f0083fab3030bc6e7c1e8a7f325d391df20a511eb5c3526b02d90b",
"expected": "bfb6a507c9f0083fab3030bc6e7c1e8a7f325d391df20a511eb5c3526b02d90b"
},
{
"name": "Biome Node API rule: packages/astro/src/runtime/server/generated-good.ts",
"status": "passed",
"actual": 0,
"expected": 0
}
],
"native_blocks": [
{
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"block_index": 2,
"block_sha256": "02ab850dc5d3e90b0aac61390f3c20004b4f6551408a1af07100abefd1b73831",
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"language": "typescript"
}
],
"lint_results": [
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"exit_code": 1,
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{
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"severity": "error"
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{
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"node_api_diagnostics": 0
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{
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{
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"diagnostics": [],
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}
],
"build_results": [
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"source_input_sha256": "20c481f5fdc298b5cb2a42b8b5d2534439752a0b56a3880aa64efa93eddb0ef9",
"network_attempts": 0
},
{
"out_dir": "output-2",
"html_sha256": "345efb27d4f0e873eb1598bf26ac334b1d95e0460617fe865b79f85b3d800bee",
"source_input_sha256": "c1d0da34a427327b81a879d332df96885af0e2276e2bbef7c548dc54063a4119",
"network_attempts": 0
}
],
"unchanged_original_unit_tests": {
"passed": 1,
"failed_expected": 1,
"expected_failure": "Markdown example keeps a leading newline, unlike its original expected string",
"tap_sha256": "543054174278cb07c32e70cb0c8dbd09ba9e9fc0d7711cac693694b0cb518b51"
},
"source_hashes": {
"examples/run_fixture.mjs": "1e4abea4e345802627cd664caf60621277a0524d4efcf6c6fb0a75d7353c9f17",
"examples/deny_network.mjs": "ef76924da542c724cb00cf5152675b3885ef9bfff5e91280f408d64c13c72b3d",
"package.json": "781593050c71122a1d28076904768afb1d58f87f42a324077ff7cb8fe5093ce5",
"package-lock.json": "af00dd3b178aa7505eab9d18e5e82254857a9743466a700847deb0d0b9ebfb90",
"repository-context/biome.jsonc": "61766702c45acd574de0f02fb418f528eec884489f413bd9fba0ef371a7552de",
"repository-context/.agents/skills/astro-developer/testing.md": "e389858edfbce3ed26ea45cca0bb83e315c94f32b053ef0c39e1ae7784ffaee7",
"repository-context/.agents/skills/astro-developer/constraints.md": "e5e20a6db57d2fe5c67bc1a866c2d40bb154d84e288a1b6717e3f48f4eadec95"
},
"synthetic_setup": "Independent wrappers and inputs; full upstream source blocks preserved before Node type erasure; VCS lookup disabled only by the Biome CLI flag.",
"runtime_tested": false,
"ai_client_executed": false,
"production_tested": false,
"paid_api_used": false,
"real_credentials_used": false,
"monorepo_test_runner_used": false,
"esm_cache_pollution_reproduced": false,
"edge_runtime_executed": false,
"full_typescript_typecheck_ran": false,
"astro_build_api_experimental": true,
"javascript_network_preload_denied_build_connections": true,
"resolved_independent_setup_issue": "On Windows, the Node --import preloader requires a file:// URL rather than a C: path."
}Windows; Node 24.10.0; Astro 7.3.7; Biome 2.5.3; synthetic files only. Standalone build API and Node type erasure experimental. No preview server, account, key, database or paid service. Skill snapshot and runtime version identities separate.
Package SHA-256: 6ff1d049520eed60eada682d632f746a065fa7375ec577b5ddda094798d0758f
Outcome recorded: 2026-10-08 03:06 UTC
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