Borrowing it
Nothing to install: this file belongs to astriaai/skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/astriaai/skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/astriaai/skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/astriaai/skills/claude-md)<a href="https://agentmods.dev/instructions/astriaai/skills/claude-md"><img src="https://agentmods.dev/badge/instructions/astriaai/skills/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/astriaai/skills/claude-md"><img src="https://agentmods.dev/badge/instructions/astriaai/skills/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00712 | $0.00712 |
| Opus 5.5 | $0.00285 | $0.00285 |
| Sonnet 5.5 | $0.00142 | $0.00142 |
| Haiku 4.5 | $0.00071 | $0.00071 |
Grade A, and why
skills CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 15d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Astria skills — repository guide
The canonical public skills live in top-level <name>/SKILL.md directories.
For database-backed workflows, the full recipe is owned by the private
sdbooth/doc/skills/ source and published through agent_skills:sync. Public
mux and fashion-music-track skills are loaders only: preserve their names
and triggers, and read their instructions with get_skill. Change recipes in
the private source; do not copy them into the public skills or packaging.
Source manifests and assets live in packaging/; generated packages and
marketplaces live under ignored dist/marketplace/ and ship as release ZIPs. The Astria web-agent sandbox also bundles these
skills with its independently authenticated CLI and private embedded skills.
API transport
Installed plugins use OAuth-connected Astria MCP tools for supported API operations. The host owns login, token storage and refresh. Use live tool schemas; names may have a host namespace. Never read host credentials or silently fall back to the CLI after an MCP authentication failure.
The CLI remains available for local files, downloads, video inspection/Variate,
workspace/template creation, landing pages, board edits and agent handoff.
It has separate authentication. The embedded Astria web-agent sandbox may
expose only the authenticated CLI; preserve that supported environment.
Conditional instructions live in astria-api/references/cli.md, not in the
default MCP entrypoint. Never build a second API client in skills.
bin/astria is vendored from astriaai/cli.
Change the canonical CLI there, then run scripts/sync-cli.sh [ref]. Shared
operation definitions and argparse generate MCP schemas; add new remote-safe
parameters there and synchronize Rails through bin/sync-astria-mcp.
Packaging
packaging/marketplaces/claude.jsonowns the canonical skill list. Add each skill as a"./<name>"path.mcp.jsonowns the portable HTTPS endpoint.scripts/sync-plugin.pygenerates root and packaged.mcp.jsonHTTP compatibility configs.scripts/sync-plugin.sh --no-local-linkscopies canonical skills (including references), manifests, MCP configuration and the vendored CLI todist/marketplace/plugins/. Without that flag it also refreshes developer symlinks.- Never commit generated plugin copies. Build
--target marketplacefor the complete installable marketplace ZIP; individual targets remain upload ZIPs. - No SessionStart CLI-auth hook: OAuth is managed by the host.
- Keep skill frontmatter descriptions focused; retain shell permissions only for skills that actually need optional terminal workflows.
- Public skills must not depend on private web-chat browser command protocols. Composer tools apply only when the host exposes them.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 15d ago Changed · +5 lines · +86 tokens per session 64274f84a72f
- 17d ago Changed · +2 lines · +42 tokens per session a7b786d76b66
- 29d ago Changed · -13 lines · -171 tokens per session scan C → A 2c1e5d110270
- 1mo ago Changed · +2 lines · +35 tokens per session de988b89d6f0
- 2mo ago First seen · 66 lines · 720 tokens per session scan C 5e759cad4b13
skills CLAUDE.md is an instructions file published in the GitHub repository astriaai/skills (2 stars, last pushed 6d ago), licensed MIT. It adds 712 tokens to every session, about $0.0028 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).