Claude Quickstarts is a collection of starter projects for building applications with the Claude API, including customer support, financial analysis, and computer-use examples. Developers use them as foundations to customize for their own deployable applications, and the catalogue add-ons provide workflows for working with these quickstarts.
Borrowing it
Nothing to install: this file belongs to anthropics/claude-quickstarts. 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/anthropics/claude-quickstarts/main/CLAUDE.mdgit clone --depth 1 https://github.com/anthropics/claude-quickstartsWrote 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/anthropics/claude-quickstarts/claude-md)<a href="https://agentmods.dev/instructions/anthropics/claude-quickstarts/claude-md"><img src="https://agentmods.dev/badge/instructions/anthropics/claude-quickstarts/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/anthropics/claude-quickstarts/claude-md"><img src="https://agentmods.dev/badge/instructions/anthropics/claude-quickstarts/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 | $0.00820 | $0.00820 |
| Opus 5.5 | $0.00328 | $0.00328 |
| Sonnet 5.5 | $0.00164 | $0.00164 |
| Haiku 4.5 | $0.00082 | $0.00082 |
Grade A, and why
claude-quickstarts 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 1mo 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 — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Quickstarts Development Guide
Conventions (all quickstarts)
- Name Anthropic SDK client instances
client— e.g.const client = new Anthropic();in TypeScript,client = Anthropic()in Python. This applies to source files and code snippets in READMEs and guides alike. - Never use the "CMA" acronym. Write "Managed Agents" or "Claude Managed Agents" in prose and comments, and spell it out in identifiers, file names, and log prefixes (e.g.
managed-agents.ts, notcma.ts;[managed-agent], not[cma]). - Tag every Managed Agent a quickstart creates with
metadata.anthropic_cookbookset toclaude-quickstarts/<quickstart-directory>(e.g.claude-quickstarts/chat-sdk), inagent.yaml,ant applyfrontmatter, or theagents.createcall. This is how we see which quickstarts people run. Use lowercase letters, digits, and hyphens only, because a value in any other shape is ignored for attribution, with no error to warn you. Sessions inherit the tag from their agent, so session metadata needs nothing.
Legal
- When changes are made to files that have a copyright notice add them to that subdirectory's CHANGELOG.md file.
Computer-Use Demo
Setup & Development
- Setup environment:
./setup.sh - Build Docker:
docker build . -t computer-use-demo:local - Run container:
docker run -e ANTHROPIC_API_KEY=$ANTHROPIC_API_KEY -v $(pwd)/computer_use_demo:/home/computeruse/computer_use_demo/ -v $HOME/.anthropic:/home/computeruse/.anthropic -p 5900:5900 -p 8501:8501 -p 6080:6080 -p 8080:8080 -it computer-use-demo:local
Testing & Code Quality
- Lint:
ruff check . - Format:
ruff format . - Typecheck:
pyright - Run tests:
pytest - Run single test:
pytest tests/path_to_test.py::test_name -v
Code Style
- Python: snake_case for functions/variables, PascalCase for classes
- Imports: Use isort with combine-as-imports
- Error handling: Use custom ToolError for tool errors
- Types: Add type annotations for all parameters and returns
- Classes: Use dataclasses and abstract base classes
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.
- 1mo ago Changed · +1 lines · +122 tokens per session d1b5c560ddcd
- 1mo ago First seen · 67 lines · 698 tokens per session scan A 1c6493d24070
claude-quickstarts CLAUDE.md is an instructions file published in the GitHub repository anthropics/claude-quickstarts (18,959 stars, last pushed today), licensed MIT. It adds 820 tokens to every session, about $0.0033 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 2026-08-30.
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.
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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.