Borrowing it
Nothing to install: this file belongs to atlanhq/agent-toolkit. 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/atlanhq/agent-toolkit/main/CLAUDE.mdgit clone --depth 1 https://github.com/atlanhq/agent-toolkitWrote 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/atlanhq/agent-toolkit/claude-md)<a href="https://agentmods.dev/instructions/atlanhq/agent-toolkit/claude-md"><img src="https://agentmods.dev/badge/instructions/atlanhq/agent-toolkit/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/atlanhq/agent-toolkit/claude-md"><img src="https://agentmods.dev/badge/instructions/atlanhq/agent-toolkit/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 | $0.00678 | $0.00678 |
| Opus 5.5 | $0.00271 | $0.00271 |
| Sonnet 5.5 | $0.00136 | $0.00136 |
| Haiku 4.5 | $0.00068 | $0.00068 |
Grade A, and why
agent-toolkit 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 — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Atlan Plugin for Claude Code
You have access to Atlan's context layer through MCP tools. The Atlan MCP server connects via OAuth at mcp.atlan.com/mcp - no API keys required. Use these tools to help users search, explore, govern, and manage their data assets.
Authentication
The Atlan MCP server uses OAuth 2.1 authentication. Users authenticate via the /mcp command in Claude Code, which opens a browser-based login flow. No API keys or environment variables are needed.
Available MCP Tools
12 tools are enabled by default for most customers. 3 additional tools are available but require enablement per tenant via feature flags.
Search & Discovery
semantic_search_tool- Natural language search across all data assets using AI-powered semantic understanding.search_assets_tool(not enabled by default) - Search assets using structured filters and conditions.get_assets_by_dsl_tool(not enabled by default) - Query assets using Atlan's DSL (Domain Specific Language) for advanced filtering.
Lineage
traverse_lineage_tool- Trace data flow upstream (where data comes from) or downstream (where data goes).
Asset Management
update_assets_tool- Update asset descriptions, certificates, README, terms, or custom metadata.
Query
query_assets_tool(not enabled by default) - Execute SQL queries against connected data sources.
Glossary
create_glossaries- Create new glossaries.create_glossary_terms- Create terms within glossaries.create_glossary_categories- Create categories within glossaries.
Data Mesh
create_domains- Create data domains and subdomains.create_data_products- Create data products linked to domains and assets.
Data Quality
create_dq_rules_tool- Create data quality rules (null checks, uniqueness, regex, custom SQL, etc.).update_dq_rules_tool- Update existing DQ rules.schedule_dq_rules_tool- Schedule DQ rule execution with cron expressions.delete_dq_rules_tool- Delete DQ rules.
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 First seen · 57 lines · 678 tokens per session scan A 7a02182270de
agent-toolkit CLAUDE.md is an instructions file published in the GitHub repository atlanhq/agent-toolkit (41 stars, last pushed yesterday), licensed MIT. It adds 678 tokens to every session, about $0.0027 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).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.