Borrowing it
Nothing to install: this file belongs to nananaman/DuckDB-RAG-MCP-Sample. 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/nananaman/DuckDB-RAG-MCP-Sample/main/CLAUDE.mdgit clone --depth 1 https://github.com/nananaman/DuckDB-RAG-MCP-SampleWrote 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/nananaman/duckdb-rag-mcp-sample/claude-md)<a href="https://agentmods.dev/instructions/nananaman/duckdb-rag-mcp-sample/claude-md"><img src="https://agentmods.dev/badge/instructions/nananaman/duckdb-rag-mcp-sample/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/nananaman/duckdb-rag-mcp-sample/claude-md"><img src="https://agentmods.dev/badge/instructions/nananaman/duckdb-rag-mcp-sample/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 | $0.00262 | $0.00262 |
| Opus 5 | $0.00131 | $0.00131 |
| Sonnet 5 | $0.00052 | $0.00052 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
DuckDB-RAG-MCP-Sample 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 9d 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.
What it actually says
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Communication Guidelines
日本語で話すようにしてください
Commands
- Run application:
uv run main.py <args> - FastMCP server:
uv run mcp dev server.py - Formatting:
mise run fmt - Linting:
mise run lint - Testing:
mise run test
Code Style Guidelines
- Naming: Use snake_case for variables, functions, and modules
- Typing: Include type hints for all function parameters and return values
- Imports: Group imports as: stdlib, third-party, local modules
- Docstrings: Use Google-style docstrings for all functions
- Error handling: Use specific exception types with descriptive messages
- Resource management: Ensure proper cleanup of database connections
- Testing: Include tests for new functionality
- Formatting: Follow PEP 8 conventions with 88-character line limit
Project Structure
- Main functionality in
main.py(CLI tool) - Server implementation in
server.py(FastMCP API) - Vector data stored in
vectors.parquet
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.
- 9d ago First seen · 29 lines · 262 tokens per session scan A 5a45c6ceafb4
DuckDB-RAG-MCP-Sample CLAUDE.md is an instructions file published in the GitHub repository nananaman/DuckDB-RAG-MCP-Sample (4 stars, last pushed 1y ago), licensed Apache-2.0. It adds 262 tokens to every session, about $0.0013 per session on Opus 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.
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