What is dnd-mcp CLAUDE.md?

A development guide for DND-MCP, a Python server that provides access to Dungeons & Dragons data through an AI tool interface.

Use it when installing dependencies, running the server or tests, and developing its cached D&D API resources.

It keeps setup, code style, testing, error handling, and the server’s structure consistent across changes.

How procload/dnd-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to procload/dnd-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/procload/dnd-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/procload/dnd-mcp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/procload/dnd-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/procload/dnd-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/procload/dnd-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/procload/dnd-mcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/procload/dnd-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/procload/dnd-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 216 This file is loaded in full into every session.

When invoked 216 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00216	$0.00216
Opus 5.5	$0.00086	$0.00086
Sonnet 5.5	$0.00043	$0.00043
Haiku 4.5	$0.00022	$0.00022

Measured 2mo ago against content hash 07d3aa94e52d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

dnd-mcp 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 2mo 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.

CLAUDE.md · 21 lines

What it actually says

DND-MCP Development Guide

Commands

Run server: uv run python dnd_mcp_server.py
Run tests: uv run python simple_fastmcp_test.py
Install dependencies: uv pip install -r requirements.txt

Code Style

Imports: Group imports: standard library, third-party, local
Formatting: 4-space indentation, max line length ~100 chars
Types: Use typing hints (from typing import List, Dict, Any, Optional)
Error handling: Use try/except with specific exceptions and logging
Logging: Use Python's logging module with appropriate levels
Documentation: Docstrings for all functions/classes following Google style
Variable naming: snake_case for variables/functions, UPPER_CASE for constants

Architecture

MCP server using FastMCP framework
Resources for D&D API access with persistent caching
Handle API failures gracefully with informative error messages
Use async/await patterns for concurrent operations

Changes

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.

2mo ago First seen · 21 lines · 216 tokens per session scan A 07d3aa94e52d

Subscribe to this mod's changes

dnd-mcp CLAUDE.md is an instructions file published in the GitHub repository procload/dnd-mcp (53 stars, last pushed 1y ago), licensed MIT. It adds 216 tokens to every session, about $0.0009 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.

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dnd-mcp: Instructions file for Claude Code