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mnehmos.open5e.mcp

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MCP server for Open5e API - D&D 5e game data with consumer queries and contributor workflows

Package Exports

  • mnehmos.open5e.mcp
  • mnehmos.open5e.mcp/dist/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (mnehmos.open5e.mcp) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

mnehmos.open5e.mcp

MCP server for Open5e - Query D&D 5e game data and contribute to the open-source database

Tests License: MIT Node

A dual-mode MCP server that provides:

  • Consumer Mode: Query spells, monsters, items, conditions, and more from 22+ source books
  • Contributor Mode: Validate entries, check for collisions, diff against live API, and generate PR-ready JSON
  • RAG Developer Chatbot: Search and chat with Open5e repository documentation

Features

Category Tools What It Does
Consumer 6 tools Search, get, list, batch fetch D&D 5e content
Contributor 5 tools Validate schemas, check slugs, diff entries, generate PRs
RAG 5 tools Search repo docs, chat with AI about contributing
Meta 3 tools Health checks, list documents/endpoints

Installation

npm

npm install -g mnehmos.open5e.mcp

From Source

git clone https://github.com/Mnehmos/mnehmos.open5e.mcp.git
cd mnehmos.open5e.mcp
npm install
npm run build

Claude Desktop Configuration

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "mnehmos.open5e.mcp": {
      "command": "node",
      "args": ["path/to/mnehmos.open5e.mcp/dist/index.js"]
    }
  }
}

Or if installed globally:

{
  "mcpServers": {
    "mnehmos.open5e.mcp": {
      "command": "mnehmos-open5e-mcp"
    }
  }
}

Quick Start

Search for Spells

Search: "fireball"
→ Returns Fireball, Delayed Blast Fireball from multiple sources

Get a Monster

Get: monsters/goblin
→ Full stat block with AC, HP, abilities, actions, environments

Validate a Contribution

Validate: { name: "Custom Spell", level: 3, school: "Evocation", ... }
→ Errors for missing required fields
→ Suggestions for slug format
→ Warnings for unusual values

Tool Reference

Consumer Tools

Search across all Open5e resources with optional filters.

search({
  query: "fireball",
  resource_type: "spells",      // optional: spells, monsters, items, etc.
  document_slug: "srd-2014",    // optional: filter by source book
  limit: 10                     // optional: max results (default 20)
})

Returns results with slug, key (for v2 resources), name, excerpt, and web_url.

get

Fetch a single resource by slug. Auto-tries common document prefixes for v2 resources.

// Simple slug - auto-discovers the full key
get({ resource_type: "spells", slug: "fireball" })
// → Finds srd-2024_fireball or srd-2014_fireball

// Full key - direct lookup
get({ resource_type: "spells", slug: "srd-2014_fireball" })

list

List resources with filters (pagination supported).

list({
  resource_type: "monsters",
  cr: 3,                        // Challenge Rating
  document_slug: "wotc-srd",    // Source book
  type: "Dragon",               // Creature type
  limit: 20,
  offset: 0
})

list({
  resource_type: "spells",
  level: 3,                     // Spell level (0-9)
  school: "Evocation",          // Spell school
  document_slug: "srd-2014"
})

batch_get

Fetch multiple resources in parallel (max 50).

batch_get({
  requests: [
    { resource_type: "monsters", slug: "goblin" },
    { resource_type: "monsters", slug: "kobold" },
    { resource_type: "conditions", slug: "blinded" }
  ]
})

list_documents

List all available source books.

list_documents()
// → srd-2014, srd-2024, tob, tob2, tob3, a5e-ag, bfrd, etc.

list_endpoints

List all API endpoints with version info.

list_endpoints()
// → spells (v2), monsters (v1), conditions (v2), etc.

Contributor Tools

validate_entry

Validate a draft entry against Open5e schema.

validate_entry({
  resource_type: "spells",
  data: {
    name: "Test Spell",
    slug: "test-spell",
    level: 3,
    school: "Evocation",
    // ... other fields
  },
  strict: false  // optional: fail on warnings
})

Returns:

  • valid: boolean
  • errors: Array of schema violations
  • warnings: Unusual but valid values
  • suggestions: Helpful hints (slug format, valid enums)

check_slug

Check if a slug exists or would collide.

check_slug({
  resource_type: "monsters",
  slug: "goblin",
  document_slug: "wotc-srd",     // optional
  original_slug: "goblin-old"    // optional: detect mutations
})

Returns:

  • exists: boolean
  • is_mutation: boolean (slug changed from original)
  • collision_risk: "none" | "same_document" | "different_document"
  • existing_entry: Details if exists

diff

Compare a draft entry against the live API version.

diff({
  resource_type: "monsters",
  slug: "goblin",
  draft: {
    name: "Goblin",
    hit_points: 10,  // Changed from 7
    // ... partial or full entry
  },
  ignore_fields: ["page_no"]  // optional
})

Returns field-by-field diff with type: "added" | "removed" | "modified".

normalize

Clean up and standardize entry data.

normalize({
  resource_type: "spells",
  data: {
    name: "test   spell",
    desc: "A   spell   with   bad   spacing.\n\nAnd extra   newlines."
  },
  options: {
    fix_whitespace: true,
    fix_markdown: true,
    standardize_names: true,
    generate_slug: true
  }
})

generate_pr_json

Generate PR-ready JSON with file path and checklist.

generate_pr_json({
  resource_type: "spells",
  document_slug: "srd-2014",
  operation: "add",  // or "modify"
  data: { /* validated entry */ }
})

Returns:

  • json_output: Formatted JSON string
  • file_path: Where to place the file (e.g., data/srd-2014/spells/test-spell.json)
  • validation: Pre-flight validation results
  • checklist: PR submission checklist

RAG Tools

The RAG tools connect to the Open5e Developer Chatbot, which indexes the entire open5e-api and open5e (frontend) repositories.

rag_health

Check RAG service status.

rag_health()
// → { healthy: true, chunks: 484, vectors: 484, sources: 214 }

rag_stats

Get index statistics.

rag_stats()
// → Project info, chunk/vector counts, embedding status

rag_sources

List all indexed sources with GitHub URLs.

rag_sources()
// → README.md, CONTRIBUTING.md, AGENTS.md, models/*.py, views/*.py, etc.

Search repository documentation.

rag_search({
  query: "how to add a new monster",
  mode: "hybrid",    // semantic, keyword, or hybrid
  top_k: 5
})

Returns chunks with scores, source URLs, and positions.

rag_chat

Chat with AI about Open5e development.

rag_chat({
  message: "How do I add a new monster to the Open5e database?",
  history: [],  // optional: conversation history
  top_k: 5      // optional: context chunks
})

Returns detailed answer with source citations.

Meta Tools

health_check

Check API connectivity and cache status.

health_check()
// → { api_reachable: true, api_latency_ms: 628, cache_status: {...}, version: "0.1.0" }

Available Source Books

Slug Name Publisher
srd-2014 System Reference Document 5.1 Wizards of the Coast
srd-2024 System Reference Document 5.2 Wizards of the Coast
tob Tome of Beasts Kobold Press
tob-2023 Tome of Beasts (2023) Kobold Press
tob2 Tome of Beasts 2 Kobold Press
tob3 Tome of Beasts 3 Kobold Press
a5e-ag Adventurer's Guide (A5E) EN Publishing
a5e-mm Monstrous Menagerie (A5E) EN Publishing
bfrd Black Flag Reference Document Kobold Press
deepm Deep Magic Kobold Press
... 22 total sources

Use list_documents() for the complete list.

Resource Types

Type API Version Filters Available
spells v2 level, school, document_slug
monsters v1 cr, type, document_slug
conditions v2 document_slug
items v1 document_slug
magicitems v1 document_slug
weapons v2 document_slug
armor v2 document_slug
feats v2 document_slug
backgrounds v2 document_slug
races v2 document_slug
classes v1 document_slug

Usage Patterns

Game Master: Building an Encounter

// Find CR 3 monsters from the SRD
const monsters = await list({
  resource_type: "monsters",
  cr: 3,
  document_slug: "wotc-srd"
});

// Get full details for selected monsters
const details = await batch_get({
  requests: monsters.results.slice(0, 5).map(m => ({
    resource_type: "monsters",
    slug: m.slug
  }))
});

Contributor: Adding a New Spell

// 1. Draft the spell
const draft = {
  name: "Arcane Bolt",
  slug: "arcane-bolt",
  level: 0,
  school: "Evocation",
  casting_time: "1 action",
  range: "120 feet",
  verbal: true,
  somatic: true,
  material: false,
  concentration: false,
  ritual: false,
  duration: "Instantaneous",
  desc: "You hurl a bolt of arcane energy at a creature...",
  document__slug: "homebrew"
};

// 2. Validate
const validation = await validate_entry({
  resource_type: "spells",
  data: draft
});

// 3. Check for collisions
const slugCheck = await check_slug({
  resource_type: "spells",
  slug: "arcane-bolt"
});

// 4. Generate PR JSON
const prData = await generate_pr_json({
  resource_type: "spells",
  document_slug: "homebrew",
  operation: "add",
  data: draft
});

Learning: Understanding the Codebase

// Search for how monsters are modeled
const results = await rag_search({
  query: "Monster model fields actions abilities",
  top_k: 5
});

// Ask the chatbot
const answer = await rag_chat({
  message: "What fields are required for a monster entry in v1?"
});

Integration

rpg-mcp

This server is designed to integrate with rpg-mcp for live creature lookups during gameplay:

// Replace hardcoded creature presets with Open5e lookups
const creature = await open5e.get({
  resource_type: "monsters",
  slug: "adult-red-dragon"
});

Quest Keeper AI

Surface contributor workflows in the Quest Keeper AI frontend for community content creation.

Development

Setup

npm install
npm run build

Testing

npm test              # Run all tests
npm run test:watch    # Watch mode
npm run test:coverage # Coverage report

Scripts

Command Description
npm run build Compile TypeScript
npm run dev Watch mode compilation
npm start Run the server
npm test Run tests
npm run lint Lint source files
npm run typecheck Type check without emit

Project Structure

src/
├── index.ts          # MCP server entry point, tool registration
├── types.ts          # Shared TypeScript types
├── api/              # Open5e API client
├── cache/            # Response caching
├── contributor/      # Validation, diff, PR generation
├── schema/           # Zod schemas for all resource types
└── utils/            # Helpers, slug handling

API Reference

Contributing

  1. Fork the repository
  2. Create a feature branch
  3. Run tests: npm test
  4. Submit a pull request

License

MIT © Mnehmos


Part of the Mnehmos MCP ecosystem