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Datamuse MCP

Official registry Other

MCP server for Datamuse word-finding API

Source code Documentation

What can you do with Datamuse MCP?

  • find_synonyms
  • find_antonyms
  • find_rhymes
  • find_similar_sounding
  • find_by_pattern
  • find_related_words
  • find_adjectives_for_noun
  • find_nouns_for_adjective

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package datamuse-mcp
Claude Code 
claude mcp add datamuse-mcp -- npx -y datamuse-mcp@1.0.0
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "datamuse-mcp": {
            "command": "npx",
            "args": [
                "-y",
                "datamuse-mcp@1.0.0"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. datamuse-mcp
  2. About
  3. Purpose
  4. Requirements
  5. Install
  6. Development
  7. Build & run
  8. Manual JSON-RPC checks
  9. More tool examples
  10. Claude Desktop configuration
  11. Exposed tools
  12. Security and limits
  13. Publishing
  14. Contributing
  15. License

datamuse-mcp

MCP server for the Datamuse API (word search, rhymes, synonyms, and more).

This project is open source, free to use, and licensed under MIT.

About

datamuse-mcp is a local stdio MCP server that wraps Datamuse endpoints into validated MCP tools. It is designed for practical word-finding use cases in assistants and clients that support MCP.

Purpose

This server provides simple MCP tools to:

  • find synonyms, antonyms, and rhymes;
  • run autocomplete;
  • fetch lexical details (definitions, POS, syllables, pronunciation, frequency);
  • search by spelling pattern (*, ?) or phonetic similarity.

Requirements

  • Node.js >= 18
  • npm

Install

npm install

Development

npm run dev

Build & run

npm run build
npm start

Manual JSON-RPC checks

# List tools
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' | node dist/index.js

# Call a tool
echo '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"find_synonyms","arguments":{"word":"happy"}}}' | node dist/index.js

More tool examples

{ "tool": "find_antonyms", "arguments": { "word": "happy", "max": 10 } }
{ "tool": "find_rhymes", "arguments": { "word": "love", "type": "perfect", "max": 20 } }
{ "tool": "find_similar_sounding", "arguments": { "text": "definately", "max": 15 } }
{ "tool": "find_by_pattern", "arguments": { "pattern": "s??r?", "meaning_hint": "celestial", "max": 25 } }
{ "tool": "find_related_words", "arguments": { "word": "music", "relation_type": "triggers", "max": 15 } }
{ "tool": "get_word_info", "arguments": { "word": "serendipity" } }
{ "tool": "autocomplete", "arguments": { "prefix": "astro", "max": 10 } }

Claude Desktop configuration

Add this to claude_desktop_config.json:

{
  "mcpServers": {
    "datamuse": {
      "command": "node",
      "args": ["/absolute/path/to/datamuse-mcp/dist/index.js"]
    }
  }
}

Exposed tools

  • find_synonyms
  • find_antonyms
  • find_rhymes
  • find_similar_sounding
  • find_by_pattern
  • find_related_words
  • find_adjectives_for_noun
  • find_nouns_for_adjective
  • get_word_info
  • autocomplete

Security and limits

  • The server runs over stdio (local usage recommended).
  • Outbound requests go to https://api.datamuse.com.
  • A local in-memory cache is used (5-minute TTL), with no disk persistence.
  • Datamuse may enforce request limits/quotas.

Publishing

For npm and MCP Registry deployment, see PUBLISHING.md.

Contributing

See CONTRIBUTING.md.

License

MIT — see LICENSE.

Frequently asked questions

What is Datamuse MCP?

MCP server for Datamuse word-finding API

How do I install Datamuse MCP?

It runs on your machine. In Claude Code: claude mcp add datamuse-mcp -- npx -y datamuse-mcp@1.0.0. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Datamuse MCP need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Datamuse MCP open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Datamuse MCP?

It is published by lacausecrypto. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.