What is Datamuse MCP?

MCP server for Datamuse word-finding API

How do I install Datamuse MCP?

Clone Datamuse MCP from https://github.com/lacausecrypto/datamuse-mcp and configure it as an MCP server in your client (Claude Desktop, Cursor, or VS Code).

Is Datamuse MCP open source?

Yes, Datamuse MCP is open source under the MIT license. Source code is available at https://github.com/lacausecrypto/datamuse-mcp.

What category does Datamuse MCP belong to?

Datamuse MCP is listed under Other MCP servers on MCPFind.

Datamuse MCP — MCP Server for Other

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.

Set up in your AI client

AI clientOperating system

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json

{
  "mcpServers": {
    "io-github-lacausecrypto-datamuse-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "datamuse-mcp"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Compatible MCP Clients

Datamuse MCP works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.

Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.

VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.

Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.

Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

Datamuse MCP