Datamuse MCP

io.github.lacausecryptoPublished by GitHub account lacausecryptov1.0.0Updated Oct 25, 2026

MCP server for Datamuse word-finding API

VerifiedSTDIODesktop onlyWeb Search & ScrapingKnowledge & Memory

Overview

AI-generated overview

A local MCP server that wraps the Datamuse word-finding API, letting an assistant look up synonyms, antonyms, rhymes, word details and autocomplete suggestions.

What you can do
Find synonyms, antonyms and rhymes for a word, with rhyme type and result limits selectable. Find words that sound similar or match a spelling pattern, optionally narrowed by a meaning hint. Find related words by relation type, plus adjectives for a noun and nouns for an adjective. Fetch lexical details such as definitions, part of speech, syllables, pronunciation and frequency. Get autocomplete suggestions for a prefix.
When to use it
Useful when writing or editing prose, poetry or lyrics and you want the assistant to suggest alternatives, rhymes or near-matches. Also handy for vocabulary questions about a specific word's meaning, pronunciation or frequency.
Requirements
Runs locally over stdio as an npm package; needs Node.js 18 or later and npm. No authentication, API key or environment variables are declared. Outbound network access to the Datamuse API is required.
Before you install
Word lookups are sent to the external Datamuse service, so queries leave the machine. Datamuse may enforce request limits or quotas. Results are cached in memory for five minutes only, with no disk persistence. The server is read-only and does not modify data.

Installation

In SourceWeft

  1. Open Datamuse MCP in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

datamuse-mcp

[npm version] [npm downloads] [license] [node] [github release] [publish workflow]

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

bash
npm install

Development

bash
npm run dev

Build & run

bash
npm run buildnpm start

Manual JSON-RPC checks

bash
# List toolsecho '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' | node dist/index.js
# Call a toolecho '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"find_synonyms","arguments":{"word":"happy"}}}' | node dist/index.js

More tool examples

json
{ "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:

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.

Source: README.md at commit 5ae4854

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts