Summary
Wraps the Datamuse API to give Claude synonym and rhyme lookup without any authentication overhead. You get two tools: find_synonyms and find_rhymes, both returning scored results from Datamuse's free tier. Hosted through Pipeworx's gateway infrastructure, so there's no local server to run. Good for writing assistance workflows where you need lexical alternatives on demand. The same gateway offers an ask_pipeworx tool that interprets natural language queries if you'd rather skip direct tool calls. Part of a larger gateway setup that bundles 673+ data sources, though you can use just the words endpoint standalone.
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Words MCP — wraps Datamuse API (free, no auth required)
Part of Pipeworx — an MCP gateway connecting AI agents to 1684+ live data sources.
Tools
| Tool | Description |
|---|---|
find_synonyms | Find synonyms for an English word using the Datamuse word API (rel_syn), ranked by the Datamuse similarity score, with a limit on how many come back (default 10). Returns each candidate word with its score. Answers what another word for a given term is when writing, editing, or paraphrasing English prose. |
find_rhymes | Find words that rhyme with a given word, ranked by score. |
find_related | Find words related to a given word by a specific relation type. Relation types: "syn" (synonyms), "ant" (antonyms), "rhy" (rhymes), "trg" (triggers/associated words), "jja" (adjectives for a noun), "jjb" (nouns for an adjective). |
autocomplete | Return word completions for a given prefix string using the Datamuse suggestion endpoint. Takes a prefix (e.g., "hel") and returns matching words ranked by score (e.g., "hello", "help", "helpless"). |
find_words | Advanced word search. Find words matching a combination of meaning, pronunciation, and spelling constraints. |
Quick Start
Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):
{
"mcpServers": {
"words": {
"url": "https://gateway.pipeworx.io/words/mcp"
}
}
}
What this endpoint actually serves
tools/list at https://gateway.pipeworx.io/words/mcp returns the tools in the table
above plus the shared Pipeworx meta-tools — ask_pipeworx,
discover_tools, search_within, remember/recall and the rest of the
gateway-wide set. So the tool count you see is larger than this table: a
single-pack endpoint currently lists roughly 30 shared tools alongside the
pack's own. The connection's initialize response states its exact scope, and
is the authoritative answer for a given day.
This is deliberate, not multiplexing by accident. The meta-tools are what let a
scoped connection answer a question this pack does not cover — via
ask_pipeworx, which routes across the whole catalog — without you adding a
second MCP server. There is currently no way to mount a pack endpoint without
them; if the extra schemas cost you more context than the routing is worth,
connect to the full gateway once rather than to several pack endpoints.
Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:
{
"mcpServers": {
"pipeworx": {
"url": "https://gateway.pipeworx.io/mcp"
}
}
}
Both URLs reach the same gateway and the same 1684+ data sources. The
only difference is which pack's tools are listed directly; ask_pipeworx
reaches all of them from either one.
No MCP client? Call it over HTTP
curl -X POST https://gateway.pipeworx.io/v1/tools/find_synonyms \
-H 'Content-Type: application/json' \
-d '{"word":"happy"}'
No account needed for the first calls. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/find_synonyms. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.
Standalone (no gateway account)
This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:
{
"mcpServers": {
"words": {
"command": "npx",
"args": ["-y", "@pipeworx/mcp-words"]
}
}
}
Or run it directly to confirm it starts:
npx -y @pipeworx/mcp-words
It speaks MCP over stdin/stdout and answers initialize/tools/list/tools/call
for only this pack's tools — none of the shared meta-tools the gateway
connection above adds. Same source, same tools, no ask_pipeworx routing.
Using with ask_pipeworx
Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:
ask_pipeworx({ question: "your question about Words data" })
The gateway picks the right tool and fills the arguments automatically.
More
License
MIT
Featured
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →