OpenMCP

1# OpenMCP
2 
3https://www.open-mcp.org
4 
5OpenMCP is both:
6 
71. a standard for converting web APIs into MCP servers
82. an open source registry of servers which follow the standard
9 
10Each OpenMCP server gives MCP clients the ability to make requests to a particular web API in a token-efficient way. Together the servers in the registry represent a broad range of services, empowering the underlying client LLMs to fetch data and perform actions on behalf of their users across many domains.
11 
12## Contents
13 
14- [Creating a server](#creating-a-server)
15- [Adding OpenMCP servers to MCP clients](#adding-openmcp-servers-to-mcp-clients)
16- [Converting web API -> OpenMCP](#converting-web-api---openmcp)
17 
18## Creating a server
19 
20https://www.open-mcp.org/servers/creating-a-server
21 
22## Adding OpenMCP servers to MCP clients
23 
24### Remote hosting
25 
26...
27 
28### Local hosting
29 
30<div>
31  <a href="https://www.loom.com/share/aa26fed41f084ff1bd115436f9d799dd">
32    <p>Local hosting demo - watch video</p>
33  </a>
34  <a href="https://www.loom.com/share/aa26fed41f084ff1bd115436f9d799dd">
35    <img style="max-width:300px;" src="https://cdn.loom.com/sessions/thumbnails/aa26fed41f084ff1bd115436f9d799dd-9815ccb91b155b9d-full-play.gif">
36  </a>
37</div>
38 
39#### Requirements:
40 
41- Node.js v18 or later (includes npx and npm)
42 
43#### Claude desktop
44 
45```bash
46npx @open-mcp/config add {server-id} \
47  ~/Library/Application\ Support/Claude/claude_desktop_config.json \
48  --ENV_VAR=abc123
49```
50 
51Now restart Claude desktop to load the tools.
52 
53#### Cursor
54 
55Run this from the root of your project directory or, to add to all cursor projects, run it from your home directory `~`.
56 
57```bash
58npx @open-mcp/config add {server-id} \
59  .cursor/mcp.json \
60  --ENV_VAR=abc123
61```
62 
63Now go to `Cursor > Settings > Cursor Settings` then click `MCP` to ensure the server is enabled.
64 
65#### Other clients
66 
67```bash
68npx @open-mcp/config add {server-id} \
69  /path/to/config.json \
70  --ENV_VAR=abc123
71```
72 
73#### Alternatives
74 
75If you don't want to use the CLI you can use `npm` to install the package manually, then add a `node` command to your client config with an absolute path to `dist/index.js`. See the individual server READMEs for more details.
76 
77## Converting web API -> OpenMCP
78 
79### REST `openapi.yaml` / `openapi.json`
80 
81...
82 
83### gRPC `service.proto`
84 
85...
86 
87### JSON-RPC `openrpc.json`
88 
89...
90 
91### GraphQL `schema.gql`
92 
93...
94 
95### SOAP `service.wsdl`
96 
97...
98 
99### PostgREST `schema.sql`
100 
101...
102