Onyx MCP

io.github.ByWaleed/onyx-mcp · v0.2.1

Secure MCP access to Onyx search, chat, projects, and administration.

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add onyx-mcp -e ONYX_API_URL=<ONYX_API_URL> -e ONYX_API_TOKEN=<ONYX_API_TOKEN> -e ONYX_DEFAULT_PERSONA_ID=<ONYX_DEFAULT_PERSONA_ID> -e ONYX_MCP_ENABLE_WEB_FETCH=<ONYX_MCP_ENABLE_WEB_FETCH> -e ONYX_MCP_WEB_FETCH_ALLOWLIST=<ONYX_MCP_WEB_FETCH_ALLOWLIST> -- npx -y [email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "onyx-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "ONYX_API_URL": "<ONYX_API_URL>",
        "ONYX_API_TOKEN": "<ONYX_API_TOKEN>",
        "ONYX_DEFAULT_PERSONA_ID": "<ONYX_DEFAULT_PERSONA_ID>",
        "ONYX_MCP_ENABLE_WEB_FETCH": "<ONYX_MCP_ENABLE_WEB_FETCH>",
        "ONYX_MCP_WEB_FETCH_ALLOWLIST": "<ONYX_MCP_WEB_FETCH_ALLOWLIST>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "onyx-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "ONYX_API_URL": "<ONYX_API_URL>",
        "ONYX_API_TOKEN": "<ONYX_API_TOKEN>",
        "ONYX_DEFAULT_PERSONA_ID": "<ONYX_DEFAULT_PERSONA_ID>",
        "ONYX_MCP_ENABLE_WEB_FETCH": "<ONYX_MCP_ENABLE_WEB_FETCH>",
        "ONYX_MCP_WEB_FETCH_ALLOWLIST": "<ONYX_MCP_WEB_FETCH_ALLOWLIST>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "onyx-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "ONYX_API_URL": "<ONYX_API_URL>",
        "ONYX_API_TOKEN": "<ONYX_API_TOKEN>",
        "ONYX_DEFAULT_PERSONA_ID": "<ONYX_DEFAULT_PERSONA_ID>",
        "ONYX_MCP_ENABLE_WEB_FETCH": "<ONYX_MCP_ENABLE_WEB_FETCH>",
        "ONYX_MCP_WEB_FETCH_ALLOWLIST": "<ONYX_MCP_WEB_FETCH_ALLOWLIST>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`ONYX_API_URL` Required	Onyx API base URL, for example https://onyx.example.com/api
`ONYX_API_TOKEN` Required, secret	Onyx Personal Access Token or API key
`ONYX_DEFAULT_PERSONA_ID` Optional	Default Onyx agent ID for new chats
`ONYX_MCP_ENABLE_WEB_FETCH` Optional	Enable web search and allowlisted URL fetching
`ONYX_MCP_WEB_FETCH_ALLOWLIST` Optional	Comma-separated hostnames permitted for HTTPS URL fetching

Details

Package	`[email protected]` (NPM, stdio)
First published	30 Aug 2026
Last updated	30 Aug 2026
Registry name	`io.github.ByWaleed/onyx-mcp`

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Local install

Installed and run on your own machine, so there is no public endpoint to check.

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