Onyx MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 30 installs a week from npm. Last commit 21 Sep 2026.
Secure MCP access to Onyx search, chat, projects, and administration.
Nothing serious here today
Today is the operative word: we check Onyx MCP every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add onyx-mcp -- npx -y onyx-mcp{
"mcpServers": {
"onyx-mcp": {
"args": [
"-y",
"onyx-mcp"
],
"command": "npx"
}
}
}[mcp_servers.onyx-mcp]
command = "npx"
args = ["-y", "onyx-mcp"]{
"mcpServers": {
"onyx-mcp": {
"args": [
"-y",
"onyx-mcp"
],
"command": "npx"
}
}
}{
"mcpServers": {
"onyx-mcp": {
"args": [
"-y",
"onyx-mcp"
],
"command": "npx"
}
}
}This one needs environment variables set before it will start:
ONYX_API_URL (Onyx API base URL, for example https://onyx.example.com/api), ONYX_API_TOKEN (Onyx Personal Access Token or API key), ONYX_DEFAULT_PERSONA_ID (Default Onyx agent ID for new chats), ONYX_MCP_ENABLE_WEB_FETCH (Enable web search and allowlisted URL fetching), ONYX_MCP_WEB_FETCH_ALLOWLIST (Comma-separated hostnames permitted for HTTPS URL fetching).
The author declared them in the registry entry; get the values from the project itself.
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Onyx MCP — questions
Answers built from our own checks of this server.