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Add warning about MCP server default arguments #152

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Sep 2, 2025
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Add warning about MCP server default arguments #152

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18 changes: 18 additions & 0 deletions docs/toolhive/guides-cli/run-mcp-servers.mdx
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Expand Up @@ -150,6 +150,24 @@ thv run my-mcp-server:latest -- --arg1 value1 --arg2 value2

Check the MCP server's documentation for the required arguments.

:::warning

Some MCP servers in the ToolHive registry include default arguments that are
essential for proper operation. When you provide custom arguments using
`-- <ARGS>`, these replace the registry defaults entirely rather than adding to
them.

Before adding custom arguments, check the server's registry entry:

```bash
thv registry info <SERVER> --format json | jq '.args'
```

If default arguments are listed, include them along with your custom arguments
to ensure the server functions correctly.

:::

### Run a server on a specific port

ToolHive creates a reverse proxy on a random port that forwards requests to the
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