Gantt charts in Any other client

Set it up in 5 steps

1. 1

   Try the native HTTP block first — add this to the client's mcpServers config file. Key names differ per client: Claude Code requires the `type` field (an entry with `url` but no `type` is a hard configuration error), VS Code uses the same object under a `servers` key in `.vscode/mcp.json`, and Cursor uses `mcpServers` in `.cursor/mcp.json` with a bare `url` and no `type`.

   {
     "mcpServers": {
       "gantt": {
         "type": "http",
         "url": "https://gantt.nare.li/api/mcp"
       }
     }
   }

2. 2

   If the client is stdio-only, or speaks HTTP but can't run the MCP OAuth flow, bridge it with mcp-remote and force HTTP transport. `--transport http-only` is required here: the default `http-first` strategy falls back to SSE on a 404, and this server has no SSE endpoint.

   {
     "mcpServers": {
       "gantt": {
         "command": "npx",
         "args": [
           "-y",
           "mcp-remote@latest",
           "https://gantt.nare.li/api/mcp",
           "--transport",
           "http-only"
         ]
       }
     }
   }

3. 3

   Restart the client and finish the browser consent screen that opens on first connect. mcp-remote listens on port 3334 for the OAuth redirect by default (pass a port number as an extra argument after the URL to change it; if the port is busy it picks a random open one).

4. 4

   If auth loops or tokens go stale, clear the bridge's credential cache and restart the client. Add `--debug` to write a verbose auth log to the same directory.

   rm -rf ~/.mcp-auth

5. 5

   Calling the Messages API directly? Attach it as an MCP connector — but note this path does NOT run OAuth for you: you must obtain and refresh the access token yourself.

   curl https://api.anthropic.com/v1/messages \
     -H "Content-Type: application/json" \
     -H "X-API-Key: $ANTHROPIC_API_KEY" \
     -H "anthropic-version: 2023-06-01" \
     -H "anthropic-beta: mcp-client-2025-11-20" \
     -d '{
       "model": "claude-opus-5",
       "max_tokens": 1000,
       "messages": [{"role": "user", "content": "What tools do you have available?"}],
       "mcp_servers": [
         {
           "type": "url",
           "url": "https://gantt.nare.li/api/mcp",
           "name": "gantt",
           "authorization_token": "YOUR_ACCESS_TOKEN"
         }
       ],
       "tools": [
         {
           "type": "mcp_toolset",
           "mcp_server_name": "gantt"
         }
       ]
     }'

mcp-remote must be 0.1.16 or newer (CVE-2025-6514) and needs Node 18+.

Official documentation ↗