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openclaw - 💡(How to fix) Fix [Bug] MCP diagram-generator tools not exposed [1 participants]

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openclaw/openclaw#68818•Fetched 2026-04-19 15:07:03
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Code Example

{
  "mcp": {
    "servers": {
      "mcp-diagram-generator": {
        "command": "npx",
        "args": ["-y", "mcp-diagram-generator"]
      }
    }
  }
}
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Bug Description

MCP diagram-generator tools are not appearing in available tools list despite correct configuration.

Steps to Reproduce

  1. Install diagram-generator skill from ClawHub
  2. Configure MCP server: openclaw mcp set mcp-diagram-generator '{"command":"npx","args":["-y","mcp-diagram-generator"]}'
  3. Restart Gateway: openclaw gateway restart
  4. Check available tools - no diagram-related tools found

Expected Behavior

MCP tools should be available:

  • mcp__mcp-diagram-generator__get_config
  • mcp__mcp-diagram-generator__generate_diagram
  • mcp__mcp-diagram-generator__init_config

Actual Behavior

Tools list does not contain any diagram-related MCP tools.

Environment

  • OpenClaw version: 2026.4.15
  • OS: Linux
  • Config (mcp section):
{
  "mcp": {
    "servers": {
      "mcp-diagram-generator": {
        "command": "npx",
        "args": ["-y", "mcp-diagram-generator"]
      }
    }
  }
}

Notes

  • The skill documentation is written for Claude Code/OpenCode (uses mcpServers format)
  • OpenClaw uses mcp.servers format, which is correctly configured
  • But tools are not exposed despite multiple Gateway restarts
  • This may be an OpenClaw MCP implementation issue

extent analysis

TL;DR

The issue might be resolved by verifying the compatibility of the mcp-diagram-generator skill with OpenClaw's MCP implementation and checking for any additional configuration requirements.

Guidance

  • Review the mcp-diagram-generator skill documentation to ensure it is compatible with OpenClaw's MCP implementation, considering the difference in configuration formats (mcpServers vs mcp.servers).
  • Verify that the mcp-diagram-generator command is correctly installed and executable via npx on the system.
  • Check the OpenClaw logs for any error messages related to the MCP server configuration or the mcp-diagram-generator skill.
  • Consider testing the mcp-diagram-generator skill with a different MCP server configuration to isolate the issue.

Example

No code snippet is provided as the issue seems to be related to configuration and compatibility rather than code.

Notes

The solution may depend on the specific implementation details of the mcp-diagram-generator skill and OpenClaw's MCP implementation, which are not fully provided in the issue description.

Recommendation

Apply workaround: Verify the compatibility of the mcp-diagram-generator skill with OpenClaw's MCP implementation and check for any additional configuration requirements, as the issue might be related to the difference in configuration formats or compatibility issues.

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