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Mermaid MCP Integration for LangGraph
Connect Mermaid to LangGraph through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.
Connect Mermaid to LangGraph
Run KosmoKrator integration calls from LangGraph nodes while preserving local credentials and permissions.
Use a graph node that calls the KosmoKrator CLI for deterministic steps or an MCP client for dynamic tool selection. The gateway is local, scoped to this integration, and starts with
--write=deny so LangGraph can inspect read-capable tools without receiving write access by default.
Mermaid MCP Config for LangGraph
Headless CLI calls fit repeatable graph edges; MCP fits exploratory agent nodes.
{
"mcpServers": {
"kosmokrator-mermaid": {
"type": "stdio",
"command": "kosmo",
"args": [
"mcp:serve",
"--integration=mermaid",
"--write=deny"
]
}
}
}Run the Gateway Manually
kosmokrator mcp:serve --integration=mermaid --write=denyWhy Use KosmoKrator Here
Expose only Mermaid instead of a broad multi-service tool list.
Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.
Start read-only, then opt into ask or allow for trusted workspaces.
Mermaid Tools Visible to LangGraph
LangGraph sees stable MCP tool names generated from the Mermaid integration catalog.
| MCP tool | Source function | Type | Description |
|---|---|---|---|
integration__mermaid__render_mermaid | mermaid.render_mermaid | Write | Render a Mermaid diagram to a PNG image. Pass valid Mermaid syntax and get back a markdown image embed. Supported diagram types: flowchart, sequence, class, state, ER, Gantt, pie, quadrant, requirement, git graph, C4, mindmap, timeline, sankey, XY chart, block. Example syntax: ``` graph TD A[Start] --> B{Decision} B -->|Yes| C[Action] B -->|No| D[End] ``` Tips: - Use `graph TD` for top-down flowcharts, `graph LR` for left-to-right - Use `sequenceDiagram` for sequence diagrams - Use `erDiagram` for entity-relationship diagrams - Use `classDiagram` for class diagrams - Use `stateDiagram-v2` for state diagrams - Use `gantt` for Gantt charts - Use `pie` for pie charts - Use `gitgraph` for git graphs - Use `mindmap` for mind maps |