KosmoKrator

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Vega-Lite MCP Integration for Vercel AI SDK

Connect Vega-Lite to Vercel AI SDK through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

1 functions 0 read 1 write No credentials auth
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Connect Vega-Lite to Vercel AI SDK

Use KosmoKrator as a local integration gateway for Vercel AI SDK agents and scripts.

Create an MCP client that starts or connects to the KosmoKrator gateway for the selected integration. The gateway is local, scoped to this integration, and starts with --write=deny so Vercel AI SDK can inspect read-capable tools without receiving write access by default.

Vega-Lite MCP Config for Vercel AI SDK

Prefer CLI JSON calls when a workflow only needs one deterministic integration operation.

{
  "mcpServers": {
    "kosmokrator-vegalite": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=vegalite",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=vegalite --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Vega-Lite instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Vega-Lite Tools Visible to Vercel AI SDK

Vercel AI SDK sees stable MCP tool names generated from the Vega-Lite integration catalog.

MCP toolSource functionTypeDescription
integration__vegalite__render_vegalite vegalite.render_vegalite Write Render a Vega-Lite visualization to a PNG image. Pass a complete Vega-Lite JSON specification and get back a markdown image embed. IMPORTANT: Always use inline data with "data": {"values": [...]}. Never use "data": {"url": "..."}. Example spec: { "$schema": "https://vega.github.io/schema/vega-lite/v5.json", "data": {"values": [ {"category": "A", "value": 28}, {"category": "B", "value": 55}, {"category": "C", "value": 43} ]}, "mark": "bar", "encoding": { "x": {"field": "category", "type": "nominal"}, "y": {"field": "value", "type": "quantitative"} } } Supported mark types: bar, line, point, area, rect, circle, square, arc, text, tick, rule, trail, boxplot. Always include "type" in encoding channels: "quantitative", "nominal", "ordinal", or "temporal".

Related Vega-Lite Pages

Vega-Lite CLIUse direct JSON commands instead of MCP discovery. Vega-Lite MCPFull gateway reference and MCP tool names. KosmoKrator for Vercel AI SDKClient-level gateway setup.