Legiscan MCP vs Source Library

In-depth architectural comparison of the Legiscan MCP and Source Library MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Legiscan MCP when:

• You need dedicated capabilities in the Research domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (Free / Open Source).
• You have access to required keys: LEGISCAN_API_KEY.
• Primary tools included: legiscan_find_legislator, legiscan_get_legislator_votes, legiscan_get_primary_authored.

Explore Legiscan MCP Details

Choose Source Library when:

• You need dedicated capabilities in the Research domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
• Primary tools included: OCR for historical texts using Gemini Vision, Context-aware translation across pages, Full-text and semantic search.

Feature & Specification Comparison

Specification	Legiscan MCP sh-patterson Research	Source Library Research
Summary	Access legislative data from all 50 US states and Congress — search bills, get full text, track votes, and look up legislators via the LegiScan API.	Search rare historical texts with OCR, translations & DOI citations.
Category & Scope	Research

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "sh-patterson-legiscan-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "legiscan-mcp-server"
      ],
      "env": {
        "LEGISCAN_API_KEY": "YOUR_LEGISCAN_API_KEY_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "source-library": {
      "command": "npx",
      "args": [
        "-y",
        "source-library"
      ]
    }
  }
}

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