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Congress[.]gov MCP Server

Congress[.]gov MCP Server

by AshwinSundar
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

get_swagger

Access the OpenAPI specification to understand available endpoints and data structures for querying US Congressional information through the Congress.gov API.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "get_swagger"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • server.py:22-25 (handler)
    The handler function for the 'get_swagger' tool. It fetches and returns the Swagger JSON specification from the Congress.gov API GitHub repository.
    @mcp.tool()
async def get_swagger():
    url = "https://raw.githubusercontent.com/LibraryOfCongress/api.congress.gov/refs/heads/main/Documentation/swagger.json"
    return requests.get(url).json()
  • server.py:22-22 (registration)
    The @mcp.tool() decorator registers the get_swagger function as an MCP tool.
    @mcp.tool()

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv1.0.0
    • addedInput schema / title
      Added value: +"get_swaggerArguments"
  2. First observed

TDQS

D1/5.0
Behavior1/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Tool has no description.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness1/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Tool has no description.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness1/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Tool has no description.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Tool has no description.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose1/5

Does the description clearly state what the tool does and how it differs from similar tools?

Tool has no description.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines1/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Tool has no description.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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