MCP Server

MCP Server

rvrb-verify exposes an MCP (Model Context Protocol) server for integration with AI agents.

Installation

pip install "rvrb-verify[mcp]"

Tool definition

The MCP server exposes a single tool:

verify

Verify a claim using the specified strategy.

Parameters:

Parameter	Type	Required	Description
claim_text	str	Yes	The claim to verify
strategy	str	No	Strategy name (default: "fact-check")

Returns: dict — Verdict as JSON-serializable dictionary.

Usage

Start the server

rvrb-verify-mcp

The server runs on stdio transport, compatible with any MCP client.

Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "verify": {
      "command": "rvrb-verify-mcp",
      "env": {
        "DASHSCOPE_API_KEY": "sk-..."
      }
    }
  }
}

Continue.dev

Add to your Continue config (~/.continue/config.json):

{
  "mcpServers": [
    {
      "name": "verify",
      "command": "rvrb-verify-mcp",
      "env": {
        "DASHSCOPE_API_KEY": "sk-..."
      }
    }
  ]
}

Programmatic usage

from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client

server_params = StdioServerParameters(
    command="rvrb-verify-mcp",
    env={"DASHSCOPE_API_KEY": "sk-..."}
)

async with stdio_client(server_params) as (read, write):
    async with ClientSession(read, write) as session:
        await session.initialize()
        
        # Call the verify tool
        result = await session.call_tool(
            "verify",
            arguments={
                "claim_text": "The sky is blue",
                "strategy": "fact-check"
            }
        )
        
        print(result.content)

JSON-RPC example

The MCP server uses JSON-RPC 2.0 over stdio:

// Request
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "verify",
    "arguments": {
      "claim_text": "The sky is blue",
      "strategy": "fact-check"
    }
  }
}

// Response
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [
      {
        "type": "text",
        "text": "{\"verdict\": \"true\", \"confidence\": 0.95, ...}"
      }
    ]
  }
}

Environment variables

Variable	Description
DASHSCOPE_API_KEY	Required for Qwen provider
OPENAI_API_KEY	Required for OpenAI provider
N3RVERBERAGE_PROVIDER	Default provider
N3RVERBERAGE_DEFAULT_MODEL	Default model ID

Error handling

MCP tool calls return errors in the standard MCP format:

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32000,
    "message": "Unknown strategy: invalid"
  }
}

Integration with other satellites

Combine with other reverberage satellites in an MCP pipeline:

{
  "mcpServers": {
    "transcriber": {
      "command": "rvrb-transcriber-mcp"
    },
    "verify": {
      "command": "rvrb-verify-mcp"
    },
    "transform": {
      "command": "rvrb-transform-mcp"
    }
  }
}

Example workflow:

1. Transcribe audio with transcriber tool
2. Extract claims from transcript
3. Verify each claim with verify tool
4. Format results with transform tool