Cryo MCP Server

Instructions

Implementation Reference

• cryo_mcp/server.py:54-79 (handler)

  The list_datasets tool handler: runs 'cryo help datasets' subprocess, parses output to return list of available Cryo datasets. Registered via @mcp.tool() decorator.

  @mcp.tool()
  def list_datasets() -> List[str]:
      """Return a list of all available cryo datasets"""
      # Ensure we have the RPC URL
      rpc_url = os.environ.get("ETH_RPC_URL", DEFAULT_RPC_URL)
      
      result = subprocess.run(
          ["cryo", "help", "datasets", "-r", rpc_url],
          capture_output=True,
          text=True
      )
  
      # Parse the output to extract dataset names
      lines = result.stdout.split('\n')
      datasets = []
  
      for line in lines:
          if line.startswith('- ') and not line.startswith('- blocks_and_transactions:'):
              # Extract dataset name, removing any aliases
              dataset = line[2:].split(' (alias')[0].strip()
              datasets.append(dataset)
          if line == 'dataset group names':
              break
  
      return datasets