Validate MCP Envelope

Validate a JSON-RPC 2.0 MCP tools/call envelope without calling a remote MCP server.

Instantiate locally
mcp-envelope.json
{
  "jsonrpc": "2.0",
  "id": "sandbox-envelope",
  "method": "tools/call",
  "params": {
    "name": "get_sandbox_status",
    "arguments": {}
  }
}
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