tool_call session update doesn't contain the actual tool call input args

[wKich]

According to documentation the tool call notification message has this structure:

{
  "jsonrpc": "2.0",
  "method": "session/update",
  "params": {
    "sessionId": "sess_abc123def456",
    "update": {
      "sessionUpdate": "tool_call",
      "toolCallId": "call_001",
      "title": "Reading configuration file",
      "kind": "read",
      "status": "pending"
    }
  }
}

But it doesn't contain the input arguments which model is used for calling a tool. The biggest downside of this the Client can't know which file is read, it only gets file content, which leads to poor UX.

Maybe I didn't find the way how the Client can get tool call arguments.

[agentcooper]

For file system it is better to use fs/read_text_file and fs/write_text_file (https://agentclientprotocol.com/protocol/file-system). For tool calls you can provide rawInput parameter.