Problem

When using Minimax model, text that appears before tool calls in a single API response is not being sent to the chat (e.g., WhatsApp). Only the tool block is shown.

Example

User: Check the time

Assistant: "Sure, let me check that." <-- NOT visible in WhatsApp
Assistant: [Tool: exec] <-- visible (tool block)
Assistant: "Done – it is 00:33..." <-- visible

Expected: All three parts should appear as separate messages in the chat.

Session Log Excerpt

The text IS visible in the session history/Dashboard UI:

{
  "role": "assistant",
  "content": [
    {
      "type": "text",
      "text": "Sure, let me check that."
    },
    {
      "type": "toolCall",
      "id": "call_function_xxx_1",
      "name": "exec",
      "arguments": {
        "command": "date"
      }
    }
  ],
  "api": "anthropic-messages",
  "provider": "minimax",
  "model": "MiniMax-M2.1",
  "stopReason": "toolUse"
}

The Dashboard UI shows the text, but WhatsApp only receives the tool block.

Root Cause

The issue is that Minimax sends text + tool_call in a single API response. OpenClaw's reply pipeline only extracts the tool block, discarding the preceding text.

Compared to Claude/Sonnet which emit text before tools as separate events (e.g., text_delta, text_end before tool_execution_start), Minimax appears to bundle them together.

Observed Behavior

• Text BEFORE tool calls: NOT sent to chat (visible in Dashboard only)
• Tool results: Sent to chat
• Text AFTER tool calls: Sent to chat

Location

The issue is in the Minimax provider integration, not in the general reply pipeline. The text never arrives as a separate event before tool_execution_start.

Environment

• OpenClaw latest
• Minimax model
• WhatsApp channel