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Display live tool call activity in AI response chat bubble #542

Description

@haiphucnguyen

Summary

When the AI executes tools (MCP/function calls) during a response, the user sees no feedback — only the "Thinking..." spinner. We should surface live tool call activity so users understand what the AI is doing, especially for multi-step agentic workflows.


Current Behavior

  • onToolExecuted callback in sendStreamingMessageWithCallback (ChatClientExtensions) only logs to debug
  • No tool call information is forwarded to the UI layer
  • Users see only the spinner with elapsed seconds while tools are running

Desired Behavior

During streaming, show a live feed of tool calls above or alongside the thinking indicator:
⠹ Thinking (4s) 🔧 search_files — ✓ 🔧 read_file — ✓ 🔧 run_terminal — running...

After completion, the tool call summary collapses into a small expandable chip on the AI message bubble.

Notes

  • Tool arguments can be long - truncate or hide by default in the live view
  • Tool results can also be large - only show them in the expanded collapsed chip, not the live feed
  • The feature is purely presentational; no persistence of tool call data is required

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