feat(core): publish tool.result on the bus for the activity panel

src/beaver_gateway/core/conversations.py

@@ -29,7 +29,9 @@ from claude_agent_sdk import (
     AssistantMessage,
     ResultMessage,
     StreamEvent,
+    ToolResultBlock,
     ToolUseBlock,
+    UserMessage,
     fork_session_via_store,
     project_key_for_directory,
 )
@@ -963,6 +965,20 @@ class Conversations:
                             name=block.name,
                             input=block.input,
                         )
+            elif isinstance(message, UserMessage):
+                blocks = message.content if isinstance(message.content, list) else ()
+                for block in blocks:
+                    if isinstance(block, ToolResultBlock):
+                        self._bus.publish(
+                            "tool.result",
+                            conversation_id=conversation_id,
+                            turn_id=turn_id,
+                            origin=origin,
+                            parent_tool_use_id=parent,
+                            tool_use_id=block.tool_use_id,
+                            is_error=bool(block.is_error),
+                            content=_result_preview(block.content),
+                        )
             elif isinstance(message, ResultMessage) and parent is None:
                 self._bus.publish(
                     "result",
@@ -1055,6 +1071,24 @@ def _iso(value: datetime | None) -> str | None:
     return _aware(value).isoformat(timespec="seconds") if value is not None else None
 
 
+def _result_preview(
+    content: str | list[dict[str, Any]] | None, limit: int = 400
+) -> str:
+    """Short text of a tool result for the panel: the transcript keeps the whole."""
+    if content is None:
+        return ""
+    text = (
+        content
+        if isinstance(content, str)
+        else "\n".join(
+            str(part.get("text", ""))
+            for part in content
+            if isinstance(part, dict) and part.get("type") == "text"
+        )
+    )
+    return text if len(text) <= limit else text[:limit] + "…"
+
+
 def _usage_dict(capture: TurnCapture) -> dict[str, Any] | None:
     usage = capture.usage
     if usage is None:

tests/test_conversations.py

@@ -12,6 +12,9 @@ from claude_agent_sdk import (
     ResultMessage,
     StreamEvent,
     TextBlock,
+    ToolResultBlock,
+    ToolUseBlock,
+    UserMessage,
     project_key_for_directory,
 )
 
@@ -655,3 +658,40 @@ def test_agent_kinds_follow_prompts(tmp_path: Path) -> None:
             kinds=("master", "deep"),
             prompts=Prompts(master=()),
         )
+
+
+async def test_observer_publishes_tool_results_for_the_panel(world: World) -> None:
+    seen: list[dict[str, Any]] = []
+
+    async def collect() -> None:
+        async for event in world.bus.stream(conversation_id="c1"):
+            seen.append(event)
+
+    task = asyncio.create_task(collect())
+    await asyncio.sleep(0)
+    observe = world.conversations._observer("c1", "t1", "user")
+    observe(
+        AssistantMessage(
+            content=[ToolUseBlock(id="toolu_1", name="Bash", input={"command": "ls"})],
+            model="m",
+            parent_tool_use_id="toolu_0",
+        )
+    )
+    observe(
+        UserMessage(
+            content=[
+                ToolResultBlock(tool_use_id="toolu_1", content="a\nb", is_error=False)
+            ],
+            parent_tool_use_id="toolu_0",
+        )
+    )
+    observe(UserMessage(content="plain text, no tool result"))
+    await asyncio.sleep(0.05)
+    task.cancel()
+    assert [e["type"] for e in seen] == ["tool", "tool.result"]
+    tool, result = seen
+    assert tool["tool_use_id"] == "toolu_1" and tool["parent_tool_use_id"] == "toolu_0"
+    assert result["tool_use_id"] == "toolu_1"
+    assert result["parent_tool_use_id"] == "toolu_0"
+    assert result["turn_id"] == "t1" and result["is_error"] is False
+    assert result["content"] == "a\nb"