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feat: report tool call result at the end of a tool call #496

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Merged
merged 1 commit into from
Oct 8, 2025
Merged

feat: report tool call result at the end of a tool call #496

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50 changes: 30 additions & 20 deletions typescript-sdk/integrations/langgraph/python/ag_ui_langgraph/agent.py
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@
ToolCallArgsEvent,
ToolCallEndEvent,
ToolCallStartEvent,
ToolCallResultEvent,
ThinkingTextMessageStartEvent,
ThinkingTextMessageContentEvent,
ThinkingTextMessageEndEvent,
Expand Down Expand Up @@ -674,31 +675,40 @@ async def _handle_single_event(self, event: Any, state: State) -> AsyncGenerator
)

elif event_type == LangGraphEventTypes.OnToolEnd:
if self.active_run["has_function_streaming"]:
return
tool_call_output = event["data"]["output"]
yield self._dispatch_event(
ToolCallStartEvent(
type=EventType.TOOL_CALL_START,
tool_call_id=tool_call_output.tool_call_id,
tool_call_name=tool_call_output.name,
parent_message_id=tool_call_output.id,
raw_event=event,
if not self.active_run["has_function_streaming"]:
yield self._dispatch_event(
ToolCallStartEvent(
type=EventType.TOOL_CALL_START,
tool_call_id=tool_call_output.tool_call_id,
tool_call_name=tool_call_output.name,
parent_message_id=tool_call_output.id,
raw_event=event,
)
)
)
yield self._dispatch_event(
ToolCallArgsEvent(
type=EventType.TOOL_CALL_ARGS,
tool_call_id=tool_call_output.tool_call_id,
delta=json.dumps(event["data"]["input"]),
raw_event=event
yield self._dispatch_event(
ToolCallArgsEvent(
type=EventType.TOOL_CALL_ARGS,
tool_call_id=tool_call_output.tool_call_id,
delta=json.dumps(event["data"]["input"]),
raw_event=event
)
)
)
yield self._dispatch_event(
ToolCallEndEvent(
type=EventType.TOOL_CALL_END,
tool_call_id=tool_call_output.tool_call_id,
raw_event=event
)
)

yield self._dispatch_event(
ToolCallEndEvent(
type=EventType.TOOL_CALL_END,
ToolCallResultEvent(
type=EventType.TOOL_CALL_RESULT,
tool_call_id=tool_call_output.tool_call_id,
raw_event=event
message_id=uuid.uuid4(),
content=tool_call_output.content,
role="tool"
)
)

Expand Down
46 changes: 28 additions & 18 deletions typescript-sdk/integrations/langgraph/src/agent.ts
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -48,12 +48,12 @@ import {
ToolCallArgsEvent,
ToolCallEndEvent,
ToolCallStartEvent,
ToolCallResultEvent,
ThinkingTextMessageStartEvent,
ThinkingTextMessageContentEvent,
ThinkingTextMessageEndEvent,
ThinkingStartEvent,
ThinkingEndEvent,
Message as AGUIMessage,
} from "@ag-ui/client";
import { RunsStreamPayload } from "@langchain/langgraph-sdk/dist/types";
import {
Expand All @@ -76,6 +76,7 @@ export type ProcessedEvents =
| ToolCallStartEvent
| ToolCallArgsEvent
| ToolCallEndEvent
| ToolCallResultEvent
| ThinkingStartEvent
| ThinkingEndEvent
| StateSnapshotEvent
Expand Down Expand Up @@ -774,26 +775,35 @@ export class LangGraphAgent extends AbstractAgent {
});
break;
case LangGraphEventTypes.OnToolEnd:
if (this.activeRun!.hasFunctionStreaming) break;
const toolCallOutput = event.data.output
const toolCallOutput = event.data?.output
if (!this.activeRun!.hasFunctionStreaming) {
this.dispatchEvent({
type: EventType.TOOL_CALL_START,
toolCallId: toolCallOutput.tool_call_id,
toolCallName: toolCallOutput.name,
parentMessageId: toolCallOutput.id,
rawEvent: event,
})
this.dispatchEvent({
type: EventType.TOOL_CALL_ARGS,
toolCallId: toolCallOutput.tool_call_id,
delta: JSON.stringify(event.data.input),
rawEvent: event,
});
this.dispatchEvent({
type: EventType.TOOL_CALL_END,
toolCallId: toolCallOutput.tool_call_id,
rawEvent: event,
});
}
this.dispatchEvent({
type: EventType.TOOL_CALL_START,
type: EventType.TOOL_CALL_RESULT,
toolCallId: toolCallOutput.tool_call_id,
toolCallName: toolCallOutput.name,
parentMessageId: toolCallOutput.id,
rawEvent: event,
content: toolCallOutput?.content,
messageId: randomUUID(),
role: "tool",
})
this.dispatchEvent({
type: EventType.TOOL_CALL_ARGS,
toolCallId: toolCallOutput.tool_call_id,
delta: JSON.stringify(event.data.input),
rawEvent: event,
});
this.dispatchEvent({
type: EventType.TOOL_CALL_END,
toolCallId: toolCallOutput.tool_call_id,
rawEvent: event,
});
break;
}
}

Expand Down
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