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Add input token count to agent.tool.responseLength telemetry event #1197

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Add input token count to agent.tool.responseLength telemetry event #1197

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Copilot Sep 30, 2025
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Add input token count to agent.tool.responseLength telemetry event
Copilot Sep 30, 2025
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5 changes: 3 additions & 2 deletions src/extension/prompts/node/panel/chatVariables.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -359,8 +359,9 @@ export class ChatToolReferences extends PromptElement<ChatToolCallProps, void> {

const name = toolReference.range ? this.props.promptContext.query.slice(toolReference.range[0], toolReference.range[1]) : undefined;
try {
const result = await this.toolsService.invokeTool(tool.name, { input: { ...toolArgs, ...internalToolArgs }, toolInvocationToken: tools.toolInvocationToken }, CancellationToken.None);
sendInvokedToolTelemetry(this.promptEndpoint.acquireTokenizer(), this.telemetryService, tool.name, result);
const input = { ...toolArgs, ...internalToolArgs };
const result = await this.toolsService.invokeTool(tool.name, { input, toolInvocationToken: tools.toolInvocationToken }, CancellationToken.None);
sendInvokedToolTelemetry(this.promptEndpoint.acquireTokenizer(), this.telemetryService, tool.name, JSON.stringify(input), result);
results.push({ name, value: result });
} catch (err) {
const errResult = toolCallErrorToResult(err);
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32 changes: 18 additions & 14 deletions src/extension/prompts/node/panel/toolCalling.tsx
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Expand Up @@ -224,7 +224,7 @@ class ToolResultElement extends PromptElement<ToolResultElementProps, void> {
}

toolResult = await this.toolsService.invokeTool(this.props.toolCall.name, invocationOptions, CancellationToken.None);
sendInvokedToolTelemetry(this.promptEndpoint.acquireTokenizer(), this.telemetryService, this.props.toolCall.name, toolResult);
sendInvokedToolTelemetry(this.promptEndpoint.acquireTokenizer(), this.telemetryService, this.props.toolCall.name, this.props.toolCall.arguments, toolResult);
} catch (err) {
const errResult = toolCallErrorToResult(err);
toolResult = errResult.result;
Expand Down Expand Up @@ -287,26 +287,30 @@ class ToolResultElement extends PromptElement<ToolResultElementProps, void> {
}
}

export function sendInvokedToolTelemetry(tokenizer: ITokenizer, telemetry: ITelemetryService, toolName: string, toolResult: LanguageModelToolResult2) {
new BasePromptRenderer(
{ modelMaxPromptTokens: Infinity },
class extends PromptElement {
render() {
return <UserMessage><PrimitiveToolResult content={toolResult.content} /></UserMessage>;
}
},
{},
tokenizer,
).render().then(({ tokenCount }) => {
export function sendInvokedToolTelemetry(tokenizer: ITokenizer, telemetry: ITelemetryService, toolName: string, toolInput: string, toolResult: LanguageModelToolResult2) {
Promise.all([
new BasePromptRenderer(
{ modelMaxPromptTokens: Infinity },
class extends PromptElement {
render() {
return <UserMessage><PrimitiveToolResult content={toolResult.content} /></UserMessage>;
}
},
{},
tokenizer,
).render(),
tokenizer.tokenLength(toolInput)
]).then(([{ tokenCount: responseTokenCount }, inputTokenCount]) => {
/* __GDPR__
"agent.tool.responseLength" : {
"owner": "connor4312",
"comment": "Counts the number of tokens generated by tools",
"toolName": { "classification": "SystemMetaData", "purpose": "FeatureInsight", "comment": "The name of the tool being invoked." },
"tokenCount": { "classification": "SystemMetaData", "purpose": "PerformanceAndHealth", "comment": "Number of tokens used.", "isMeasurement": true }
"tokenCount": { "classification": "SystemMetaData", "purpose": "PerformanceAndHealth", "comment": "Number of tokens in the tool response.", "isMeasurement": true },
"inputTokenCount": { "classification": "SystemMetaData", "purpose": "PerformanceAndHealth", "comment": "Number of tokens in the tool input.", "isMeasurement": true }
}
*/
telemetry.sendMSFTTelemetryEvent('agent.tool.responseLength', { toolName }, { tokenCount });
telemetry.sendMSFTTelemetryEvent('agent.tool.responseLength', { toolName }, { tokenCount: responseTokenCount, inputTokenCount });
});
}

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