Add detailed token usage#319264
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Pull request overview
This PR enhances the Copilot request log tree UI by showing more detailed token usage metrics (total, input, cached, output) for chat request entries, improving observability of per-request and per-prompt token costs.
Changes:
- Add helpers to compute total tokens and format a token breakdown string for tooltips.
- Update
ChatRequestItemto display total tokens in the description and include a detailed breakdown in the tooltip. - Add a per-prompt aggregated token summary on
ChatPromptItem(computed from child successful ChatML requests).
Show a summary per file
| File | Description |
|---|---|
| extensions/copilot/src/extension/log/vscode-node/requestLogTree.ts | Adds token usage aggregation/formatting and surfaces it in request log tree item descriptions/tooltips. |
Copilot's findings
- Files reviewed: 1/1 changed files
- Comments generated: 2
Comment on lines
31
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| /** | ||
| * Serialize MCP server definitions to a JSON-safe format. | ||
| * Excludes sensitive headers like Authorization. | ||
| */ | ||
| function tokenTotal(usage: APIUsage): number { | ||
| return usage.total_tokens ?? (usage.prompt_tokens + usage.completion_tokens); | ||
| } | ||
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| function formatTokenBreakdown(usage: APIUsage): string { | ||
| const fmt = (n: number) => n.toLocaleString('en-US'); | ||
| const cached = usage.prompt_tokens_details?.cached_tokens ?? 0; | ||
| const input = Math.max(0, usage.prompt_tokens - cached); | ||
| return `input: ${fmt(input)}, cached: ${fmt(cached)}, output: ${fmt(usage.completion_tokens)}`; | ||
| } | ||
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| function serializeMcpServers(servers: readonly vscode.McpServerDefinition[]): object[] { |
dmitrivMS
approved these changes
Jun 1, 2026
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Enhance the display of token usage in the chat interface by calculating and formatting total, input, cached, and output tokens. This update improves the visibility of token metrics for each chat request item.