Add OTel tracing for Claude agent sessions#310878
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Pull request overview
Adds OpenTelemetry (OTel) tracing enhancements to Claude agent sessions in the Copilot extension, aligning emitted spans/attributes with GenAI semantic conventions and extending cache token usage reporting across agent types.
Changes:
- Extend usage schemas + span attributes to include cache creation token breakdown (
gen_ai.usage.cache_creation.input_tokens) alongside cache read tokens. - Add Claude session OTel context propagation so
chatspans from the CAPI proxy are parented under the per-requestinvoke_agent clauderoot span (and support subagent nesting). - Document Claude agent tracing behavior and cache usage attributes in
agent_monitoring.md.
Show a summary per file
| File | Description |
|---|---|
| extensions/copilot/src/platform/networking/common/openai.ts | Extends APIUsage.prompt_tokens_details to include cache_creation_input_tokens. |
| extensions/copilot/src/platform/endpoint/node/messagesApi.ts | Populates cache_creation_input_tokens in Anthropic Messages API usage output. |
| extensions/copilot/src/extension/prompt/node/chatMLFetcher.ts | Emits cache creation token usage on chat spans when present. |
| extensions/copilot/src/extension/intents/node/toolCallingLoop.ts | Rolls up cache read/creation token counts onto invoke_agent spans for the foreground agent loop. |
| extensions/copilot/src/extension/chatSessions/claude/common/claudeSessionStateService.ts | Adds per-session stored TraceContext getter/setter to support span parenting. |
| extensions/copilot/src/extension/chatSessions/claude/node/claudeSessionStateService.ts | Implements trace-context persistence in Claude session state. |
| extensions/copilot/src/extension/chatSessions/claude/node/claudeLanguageModelServer.ts | Wraps proxy requests in stored trace context so chat spans parent to invoke_agent. |
| extensions/copilot/src/extension/chatSessions/claude/node/claudeCodeAgent.ts | Introduces invoke_agent claude root span per request, token rollups, subagent context switching, and OTel env forwarding to subprocess. |
| extensions/copilot/src/extension/chatSessions/claude/common/claudeMessageDispatch.ts | Parents execute_tool spans correctly under root/subagent contexts; renames hook span naming/attributes. |
| extensions/copilot/src/extension/chatSessions/claude/common/test/claudeMessageDispatch.spec.ts | Updates test state shape for new subagent trace context tracking. |
| extensions/copilot/docs/monitoring/agent_monitoring.md | Documents cache token attributes and Claude agent tracing/span hierarchy. |
Copilot's findings
- Files reviewed: 11/11 changed files
- Comments generated: 5
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…r gen_ai.usage consistency
…gent tracing and usage metrics
…moving beta tracing and content capture variables
…larity feat(tracing): rename hook_name attribute to hook_command for better context fix(agent): clear subagent trace contexts after request completion
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TylerLeonhardt
approved these changes
Apr 27, 2026
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Add OpenTelemetry tracing for Claude agent sessions with full GenAI semantic convention compliance.
invoke_agent clauderoot span with token usage, cache breakdown, cost, and turn countchatspans parented under invoke_agent via trace context propagation through CAPI proxyexecute_toolandexecute_hookspans with subagent nesting underexecute_tool Agentcache_read,cache_creation) on both root and per-chat spans for all agent typesagent_monitoring.md