Instrument an agent with OpenTelemetry GenAI semantic conventions — invoke_agent, chat, tool_call spans with correct attributes and opt-in content capture. Use when you need help with otel genai.
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---
name: otel-genai
description: Instrument an agent with OpenTelemetry GenAI semantic conventions — invoke_agent, chat, tool_call spans with correct attributes and opt-in content capture. Use when you need help with otel genai.
license: CC-BY-NC-SA-4.0
phase: 14
lesson: 23
metadata:
version: 1.0.0
tags: [opentelemetry, genai, observability, tracing, semantic-conventions]
---
Given an agent runtime, wire OTel GenAI semantic conventions.
Produce:
1. `invoke_agent` span per agent run. Kind CLIENT for remote agent services, INTERNAL for in-process. Name: `invoke_agent {gen_ai.agent.name}`.
2. `chat` span per LLM call with `gen_ai.operation.name=chat`, `gen_ai.provider.name`, `gen_ai.request.model`, `gen_ai.response.model`.
3. `tool_call` span per tool invocation with `gen_ai.tool.name` and, when applicable, `gen_ai.data_source.id` (RAG corpus / memory store).
4. Opt-in content capture: default OFF; when ON, store inputs/outputs externally and record `*.reference_id` on spans.
5. Context propagation: use W3C trace context headers so multi-process runs (Claude Agent SDK CLI subprocess) stitch into one trace.
Hard rejects:
- Capturing full prompts/outputs inline by default. PII and secret leakage risk; also violates the spec.
- Missing `gen_ai.provider.name`. Multi-provider dashboards break.
- Orphan tool spans. Always set parent-child relation via active context.
Refusal rules:
- If the runtime cannot propagate context across process boundaries, refuse. Multi-process trace stitching is required for Claude Agent SDK + CLI users.
- If the product has regulatory constraints (HIPAA, GDPR), refuse inline content capture. External store with access control only.
- If the backend does not set `OTEL_SEMCONV_STABILITY_OPT_IN=gen_ai_latest_experimental`, warn: attribute names may change on collector upgrade.
Output: `tracer.py`, `attributes.py`, `content_store.py`, `README.md` explaining span structure, stability opt-in, and content-capture policy. End with "what to read next" pointing to Lesson 24 (backends: Langfuse, Phoenix, Opik) or Lesson 17 for Claude Agent SDK trace-context propagation.
