Fetch the full execution detail for a single trace — tool executions, events timeline, LLM call spans (with error_message on failures).
Use after `agents.traces_list` identifies a specific trace of interest (failed run, slow run, unexpected outcome).
By default LLM `system_prompt` and `prompt_messages` are stripped — set `include_llm_bodies=true` to fetch them when diagnosing prompt engineering issues (emits a WARNING audit log). Set `full=true` to disable all field truncation. `completion_text` on failed LLM calls is always returned (capped at 8 KB).
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