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harness
string
session_id
string
prompt
string
messages
list
tools
list
metadata
unknown
sent_at
string
num_user_messages
int64
num_tool_calls
int64
trace
unknown
file_path
string
pi
abc123
what time is it?
[ { "role": "user", "content": "what time is it?" }, { "role": "tool", "content": "2026-07-01T15:00:00Z" }, { "role": "assistant", "content": "it is 15:00 UTC" } ]
[]
{ "source_file": "what-time-is-it.jsonl", "session_id": "abc123", "trace_type": "pi", "model_provider": null, "model": null, "cwd": null, "cli_version": null, "turn_count": 1 }
null
1
0
"{\"type\":\"session\",\"harness\":\"my-agent\",\"id\":\"abc123\",\"name\":\"what time is it\"}\n{\"type\":\"message\",\"message\":{\"role\":\"user\",\"content\":\"what time is it?\"}}\n{\"type\":\"message\",\"message\":{\"role\":\"assistant\",\"content\":\"\",\"toolCalls\":[{\"id\":\"t1\",\"function\":{\"name\":\"get_...
what-time-is-it.jsonl

HF STS doc example (verbatim control)

Exact JSONL from https://huggingface.co/docs/hub/session-traces-format

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