scripts/format_sft.py

#!/usr/bin/env python3
"""Convert structured records into a conservative chat-style SFT view."""

from __future__ import annotations

import argparse
import json
from pathlib import Path
from typing import Any


SYSTEM = (
    "You are a repository-grounded coding agent. Inspect evidence before editing, keep changes "
    "inside scope, use tools with valid arguments, verify before claiming success, and report "
    "unexecuted checks as unverified."
)


def assistant_target(record: dict[str, Any]) -> dict[str, Any]:
    supervision = record["supervision"]
    if record["record_type"] == "trajectory":
        return {
            "policy_summary": supervision["policy_summary"],
            "actions": [step["action"] for step in supervision["steps"]],
            "final_response_contract": supervision["final_response_contract"],
        }
    if record["record_type"] == "preference":
        return {
            "chosen_sequence": supervision["chosen_sequence"],
            "preference_reason": supervision["preference_reason"],
        }
    return {
        "diagnosis": supervision["diagnosis"],
        "repair_sequence": supervision["repair_sequence"],
        "success_criteria": supervision["success_criteria"],
    }


def convert(record: dict[str, Any]) -> dict[str, Any]:
    user_payload = {
        "task": record["task"],
        "environment": record["environment"],
        "behavioral_contract": record["behavioral_labels"]["target_behavior"],
    }
    return {
        "id": record["id"],
        "messages": [
            {"role": "system", "content": SYSTEM},
            {"role": "user", "content": json.dumps(user_payload, ensure_ascii=False)},
            {"role": "assistant", "content": json.dumps(assistant_target(record), ensure_ascii=False)},
        ],
        "metadata": {
            "record_type": record["record_type"],
            "primary_behavior": record["primary_behavior"],
            "language": record["language"],
            "execution_verified": record["provenance"]["execution_verified"],
        },
    }


def main() -> None:
    parser = argparse.ArgumentParser()
    parser.add_argument("input", type=Path)
    parser.add_argument("output", type=Path)
    args = parser.parse_args()
    with args.input.open("r", encoding="utf-8") as source, args.output.open("w", encoding="utf-8") as target:
        for line in source:
            if line.strip():
                target.write(json.dumps(convert(json.loads(line)), ensure_ascii=False) + "\n")


if __name__ == "__main__":
    main()