import json
import sys

PROTOCOL = "mnemosyne-external-strategy/v1"

def main():
    request = json.loads(sys.stdin.readline())
    if request.get("protocol_version") != PROTOCOL:
        raise ValueError("unsupported protocol")
    observations = request.get("observations", [])
    current = observations[-1]["content"] if observations else None
    result = {
        "protocol_version": PROTOCOL,
        "run_id": request["run_id"],
        "strategy_id": "example_python",
        "scenario_id": request["scenario_id"],
        "current_answer": current,
        "historical_answer": None,
        "abstained": not bool(observations),
        "confidence": 0.5 if observations else 0.0,
        "recalled_records": [o["observation_id"] for o in observations[-4:]],
        "selected_context": [o["content"] for o in observations[-4:]],
        "lifecycle_actions": [],
        "promotion_actions": [],
        "evidence_families_counted": sorted({o["evidence_family_id"] for o in observations[-4:]}),
        "active_memory_ids": [],
        "superseded_memory_ids": [],
        "explanation": "Selected the most recent bounded observations; no evaluator labels were used.",
        "warnings": ["demonstration adapter; not a production memory strategy"],
    }
    sys.stdout.write(json.dumps(result, sort_keys=True) + "\n")

if __name__ == "__main__":
    main()