codex-tool-use-trajectories

"""Stage 1: stream one rollout file, split it into turns, keep what later stages need.
Everything is read line by line (never the whole file). Every line is JSON-parsed so that the
malformed / scalar counts are exact. Raw content is only *parsed*, never executed or followed.
"""
import json
import os
import re
from collections import Counter

DROP_RESPONSE_ITEMS = ("reasoning", "web_search_call", "tool_search_call", "tool_search_output")

_CTX_PREFIXES = (
    ("# AGENTS.md instructions", "agents_md"),
    ("<environment_context>", "environment_context"),
    ("<turn_aborted>", "turn_aborted_note"),
    ("<subagent_notification>", "subagent_notification"),
    ("<permissions instructions>", "permissions"),
    ("<model_switch>", "model_switch"),
    ("<collaboration_mode>", "collaboration_mode"),
    ("<skill>", "skill"),
    ("<user_shell_command>", "user_shell_command"),
    ("<INSTRUCTIONS>", "instructions"),
)


def classify_injected(role, text):
    t = (text or "").lstrip()[:60]
    for pre, name in _CTX_PREFIXES:
        if t.startswith(pre):
            return f"{role}:{name}"
    if role == "user":
        return "user:copy_or_other"
    return f"{role}:other"


def message_text(content):
    """Join the text parts of a response_item message content list."""
    if isinstance(content, str):
        return content
    parts = []
    if isinstance(content, list):
        for c in content:
            if isinstance(c, dict):
                tx = c.get("text")
                if isinstance(tx, str):
                    parts.append(tx)
    return "\n".join(parts) if len(parts) != 1 else parts[0]


def uuid7_ms(u):
    """Milliseconds embedded in a UUIDv7 string, or None."""
    try:
        h = u.replace("-", "")
        if len(h) == 32 and h[12] == "7":
            return int(h[:12], 16)
    except Exception:
        pass
    return None


def new_instance(turn_id, ts, started_at, lineno, goal):
    return {
        "turn_id": turn_id, "ts": ts, "started_at": started_at, "line": lineno,
        "ctx": None, "events": [], "call_ids": set(), "complete": False, "last_msg": None,
        "aborted": False, "n_compact": 0, "goal": goal, "goal_in_turn": None, "drop": Counter(),
        "n_user_events": 0, "user_images": 0, "dup_calls": 0,
    }


def scan_file(args):
    path, rel = args
    st = Counter()
    size = os.path.getsize(path)
    file_session = None
    sm_count = 0
    sm_ids = Counter()
    instances = []
    cur = None
    last_by_tid = {}
    last_goal = None
    orphan_calls = 0
    orphan_buf = []        # events seen before any task_started (head of the file destroyed): kept for manual recovery
    orphan_events = Counter()
    orphan_turns = []   # task_complete seen for a turn whose start was lost
    ctx_models = Counter()

    if size == 0:
        st["empty_file"] += 1
        return {"rel": rel, "size": size, "stats": st, "session": None, "sm_count": 0, "foreign_sm": 0, "instances": [],
                "orphan_turns": [], "orphan_events": orphan_events, "pairs": []}

    def open_cur():
        return cur is not None and not cur["complete"]

    with open(path, encoding="utf-8-sig", errors="replace", newline="\n") as f:
        for lineno, line in enumerate(f):
            st["lines"] += 1
            s = line.strip()
            if not s:
                st["blank_lines"] += 1
                continue
            try:
                rec = json.loads(s)
            except (ValueError, RecursionError):
                st["malformed_lines"] += 1
                if "\x00" in s:
                    st["malformed:contains_NUL_bytes"] += 1
                elif "\ufffd" in s:
                    st["malformed:contains_U+FFFD_(undecodable_bytes)"] += 1
                elif s[:1] in "{[":
                    st["malformed:truncated_json"] += 1
                else:
                    st["malformed:non_json_text_fragment"] += 1
                continue
            if not isinstance(rec, dict):
                st["scalar_lines"] += 1
                continue
            t = rec.get("type")
            p = rec.get("payload")
            ts = rec.get("timestamp")
            if not isinstance(p, dict):
                st[f"non_dict_payload:{t}"] += 1
                continue
            pt = p.get("type")
            st["records"] += 1

            if t == "session_meta":
                sm_count += 1
                sm_ids[p.get("id")] += 1
                if file_session is None:
                    file_session = {k: p.get(k) for k in
                                    ("id", "cwd", "thread_source", "agent_role", "agent_nickname", "timestamp")}
                    src = p.get("source")
                    file_session["source_kind"] = list(src.keys())[0] if isinstance(src, dict) and src else src
                continue

            if t == "turn_context":
                tid = p.get("turn_id")
                st["turn_context"] += 1
                if tid is None:
                    continue
                if cur is None or cur["turn_id"] != tid:
                    inst = last_by_tid.get(tid)
                    if inst is None:
                        inst = new_instance(tid, ts, None, lineno, last_goal)
                        instances.append(inst)
                        last_by_tid[tid] = inst
                        st["ctx_without_start"] += 1
                    cur = inst
                if cur["ctx"] is None:
                    cur["ctx"] = {"model": p.get("model"), "effort": p.get("effort"), "cwd": p.get("cwd")}
                    ctx_models[p.get("model")] += 1
                continue

            if t == "compacted":
                st["compacted_records"] += 1
                if open_cur():
                    cur["events"].append(("K",))
                    cur["n_compact"] += 1
                else:
                    st["compacted_outside_turn"] += 1
                continue

            if t == "event_msg":
                if pt == "task_started":
                    tid = p.get("turn_id")
                    inst = new_instance(tid, ts, p.get("started_at"), lineno, last_goal)
                    if tid in last_by_tid:
                        st["restarted_turn_id_in_file"] += 1
                    instances.append(inst)
                    last_by_tid[tid] = inst
                    cur = inst
                    orphan_calls = 0
                elif pt == "task_complete":
                    tid = p.get("turn_id")
                    inst = last_by_tid.get(tid)
                    if inst is None:
                        st["task_complete_unknown_turn"] += 1
                        o = {"turn_id": tid, "orphan_calls": orphan_calls}
                        if orphan_calls > 0:
                            ca, dm = p.get("completed_at"), p.get("duration_ms")
                            o.update({"events": orphan_buf, "last_msg": p.get("last_agent_message"), "ts": ts,
                                      "completed_at": ca, "duration_ms": dm})
                        orphan_turns.append(o)
                        orphan_buf = []
                        orphan_calls = 0
                    else:
                        inst["complete"] = True
                        inst["last_msg"] = p.get("last_agent_message")
                elif pt == "user_message":
                    if open_cur():
                        cur["events"].append(("U", p.get("message")))
                        cur["n_user_events"] += 1
                        if p.get("images") or p.get("local_images"):
                            cur["user_images"] += 1
                    else:
                        orphan_events["event_msg/user_message"] += 1
                        if cur is None:
                            orphan_buf.append(("U", p.get("message")))
                elif pt == "thread_goal_updated":
                    st["goal_events"] += 1
                    g = p.get("goal")
                    obj = g.get("objective") if isinstance(g, dict) else None
                    if isinstance(obj, str) and obj.strip():
                        last_goal = obj
                        if open_cur() and cur["goal_in_turn"] is None:
                            cur["goal_in_turn"] = obj
                elif pt == "turn_aborted":
                    if cur is not None:
                        cur["aborted"] = True
                else:
                    if open_cur():
                        cur["drop"][f"event_msg/{pt}"] += 1
                continue

            if t == "response_item":
                if not open_cur():
                    if cur is None:
                        orphan_events[f"response_item/{pt}"] += 1
                        if pt in ("function_call", "custom_tool_call"):
                            orphan_calls += 1
                            orphan_buf.append(("C", p.get("call_id"), p.get("name"),
                                               p.get("arguments") if pt == "function_call" else p.get("input"),
                                               "f" if pt == "function_call" else "c"))
                        elif pt in ("function_call_output", "custom_tool_call_output"):
                            orphan_buf.append(("O", p.get("call_id"), p.get("output"), "f" if pt == "function_call_output" else "c"))
                        elif pt == "message" and p.get("role") == "assistant":
                            tx = message_text(p.get("content"))
                            if tx and tx.strip():
                                orphan_buf.append(("A", tx))
                    else:
                        st["response_item_after_complete"] += 1
                    continue
                if pt == "message":
                    role = p.get("role")
                    text = message_text(p.get("content"))
                    if role == "assistant":
                        if text and text.strip():
                            cur["events"].append(("A", text))
                        cur["drop"]["assistant_empty"] += 0 if (text and text.strip()) else 1
                    else:
                        cur["drop"]["injected:" + classify_injected(role, text)] += 1
                elif pt in ("function_call", "custom_tool_call"):
                    cid = p.get("call_id")
                    if cid in cur["call_ids"]:
                        cur["dup_calls"] += 1
                        continue
                    cur["call_ids"].add(cid)
                    if pt == "function_call":
                        cur["events"].append(("C", cid, p.get("name"), p.get("arguments"), "f"))
                    else:
                        cur["events"].append(("C", cid, p.get("name"), p.get("input"), "c"))
                elif pt in ("function_call_output", "custom_tool_call_output"):
                    cur["events"].append(("O", p.get("call_id"), p.get("output"), "f" if pt == "function_call_output" else "c"))
                elif pt in DROP_RESPONSE_ITEMS:
                    cur["drop"][pt] += 1
                else:
                    cur["drop"][f"response_item/{pt}"] += 1
                continue

            # anything else (unknown top-level type)
            st[f"other_top_type:{t}"] += 1

    # ---- finalize instances -------------------------------------------------
    # "Own" turn = belongs to the file's own session. A forked subagent file embeds a (thinned) copy of the parent
    # history behind extra session_meta records that carry the PARENT id. Parent turns were created before the
    # child session existed, so their UUIDv7 time is earlier than the child's session id; non-v7 ids only occur
    # in the embedded history. Files whose extra session_meta records all repeat the own id (resumes) are all own.
    own_id = (file_session or {}).get("id")
    foreign_sm = sm_count - sm_ids.get(own_id, 0) if own_id else 0
    sess_ms = uuid7_ms(own_id) if own_id else None
    out_instances = []
    for inst in instances:
        if foreign_sm == 0:
            own = True
        elif sess_ms is not None and inst["turn_id"]:
            tms = uuid7_ms(inst["turn_id"])
            own = tms is not None and tms >= sess_ms - 1000
        else:
            own = inst["ctx"] is not None
        passing = inst["complete"] and len(inst["call_ids"]) >= 1
        first_user = None
        for ev in inst["events"]:
            if ev[0] == "U":
                first_user = ev[1]
                break
        d = {
            "turn_id": inst["turn_id"], "ts": inst["ts"], "started_at": inst["started_at"], "line": inst["line"],
            "ctx": inst["ctx"], "complete": inst["complete"], "last_msg": inst["last_msg"],
            "n_calls": len(inst["call_ids"]), "n_compact": inst["n_compact"], "own": own,
            "goal": inst["goal"], "goal_in_turn": inst["goal_in_turn"], "first_user": first_user,
            "n_user_events": inst["n_user_events"], "aborted": inst["aborted"],
            "user_images": inst["user_images"], "dup_calls": inst["dup_calls"],
            "drop": dict(inst["drop"]), "passing": passing,
            "events": inst["events"] if passing else None,
        }
        out_instances.append(d)
    # only the first_user text of own instances is needed for brief/report pairs; passing instances carry events
    return {"rel": rel, "size": size, "stats": st, "session": file_session, "sm_count": sm_count,
            "foreign_sm": foreign_sm, "instances": out_instances, "orphan_turns": orphan_turns, "orphan_events": orphan_events,
            "ctx_models": ctx_models, "tail_orphan_calls": orphan_calls}

	"""Stage 1: stream one rollout file, split it into turns, keep what later stages need.

	Everything is read line by line (never the whole file). Every line is JSON-parsed so that the
	malformed / scalar counts are exact. Raw content is only parsed, never executed or followed.
	"""
	import json
	import os
	import re
	from collections import Counter

	DROP_RESPONSE_ITEMS = ("reasoning", "web_search_call", "tool_search_call", "tool_search_output")

	_CTX_PREFIXES = (
	("# AGENTS.md instructions", "agents_md"),
	("<environment_context>", "environment_context"),
	("<turn_aborted>", "turn_aborted_note"),
	("<subagent_notification>", "subagent_notification"),
	("<permissions instructions>", "permissions"),
	("<model_switch>", "model_switch"),
	("<collaboration_mode>", "collaboration_mode"),
	("<skill>", "skill"),
	("<user_shell_command>", "user_shell_command"),
	("<INSTRUCTIONS>", "instructions"),
	)


	def classify_injected(role, text):
	t = (text or "").lstrip()[:60]
	for pre, name in _CTX_PREFIXES:
	if t.startswith(pre):
	return f"{role}:{name}"
	if role == "user":
	return "user:copy_or_other"
	return f"{role}:other"


	def message_text(content):
	"""Join the text parts of a response_item message content list."""
	if isinstance(content, str):
	return content
	parts = []
	if isinstance(content, list):
	for c in content:
	if isinstance(c, dict):
	tx = c.get("text")
	if isinstance(tx, str):
	parts.append(tx)
	return "\n".join(parts) if len(parts) != 1 else parts[0]


	def uuid7_ms(u):
	"""Milliseconds embedded in a UUIDv7 string, or None."""
	try:
	h = u.replace("-", "")
	if len(h) == 32 and h[12] == "7":
	return int(h[:12], 16)
	except Exception:
	pass
	return None


	def new_instance(turn_id, ts, started_at, lineno, goal):
	return {
	"turn_id": turn_id, "ts": ts, "started_at": started_at, "line": lineno,
	"ctx": None, "events": [], "call_ids": set(), "complete": False, "last_msg": None,
	"aborted": False, "n_compact": 0, "goal": goal, "goal_in_turn": None, "drop": Counter(),
	"n_user_events": 0, "user_images": 0, "dup_calls": 0,
	}


	def scan_file(args):
	path, rel = args
	st = Counter()
	size = os.path.getsize(path)
	file_session = None
	sm_count = 0
	sm_ids = Counter()
	instances = []
	cur = None
	last_by_tid = {}
	last_goal = None
	orphan_calls = 0
	orphan_buf = [] # events seen before any task_started (head of the file destroyed): kept for manual recovery
	orphan_events = Counter()
	orphan_turns = [] # task_complete seen for a turn whose start was lost
	ctx_models = Counter()

	if size == 0:
	st["empty_file"] += 1
	return {"rel": rel, "size": size, "stats": st, "session": None, "sm_count": 0, "foreign_sm": 0, "instances": [],
	"orphan_turns": [], "orphan_events": orphan_events, "pairs": []}

	def open_cur():
	return cur is not None and not cur["complete"]

	with open(path, encoding="utf-8-sig", errors="replace", newline="\n") as f:
	for lineno, line in enumerate(f):
	st["lines"] += 1
	s = line.strip()
	if not s:
	st["blank_lines"] += 1
	continue
	try:
	rec = json.loads(s)
	except (ValueError, RecursionError):
	st["malformed_lines"] += 1
	if "\x00" in s:
	st["malformed:contains_NUL_bytes"] += 1
	elif "\ufffd" in s:
	st["malformed:contains_U+FFFD_(undecodable_bytes)"] += 1
	elif s[:1] in "{[":
	st["malformed:truncated_json"] += 1
	else:
	st["malformed:non_json_text_fragment"] += 1
	continue
	if not isinstance(rec, dict):
	st["scalar_lines"] += 1
	continue
	t = rec.get("type")
	p = rec.get("payload")
	ts = rec.get("timestamp")
	if not isinstance(p, dict):
	st[f"non_dict_payload:{t}"] += 1
	continue
	pt = p.get("type")
	st["records"] += 1

	if t == "session_meta":
	sm_count += 1
	sm_ids[p.get("id")] += 1
	if file_session is None:
	file_session = {k: p.get(k) for k in
	("id", "cwd", "thread_source", "agent_role", "agent_nickname", "timestamp")}
	src = p.get("source")
	file_session["source_kind"] = list(src.keys())[0] if isinstance(src, dict) and src else src
	continue

	if t == "turn_context":
	tid = p.get("turn_id")
	st["turn_context"] += 1
	if tid is None:
	continue
	if cur is None or cur["turn_id"] != tid:
	inst = last_by_tid.get(tid)
	if inst is None:
	inst = new_instance(tid, ts, None, lineno, last_goal)
	instances.append(inst)
	last_by_tid[tid] = inst
	st["ctx_without_start"] += 1
	cur = inst
	if cur["ctx"] is None:
	cur["ctx"] = {"model": p.get("model"), "effort": p.get("effort"), "cwd": p.get("cwd")}
	ctx_models[p.get("model")] += 1
	continue

	if t == "compacted":
	st["compacted_records"] += 1
	if open_cur():
	cur["events"].append(("K",))
	cur["n_compact"] += 1
	else:
	st["compacted_outside_turn"] += 1
	continue

	if t == "event_msg":
	if pt == "task_started":
	tid = p.get("turn_id")
	inst = new_instance(tid, ts, p.get("started_at"), lineno, last_goal)
	if tid in last_by_tid:
	st["restarted_turn_id_in_file"] += 1
	instances.append(inst)
	last_by_tid[tid] = inst
	cur = inst
	orphan_calls = 0
	elif pt == "task_complete":
	tid = p.get("turn_id")
	inst = last_by_tid.get(tid)
	if inst is None:
	st["task_complete_unknown_turn"] += 1
	o = {"turn_id": tid, "orphan_calls": orphan_calls}
	if orphan_calls > 0:
	ca, dm = p.get("completed_at"), p.get("duration_ms")
	o.update({"events": orphan_buf, "last_msg": p.get("last_agent_message"), "ts": ts,
	"completed_at": ca, "duration_ms": dm})
	orphan_turns.append(o)
	orphan_buf = []
	orphan_calls = 0
	else:
	inst["complete"] = True
	inst["last_msg"] = p.get("last_agent_message")
	elif pt == "user_message":
	if open_cur():
	cur["events"].append(("U", p.get("message")))
	cur["n_user_events"] += 1
	if p.get("images") or p.get("local_images"):
	cur["user_images"] += 1
	else:
	orphan_events["event_msg/user_message"] += 1
	if cur is None:
	orphan_buf.append(("U", p.get("message")))
	elif pt == "thread_goal_updated":
	st["goal_events"] += 1
	g = p.get("goal")
	obj = g.get("objective") if isinstance(g, dict) else None
	if isinstance(obj, str) and obj.strip():
	last_goal = obj
	if open_cur() and cur["goal_in_turn"] is None:
	cur["goal_in_turn"] = obj
	elif pt == "turn_aborted":
	if cur is not None:
	cur["aborted"] = True
	else:
	if open_cur():
	cur["drop"][f"event_msg/{pt}"] += 1
	continue

	if t == "response_item":
	if not open_cur():
	if cur is None:
	orphan_events[f"response_item/{pt}"] += 1
	if pt in ("function_call", "custom_tool_call"):
	orphan_calls += 1
	orphan_buf.append(("C", p.get("call_id"), p.get("name"),
	p.get("arguments") if pt == "function_call" else p.get("input"),
	"f" if pt == "function_call" else "c"))
	elif pt in ("function_call_output", "custom_tool_call_output"):
	orphan_buf.append(("O", p.get("call_id"), p.get("output"), "f" if pt == "function_call_output" else "c"))
	elif pt == "message" and p.get("role") == "assistant":
	tx = message_text(p.get("content"))
	if tx and tx.strip():
	orphan_buf.append(("A", tx))
	else:
	st["response_item_after_complete"] += 1
	continue
	if pt == "message":
	role = p.get("role")
	text = message_text(p.get("content"))
	if role == "assistant":
	if text and text.strip():
	cur["events"].append(("A", text))
	cur["drop"]["assistant_empty"] += 0 if (text and text.strip()) else 1
	else:
	cur["drop"]["injected:" + classify_injected(role, text)] += 1
	elif pt in ("function_call", "custom_tool_call"):
	cid = p.get("call_id")
	if cid in cur["call_ids"]:
	cur["dup_calls"] += 1
	continue
	cur["call_ids"].add(cid)
	if pt == "function_call":
	cur["events"].append(("C", cid, p.get("name"), p.get("arguments"), "f"))
	else:
	cur["events"].append(("C", cid, p.get("name"), p.get("input"), "c"))
	elif pt in ("function_call_output", "custom_tool_call_output"):
	cur["events"].append(("O", p.get("call_id"), p.get("output"), "f" if pt == "function_call_output" else "c"))
	elif pt in DROP_RESPONSE_ITEMS:
	cur["drop"][pt] += 1
	else:
	cur["drop"][f"response_item/{pt}"] += 1
	continue

	# anything else (unknown top-level type)
	st[f"other_top_type:{t}"] += 1

	# ---- finalize instances -------------------------------------------------
	# "Own" turn = belongs to the file's own session. A forked subagent file embeds a (thinned) copy of the parent
	# history behind extra session_meta records that carry the PARENT id. Parent turns were created before the
	# child session existed, so their UUIDv7 time is earlier than the child's session id; non-v7 ids only occur
	# in the embedded history. Files whose extra session_meta records all repeat the own id (resumes) are all own.
	own_id = (file_session or {}).get("id")
	foreign_sm = sm_count - sm_ids.get(own_id, 0) if own_id else 0
	sess_ms = uuid7_ms(own_id) if own_id else None
	out_instances = []
	for inst in instances:
	if foreign_sm == 0:
	own = True
	elif sess_ms is not None and inst["turn_id"]:
	tms = uuid7_ms(inst["turn_id"])
	own = tms is not None and tms >= sess_ms - 1000
	else:
	own = inst["ctx"] is not None
	passing = inst["complete"] and len(inst["call_ids"]) >= 1
	first_user = None
	for ev in inst["events"]:
	if ev[0] == "U":
	first_user = ev[1]
	break
	d = {
	"turn_id": inst["turn_id"], "ts": inst["ts"], "started_at": inst["started_at"], "line": inst["line"],
	"ctx": inst["ctx"], "complete": inst["complete"], "last_msg": inst["last_msg"],
	"n_calls": len(inst["call_ids"]), "n_compact": inst["n_compact"], "own": own,
	"goal": inst["goal"], "goal_in_turn": inst["goal_in_turn"], "first_user": first_user,
	"n_user_events": inst["n_user_events"], "aborted": inst["aborted"],
	"user_images": inst["user_images"], "dup_calls": inst["dup_calls"],
	"drop": dict(inst["drop"]), "passing": passing,
	"events": inst["events"] if passing else None,
	}
	out_instances.append(d)
	# only the first_user text of own instances is needed for brief/report pairs; passing instances carry events
	return {"rel": rel, "size": size, "stats": st, "session": file_session, "sm_count": sm_count,
	"foreign_sm": foreign_sm, "instances": out_instances, "orphan_turns": orphan_turns, "orphan_events": orphan_events,
	"ctx_models": ctx_models, "tail_orphan_calls": orphan_calls}