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1ab3545 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | #!/usr/bin/env python3
"""Bounded, receipt-producing queue loop for an agent CLI.
Queue rows are JSON objects with an ``id`` and ``objective``. The loop skips
completed IDs, passes one item at a time to an agent command, runs an external
verification command, and persists every attempt as JSONL state.
The script edits nothing itself. Run it in a branch, worktree, or sandbox that
matches the permissions described in each queue item.
"""
from __future__ import annotations
import argparse
import datetime as dt
import json
import os
import shlex
import subprocess
import sys
from pathlib import Path
from typing import Any
def load_jsonl(path: Path) -> list[dict[str, Any]]:
rows: list[dict[str, Any]] = []
seen_ids: set[str] = set()
for number, line in enumerate(path.read_text(encoding="utf-8").splitlines(), start=1):
if not line.strip():
continue
try:
row = json.loads(line)
except json.JSONDecodeError as error:
raise ValueError(f"{path}:{number}: invalid JSON: {error}") from error
if not isinstance(row, dict) or not isinstance(row.get("id"), str) or not row["id"].strip():
raise ValueError(f"{path}:{number}: each row needs a non-empty string 'id'")
if not isinstance(row.get("objective"), str) or not row["objective"].strip():
raise ValueError(f"{path}:{number}: each row needs a non-empty string 'objective'")
if row["id"] in seen_ids:
raise ValueError(f"{path}:{number}: duplicate item id {row['id']!r}")
seen_ids.add(row["id"])
rows.append(row)
return rows
def completed_ids(state_path: Path) -> set[str]:
if not state_path.exists():
return set()
completed: set[str] = set()
for number, line in enumerate(state_path.read_text(encoding="utf-8").splitlines(), start=1):
if not line.strip():
continue
try:
row = json.loads(line)
except json.JSONDecodeError as error:
raise ValueError(f"{state_path}:{number}: invalid JSON: {error}") from error
if not isinstance(row, dict) or not isinstance(row.get("id"), str):
raise ValueError(f"{state_path}:{number}: each receipt needs a string 'id'")
if row.get("status") == "completed":
completed.add(row["id"])
return completed
def append_receipt(state_path: Path, receipt: dict[str, Any]) -> None:
state_path.parent.mkdir(parents=True, exist_ok=True)
with state_path.open("a", encoding="utf-8") as handle:
handle.write(json.dumps(receipt, ensure_ascii=True, sort_keys=True) + "\n")
def utc_now() -> str:
return dt.datetime.now(dt.timezone.utc).isoformat(timespec="seconds")
def command_argv(command: str, *, item_id: str) -> list[str]:
return [argument.replace("{id}", item_id) for argument in shlex.split(command)]
def main() -> int:
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument("--queue", type=Path, required=True, help="JSONL work queue")
parser.add_argument("--state", type=Path, default=Path("QUEUE_PROGRESS.jsonl"), help="durable JSONL receipt log")
parser.add_argument("--agent-command", help="agent CLI; the item prompt is appended as one argument")
parser.add_argument("--verify-command", help="deterministic command; {id} expands to the current item ID")
parser.add_argument("--max-items", type=int, default=5, help="maximum unprocessed items per run")
parser.add_argument("--max-retries", type=int, default=2, help="agent attempts per item")
parser.add_argument("--command-timeout", type=int, default=900, help="seconds allowed for each agent or verifier command")
parser.add_argument("--dry-run", action="store_true", help="validate and display pending work without invoking commands")
args = parser.parse_args()
if args.max_items < 1 or args.max_retries < 1 or args.command_timeout < 1:
parser.error("--max-items, --max-retries, and --command-timeout must be positive")
if not args.dry_run and (not args.agent_command or not args.verify_command):
parser.error("--agent-command and --verify-command are required unless --dry-run is used")
try:
queue = load_jsonl(args.queue)
done = completed_ids(args.state)
except (OSError, ValueError) as error:
print(error, file=sys.stderr)
return 3
pending = [item for item in queue if item["id"] not in done][: args.max_items]
if args.dry_run:
print(json.dumps({"queue_items": len(queue), "completed": len(done), "pending_this_run": pending}, indent=2))
return 0
if not pending:
print("[queue] no pending work")
return 0
agent_argv = command_argv(args.agent_command, item_id="")
for item in pending:
item_id = item["id"]
print(f"[queue] processing {item_id}", file=sys.stderr)
for attempt in range(1, args.max_retries + 1):
prompt = "\n".join(
[
"You are one bounded worker inside a durable work-queue loop.",
"",
"Work item:",
json.dumps(item, indent=2, ensure_ascii=True),
"",
f"Attempt: {attempt} of {args.max_retries}",
f"Command timeout: {args.command_timeout} seconds",
f"State log: {args.state}",
"",
"Rules:",
"- Read repository instructions and prior receipts before acting.",
"- Stay inside the permissions and scope named by the item.",
"- Make the smallest change that satisfies the objective.",
"- Do not decide that the item is complete; an external command verifies it.",
"- Leave enough evidence for a human to review the attempt.",
]
)
try:
agent_result = subprocess.run([*agent_argv, prompt], check=False, timeout=args.command_timeout)
verify_argv = command_argv(args.verify_command, item_id=item_id)
verify_env = {**os.environ, "LOOP_ITEM_ID": item_id}
verify_result = subprocess.run(verify_argv, check=False, env=verify_env, timeout=args.command_timeout)
except subprocess.TimeoutExpired:
append_receipt(
args.state,
{
"id": item_id,
"attempt": attempt,
"status": "retry",
"reason": f"agent or verifier exceeded {args.command_timeout}s timeout",
"timestamp": utc_now(),
},
)
print(
f"[queue] {item_id}: command exceeded {args.command_timeout}s timeout",
file=sys.stderr,
)
continue
except OSError as error:
append_receipt(
args.state,
{
"id": item_id,
"attempt": attempt,
"status": "escalated",
"reason": f"command could not start: {error}",
"timestamp": utc_now(),
},
)
print(f"[queue] {item_id}: command could not start: {error}", file=sys.stderr)
return 3
status = "completed" if agent_result.returncode == 0 and verify_result.returncode == 0 else "retry"
append_receipt(
args.state,
{
"id": item_id,
"attempt": attempt,
"status": status,
"agent_exit": agent_result.returncode,
"verify_exit": verify_result.returncode,
"timestamp": utc_now(),
},
)
if status == "completed":
print(f"[queue] {item_id}: verified", file=sys.stderr)
break
else:
append_receipt(
args.state,
{
"id": item_id,
"attempt": args.max_retries,
"status": "escalated",
"reason": "retry budget exhausted",
"timestamp": utc_now(),
},
)
print(f"[queue] {item_id}: retry budget exhausted; escalating", file=sys.stderr)
return 2
return 0
if __name__ == "__main__":
raise SystemExit(main())
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