{
 "number": 36210,
 "input_hash": "30b2ec6e66ebe6bc",
 "model": "openrouter/google/gemini-3.8-flash",
 "batch": false,
 "created": "2026-09-17T16:23:29+00:00",
 "provider": "Google",
 "stop_reason": "end_turn",
 "usage": {
  "input_tokens": 14900,
  "cache_creation_input_tokens": 0,
  "cache_read_input_tokens": 0,
  "output_tokens": 1644
 },
 "cost_usd": 0.01734,
 "error": null,
 "result": {
  "display": {
   "goal": [
    "Include the operating system error details in AutoFile and BufferedFile exception messages",
    "Give operators and developers actionable reasons when file read or write operations fail"
   ],
   "reviewability": [
    "Ready to review",
    "Self-contained changes with portable unit tests covering POSIX and Windows"
   ],
   "agreement": [
    "No reviews or feedback yet (crickets)"
   ],
   "categories": [
    {
     "name": "utils",
     "why": [
      "P3 because it improves error diagnosability across all callers using AutoFile for I/O",
      "Preserves the underlying OS errno so logs and exceptions distinguish between disk-full, permissions, and other I/O errors"
     ]
    }
   ]
  },
  "summary": "Captures errno immediately after failed fread/fwrite calls in AutoFile and BufferedFile and appends the OS error message via SysErrorString() to thrown std::ios_base::failure exceptions. Adds unit test coverage in streams_tests to verify error string propagation across POSIX and Windows platforms.",
  "problem": "AutoFile and BufferedFile throw fixed exception strings on real I/O failures, discarding errno and preventing callers from diagnosing why an I/O operation failed (such as out-of-space or permission errors).",
  "discussion": {
   "open_concerns": [],
   "resolved_concerns": [
    "Alpine musl libc CI failure resolved by closing the file descriptor to trigger a genuine kernel-level EBADF rather than relying on libc-specific direction checks."
   ],
   "author_status": "active"
  },
  "reviewability": {
   "state": "Ready",
   "label": "Ready",
   "reason": "The PR is small, self-contained, tests pass, and there are no blockers or unaddressed reviewer requests."
  },
  "agreement": {
   "state": "Crickets",
   "summary": "No reviews or concept feedback yet",
   "reason": "The PR has had no reviewer comments since opening.",
   "evidence": []
  },
  "dependencies": {
   "depends_on": [],
   "enables": [
    "Better error reporting for callers switching to AutoFile, such as wallet dump in #35492"
   ]
  },
  "categories": [
   {
    "name": "utils",
    "member": true,
    "evidence": "Changes core stream primitives in src/streams.h and src/streams.cpp.",
    "band": "P3",
    "reason_tag": "diagnostics",
    "score": 0.32,
    "factors": {
     "security_stability": 0,
     "bug_severity": 1,
     "performance": 0,
     "user_value": 1,
     "leverage": 1
    },
    "rationale": "Improves diagnostics on stream I/O failures across the node by preserving errno. While not fixing a critical bug or security issue, providing meaningful error reasons rather than generic failure messages is a clear, durable improvement to shared utility code."
   }
  ],
  "confidence": "high",
  "uncertainties": [],
  "needs": [],
  "card": "This PR updates AutoFile and BufferedFile stream implementations to capture errno on failing fread and fwrite calls, appending the formatted system error string to thrown std::ios_base::failure exceptions. This ensures error messages surfaced to logs and callers distinguish underlying OS causes such as out-of-space, bad descriptors, or permission issues. Comprehensive unit tests are added to verify error propagation across platforms. The pull request is clean, has passing CI, and currently awaits initial reviewer attention."
 },
 "raw_text": null
}