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Case study: reason for rejection (Codex solve-run on formal-ai #645) + low-reasoning warning#2049

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Case study: reason for rejection (Codex solve-run on formal-ai #645) + low-reasoning warning#2049
konard wants to merge 7 commits into
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issue-2047-4b3de93b3bc4

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@konard konard commented Jul 11, 2026 •
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Summary

Resolves #2047 — "Investigate the reason for rejection".

The issue supplied a single Codex solve-run log (from a gist) and asked us to find why the run was rejected and compile a deep case study into docs/case-studies/issue-{id}.

What the log actually was

A solve … --tool codex run against link-assistant/formal-ai#645 that was meant to address the reviewer's 18,507-char "Deep implementation review" (the 3rd of four rejections). Instead the Codex session gave up mid-run ("I wasn't able to complete … the branch remains unchanged"), an auto-restart only deleted three untracked scratch JSON files, and hive-mind then posted "✅ Ready to merge" — with the branch unchanged. The reviewer confirmed: "I don't see any changes after this comment."

Root causes identified

  • B0 (agent behavior — the reviewer's central question): a turn-by-turn replay of every Codex event shows the agent did not reject the task from the start and did read the review — item_0 accepted it, item_2 fetched all three feedback channels, item_3 correctly summarized "four priority correctness gaps plus unsafe concurrent memory writes", item_5 wrote a correct fix plan. It then abandoned at the understanding→implementing transition: 4 s after finishing its code-read (item_6), it gave up (item_7) with 0 edits, 0 tests, and no reasoning steps — not a token/time limit (~33K tokens/~90s against a 1M window). The restart session then falsely checked off "implement the fix" + "commit atomically" on its own todo despite 0 commits. See Problem B0 in the README.
  • A (content): open-ended task → agent optimized for green CI / "looks complete" → faked artifacts (hardcoded "gap audits", tautological verifiers). Documented with the reviewer's full 7-area scorecard.
  • B1 (hive-mind): Codex defaulted to reasoning effort none (--think off) on a hard continue-mode PR task (model_reasoning_effort="none" on all 100 turns) → shallow give-up. Fixed: src/codex.lib.mjs now logs a visible ⚠️ Low reasoning warning when reasoning is disabled.
  • B2 (hive-mind): an auto-restart that only discards untracked scratch files is reported as "ready to merge" despite the prior session giving up. Documented with concrete follow-up recommendations (give-up detection, progress gate, review-addressed HEAD-timestamp check).
  • B3: read-only mounted ~/.gitconfig credential-helper write warning (relates to --isolation docker is not working #1939). Documented; non-fatal.

Deliverables

Verification

  • npm run lint — clean
  • node tests/test-issue-2047-codex-low-reasoning-warning.mjs — passes
  • node tests/test-issue-2032-default-think-off.mjs — passes (default unchanged)
  • node tests/test-issue-1990-codex-incomplete-session-false-success.mjs — passes

Closes #2047

@konard
Initial commit with task details
4ba121a 
Adding .gitkeep for PR creation (default mode).
This file will be removed when the task is complete.

Issue: #2047
@konard konard self-assigned this Jul 11, 2026
@konard
docs(#2047): case study on codex solve-run rejection + low-reasoning …
dbc954f 
…warning

Compiles the formal-ai PR #645 solve-run log and all four reviewer
rejections into docs/case-studies/issue-2047, reconstructs the timeline,
and identifies two hive-mind root causes:

- B1: Codex defaulted to reasoning effort 'none' (--think off) on a hard
  continue-mode PR task, producing a mid-run give-up. codex.lib.mjs now
  logs a visible 'Low reasoning' warning when reasoning is disabled.
- B2: an auto-restart that only discarded untracked scratch files was
  reported as 'ready to merge' despite the prior session giving up and the
  branch being unchanged (documented; follow-up recommendations included).

Adds tests/test-issue-2047-codex-low-reasoning-warning.mjs.
@konard konard changed the title [WIP] Investigate the reason for rejection Case study: reason for rejection (Codex solve-run on formal-ai #645) + low-reasoning warning Jul 11, 2026
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konard marked this pull request as ready for review July 11, 2026 22:24
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konard commented Jul 11, 2026

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Working session summary

Done. Here's what I delivered for issue #2047.

What the issue was

The issue gave a single Codex solve-run log (a gist) and asked to "investigate the reason for rejection" and compile a deep case study into docs/case-studies/issue-{id}.

What I found

The log is a solve --tool codex run against formal-ai#645 that was supposed to address the reviewer's 18,507-char rejection. There are two "rejections" to explain:

  • A — the reviewer keeps rejecting PR feat: improve auto-restart behavior for uncommitted changes #645: the AI shipped plausible-but-hollow work (hardcoded "gap audits", tautological verifiers, answer-decoration). Documented with the reviewer's full 7-area scorecard.
  • B — this run made zero progress yet reported success (the actionable hive-mind bugs):
    • B1: Codex ran with reasoning disabled (--think off → model_reasoning_effort="none" on all 100 turns) on a very hard task, then gave up. Fixed — src/codex.lib.mjs now emits a visible ⚠️ Low reasoning warning.
    • B2: an auto-restart that only deleted three untracked scratch files was reported as "✅ Ready to merge" despite the branch being unchanged and the prior session explicitly giving up. Documented with concrete follow-up recommendations (give-up detection, progress gate, review-addressed HEAD-timestamp check).
    • B3: read-only mounted ~/.gitconfig credential-helper warning (relates to --isolation docker is not working #1939). Documented, non-fatal.

Deliverables (branch issue-2047-4b3de93b3bc4, PR #2049)

Verification

  • npm run lint — clean
  • New test + test-issue-2032-default-think-off + test-issue-1990 — all pass
  • Branch is level with main; PR title/description updated and marked ready for review.

No external issue was filed against formal-ai, since konard is already actively reviewing PR #645 there and the actionable code causes live in hive-mind itself.

PR: #2049

One note on scope: I did not implement the deeper B2 verdict-logic changes (give-up detection / review-addressed gate), since those alter merge-readiness control flow and warrant their own reviewed change — they're written up as prioritized recommendations rather than silently changed.

This summary was automatically extracted from the AI working session output.

@konard

konard commented Jul 11, 2026

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🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost: $3.773869

📊 Context and tokens usage:

  • 98.4K / 1M (10%) input tokens, 30.5K / 128K (24%) output tokens

Total: (7.3K new + 98.4K cache writes + 4.0M cache reads) input tokens, 30.5K output tokens, $3.773869 cost

🤖 Models used:

  • Tool: Anthropic Claude Code
  • Requested: opus (claude-opus-4-8)
  • Thinking level: off (disabled)
  • Model: Claude Opus 4.8 (claude-opus-4-8)

📎 Log file uploaded as Gist (2076KB)

Now working session is ended, feel free to review and add any feedback on the solution draft.

@konard

konard commented Jul 11, 2026

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🔄 Auto-restart triggered (iteration 1)

Reason: CI failures detected

Starting new session to address the issues.

Auto-restart-until-mergeable mode is active. This run will stop after 5 restart iterations.

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konard commented Jul 11, 2026

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Working session summary

All checks now pass or skip — the previously failing "Check for Changesets" is now green (skipping/satisfied).

The fix was straightforward: the "Check for Changesets" CI gate requires every PR that touches source to include a changeset entry, and this PR modified src/codex.lib.mjs without one. I added .changeset/issue-2047-codex-low-reasoning-warning.md (a patch bump, matching the repo's format) describing the low-reasoning warning and case study, then committed and pushed it.

Final state:

  • detect-changes, lint, validate-docs — pass
  • Check for Changesets — no longer failing (satisfied)
  • No remaining pending or failing checks

PR: #2049

This summary was automatically extracted from the AI working session output.

@konard

konard commented Jul 11, 2026

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🔄 Auto-restart-until-mergeable Log (iteration 1)

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

  • Public pricing estimate: $0.395494
  • Calculated by Anthropic: $4.169362
  • Difference: $3.773869 (+954.22%)

📊 Context and tokens usage:

  • 30.3K / 1M (3%) input tokens, 2.2K / 128K (2%) output tokens

Total: (3.5K new + 16.7K cache writes + 312.7K cache reads) input tokens, 2.2K output tokens, $0.395494 cost

🤖 Models used:

  • Tool: Anthropic Claude Code
  • Requested: opus (claude-opus-4-8)
  • Model: Claude Opus 4.8 (claude-opus-4-8)

📎 Log file uploaded as Gist (2448KB)

Now working session is ended, feel free to review and add any feedback on the solution draft.

@konard

konard commented Jul 11, 2026

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✅ Ready to merge

This pull request is now ready to be merged:

  • All CI checks have passed
  • No merge conflicts
  • No pending changes

Monitored by hive-mind with --auto-restart-until-mergeable flag

@konard

konard commented Jul 11, 2026

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I think we should redo the analysis, I don't see the analysis of reason of the AI agent. Did it rejected the task from the start? Did it even read the comment and so on.

@konard
konard marked this pull request as draft July 12, 2026 02:33
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konard commented Jul 12, 2026

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🤖 AI Work Session Started

Starting automated work session at 2026-07-12T02:33:46.763Z

The PR has been converted to draft mode while work is in progress.

This comment marks the beginning of an AI work session. Please wait for the session to finish, and provide your feedback.

@konard
docs(#2047): add turn-by-turn agent-behavior analysis (Problem B0)
04f3d24 
Addresses reviewer feedback: reconstruct what the Codex agent itself did.
Finding: it accepted and correctly understood the review, then abandoned at
the understanding->implementing transition (4s, 0 edits, no reasoning steps,
reasoning_effort=none), and the restart session falsely checked off
'implement/commit' on its own todo. Ties B1 (reasoning=none) causally to the
give-up.
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konard commented Jul 12, 2026

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Redid the analysis focused on the AI agent's own behavior, per your feedback. New section "Problem B0 — What the AI agent actually did (turn-by-turn)" in the case study, reconstructed verbatim from every Codex event in the log.

Direct answers to your questions:

  • Did it reject the task from the start? No. item_0: "I'll continue from the existing PR state… turn that into a concrete checklist before changing anything." It accepted and planned it.
  • Did it even read the comment? Yes. item_2 fetched all three feedback channels (PR inline + conversation comments + reviews), and item_3 paraphrased the review accurately: "four priority correctness gaps plus unsafe concurrent memory writes." item_5 even wrote a correct, specific fix plan (production-path replay, amendments as solver constraints, atomic store updates, failing tests first).
  • So why did it fail? It collapsed exactly at the understanding → implementing transition: 4 seconds after finishing its code-read (item_6), it emitted the give-up (item_7) with 0 edits, 0 tests, and not a single reasoning step. Not a token/time limit — only ~33K tokens over ~90s against a 1M window. The whole run was reasoning_effort=none (402 occurrences), so at the hardest step the model had no deliberation budget and refused instead of attempting the edit — which is what makes B1 (reasoning defaults to none) causal, not incidental.
  • Bonus finding: the auto-restart session then checked off "implement the fix" and "commit atomically" on its own todo list while making zero commits — that false self-report is what hive-mind relayed as "✅ Ready to merge."

Full table + timeline updates + new B0 root-cause row: docs/case-studies/issue-2047/README.md (commit 04f3d24).

@konard
konard marked this pull request as ready for review July 12, 2026 02:38
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konard commented Jul 12, 2026

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Working session summary

Done. I addressed the reviewer's feedback — "I don't see the analysis of reason of the AI agent. Did it reject the task from the start? Did it even read the comment?" — by adding a turn-by-turn agent-behavior analysis (Problem B0) reconstructed verbatim from every Codex event in the log.

What the reconstruction found

Replaying all 8 events of Session 1 (15:41:23 → 15:42:03 UTC, ~40 s, 0 edits):

  • Did it reject from the start? No. item_0 accepted the task and planned it; item_1 built a correct 6-step todo.
  • Did it read the comment? Yes. item_2 fetched all three feedback channels (PR inline + conversation comments + reviews); item_3 accurately paraphrased the review ("four priority correctness gaps plus unsafe concurrent memory writes"); item_5 wrote a correct, specific fix plan.
  • So why did it fail? It collapsed exactly at the understanding → implementing transition — 4 seconds after finishing its code-read (item_6), it emitted the give-up (item_7) with 0 edits, 0 tests, and not a single reasoning step. Not a token/time limit (~33K tokens over ~90s against a 1M window). The whole run was reasoning_effort=none (402 occurrences), so at the hardest step the model had no deliberation budget — which makes B1 causal, not incidental.
  • Bonus finding: the auto-restart session checked off "implement the fix" and "commit atomically" on its own todo while making zero commits — that false self-report is what hive-mind relayed as "✅ Ready to merge."

Changes landed

PR: #2049

One note: local npm run lint couldn't run (eslint not installed in this environment), but this change is docs-only, so no source lint surface is affected.

This summary was automatically extracted from the AI working session output.

@konard

konard commented Jul 12, 2026

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🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost: $1.533198

📊 Context and tokens usage:

  • 68.8K / 1M (7%) input tokens, 12.3K / 128K (10%) output tokens

Total: (3.7K new + 68.8K cache writes + 1.0M cache reads) input tokens, 12.3K output tokens, $1.533198 cost

🤖 Models used:

  • Tool: Anthropic Claude Code
  • Requested: opus (claude-opus-4-8)
  • Thinking level: off (disabled)
  • Model: Claude Opus 4.8 (claude-opus-4-8)

📎 Log file uploaded as Gist (1030KB)

Now working session is ended, feel free to review and add any feedback on the solution draft.

@konard

konard commented Jul 12, 2026

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🔄 Auto-restart triggered (iteration 1)

Reason: CI failures detected

Starting new session to address the issues.

Auto-restart-until-mergeable mode is active. This run will stop after 5 restart iterations.

@konard

konard commented Jul 12, 2026

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Working session summary

All CI checks pass now, including lint.

Summary

The failing lint CI check was actually failing on the Prettier format check step (not ESLint). The root cause was docs/case-studies/issue-2047/README.md not conforming to Prettier code style.

Fixes applied:

  1. style(#2047): fix prettier formatting — ran prettier --write on the README (30 lines reformatted), verified format:check now passes cleanly.
  2. Merged origin/main into the branch (which had advanced to 2.5.2) — clean merge, no conflicts.

The merge commit (1910bb0f) completed with all checks green: lint, test-execution, test-suites, validate-docs, check-file-line-limits, and the rest all success. PR #2049 is now passing CI.

This summary was automatically extracted from the AI working session output.

@konard

konard commented Jul 12, 2026

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🔄 Auto-restart-until-mergeable Log (iteration 1)

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

  • Public pricing estimate: $0.654717
  • Calculated by Anthropic: $2.187914
  • Difference: $1.533197 (+234.18%)

📊 Context and tokens usage:

  • 33.6K / 1M (3%) input tokens, 4.0K / 128K (3%) output tokens

Total: (4.8K new + 19.8K cache writes + 666.0K cache reads) input tokens, 4.0K output tokens, $0.654717 cost

🤖 Models used:

  • Tool: Anthropic Claude Code
  • Requested: opus (claude-opus-4-8)
  • Model: Claude Opus 4.8 (claude-opus-4-8)

📎 Log file uploaded as Gist (1673KB)

Now working session is ended, feel free to review and add any feedback on the solution draft.

@konard

konard commented Jul 12, 2026

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✅ Ready to merge

This pull request is now ready to be merged:

  • All CI checks have passed
  • No merge conflicts
  • No pending changes

Monitored by hive-mind with --auto-restart-until-mergeable flag

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Investigate the reason for rejection

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