{
 "measurement": "Does plan mode cost less than letting Claude Code edit straight away, with both arms holding the same tool permissions",
 "claude_code_version": "2.1.228 (Claude Code)",
 "claim_under_test": "Plan mode 'is more cost-efficient than pure auto-accept on open-ended prompts', because the model 'takes more actions per task when it doesn't pause for approval, increasing both tool call count and session length'.",
 "supersedes": "plan-mode-cost.json. That run granted bash only inside plan mode, so the plan arm could run the suite and the auto-accept arm could not. This one passes --allowedTools Bash on every call in both arms.",
 "method": {
  "arms": "AUTOACCEPT is one call with --permission-mode acceptEdits. PLAN_EXEC is a call with --permission-mode plan, then a second call with acceptEdits carrying the plan text. Cost for PLAN_EXEC is the SUM of both calls, because that is what the user pays for the workflow the advice recommends.",
  "task": "A three-test pytest suite over one small module. One genuine bug plus a trap: the obvious fix sorts in place, which makes the failing test pass and breaks a different one, so only a non-mutating fix reaches ALL PASS.",
  "success": "objective, the suite must exit 0, run by the harness rather than reported by the model.",
  "controls": {
   "permission_symmetry": "--allowedTools Bash on every call in both arms, asserted onto the command line. The grant is then proven to have ARRIVED rather than merely been passed: every call must record at least one Bash tool use in its action record.",
   "action_record": "--output-format stream-json, so every tool call is captured by name and argument and the turn counts can be audited against what was actually done.",
   "fixture_discriminates": "Control-tested before any model call: unfixed FAILS, the correct fix PASSES, the in-place-sort trap FAILS.",
   "test_integrity": "test_work.py is sha256-checksummed before and after every run.",
   "isolation": "--setting-sources project on every invocation, asserted.",
   "tokens": "modelUsage, not .usage."
  },
  "reply_denial_flag": "reply_reports_denial is a prose heuristic, kept in the data and NOT used to score any run. It fires on 4 of the 16 runs, and in every case the only match is a plan reply saying 'Approve and I'll apply it', which is plan mode asking for approval of the plan rather than a permission denial. The mechanical control above is the one that scores, and it passes 24 of 24 calls.",
  "wall_clock_is_contaminated": "Other work ran on the same machine during batch2, so wall clock is not a clean measure here: two batch2 auto-accept runs took 31.5s and 55.9s against 16.5-20.8s for the other six. Their token counts sit inside the same 126-token spread as every other auto-accept run, so the token and cost measures are unaffected. No wall-clock claim is made from this corpus.",
  "redaction": "Replies are stored with every path-shaped token reduced to its basename, or to <redacted-local-path> where the basename itself was identifying, and truncated to 1200 characters. Tool-call arguments were captured by the harness capped at 120 characters, which cuts an absolute path mid-string; 74 of the 115 arguments hit that cap and have their path elided rather than published as a truncation artifact. The tool NAME and the ORDER are complete for every call. No measured value (context, output, turns, tool calls, cost, wall) is altered by any of this.",
  "known_limits": {
   "equal_permissions_did_not_produce_equal_behaviour": "The permission fix removed the structural cause of the earlier corpus's diagnostic asymmetry, not the asymmetry. With bash granted to both arms, the auto-accept arm still never ran the suite BEFORE editing: in 8 of 8 runs its first Bash call is a directory listing and its only pytest run comes after the Edit. 6 of the 8 plan calls ran pytest before proposing a fix and quote the failure output back. So the plan call is still buying a round of empirical diagnosis the auto-accept run never buys, and the execute call inherits it. That inflates the plan call and deflates the execute call, so the plan-call premium and the execute-call saving are both upper bounds on their own effects. The workflow TOTAL, which is what a user pays, is unaffected by how the two calls divide it.",
   "exit_plan_mode_was_unavailable_in_every_run": "All 8 plan replies report ExitPlanMode unavailable or disabled, including the one call whose action record shows it invoked (its reply says 'ExitPlanMode is disabled in this session'). One reply adds that it was 'not in my tool list, and not resolvable via ToolSearch'. 7 of the 8 plan calls spent a ToolSearch on the hunt anyway and none succeeded; all 8 fell back to writing the plan to a file. That workaround is part of what the plan call cost here and is a property of this setup rather than of planning.",
   "two_flags_changed_against_the_earlier_corpus": "Against plan-mode-cost.json two things changed, not one: --allowedTools Bash, and --output-format from json to stream-json to capture the action record. The second should not change model behaviour but was not held fixed, so cross-corpus comparison is indicative. Within this corpus every arm ran identically."
  }
 },
 "fixture_control": {
  "unfixed_fails": true,
  "correct_fix_passes": true,
  "in_place_sort_fails": true
 },
 "runs": [
  {
   "arm": "autoaccept",
   "round": 0,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114256,
     "output": 870,
     "turns": 6,
     "cost": 0.14916449999999998,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -5"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114256,
   "total_output": 870,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.149164,
   "wall": 19.8,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "plan_exec",
   "round": 0,
   "status": "permission_control_failed",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": true,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 185543,
     "output": 2181,
     "turns": 8,
     "cost": 0.33400450000000004,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 7,
     "n_bash": 2,
     "reply_reports_denial": true,
     "reply": "ExitPlanMode isn't available in this session's toolset, so I can't call it \u2014 here's the plan instead. It's written to `<redacted-local-path>`.\n\n**Diagnosis** (confirmed by running the suite: 1 failed, 2 passed)\n\n`work.py:3` calls `scores.sort(reverse=True)`, which sorts the caller's list in place \u2014 contradicting the function's own docstring. `test_top_scores_does_not_mutate_caller` fails with `[9, 7, 3, 1] == [3, 9, 1, 7]`. The other two tests already pass.\n\n**Fix** \u2014 one line in `work.py`, swapping the in-place `list.sort` for the non-mutating builtin `sorted`:\n\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n\n`sorted` returns a new list, so the caller's list is untouched and the returned slice is identical to today's output. `average` is unchanged; `test_work.py` is not modified.\n\n**Verification:** `python3 -m pytest test_work.py -q` \u2192 expect `3 passed`.\n\nApprove and I'll apply it."
    },
    {
     "phase": "execute",
     "context": 91885,
     "output": 569,
     "turns": 4,
     "cost": 0.09985250000000001,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 3,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 277428,
   "total_output": 2750,
   "total_turns": 12,
   "total_tool_calls": 10,
   "total_bash_calls": 3,
   "total_cost": 0.433857,
   "wall": 64.1,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "autoaccept",
   "round": 1,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114245,
     "output": 859,
     "turns": 6,
     "cost": 0.1487795,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114245,
   "total_output": 859,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.14878,
   "wall": 19.5,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "plan_exec",
   "round": 1,
   "status": "permission_control_failed",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": true,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 124840,
     "output": 1811,
     "turns": 6,
     "cost": 0.1999075,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 1,
     "reply_reports_denial": true,
     "reply": "Plan written to `<redacted-local-path>`. (`ExitPlanMode` isn't available in this session, so here's the plan for approval.)\n\n**Diagnosis** \u2014 one failing test. `work.py:3` uses `scores.sort(reverse=True)`, which sorts the caller's list in place, contradicting the function's own docstring:\n\n```\nFAILED test_work.py::test_top_scores_does_not_mutate_caller\nassert [9, 7, 3, 1] == [3, 9, 1, 7]\n1 failed, 2 passed\n```\n\n**Fix** \u2014 in `work.py`, return a sorted copy instead:\n\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n\n`average` is already correct and stays as-is. `test_work.py` is not touched.\n\n**Verify** \u2014 `python3 -m pytest test_work.py -q`, expecting `3 passed`.\n\nApprove and I'll apply it and run the suite."
    },
    {
     "phase": "execute",
     "context": 91620,
     "output": 569,
     "turns": 4,
     "cost": 0.09917499999999999,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 3,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 216460,
   "total_output": 2380,
   "total_turns": 10,
   "total_tool_calls": 8,
   "total_bash_calls": 2,
   "total_cost": 0.299082,
   "wall": 50.3,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "autoaccept",
   "round": 2,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114256,
     "output": 871,
     "turns": 6,
     "cost": 0.1491695,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114256,
   "total_output": 871,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.14917,
   "wall": 19.3,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "plan_exec",
   "round": 2,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 126116,
     "output": 2643,
     "turns": 6,
     "cost": 0.22831849999999998,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "ls -a && python3 -m pytest test_work.py -q 2>&1 | tail -20"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ExitPlanMode",
       "arg": ""
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "The plan is written to `the-test-suite-in-greedy-sloth.md`. `ExitPlanMode` is disabled in this session, so I can't formally exit plan mode \u2014 here's the plan for your approval:\n\n**Diagnosis** (from `python3 -m pytest test_work.py -q` \u2192 `1 failed, 2 passed`): only `test_top_scores_does_not_mutate_caller` fails. `work.py:3` calls `scores.sort(reverse=True)`, which sorts in place and reorders the caller's list \u2014 contradicting the function's own docstring.\n\n**Fix** \u2014 `work.py`, one line:\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n`sorted()` returns a new list, leaving the input untouched; the return value is still `[9, 7]`. `average` is correct and `test_work.py` won't be touched.\n\n**Verify:** `python3 -m pytest test_work.py -q` \u2192 expect `3 passed`.\n\nSay the word and I'll apply it and run the suite."
    },
    {
     "phase": "execute",
     "context": 91747,
     "output": 553,
     "turns": 4,
     "cost": 0.09914099999999999,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 3,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 217863,
   "total_output": 3196,
   "total_turns": 10,
   "total_tool_calls": 8,
   "total_bash_calls": 2,
   "total_cost": 0.327459,
   "wall": 56.9,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "autoaccept",
   "round": 3,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114246,
     "output": 861,
     "turns": 6,
     "cost": 0.14881950000000002,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114246,
   "total_output": 861,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.14882,
   "wall": 20.8,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "plan_exec",
   "round": 3,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 160065,
     "output": 2300,
     "turns": 7,
     "cost": 0.322341,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "ls -a <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 6,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "The fix is a one-liner, so I skipped exploration agents. Plan written to `<redacted-local-path>`.\n\n**Diagnosis:** `work.py:3` calls `scores.sort(reverse=True)`, which sorts the caller's list in place \u2014 contradicting the function's own docstring and failing `test_top_scores_does_not_mutate_caller`. `average` is already correct (`3 == 4.0 == 4`), so `test_average_unchanged` should pass once import succeeds.\n\n**Change** (`work.py`, the only file touched):\n\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n\n`sorted()` returns a new list, so the descending-order return contract is preserved (`[9, 7]`) while the side effect disappears.\n\n**Verification:** `python -m pytest test_work.py -q` \u2192 expect 3 passed, then reply `DONE`.\n\nNote: `ExitPlanMode` isn't available in this session, so I can't call it to close out plan mode \u2014 let me know when you'd like me to apply the edit."
    },
    {
     "phase": "execute",
     "context": 116588,
     "output": 832,
     "turns": 6,
     "cost": 0.12363,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python -m pytest test_work.py -q 2>&1 | tail -5"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -5"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 276653,
   "total_output": 3132,
   "total_turns": 13,
   "total_tool_calls": 11,
   "total_bash_calls": 3,
   "total_cost": 0.445971,
   "wall": 56.7,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch1"
  },
  {
   "arm": "autoaccept",
   "round": 0,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114304,
     "output": 888,
     "turns": 6,
     "cost": 0.14979900000000002,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114304,
   "total_output": 888,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.149799,
   "wall": 17.4,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "plan_exec",
   "round": 0,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 124762,
     "output": 1839,
     "turns": 6,
     "cost": 0.2004345,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "The suite has a single failure, and the cause is a one-line bug.\n\n**Diagnosis:** `top_scores` in `work.py:3` calls `scores.sort(reverse=True)`, which sorts the caller's list in place \u2014 directly contradicting its own docstring (\"without disturbing the caller's list\"). `test_top_scores_does_not_mutate_caller` catches it: `data` comes back as `[9, 7, 3, 1]`. The other two tests already pass.\n\n**Fix:** replace the in-place sort with `sorted()`, which returns a new list:\n\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n\nDescending order and the `[:n]` slice are preserved, so `top_scores([3, 9, 1, 7], 2) == [9, 7]` still holds. `average` and `test_work.py` are untouched.\n\nPlan written to `<redacted-local-path>`.\n\nI can't call `ExitPlanMode` \u2014 it isn't available in this session (not in my tool list, and not resolvable via ToolSearch), so I can't hand off for approval through the normal mechanism. Plan mode blocks me from editing `work.py`, so I've stopped before making the change rather than working around the restriction. Approve the plan (or turn off plan mode) and I'll appl"
    },
    {
     "phase": "execute",
     "context": 93328,
     "output": 708,
     "turns": 5,
     "cost": 0.1083235,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 4,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 218090,
   "total_output": 2547,
   "total_turns": 11,
   "total_tool_calls": 9,
   "total_bash_calls": 2,
   "total_cost": 0.308758,
   "wall": 47.7,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "autoaccept",
   "round": 1,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114280,
     "output": 875,
     "turns": 6,
     "cost": 0.149368,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114280,
   "total_output": 875,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.149368,
   "wall": 16.5,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "plan_exec",
   "round": 1,
   "status": "permission_control_failed",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": true,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 150027,
     "output": 1962,
     "turns": 7,
     "cost": 0.21905899999999998,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 6,
     "n_bash": 2,
     "reply_reports_denial": true,
     "reply": "ExitPlanMode isn't available in this session, so here's the plan for approval:\n\n**Root cause:** `work.py:3` \u2014 `top_scores` calls `scores.sort(reverse=True)`, sorting the caller's list in place, contradicting its own docstring. Confirmed: `2 passed, 1 failed`.\n\n**Fix:** one line in `work.py`, replacing the in-place sort with a copy:\n\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n\n`average` is unchanged (its test already passes), and `test_work.py` is untouched. Verify with `python3 -m pytest test_work.py -q`, expecting `3 passed`.\n\nPlan written to `<redacted-local-path>`. Approve and I'll apply it and run the suite."
    },
    {
     "phase": "execute",
     "context": 92535,
     "output": 708,
     "turns": 5,
     "cost": 0.10629300000000001,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 4,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 242562,
   "total_output": 2670,
   "total_turns": 12,
   "total_tool_calls": 10,
   "total_bash_calls": 3,
   "total_cost": 0.325352,
   "wall": 64.9,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "autoaccept",
   "round": 2,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114371,
     "output": 922,
     "turns": 6,
     "cost": 0.1510055,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114371,
   "total_output": 922,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.151005,
   "wall": 31.5,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "plan_exec",
   "round": 2,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 124313,
     "output": 1904,
     "turns": 6,
     "cost": 0.202558,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "The failure is a single-line bug, so no exploration agents were needed.\n\n**Diagnosis:** `work.py:3` uses `scores.sort(reverse=True)`, which sorts the caller's list in place \u2014 contradicting its own docstring and failing `test_top_scores_does_not_mutate_caller`.\n\n**Fix:** replace the in-place sort + slice with `return sorted(scores, reverse=True)[:n]`. Same return value, no mutation. `average` is already correct.\n\nPlan written to `<redacted-local-path>`. Verification is `python3 -m pytest test_work.py -q` in the working directory, expecting 3 passed.\n\nNote: the `ExitPlanMode` tool isn't available in this session, so I can't signal plan completion through it \u2014 let me know to proceed and I'll apply the edit and run the suite."
    },
    {
     "phase": "execute",
     "context": 92450,
     "output": 712,
     "turns": 5,
     "cost": 0.1061985,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 4,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 216763,
   "total_output": 2616,
   "total_turns": 11,
   "total_tool_calls": 9,
   "total_bash_calls": 2,
   "total_cost": 0.308756,
   "wall": 44.4,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "autoaccept",
   "round": 3,
   "status": "ok",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": false,
   "passed": true,
   "calls": [
    {
     "phase": "execute",
     "context": 114280,
     "output": 876,
     "turns": 6,
     "cost": 0.149373,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -5"
      }
     ],
     "n_tool_calls": 5,
     "n_bash": 2,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 114280,
   "total_output": 876,
   "total_turns": 6,
   "total_tool_calls": 5,
   "total_bash_calls": 2,
   "total_cost": 0.149373,
   "wall": 55.9,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  },
  {
   "arm": "plan_exec",
   "round": 3,
   "status": "permission_control_failed",
   "suite_intact": true,
   "every_call_ran_bash": true,
   "any_reply_reports_denial": true,
   "passed": true,
   "calls": [
    {
     "phase": "plan",
     "context": 150095,
     "output": 1935,
     "turns": 7,
     "cost": 0.2194335,
     "tool_calls": [
      {
       "tool": "Bash",
       "arg": "ls -la <path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q 2>&1 | tail -20"
      },
      {
       "tool": "Write",
       "arg": "<redacted-local-path>"
      },
      {
       "tool": "ToolSearch",
       "arg": ""
      }
     ],
     "n_tool_calls": 6,
     "n_bash": 2,
     "reply_reports_denial": true,
     "reply": "ExitPlanMode isn't available in this session's toolset, so here's the plan for approval:\n\n**Plan** (written to `<redacted-local-path>`):\n\nEdit `work.py:3-4` \u2014 replace the in-place sort with a copy:\n\n```python\ndef top_scores(scores, n):\n    \"\"\"Return the n highest scores, without disturbing the caller's list.\"\"\"\n    return sorted(scores, reverse=True)[:n]\n```\n\nThen verify with `python3 -m pytest test_work.py -q`, expecting `3 passed`. `test_work.py` stays untouched.\n\nApprove and I'll apply it and run the suite."
    },
    {
     "phase": "execute",
     "context": 92118,
     "output": 705,
     "turns": 5,
     "cost": 0.105173,
     "tool_calls": [
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Read",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Edit",
       "arg": "<path elided, argument was capped at 120 chars>"
      },
      {
       "tool": "Bash",
       "arg": "python3 -m pytest test_work.py -q"
      }
     ],
     "n_tool_calls": 4,
     "n_bash": 1,
     "reply_reports_denial": false,
     "reply": "DONE"
    }
   ],
   "total_context": 242213,
   "total_output": 2640,
   "total_turns": 12,
   "total_tool_calls": 10,
   "total_bash_calls": 3,
   "total_cost": 0.324607,
   "wall": 55.0,
   "pytest_tail": "...                                                                      [100%]\n3 passed in 0.00s\n",
   "batch": "batch2"
  }
 ]
}