{
  "baseline": {
    "age_matched": {
      "buckets_used": 4,
      "gap": 0.03940163109686293,
      "tagged_lines_covered": 1.0,
      "tagged_rate": 0.24298710582868668,
      "untagged_rate": 0.20358547473182376
    },
    "by_age": [
      {
        "from_days": 0,
        "tagged": {
          "cap_lines": 983,
          "capped_survival_rate": 0.7125936815849239,
          "commits": 7312,
          "introduced": 2236643,
          "largest_commit_share": 0.11093008584740613,
          "median_survival": 0.8285714285714286,
          "survival_rate": 0.6825800988356211,
          "surviving": 1526688
        },
        "to_days": 30,
        "untagged": {
          "cap_lines": 1098,
          "capped_survival_rate": 0.6945814745408943,
          "commits": 2445,
          "introduced": 1473139,
          "largest_commit_share": 0.42658703625387695,
          "median_survival": 0.8082101214088231,
          "survival_rate": 0.6324535566569075,
          "surviving": 931692
        }
      },
      {
        "from_days": 30,
        "tagged": {
          "cap_lines": 1416,
          "capped_survival_rate": 0.42143217050022974,
          "commits": 3144,
          "introduced": 4808269,
          "largest_commit_share": 0.6981371050579741,
          "median_survival": 0.40985253371502106,
          "survival_rate": 0.12196655386793043,
          "surviving": 586448
        },
        "to_days": 90,
        "untagged": {
          "cap_lines": 2115,
          "capped_survival_rate": 0.2747060072219842,
          "commits": 1871,
          "introduced": 9079992,
          "largest_commit_share": 0.3806074939273074,
          "median_survival": 0.0,
          "survival_rate": 0.07253607712429702,
          "surviving": 658627
        }
      },
      {
        "from_days": 90,
        "tagged": {
          "cap_lines": 1427,
          "capped_survival_rate": 0.002352652481303784,
          "commits": 2257,
          "introduced": 818691,
          "largest_commit_share": 0.04107899073032439,
          "median_survival": 0.0,
          "survival_rate": 0.0016343162438575726,
          "surviving": 1338
        },
        "to_days": 180,
        "untagged": {
          "cap_lines": 1677,
          "capped_survival_rate": 0.01637513411647015,
          "commits": 465,
          "introduced": 267881,
          "largest_commit_share": 0.20711435301495815,
          "median_survival": 0.0,
          "survival_rate": 0.009944714257450136,
          "surviving": 2664
        }
      },
      {
        "from_days": 180,
        "tagged": {
          "cap_lines": 1612,
          "capped_survival_rate": 0.00016705336426914153,
          "commits": 870,
          "introduced": 838546,
          "largest_commit_share": 0.557441094465897,
          "median_survival": 0.0,
          "survival_rate": 0.0000429314551616727,
          "surviving": 36
        },
        "to_days": 365,
        "untagged": {
          "cap_lines": 2668,
          "capped_survival_rate": 0.00017657873042597227,
          "commits": 1207,
          "introduced": 962867,
          "largest_commit_share": 0.20474271109093986,
          "median_survival": 0.0,
          "survival_rate": 0.0001713632308511975,
          "surviving": 165
        }
      },
      {
        "from_days": 365,
        "tagged": {
          "cap_lines": null,
          "capped_survival_rate": null,
          "commits": 0,
          "introduced": 0,
          "largest_commit_share": null,
          "median_survival": null,
          "survival_rate": null,
          "surviving": 0
        },
        "to_days": 730,
        "untagged": {
          "cap_lines": null,
          "capped_survival_rate": null,
          "commits": 0,
          "introduced": 0,
          "largest_commit_share": null,
          "median_survival": null,
          "survival_rate": null,
          "surviving": 0
        }
      },
      {
        "from_days": 730,
        "tagged": {
          "cap_lines": null,
          "capped_survival_rate": null,
          "commits": 0,
          "introduced": 0,
          "largest_commit_share": null,
          "median_survival": null,
          "survival_rate": null,
          "surviving": 0
        },
        "to_days": null,
        "untagged": {
          "cap_lines": null,
          "capped_survival_rate": null,
          "commits": 0,
          "introduced": 0,
          "largest_commit_share": null,
          "median_survival": null,
          "survival_rate": null,
          "surviving": 0
        }
      }
    ],
    "oldest_surviving": {
      "age_days": 248,
      "commits_before": 771,
      "date": "2026-02-04",
      "introduced_before": 959166,
      "tagged_commits_before": 249,
      "tagged_introduced_before": 669578
    },
    "untagged": {
      "cap_lines": 1677,
      "capped_survival_rate": 0.3269684543975616,
      "commits": 5988,
      "introduced": 11783879,
      "largest_commit_share": 0.29327465090230476,
      "median_survival": 0.0,
      "survival_rate": 0.13519724701857513,
      "surviving": 1593148
    }
  },
  "by_agent": {
    "claude-code": {
      "cap_lines": 1382,
      "capped_survival_rate": 0.40818248649822253,
      "commits": 10044,
      "introduced": 7981913,
      "largest_commit_share": 0.4205546965996748,
      "median_survival": 0.25,
      "survival_rate": 0.21030823062090503,
      "surviving": 1678662
    },
    "cursor": {
      "cap_lines": 40,
      "capped_survival_rate": 0.0,
      "commits": 1,
      "introduced": 40,
      "largest_commit_share": 1.0,
      "median_survival": 0.0,
      "survival_rate": 0.0,
      "surviving": 0
    },
    "github-copilot": {
      "cap_lines": 25,
      "capped_survival_rate": 0.0,
      "commits": 1,
      "introduced": 25,
      "largest_commit_share": 1.0,
      "median_survival": 0.0,
      "survival_rate": 0.0,
      "surviving": 0
    },
    "openai-codex": {
      "cap_lines": 714,
      "capped_survival_rate": 0.6711690116535599,
      "commits": 3537,
      "introduced": 720171,
      "largest_commit_share": 0.048226046314000424,
      "median_survival": 0.8336448598130841,
      "survival_rate": 0.6052007092759913,
      "surviving": 435848
    }
  },
  "coverage": {
    "blame_flags": [
      "-w",
      "-M",
      "-C"
    ],
    "ignore_revs_file": true,
    "method": "v4",
    "sample_floor": 5,
    "shallow": false,
    "small_sample": false
  },
  "method": "v4",
  "probable": {
    "cap_lines": 10000,
    "capped_survival_rate": 0.003617654152263044,
    "commits": 2,
    "introduced": 29989,
    "largest_commit_share": 0.9186701790656574,
    "median_survival": 0.00922509225092251,
    "survival_rate": 0.0015005502017406383,
    "surviving": 45
  },
  "repository": {
    "head": "7688150e0abb36c3e061e5ebb9c9c3d77ee4e0e0",
    "origin": "https://github.com/smithersai/smithers"
  },
  "total_commits": 19573,
  "verified": {
    "cap_lines": 1177,
    "capped_survival_rate": 0.46321428918790747,
    "commits": 13583,
    "introduced": 8702149,
    "largest_commit_share": 0.38574735964645057,
    "median_survival": 0.5679012345679012,
    "survival_rate": 0.24298710582868668,
    "surviving": 2114510
  }
}