{
  "baseline": {
    "age_matched": {
      "buckets_used": 4,
      "gap": -0.08262784087433417,
      "tagged_lines_covered": 1.0,
      "tagged_rate": 0.25870821855236237,
      "untagged_rate": 0.34133605942669654
    },
    "by_age": [
      {
        "from_days": 0,
        "tagged": {
          "cap_lines": 1022,
          "capped_survival_rate": 0.7503046389233342,
          "commits": 7566,
          "introduced": 2362240,
          "largest_commit_share": 0.10503208818748307,
          "median_survival": 0.8431372549019608,
          "survival_rate": 0.7081291486047142,
          "surviving": 1672771
        },
        "to_days": 30,
        "untagged": {
          "cap_lines": 985,
          "capped_survival_rate": 0.7176197554396246,
          "commits": 2664,
          "introduced": 1422452,
          "largest_commit_share": 0.441787842401712,
          "median_survival": 0.8461538461538461,
          "survival_rate": 0.6343398582166568,
          "surviving": 902318
        }
      },
      {
        "from_days": 30,
        "tagged": {
          "cap_lines": 1412,
          "capped_survival_rate": 0.4639172476444367,
          "commits": 3325,
          "introduced": 4876858,
          "largest_commit_share": 0.6883183803998394,
          "median_survival": 0.5348837209302325,
          "survival_rate": 0.13446813501643887,
          "surviving": 655782
        },
        "to_days": 90,
        "untagged": {
          "cap_lines": 2113,
          "capped_survival_rate": 0.3294607635876458,
          "commits": 1773,
          "introduced": 2161974,
          "largest_commit_share": 0.26984875858821616,
          "median_survival": 0.0,
          "survival_rate": 0.3233003727149355,
          "surviving": 698967
        }
      },
      {
        "from_days": 90,
        "tagged": {
          "cap_lines": 1375,
          "capped_survival_rate": 0.005149422916807874,
          "commits": 2652,
          "introduced": 930878,
          "largest_commit_share": 0.03612825740859704,
          "median_survival": 0.0,
          "survival_rate": 0.0034322435378212825,
          "surviving": 3195
        },
        "to_days": 180,
        "untagged": {
          "cap_lines": 1589,
          "capped_survival_rate": 0.0432245890185728,
          "commits": 778,
          "introduced": 7216905,
          "largest_commit_share": 0.47886358487467967,
          "median_survival": 0.0,
          "survival_rate": 0.0013212034798850754,
          "surviving": 9535
        }
      },
      {
        "from_days": 180,
        "tagged": {
          "cap_lines": 1564,
          "capped_survival_rate": 0.00016502936147389557,
          "commits": 888,
          "introduced": 843205,
          "largest_commit_share": 0.5543610391304605,
          "median_survival": 0.0,
          "survival_rate": 0.000042694243985744865,
          "surviving": 36
        },
        "to_days": 365,
        "untagged": {
          "cap_lines": 2478,
          "capped_survival_rate": 0.0001739536146096049,
          "commits": 1264,
          "introduced": 1023987,
          "largest_commit_share": 0.19252197537664054,
          "median_survival": 0.0,
          "survival_rate": 0.00016699430754492,
          "surviving": 171
        }
      },
      {
        "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": 256,
      "commits_before": 771,
      "date": "2026-02-04",
      "introduced_before": 959166,
      "tagged_commits_before": 249,
      "tagged_introduced_before": 669578
    },
    "untagged": {
      "cap_lines": 1610,
      "capped_survival_rate": 0.33696949385864766,
      "commits": 6479,
      "introduced": 11825318,
      "largest_commit_share": 0.29224693999772355,
      "median_survival": 0.007356520798398875,
      "survival_rate": 0.13623236178511225,
      "surviving": 1610991
    }
  },
  "by_agent": {
    "claude-code": {
      "cap_lines": 1367,
      "capped_survival_rate": 0.4402354624008722,
      "commits": 10819,
      "introduced": 8268098,
      "largest_commit_share": 0.4059979695451118,
      "median_survival": 0.3855444072835377,
      "survival_rate": 0.2270458090845077,
      "surviving": 1877237
    },
    "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": 734,
      "capped_survival_rate": 0.6712716601645052,
      "commits": 3610,
      "introduced": 745018,
      "largest_commit_share": 0.04661766561344827,
      "median_survival": 0.8301886792452831,
      "survival_rate": 0.6101154602976036,
      "surviving": 454547
    }
  },
  "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": "515536ad5a7ea48d4f7c669f3f4978ed6ef908d1",
    "origin": "https://github.com/smithersai/smithers"
  },
  "total_commits": 20912,
  "verified": {
    "cap_lines": 1181,
    "capped_survival_rate": 0.4870443639915415,
    "commits": 14431,
    "introduced": 9013181,
    "largest_commit_share": 0.3724357693471373,
    "median_survival": 0.6106870229007634,
    "survival_rate": 0.25870821855236237,
    "surviving": 2331784
  }
}
