Evidence row 2298718

What was observed

{
  "count": 5,
  "tools": [
    {
      "description": "Ranks AP exams for one year by pass rate (share scoring 3 or higher), share of 5s, mean score or number of test takers (mean and test takers for 2024 and 2025 only), using the official College Board distributions. Give a list of exams to compare a few, or leave it empty to rank all of them.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "exams": {
            "description": "Exams to compare, e.g. [\"Calc AB\", \"Calc BC\", \"Statistics\"]. Empty means all exams.",
            "items": {
              "maxLength": 80,
              "minLength": 1,
              "type": "string"
            },
            "maxItems": 60,
            "type": "array"
          },
          "limit": {
            "description": "Maximum rows. Default 50.",
            "maximum": 60,
            "minimum": 1,
            "type": "integer"
          },
          "order": {
            "description": "desc = highest first (default), asc = lowest first.",
            "enum": [
              "desc",
              "asc"
            ],
            "type": "string"
          },
          "sort_by": {
            "description": "Ranking key. Default pass_rate (3 or higher).",
            "enum": [
              "pass_rate",
              "five_rate",
              "mean",
              "test_takers"
            ],
            "type": "string"
          },
          "year": {
            "description": "Exam year (May administration). Available: 2024, 2025, 2026. Default 2026, the latest College Board release.",
            "maximum": 2030,
            "minimum": 2024,
            "type": "integer"
          }
        },
        "type": "object"
      },
      "name": "compare_ap_exams"
    },
    {
      "description": "For an AP exam, year and score from 1 to 5, returns the percent of test takers who scored lower, the same and higher, and the midpoint percentile rank, from the official College Board distribution. Uses exact counts for 2024 and 2025 and the published whole percents for 2026.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "exam": {
            "description": "AP exam name or common short name, e.g. \"AP Biology\", \"APUSH\", \"Calc BC\", \"Lang\", \"Physics 1\", \"APES\".",
            "maxLength": 80,
            "minLength": 1,
            "type": "string"
          },
          "score": {
            "description": "AP score, 1 to 5.",
            "maximum": 5,
            "minimum": 1,
            "type": "integer"
          },
          "year": {
            "description": "Exam year (May administration). Available: 2024, 2025, 2026. Default 2026, the latest College Board release.",
            "maximum": 2030,
            "minimum": 2024,
            "type": "integer"
          }
        },
        "required": [
          "exam",
          "score"
        ],
        "type": "object"
      },
      "name": "estimate_ap_percentile"
    },
    {
      "description": "Converts multiple-choice correct answers and free-response points into a weighted composite and an estimated AP score, using the scoring worksheet and conversion chart College Board printed in its official practice exams. Only for the 7 exams with such a worksheet: AP Calculus AB (2012), AP Biology (2013), AP Statistics (2012), AP World History (2013), AP Psychology (2012), AP Macroeconomics (2012), AP Microeconomics (2012). Cut scores are never invented; other exams return an error.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "exam": {
            "description": "AP exam name or common short name, e.g. \"AP Biology\", \"APUSH\", \"Calc BC\", \"Lang\", \"Physics 1\", \"APES\".",
            "maxLength": 80,
            "minLength": 1,
            "type": "string"
          },
          "free_response_points": {
            "description": "Points earned on each free-response question, in order. The error message lists how many questions and the maximum for each.",
            "items": {
              "maximum": 100,
              "minimum": 0,
              "type": "number"
            },
            "maxItems": 12,
            "minItems": 1,
            "type": "array"
          },
          "multiple_choice_correct": {
            "description": "Number of multiple-choice questions answered correctly.",
            "maximum": 200,
            "minimum": 0,
            "type": "number"
          }
        },
        "required": [
          "exam",
          "multiple_choice_correct",
          "free_response_points"
        ],
        "type": "object"
      },
      "name": "estimate_ap_score_from_composite"
    },
    {
      "description": "Returns the College Board score distribution (percent of students scoring 5, 4, 3, 2, 1 and 3 or higher) for an AP exam and year, plus student counts, mean and standard deviation where College Board published them (2024 and 2025 PDFs). Includes the May 2026 results from the College Board 2026 AP Score Distributions page, which are newer than most model training data. Shows the 2024/2025/2026 history for the exam.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "exam": {
            "description": "AP exam name or common short name, e.g. \"AP Biology\", \"APUSH\", \"Calc BC\", \"Lang\", \"Physics 1\", \"APES\".",
            "maxLength": 80,
            "minLength": 1,
            "type": "string"
          },
          "year": {
            "description": "Exam year (May administration). Available: 2024, 2025, 2026. Default 2026, the latest College Board release.",
            "maximum": 2030,
            "minimum": 2024,
            "type": "integer"
          }
        },
        "required": [
          "exam"
        ],
        "type": "object"
      },
      "name": "get_ap_score_distribution"
    },
    {
      "description": "Lists every AP exam with College Board score distributions in this server, the years available for each, the source of each year, and which exams have a College Board scoring worksheet for composite score estimates.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "year": {
            "description": "Exam year (May administration). Available: 2024, 2025, 2026. Default 2026, the latest College Board release.",
            "maximum": 2030,
            "minimum": 2024,
            "type": "integer"
          }
        },
        "type": "object"
      },
      "name": "list_ap_exams"
    }
  ]
}

What the leaf hashes

{"body":"263abdefe604c54ac84675033f2b36dbece87a6bff054b42870a3eb34a1464ae","id":2298718,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793661127873541,"prev":null,"subject":"1e01b334-7a7f-4e65-a777-0284582e8d41","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-02 (444186 rows).

1. 0xb44a20c362f430f79351a9a731d4886095b5e86c1b70af27168b4534b1c363a1
2. 0x49c66da288a9fcc3ccf9ac3794be25419d234595f13e70ec53dd0f3ce3297698
3. 0x2fd7c18f2804a133d0a3e261b22d97c7ab0a869333a2e717cf0ef8ad202fcae2
4. 0x276db3f319faed496f2cca2db6f5cae44afcaf516628412defc15d13a0b68bb6
5. 0x16c1647a78c0528fe2256b6438c78a9828b1c8958ebf25c4ecc61d26c9f15efa
6. 0xf890d0c5abf17c8c52a2ba6d065cd63feea50dbafcb5ba4e3a7de9c6ecc430d9
7. 0xa1cd2aa825dc73ce47bbbc278b6470e4a9d99b9fce59167212b35dd8114ef521
8. 0xff2baa699a26b17ba92a999ea8e20a153970b28e112fdcbcdd73272d7bb9e09d
9. 0x9ec66aaeeaed9ebc45336c3ef722a2847f4d50247f2bdc9abe926018f3567e74
10. 0x8693cacac08eb920ce215d88baf19fc04bf175bb340082daf2061648b3f859d8
11. 0xae3d752497e0b1117ec3e1c4e69aabf294556064d09c8f5a7ec60bea1e2919c0
12. 0x699ae7fef9e8b87b378f2b7f3c6ae482aa3f19000267f273752a19f30c704991
13. 0x8f3b097427a1bfae26e9231cb5b00552011a27ad93aa4c0d3e267190fcbbb962
14. 0x08da04eef748b7ac08271324db18913501d72c52afa240bf3f08b6da46e3b97f
15. 0x834b6b9a36b42da183e2542785e8d2d7548ace455268a81922edbe6020cef644
16. 0x2922573a524a0694086782ac45fa3083d3fc3f6a2a479b2105e1e2f06b2916f7
17. 0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2
18. 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
19. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af