Evidence row 258117

What was observed

{
  "count": 10,
  "tools": [
    {
      "description": "Browse top-level nodes or immediate children. Curated families return node_kind=codelist containers at root; pass that code as parent_code to browse its options.",
      "inputSchema": {
        "properties": {
          "classification_id": {
            "title": "Classification Id",
            "type": "string"
          },
          "limit": {
            "default": 200,
            "maximum": 500,
            "minimum": 1,
            "title": "Limit",
            "type": "integer"
          },
          "parent_code": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Parent Code"
          }
        },
        "required": [
          "classification_id"
        ],
        "title": "browse_hierarchyArguments",
        "type": "object"
      },
      "name": "browse_hierarchy"
    },
    {
      "description": "Return a structured choice list at a selected hierarchy level. MICS exports require one codelist_id and never merge unrelated answer lists.",
      "inputSchema": {
        "properties": {
          "classification_id": {
            "title": "Classification Id",
            "type": "string"
          },
          "codelist_id": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Codelist Id"
          },
          "format": {
            "default": "xlsform",
            "enum": [
              "xlsform",
              "simple"
            ],
            "title": "Format",
            "type": "string"
          },
          "level": {
            "anyOf": [
              {
                "type": "integer"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Level"
          },
          "limit": {
            "default": 1000,
            "maximum": 10000,
            "minimum": 1,
            "title": "Limit",
            "type": "integer"
          }
        },
        "required": [
          "classification_id"
        ],
        "title": "export_choice_listArguments",
        "type": "object"
      },
      "name": "export_choice_list"
    },
    {
      "description": "Get authoritative metadata and coverage for one classification_id returned by list_classifications.",
      "inputSchema": {
        "properties": {
          "classification_id": {
            "title": "Classification Id",
            "type": "string"
          }
        },
        "required": [
          "classification_id"
        ],
        "title": "get_classificationArguments",
        "type": "object"
      },
      "name": "get_classification"
    },
    {
      "description": "Retrieve one exact code or codelist container, including its node_kind, hierarchy position and explanatory notes.",
      "inputSchema": {
        "properties": {
          "classification_id": {
            "title": "Classification Id",
            "type": "string"
          },
          "code": {
            "title": "Code",
            "type": "string"
          }
        },
        "required": [
          "classification_id",
          "code"
        ],
        "title": "get_code_definitionArguments",
        "type": "object"
      },
      "name": "get_code_definition"
    },
    {
      "description": "List classification families, versions, custodians, coverage and licensing notes. Start here when the correct standard is unknown.",
      "inputSchema": {
        "properties": {
          "domain": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Domain"
          },
          "status": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Status"
          }
        },
        "title": "list_classificationsArguments",
        "type": "object"
      },
      "name": "list_classifications"
    },
    {
      "description": "List independent option lists within a classification before searching or exporting one list.",
      "inputSchema": {
        "properties": {
          "classification_id": {
            "title": "Classification Id",
            "type": "string"
          }
        },
        "required": [
          "classification_id"
        ],
        "title": "list_codelistsArguments",
        "type": "object"
      },
      "name": "list_codelists"
    },
    {
      "description": "Apply official stored correspondences and expose splits, merges, changed meanings and unmapped codes. Never assume one-to-one equivalence.",
      "inputSchema": {
        "properties": {
          "codes": {
            "items": {
              "type": "string"
            },
            "minItems": 1,
            "title": "Codes",
            "type": "array"
          },
          "source_classification_id": {
            "title": "Source Classification Id",
            "type": "string"
          },
          "target_classification_id": {
            "title": "Target Classification Id",
            "type": "string"
          }
        },
        "required": [
          "source_classification_id",
          "target_classification_id",
          "codes"
        ],
        "title": "map_codesArguments",
        "type": "object"
      },
      "name": "map_codes"
    },
    {
      "description": "Return a deterministic ranked shortlist of all relevant classification concepts and codelists. Ranking supports user choice; it is not an automatic selection. Include answer options and context.",
      "inputSchema": {
        "properties": {
          "answer_options": {
            "anyOf": [
              {
                "items": {
                  "type": "string"
                },
                "type": "array"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Answer Options"
          },
          "limit": {
            "default": 5,
            "maximum": 20,
            "minimum": 1,
            "title": "Limit",
            "type": "integer"
          },
          "question_text": {
            "title": "Question Text",
            "type": "string"
          },
          "survey_context": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Survey Context"
          }
        },
        "required": [
          "question_text"
        ],
        "title": "recommend_classificationsArguments",
        "type": "object"
      },
      "name": "recommend_classifications"
    },
    {
      "description": "Full-text search labels and notes. Results restrict to one option list only when codelist_id is explicitly supplied.",
      "inputSchema": {
        "properties": {
          "classification_ids": {
            "anyOf": [
              {
                "items": {
                  "type": "string"
                },
                "type": "array"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Classification Ids"
          },
          "codelist_id": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ],
            "default": null,
            "title": "Codelist Id"
          },
          "limit": {
            "default": 20,
            "maximum": 100,
            "minimum": 1,
            "title": "Limit",
            "type": "integer"
          },
          "query": {
            "title": "Query",
            "type": "string"
          }
        },
        "required": [
          "query"
        ],
        "title": "search_codesArguments",
        "type": "object"
      },
      "name": "search_codes"
    },
    {
      "description": "Validate exact codes against one named classification version.",
      "inputSchema": {
        "properties": {
          "classification_id": {
            "title": "Classification Id",
            "type": "string"
          },
          "codes": {
            "items": {
              "type": "string"
            },
            "minItems": 1,
            "title": "Codes",
            "type": "array"
          }
        },
        "required": [
          "classification_id",
          "codes"
        ],
        "title": "validate_codesArguments",
        "type": "object"
      },
      "name": "validate_codes"
    }
  ]
}

What the leaf hashes

{"body":"8106c263076b97bfef4dd4d260feb89b5412857f1fca4054ae810681e1c431d8","id":258117,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793029944408323,"prev":null,"subject":"6ede47d4-f487-4282-a85e-7b65ae962ef1","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0xef7beca89721d69891d3ec38465a0fd4505566d0466348a886d5886111c3a4f7
2. 0x9bb99fe47777809b58924c04b8840c9d5141d728a15791624578724c9f775943
3. 0x174e1cbfed9bbda9916f4ae4bce0baf0659df06800b0db7437dd3a43b8c5cdc7
4. 0xc3b984b55f3fa170c0a19b749c71fd3019b406dd704c1d18c31da73e81fa0c1e
5. 0x2465da740c659036dd653a4619431c29f40388b42577bd705ee5a646b852103f
6. 0xcbdc3d194a24aa449038831d4b7de64b58133fb026548a3372a82c87c98ef1f2
7. 0x9716dd7e8301c72fed62acbe70a1f2d6f6c9e40df0ebd0027fd17f50f842a456
8. 0x403ab3fd8e515ba3b58b0ff4eed8d786a44d2a86d5264e5ba055cc7a7b8b3ded
9. 0x2c716b830000b27548fc6097a77d598592b51faf67e034f69a47c380fc4d1f3b
10. 0xe8ce6526203eeff278621cde08607876fd3c33b3d5f8f0c68cd3d71fb0fdc142
11. 0xe34b4862878cc4926f0e4b84b3f031ef1f0cf0de9bf8fb3c13adbc6abc010ee1
12. 0xb0cc0b4ce5a68e83d3e3e55b0387f828adf6f5eb6cfa666d75f6e16ed9d89c1f
13. 0x746e9e5b6765727b6b96f41204cc115b0302259f6c67be0cf0efbf245601d500
14. 0x614d844c9e0509d9f9e63697aa2935555bce5f13695a8dc0047aa9e9898d70b3
15. 0x95657a7d540ed6cac0bde9995782333b2562a9a6641853269ac95148827410f0
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae