Evidence row 3986112

What was observed

{
  "count": 5,
  "tools": [
    {
      "description": "Accessibility requirements for an interactive component or screen that is about to be designed or built: menus, dialogs, carousels, tabs, forms, drag and drop, custom controls, cards, tables, charts, animation, and the wireframes, mockups and prototypes for them. Takes the request in the user’s own words and returns the guides that apply with the requirements to build in from the start (keys, roles and names, focus, what is announced), working reference code, and the checks split into what an agent can confirm and what a person must. When the request itself breaks a rule (autoplay with no pause, a placeholder as the only label, a div as a button, hover-only menus, removed focus outlines, disabled zoom), it also returns a version that keeps what the user wanted and passes, and one sentence that explains the change.",
      "inputSchema": {
        "properties": {
          "limit": {
            "description": "Guides to return at most (default 6, max 12)",
            "type": "integer"
          },
          "locale": {
            "description": "Language of the answer and the guides: en (default) or ja. English answers cite EN 301 549 and Section 508; Japanese answers cite JIS X 8341-3:2016.",
            "enum": [
              "en",
              "ja"
            ],
            "type": "string"
          },
          "request": {
            "description": "What the user asked for, in their words, e.g. \"autoplaying hero carousel\", \"custom dropdown with search\", \"カード全体をクリックできる一覧\"",
            "maxLength": 1000,
            "type": "string"
          }
        },
        "required": [
          "request"
        ],
        "type": "object"
      },
      "name": "before_building"
    },
    {
      "description": "Checks the contrast of colours, a palette or design tokens for use in a design or in code. Takes colour pairs (foreground and background, with text size in px and weight when the foreground is text, or use: \"non-text\" for control borders, icons and focus rings) or a set of named tokens, in hex, rgb() or hsl(). Returns each pair’s contrast ratio, pass or fail against WCAG 1.4.3 (text) and 1.4.11 (non-text) at AA or AAA, the nearest passing shade of the same hue, and the guides that apply. It checks values, not rendered pages: text over images, real focus states and forced colors stay with the audit.",
      "inputSchema": {
        "properties": {
          "level": {
            "description": "Conformance level to check against (default AA)",
            "enum": [
              "AA",
              "AAA"
            ],
            "type": "string"
          },
          "locale": {
            "description": "Language of the answer and the guides: en (default) or ja. English answers cite EN 301 549 and Section 508; Japanese answers cite JIS X 8341-3:2016.",
            "enum": [
              "en",
              "ja"
            ],
            "type": "string"
          },
          "pairs": {
            "description": "Colour pairs to check",
            "items": {
              "properties": {
                "background": {
                  "description": "What it sits on",
                  "type": "string"
                },
                "foreground": {
                  "description": "Text, icon or border colour: #767676, rgb(118 118 118), hsl(0 0% 46%)",
                  "type": "string"
                },
                "name": {
                  "description": "What the pair is, e.g. \"body text\", \"primary button border\"",
                  "type": "string"
                },
                "size": {
                  "description": "Font size in CSS px, when the foreground is text",
                  "type": "number"
                },
                "use": {
                  "description": "text (default), large-text, or non-text for control boundaries, icons and focus indicators (3:1)",
                  "enum": [
                    "text",
                    "large-text",
                    "non-text"
                  ],
                  "type": "string"
                },
                "weight": {
                  "description": "Font weight (400, 700), when the foreground is text",
                  "type": "number"
                }
              },
              "required": [
                "foreground",
                "background"
              ],
              "type": "object"
            },
            "maxItems": 50,
            "type": "array"
          },
          "tokens": {
            "additionalProperties": {
              "type": "string"
            },
            "description": "Or named tokens { \"ink\": \"#1b1b1b\", \"paper\": \"#fff\" }, up to 12; every combination is checked as text",
            "type": "object"
          }
        },
        "type": "object"
      },
      "name": "check_palette"
    },
    {
      "description": "Searches the Learn guides by words, component name, tag, ARIA attribute or WCAG number (1.4.3, SC 2.1.1, JIS 達成基準, EN 301 549 9.x). Returns for each matching topic: the problem, the fix in one line, how to test it, the guide link, and the criterion in WCAG terms, with EN 301 549 and Section 508 in English or JIS X 8341-3 in Japanese. Topics with no guide yet come back as \"in progress\". For a finding, a complaint, a failing check or a question that names a problem.",
      "inputSchema": {
        "properties": {
          "limit": {
            "description": "Topics to return at most (default 8, max 20)",
            "type": "integer"
          },
          "locale": {
            "description": "Language of the answer and the guides: en (default) or ja. English answers cite EN 301 549 and Section 508; Japanese answers cite JIS X 8341-3:2016.",
            "enum": [
              "en",
              "ja"
            ],
            "type": "string"
          },
          "query": {
            "description": "Words, a tag, an ARIA attribute or a WCAG number",
            "maxLength": 200,
            "type": "string"
          }
        },
        "required": [
          "query"
        ],
        "type": "object"
      },
      "name": "find_fix"
    },
    {
      "description": "The full guide as Markdown, the same guide as easeweb.dev/learn/<slug>.md: what happens, why it fails, who it affects, what automation misses, the Before and After code, how to verify, and the limits. Also returns the After code as plain text with its marks (recommended, not enough on its own, the rule of thumb behind it). Takes a guide slug, as listed in find_fix and before_building results.",
      "inputSchema": {
        "properties": {
          "locale": {
            "description": "Language of the answer and the guides: en (default) or ja. English answers cite EN 301 549 and Section 508; Japanese answers cite JIS X 8341-3:2016.",
            "enum": [
              "en",
              "ja"
            ],
            "type": "string"
          },
          "slug": {
            "description": "The guide slug, e.g. \"native-buttons\"",
            "maxLength": 100,
            "type": "string"
          }
        },
        "required": [
          "slug"
        ],
        "type": "object"
      },
      "name": "get_guide"
    },
    {
      "description": "The test plan for something that has been built or fixed. For a guide (by slug) or a component (by query) returns the pass criteria, the checks an agent can run itself, the checks only a person can do (which keys to press and what should happen, as a two-minute script), the guide’s limits, and a Playwright regression test skeleton. An agent or automation can’t establish the person’s checks.",
      "inputSchema": {
        "properties": {
          "locale": {
            "description": "Language of the answer and the guides: en (default) or ja. English answers cite EN 301 549 and Section 508; Japanese answers cite JIS X 8341-3:2016.",
            "enum": [
              "en",
              "ja"
            ],
            "type": "string"
          },
          "query": {
            "description": "Or a component or problem in words, when the slug is unknown",
            "maxLength": 200,
            "type": "string"
          },
          "slug": {
            "description": "A guide slug from find_fix or before_building",
            "maxLength": 100,
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "test_steps"
    }
  ]
}

What the leaf hashes

{"body":"3490972f37f6dbd688e552524be88885b45c8347c17b3ca9bd802665fa5ce9e3","id":3986112,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1794089713662787,"prev":730234,"subject":"e2627fcc-4ee8-4e77-b095-faaaa5e6e2f2","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-07 (195826 rows).

1. 0x7c88de3a7ca8e0b64517936737a8f3b1789e7dca8d3606ae1e4510431557fe89
2. 0x5c8aaf65308c5061a018b2a294c850167539606114d6477488cc6f2e60179caf
3. 0x99eefd1f31efd715b27135e678d7f0c09a6abbb12ca6f4d0aa2de12c9cd26d10
4. 0x5ebcf4b554a2faa88cdf3ba3042ca0362634924b61661aee84993d1ea2091695
5. 0x33412bfc8707fa71ecab40b0f2947009f06d0818b36a4cf210954f5cf05d0225
6. 0x35092367403d4a25dda70ef633ee20a224c7927018aaa10c9607537d980d977f
7. 0x44ee809a8f0e532f28be4fbf19395af44ec1c807a6d34ea9c81d3f731118db52
8. 0xebae29e5e52b0ecab54f7aee84a0ff8893757884416b9f675c54e63b4db1c90d
9. 0x5685383388851bf1a402f574c1d08b4866b266c9a4bea1e8cc9e107c67d6e610
10. 0x7518ea42071a0dc7aa0bef871ff329891fecd907330f2c0c282b9335bc36fa42
11. 0x9492bc29c014a0cc4db12f590be32a19c639bde31f0bb4d99aa33c88646bdc50
12. 0x5c65af7f5af10206168fa6d142ed80310c50c91050e9f686f8e0d302493f5b74
13. 0xdb8937d5e94ce631726ca4d5174d465ef8d90afa09be74c6c17febce89e84dad
14. 0xc9930015910e15b4a3ee7fa6677b93ccee48576a50ff5a3514be8ce187946e8f
15. 0xdda41bf8f8b807884588170276b0203d24918e4a5c47ba7f4d5d0217f85e0cf7
16. 0x9108c80d13a11b7549b554924410a7c5d215a2cd03aee9659ca627cb099f1a2e
17. 0x3b69f6d98c91b21287021db092e52491474f0d08438393ac130d6a3c273bcd4a
18. 0xff23fa8a9de3f957315ef0dfe7e8d8f6b1a51dae05fef7615c59794e019ff05c

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa