Evidence row 291279

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Audit existing chart colors for accessibility: pairwise OKLab separation under normal vision, deuteranopia, protanopia, tritanopia and achromatopsia, plus WCAG 2.2 non-text contrast (3:1) of every color against the chart background. Returns a pass / warn / fail verdict with the numbers behind it. Set ramp=true for sequential or diverging scales, whose steps are meant to be close.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "background": {
            "default": "#ffffff",
            "description": "Chart background color",
            "type": "string"
          },
          "colors": {
            "description": "Palette colors in slot order (CSS syntax)",
            "items": {
              "type": "string"
            },
            "maxItems": 24,
            "minItems": 1,
            "type": "array"
          },
          "ramp": {
            "default": false,
            "description": "true for a sequential or diverging scale (skips pairwise separation)",
            "type": "boolean"
          }
        },
        "required": [
          "colors"
        ],
        "type": "object"
      },
      "name": "audit_palette"
    },
    {
      "description": "Build an evenly spaced perceptual (OKLab) color scale: sequential from start to end, or diverging from start through mid to end. Returns the steps and a background-contrast audit (pairwise separation is not judged for ramps).",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "background": {
            "default": "#ffffff",
            "type": "string"
          },
          "end": {
            "description": "Last color (or the positive end)",
            "type": "string"
          },
          "kind": {
            "enum": [
              "sequential",
              "diverging"
            ],
            "type": "string"
          },
          "mid": {
            "description": "Middle color for a diverging scale; default a neutral near the background",
            "type": "string"
          },
          "start": {
            "description": "First color (or the negative end of a diverging scale)",
            "type": "string"
          },
          "steps": {
            "default": 7,
            "maximum": 24,
            "minimum": 3,
            "type": "integer"
          }
        },
        "required": [
          "kind",
          "start",
          "end"
        ],
        "type": "object"
      },
      "name": "build_ramp"
    },
    {
      "description": "Show what each color looks like to readers with deuteranopia, protanopia, tritanopia or achromatopsia (published Machado 2009 matrices), so an assistant can describe or render the palette as a colorblind reader sees it.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "colors": {
            "description": "Colors in slot order (CSS syntax)",
            "items": {
              "type": "string"
            },
            "maxItems": 24,
            "minItems": 1,
            "type": "array"
          },
          "modes": {
            "description": "Vision modes to simulate; default all",
            "items": {
              "enum": [
                "normal",
                "deutan",
                "protan",
                "tritan",
                "achromatopsia"
              ],
              "type": "string"
            },
            "type": "array"
          }
        },
        "required": [
          "colors"
        ],
        "type": "object"
      },
      "name": "simulate_palette"
    },
    {
      "description": "Generate a categorical chart palette of n colors (1-12) that maximizes perceptual separation under normal vision and colorblindness, with the given brand colors locked as anchors in slot order. Returns the palette, the worst pair distances, the engine's relaxation notes, a full accessibility audit against the background, and a link to open it in the app. Honest cap is 6 slots; above that the result says so.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "anchors": {
            "default": [],
            "description": "Brand or required colors, kept exactly, in slot order (CSS syntax)",
            "items": {
              "type": "string"
            },
            "maxItems": 12,
            "type": "array"
          },
          "background": {
            "default": "#ffffff",
            "description": "Chart background color",
            "type": "string"
          },
          "grid": {
            "description": "Gridline color; defaults to a light or dark gray to match the background",
            "type": "string"
          },
          "n": {
            "default": 6,
            "description": "Number of categorical slots",
            "maximum": 12,
            "minimum": 1,
            "type": "integer"
          },
          "posture": {
            "default": "comparative",
            "description": "kpi: few strong colors; comparative: balanced; exploratory: many muted",
            "enum": [
              "kpi",
              "comparative",
              "exploratory"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "solve_palette"
    }
  ]
}

What the leaf hashes

{"body":"b2d09f676e0fe2df59ff30d17a3eb825f1d59f5346ea100051e781e0f0bba864","id":291279,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793047976224573,"prev":null,"subject":"a2a08d6d-db42-4fa7-865d-3945ce0700a9","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. 0x7e241f758f1eb8c5c5e253db029b1be26be06cb95bfc445035533208515e5c65
2. 0x87d9077a0cc8afe1faf18802caec9a54de79f7b870d9f8bc5ca4e1ae2e6b8128
3. 0xf4f497bf2fee8b113b83119c626ab48dba90953b55d138e491d2d69348ca0261
4. 0x3709dcfe5f97fd0bf334c613c180e2b59d2c541969bcadfe053fa4b4ce2b4c91
5. 0x234a39e3e3ffde23c4d21da1e002c922ee84ffa49f67867330bfb0bd73805d67
6. 0x388184b867a1697881d09721d58af63387994c734fa3cbb3268709c830dc9326
7. 0x57633a9875d6b523baf2c83008c9b2ab9f5ad3082cb1f9e01460e54b1e1f6eac
8. 0xd58040d5117d7fddcb957d2bd892a67cf61d8d1e625498c288e9a71002830105
9. 0x5dfe7ef8c83bbb998c208ea7d7d89ff8b783da931ec5ae5dae5ebce0c67f2787
10. 0x2718d6dca57166b1f1fa238e8a139e4cdbab7b7485a09970fff985d3b3878bfd
11. 0xaf10e841089e5989890dc77ffce42a46564d25ef15f30d1e35bf53a495483ad4
12. 0xab729e4203b650f2a3c15efd6fd44eb2482232373bc1de662fd9d496869eb2d3
13. 0x0bffb634300aa5609bddaa79e8d31d7cde36c0a5a4465472f809b9f5287e40d2
14. 0x7721d38652b6444b18e1193824e50490ade04851ce6221771f6e374c4527d80f
15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae