Evidence row 566397

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Get the full howto/v2 contract for one page by slug (from list_howto_pages /  search_howto_pages): intro, per-step teach/intent/code, divergence notes, cross-tool links, and grounding.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "slug": {
            "description": "How-to page slug, e.g. flight-risk-predict-which-employees-will-resign-in-excel.",
            "type": "string"
          }
        },
        "required": [
          "slug"
        ],
        "type": "object"
      },
      "name": "get_howto_page"
    },
    {
      "description": "List the analysis families on stepcode.dev (e.g. flight-risk, diversity-index-EBIT-impact) with the tools each is shown in and how many pages exist for it.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "list_analysis_families"
    },
    {
      "description": "List every published how-to page on stepcode.dev — 36 analysis x tool cells (Excel, Google Sheets, R, Python, SQL, DAX/Power BI) with slug, title, analysis family, tool, vertical and whether the tool's approach diverges from the others.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "list_howto_pages"
    },
    {
      "description": "Filter the how-to index by analysis family, tool, vertical, and/or a case-insensitive text query against title, analysis name, intro, problem statement, and step operations (with practitioner-synonym coverage, e.g. attrition/turnover/churn, logistic regression/classifier, power bi/dax, diversity/simpson/blau). All filters are optional and combine with AND; call with no arguments to get every page (same as list_howto_pages).",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "analysisSlug": {
            "description": "Analysis family slug, e.g. flight-risk-predict-which-employees-will-resign.",
            "type": "string"
          },
          "query": {
            "description": "Case-insensitive text query against title, analysis name, intro, problem statement, and step operations.",
            "type": "string"
          },
          "tool": {
            "description": "Tool slug, e.g. excel, sheets, r, python, sql, dax.",
            "type": "string"
          },
          "vertical": {
            "description": "Vertical slug, e.g. hr.",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "search_howto_pages"
    }
  ]
}

What the leaf hashes

{"body":"ffd2200d44ed0df307c0888f2901cfed7e951ad5c7bc69ef3e8ef7048b6ca6ae","id":566397,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793138436252878,"prev":null,"subject":"98e2ce53-8991-4180-9886-cfb4f2f1b7ec","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0x228067042f850f8ca33d69bf2b692164243999d5511ce3ae3114f6eb7fbc009a
2. 0x26b245a81e38ce966f745465fcb0dd83359e7c0b2c2bce7cae8ca37bb87633bf
3. 0x8310964412415fe7e1e3cce9db45f370ce34b218418a975a4b29459940ca0235
4. 0x49760b5a4388e9105c6eb84a0f37526fdefb092339253b3cf5031f7257d12f11
5. 0x027abd49d795cbdc0f43e182832a6d374758e75ce87d8544fe5f2f86184b5183
6. 0xae4bb316635243407bb94235e2dbbb11dd14272f49f5da19e5a6dd1a31c7bc6c
7. 0xac57c23a78592a6649eaac2649f84a51ce6e85880f36f8fa77808cd10f86d974
8. 0x999cf5e1e0a8174b5eeabc127a31aa464691cc08874d1ba591413cca0dbb7b0e
9. 0xfbf489a36b20bb27e6ae530c89571251371c05e8e580a6da0a43994a9403a402
10. 0x891e6ce8c6c016beacc0ffb48444357c20be252a928f00e6910e4624459772e8
11. 0x145efa9439193d1e56a45e8d993e421cff3f9f7052266fda13244e7e739552e9
12. 0x3e618f03ac19ac846329a4673ab8d8561b083fca3c7f9a5fd8bd3bbee6556c25
13. 0x20ca24353b8aca3e061eedf55f49b69ae8369b88135dfdabf30039ed34db329a
14. 0xe8ee6f6ed50253c5ee2d1aa85a4b1a38ce94bca7f3b72fd1850f496152dbe285
15. 0xa383a1cfe9b3f6af67eb4c7642564b9424d46d7fca90e7ba175d549f8b67dd0c
16. 0x52efa60e0c3d8525486d2310eb3b6b566c9677c64fd1f819edb072cf101bcbdb
17. 0x22c1fb9487ee0b9732fa017a0cc321eb27a60c08450d112f755089796e12cb1c
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4