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ChainHelix for Machines

by io.chainhelix.mcp
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attest

Any claim sealed on chain now and revealed later, a track record nobody can backdate. Send your claim as the payload string with an optional revealDelayHours from 1 to 720, default 72. Your identity is your paying wallet, or your key id. ChainHelix seals the exact time of your commitment on the opBNB chain; the claim text and salt publish automatically at reveal time. This attests WHEN you said it, never whether it is true. Verification spec: the free attest_spec tool. Price: 5 cents per call. A ChainHelix API key does not cover this tool.

Input Schema

NameRequiredDescriptionDefault
payloadYesThe claim text, 1 to 2048 characters. Example: BTC above 70000 USD at 2026-11-01T00:00Z
revealDelayHoursNoHours from the seal to the publication of the claim text and salt, whole number 1 to 720, default 72. Example: 24

Output Schema

NameRequiredDescriptionDefault
seqNo
hashNo
noteNo
errorNo
statusNo
tenantNo
revealAtNo
committedAtNo
revealDelayHoursNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / payload / description
      Added value: +"The claim text, 1 to 2048 characters. Example: BTC above 70000 USD at 2026-11-01T00:00Z"
    • addedInput schema / properties / revealDelayHours / description
      Added value: +"Hours from the seal to the publication of the claim text and salt, whole number 1 to 720, default 72. Example: 24"
  2. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"670f7504e3de5031beccee25a2d24e4515f68b893295f6d5b0d3a0665498b2c9"New value: +"25cc80db6d8e9eac73d47a50f7ad6333a21f1972d008a8fed0159de8bfb4b519"
  3. Changed2 schema fields changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"e5b4290024a229f2bdf97f8fc6a0079c3fe13b77267f41fdcffeb8b26aa1c41e"New value: +"670f7504e3de5031beccee25a2d24e4515f68b893295f6d5b0d3a0665498b2c9"
    • changedInput schema / x-lexicon / version
      Previous value: -"0.1.0"New value: +"0.2.0"
  4. Changed2 schema fields changed
    • addedInput schema / additionalProperties
      Added value: +false
    • removedOutput schema / properties / receipt
      Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "bytes": {
-      "type": "number"
-    },
-    "covers": {
-      "type": "string"
-    },
-    "issuedAt": {
-      "type": "number"
-    },
-    "lookup": {
-      "type": "string"
-    },
-    "network": {
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "nonce": {
-      "type": "string"
-    },
-    "seq": {
-      "type": "number"
-    },
-    "settleTx": {
-      "type": [
-        "string",
-        "null"
-      ]
-    },
-    "sha256": {
-      "type": "string"
-    },
-    "tool": {
-      "type": [
-        "string",
-        "null"
-      ]
-    }
-  },
-  "type": "object"
-}
  5. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"New value: +"e5b4290024a229f2bdf97f8fc6a0079c3fe13b77267f41fdcffeb8b26aa1c41e"
  6. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"New value: +"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"
  7. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4"New value: +"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"
  8. Changed3 schema fields changed
    • addedInput schema / x-aliases
      Added value: +{
+  "payload": [
+    "Payload",
+    "payloads"
+  ]
+}
    • addedInput schema / x-lexicon
      Added value: +{
+  "bundleSha256": "c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4",
+  "name": "ChainHelix Agentic Lexicon",
+  "resolve": "lexicon_resolve",
+  "spec": "lexicon_spec",
+  "version": "0.1.0"
+}
    • addedInput schema / x-vocab
      Added value: +{
+  "payload": "agent.payload",
+  "revealDelayHours": "agent.revealDelayHours"
+}
  9. Changed1 schema field changed
    • addedOutput schema / properties / receipt
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "bytes": {
+      "type": "number"
+    },
+    "covers": {
+      "type": "string"
+    },
+    "issuedAt": {
+      "type": "number"
+    },
+    "lookup": {
+      "type": "string"
+    },
+    "network": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "nonce": {
+      "type": "string"
+    },
+    "seq": {
+      "type": "number"
+    },
+    "settleTx": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "sha256": {
+      "type": "string"
+    },
+    "tool": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}
  10. First observed

TDQS

A4.2/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Beyond the annotations, the description discloses critical behavior: the claim is sealed on opBNB, the exact commitment time is recorded, claim text and salt publish automatically at reveal, the attestation proves timing but not truth, and the tool costs 5 cents per call and is not covered by an API key. These details substantially exceed the structured annotations and do not contradict them.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is front-loaded with the core sealing concept and then covers parameters, identity, mechanics, caveats, verification, and pricing. It is reasonably sized for a paid on-chain mutation tool, though the opening phrasing is slightly marketing-like rather than purely operational.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity, the description covers what it does, how to call it, who the identity is, what is published at reveal, what it does not prove, cost, API-key limitation, and where to find the verification spec. An output schema exists, so return-value details are not required in the description.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents both parameters, including ranges and defaults. The description repeats the payload and revealDelayHours semantics but adds no meaningful format or constraint beyond the schema, making baseline 3 appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific action and resource: sealing a claim commitment on the opBNB chain and revealing it later. It also distinguishes the tool from attest_spec by pointing to that sibling for verification. An agent can tell this is the create/attest operation rather than a status or list operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives clear implied usage by explaining what to send and when a claim gets revealed, and it points to attest_spec for verification. However, it does not explicitly say when to use this tool versus attest_status, list_attestations, or list_reveals, so sibling routing remains mostly implicit.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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