vealth

Check whether a file was anchored, and when

verify_anchor

Read-onlyIdempotent

Given the SHA-256 of a file, say whether it is anchored, when, and return the merkle proof plus the transaction so the caller can check it independently without trusting Vealth. Use it to confirm someone held a document when they claim they did, or to confirm your own submission landed. Free and keyless. Cost and signer: free and keyless, nothing to sign.

Input Schema

Name	Required	Description	Default
`sha256`	Yes	SHA-256 of the file, 64 lowercase hex characters.

Output Schema

Name	Required	Description	Default
`ok`	No
`tool`	No
`funded`	No
`payUsd`	No
`workId`	No
`claimId`	No
`claimable`	No
`next_call`	No
`proofRule`	No
`fulfillableBy`	No
`definitionOfDone`	No
`needs_from_caller`	No
`notClaimableReason`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedAug 26, 2026
- addedOutput schema / properties / claimable
```
Added value: +{
+  "type": "boolean"
+}
```
- addedOutput schema / properties / notClaimableReason
```
Added value: +{
+  "type": "string"
+}
```

Changed1 schema field changedAug 18, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "claimId": {
+      "type": "string"
+    },
+    "definitionOfDone": {
+      "type": [
+        "object",
+        "array",
+        "string",
+        "null"
+      ]
+    },
+    "fulfillableBy": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "funded": {
+      "type": "boolean"
+    },
+    "needs_from_caller": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "next_call": {
+      "type": "object"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "payUsd": {
+      "type": "number"
+    },
+    "proofRule": {
+      "type": "string"
+    },
+    "tool": {
+      "type": "string"
+    },
+    "workId": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

First observedAug 2, 2026

TDQS

A3.8/5.0

Behavior4/5

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

Annotations already declare readOnly/idempotent/non-destructive/openWorld, so the safety profile is covered. The description adds genuinely useful context beyond that: the proof is independently verifiable without trusting the operator, and the call is free and keyless with nothing to sign. The cost/signer point is, however, stated twice in the same sentence, diluting the value.

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

Conciseness3/5

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

The core purpose and return payload are front-loaded and efficient. The closing 'Free and keyless. Cost and signer: free and keyless, nothing to sign.' is a redundant restatement within two sentences, which is sloppy structure rather than harmful, but it costs a point.

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

Completeness4/5

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

An output schema exists, so return values need no further explanation, and annotations carry the safety profile. The description covers purpose, trust model, cost, and use cases adequately; only the relationship to anchor_proof is unaddressed.

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 coverage is 100% and the single parameter's format (64 lowercase hex characters) is documented in the schema itself. The description only restates that it takes a file's SHA-256, adding no semantics beyond the structured field, so baseline 3 applies.

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

Purpose4/5

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

States a concrete verb+resource: given a SHA-256, report whether the file is anchored, when, and return the merkle proof and transaction. That is far more specific than the title alone. It does not explicitly differentiate itself from the conceptually adjacent sibling anchor_proof, leaving the agent to infer which one to call.

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

Usage Guidelines4/5

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

Gives two clear usage scenarios: verifying a third party's claim about holding a document at a time, and confirming your own submission landed. No explicit when-not conditions or sibling alternatives are named, so it stops short of full routing guidance.

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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