R/IV — Verify Claims, Citations & Agent Actions

source.snapshot

R/IV source.snapshot — independent evidence-verification primitive for provenance. Completed paid execution returns an RVO plus signed R/IV Verification Receipt.

Input Schema

Name	Required	Description	Default
`url`	Yes
`purpose`	No
`request_id`	Yes	Caller-generated idempotency key for this paid execution attempt.
`capture_scope`	No		text

Output Schema

Name	Required	Description
`cost`	Yes
`jobId`	Yes
`result`	Yes	R/IV Verification Object with evidence, limitations, verdict and resultHash.
`status`	Yes
`receipt`	Yes
`verdict`	Yes
`requestId`	Yes
`timestamps`	Yes
`operationId`	Yes
`schemaVersion`	Yes
`operationVersion`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$id": "https://rdiv-production-runtime-production.up.railway.app/schemas/riv-machine-result-v2.json",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": true,
+  "description": "Schema of a completed R/IV machine execution. Cryptographic receipt integrity does not independently establish the truth of any underlying conclusion. Free trials may use a separate contract.",
+  "properties": {
+    "cost": {
+      "additionalProperties": true,
+      "properties": {
+        "amount": {
+          "minimum": 0,
+          "type": "number"
+        },
+        "currency": {
+          "const": "USD"
+        }
+      },
+      "required": [
+        "currency",
+        "amount"
+      ],
+      "type": "object"
+    },
+    "jobId": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "operationId": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "operationVersion": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "receipt": {
+      "additionalProperties": true,
+      "properties": {
+        "issuedAt": {
+          "format": "date-time",
+          "type": "string"
+        },
+        "jobId": {
+          "type": "string"
+        },
+        "operationId": {
+          "type": "string"
+        },
+        "receiptId": {
+          "type": "string"
+        },
+        "receiptVersion": {
+          "type": "string"
+        },
+        "requestId": {
+          "type": "string"
+        },
+        "resultHash": {
+          "pattern": "^[a-f0-9]{64}$",
+          "type": "string"
+        },
+        "sha256": {
+          "pattern": "^[a-f0-9]{64}$",
+          "type": "string"
+        },
+        "signature": {
+          "pattern": "^[a-f0-9]{64}$",
+          "type": "string"
+        }
+      },
+      "required": [
+        "receiptVersion",
+        "receiptId",
+        "jobId",
+        "requestId",
+        "operationId",
+        "resultHash",
+        "issuedAt",
+        "sha256",
+        "signature"
+      ],
+      "type": "object"
+    },
+    "requestId": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "result": {
+      "additionalProperties": true,
+      "description": "R/IV Verification Object with evidence, limitations, verdict and resultHash.",
+      "properties": {
+        "limitations": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "operationId": {
+          "type": "string"
+        },
+        "resultHash": {
+          "pattern": "^[a-f0-9]{64}$",
+          "type": "string"
+        },
+        "verdict": {
+          "type": "string"
+        },
+        "verificationId": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "operationId",
+        "verificationId",
+        "verdict",
+        "limitations",
+        "resultHash"
+      ],
+      "type": "object"
+    },
+    "schemaVersion": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "status": {
+      "const": "COMPLETED"
+    },
+    "timestamps": {
+      "additionalProperties": true,
+      "properties": {
+        "completedAt": {
+          "format": "date-time",
+          "type": "string"
+        }
+      },
+      "required": [
+        "completedAt"
+      ],
+      "type": "object"
+    },
+    "verdict": {
+      "minLength": 1,
+      "type": "string"
+    }
+  },
+  "required": [
+    "schemaVersion",
+    "requestId",
+    "jobId",
+    "operationId",
+    "operationVersion",
+    "status",
+    "verdict",
+    "result",
+    "receipt",
+    "cost",
+    "timestamps"
+  ],
+  "title": "R/IV Machine Verification Result v2 - authenticated paid execution",
+  "type": "object",
+  "x-riv-receipt-policy": {
+    "integrity": "server-side HMAC verification required for v1 receipts",
+    "meaning": "signed provenance and execution integrity; not evidence that an underlying claim is true"
+  },
+  "x-riv-status": "public-contract-v2-live-machine-completed-only"
+}

Changed3 schema fields changedOct 8, 2026

addedInput schema / additionalProperties
```
Added value: +false
```

addedInput schema / properties

Added value: +{
+  "capture_scope": {
+    "default": "text",
+    "enum": [
+      "metadata",
+      "text",
+      "full_public_record"
+    ]
+  },
+  "purpose": {
+    "maxLength": 5000,
+    "type": "string"
+  },
+  "request_id": {
+    "description": "Caller-generated idempotency key for this paid execution attempt.",
+    "maxLength": 200,
+    "minLength": 8,
+    "type": "string"
+  },
+  "url": {
+    "format": "uri",
+    "type": "string"
+  }
+}

addedInput schema / required

Added value: +[
+  "url",
+  "request_id"
+]

First observedOct 6, 2026

TDQS

C2.6/5.0

Behavior3/5

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

No annotations exist, so the description carries the full burden. It does disclose meaningful behavior — that this is a paid execution and that completion yields a signed Verification Receipt — which is real context beyond structured fields. However it says nothing about permissions, side effects, or the idempotency behavior implied by request_id.

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?

Two sentences with no wasted filler and the tool name is front-loaded, which is good. But the heavy acronym load (R/IV, RVO) reduces scannability and the brevity comes at the cost of clarity rather than through efficiency.

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

Completeness2/5

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 not be described. But with no annotations, 25% parameter coverage, and a cryptic two-sentence description, key information an agent needs — what the tool captures, when to choose it over source.verify, and what capture_scope controls — is missing.

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

Parameters2/5

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

Schema description coverage is only 25% (only request_id is documented), so the description must compensate for url, purpose, and capture_scope. It adds no parameter meaning at all — notably the capture_scope enum with its 'metadata/text/full_public_record' choices is left completely unexplained.

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

Purpose3/5

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

The description states a purpose ('independent evidence-verification primitive for provenance') and names the artifact produced, which is more than a tautology. But the operation is expressed in opaque jargon (R/IV, RVO) and it never clarifies what 'snapshot' actually does, nor distinguishes it from the close sibling source.verify. Purpose is present but vague.

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

Usage Guidelines2/5

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

There is no when-to-use guidance, no prerequisites, and no mention of alternatives such as source.verify or provenance.receipt. The agent is left to infer entirely when this tool applies versus its many verification siblings.

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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