Web Evidence

Verify claim

verify_claim

Standard verification with balanced evidence coverage. Costs $0.05 USDC on Base per call.

Input Schema

TableJSON Schema

Name	Required	Description
`asOf`	No	Optional YYYY-MM-DD date at which the claim should be evaluated.
`claim`	Yes	The factual claim to verify.
`language`	No	Preferred response language or auto for automatic selection. Defaults to auto.
`maxSources`	No	Maximum number of evidence sources to return, capped by the selected verification tier.
`jurisdiction`	No	Optional country, state, or legal jurisdiction that should frame the verification.
`sourcePolicy`	No	Source selection policy. Defaults to authoritative; official_only requires allowedDomains.
`allowedDomains`	No	Optional hostname allowlist without schemes or paths, for example openai.com.
`blockedDomains`	No	Optional hostname blocklist without schemes or paths.
`freshnessHours`	No	Maximum preferred source age in hours. Defaults to 168 hours.
`minimumSources`	No	Minimum number of sources requested. Defaults to 2 and cannot exceed maxSources.
`includeConflicts`	No	Whether to search for and report conflicting evidence. Defaults to true.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`claim`	Yes
`status`	Yes
`commerce`	Yes
`evidence`	Yes
`conflicts`	Yes
`snapshots`	Yes
`conclusion`	Yes
`observedAt`	Yes
`provenance`	Yes
`atomicFacts`	Yes
`limitations`	Yes
`verificationId`	Yes
`providerSources`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed10 schema fields changedOct 3, 2026

addedInput schema / properties / allowedDomains / description

Added value: +"Optional hostname allowlist without schemes or paths, for example openai.com."

addedInput schema / properties / blockedDomains / description

Added value: +"Optional hostname blocklist without schemes or paths."

addedInput schema / properties / freshnessHours / description

Added value: +"Maximum preferred source age in hours. Defaults to 168 hours."

addedInput schema / properties / includeConflicts / description

Added value: +"Whether to search for and report conflicting evidence. Defaults to true."

addedInput schema / properties / jurisdiction / description

Added value: +"Optional country, state, or legal jurisdiction that should frame the verification."

addedInput schema / properties / language / description

Added value: +"Preferred response language or auto for automatic selection. Defaults to auto."

addedInput schema / properties / maxSources / description

Added value: +"Maximum number of evidence sources to return, capped by the selected verification tier."

addedInput schema / properties / minimumSources / description

Added value: +"Minimum number of sources requested. Defaults to 2 and cannot exceed maxSources."

addedInput schema / properties / sourcePolicy / description

Added value: +"Source selection policy. Defaults to authoritative; official_only requires allowedDomains."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "atomicFacts": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "confidence": {
+            "maximum": 1,
+            "minimum": 0,
+            "type": "number"
+          },
+          "evidenceIds": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "explanation": {
+            "type": "string"
+          },
+          "statement": {
+            "type": "string"
+          },
+          "status": {
+            "enum": [
+              "confirmed",
+              "partially_confirmed",
+              "contradicted",
+              "insufficient_evidence",
+              "ambiguous"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "statement",
+          "status",
+          "confidence",
+          "explanation",
+          "evidenceIds"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "claim": {
+      "type": "string"
+    },
+    "commerce": {
+      "additionalProperties": false,
+      "properties": {
+        "orderId": {
+          "type": "string"
+        },
+        "orderToken": {
+          "type": "string"
+        },
+        "orderUrl": {
+          "format": "uri",
+          "type": "string"
+        },
+        "receiptId": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "required": [
+        "orderId",
+        "orderToken",
+        "receiptId",
+        "orderUrl"
+      ],
+      "type": "object"
+    },
+    "conclusion": {
+      "type": "string"
+    },
+    "conflicts": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "evidenceIds": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "summary": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "summary",
+          "evidenceIds"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "evidence": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "cited": {
+            "type": "boolean"
+          },
+          "consulted": {
+            "type": "boolean"
+          },
+          "excerpt": {
+            "type": "string"
+          },
+          "id": {
+            "type": "string"
+          },
+          "providerSourceMatched": {
+            "type": "boolean"
+          },
+          "publishedAt": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "publisher": {
+            "type": "string"
+          },
+          "qualityReason": {
+            "type": "string"
+          },
+          "relationship": {
+            "enum": [
+              "supports",
+              "contradicts",
+              "context"
+            ],
+            "type": "string"
+          },
+          "retrievedAt": {
+            "format": "date-time",
+            "type": "string"
+          },
+          "snapshotId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "snapshotted": {
+            "type": "boolean"
+          },
+          "sourceType": {
+            "type": "string"
+          },
+          "title": {
+            "type": "string"
+          },
+          "url": {
+            "format": "uri",
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "url",
+          "title",
+          "publisher",
+          "publishedAt",
+          "retrievedAt",
+          "excerpt",
+          "relationship",
+          "sourceType",
+          "qualityReason",
+          "providerSourceMatched",
+          "cited",
+          "snapshotId",
+          "consulted",
+          "snapshotted"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "limitations": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "observedAt": {
+      "format": "date-time",
+      "type": "string"
+    },
+    "provenance": {
+      "additionalProperties": false,
+      "properties": {
+        "cacheHit": {
+          "type": "boolean"
+        },
+        "cachedInputTokens": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "citedSourceCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "consultedSourceCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "inputTokens": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "matchedEvidenceCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "model": {
+          "type": "string"
+        },
+        "outputTokens": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "provider": {
+          "type": "string"
+        },
+        "providerResponseId": {
+          "type": "string"
+        },
+        "providerSourceCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "searchedWeb": {
+          "type": "boolean"
+        },
+        "snapshottedSourceCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "webSearchCallCount": {
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "provider",
+        "model",
+        "providerResponseId",
+        "searchedWeb",
+        "consultedSourceCount",
+        "citedSourceCount",
+        "providerSourceCount",
+        "matchedEvidenceCount",
+        "snapshottedSourceCount",
+        "webSearchCallCount",
+        "inputTokens",
+        "cachedInputTokens",
+        "outputTokens",
+        "cacheHit"
+      ],
+      "type": "object"
+    },
+    "providerSources": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "actions": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "cited": {
+            "type": "boolean"
+          },
+          "evidenceIds": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "provider": {
+            "type": "string"
+          },
+          "queries": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "searchCallIds": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "snapshotId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "sourceId": {
+            "type": "string"
+          },
+          "title": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "url": {
+            "format": "uri",
+            "type": "string"
+          }
+        },
+        "required": [
+          "sourceId",
+          "url",
+          "title",
+          "provider",
+          "searchCallIds",
+          "actions",
+          "queries",
+          "evidenceIds",
+          "cited",
+          "snapshotId"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "snapshots": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "contentLength": {
+            "anyOf": [
+              {
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "contentType": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "failureReason": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "finalUrl": {
+            "anyOf": [
+              {
+                "format": "uri",
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "httpStatus": {
+            "anyOf": [
+              {
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "normalizedSha256": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "rawSha256": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "requestedUrl": {
+            "format": "uri",
+            "type": "string"
+          },
+          "retrievedAt": {
+            "format": "date-time",
+            "type": "string"
+          },
+          "snapshotId": {
+            "type": "string"
+          },
+          "status": {
+            "enum": [
+              "captured",
+              "failed",
+              "blocked",
+              "too_large",
+              "unsupported"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "snapshotId",
+          "requestedUrl",
+          "finalUrl",
+          "retrievedAt",
+          "status",
+          "httpStatus",
+          "contentType",
+          "contentLength",
+          "rawSha256",
+          "normalizedSha256",
+          "failureReason"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "status": {
+      "enum": [
+        "confirmed",
+        "partially_confirmed",
+        "contradicted",
+        "insufficient_evidence",
+        "ambiguous"
+      ],
+      "type": "string"
+    },
+    "verificationId": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "verificationId",
+    "claim",
+    "status",
+    "observedAt",
+    "conclusion",
+    "atomicFacts",
+    "providerSources",
+    "evidence",
+    "snapshots",
+    "conflicts",
+    "limitations",
+    "provenance",
+    "commerce"
+  ],
+  "type": "object"
+}

First observedSep 30, 2026

TDQS

B3/5.0

Behavior3/5

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

Annotations declare openWorldHint=true, destructiveHint=false, idempotentHint=false, and readOnlyHint=false. The description adds useful behavioral context with the per-call cost ($0.05 USDC on Base), but omits operational details such as payment flow, rate limits, or what 'balanced evidence coverage' concretely means.

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

Conciseness5/5

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

Two short sentences front-load the verification tier and cost with no wasted words or repetition. Every sentence earns its place.

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

Completeness3/5

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

Output schema and full parameter descriptions mean return values and parameter details need not be repeated. However, with four sibling verification tiers, the description should clarify when to choose standard verification over the alternatives; that routing information is absent.

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% across 11 parameters, so the schema already documents all parameter meanings. The description adds no parameter-level semantics beyond what the input schema provides, making the baseline 3 appropriate.

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 name and title state 'Verify claim', but the description only says 'Standard verification with balanced evidence coverage' plus a cost. It identifies the standard tier but does not explicitly state the resource being verified or differentiate from sibling tiers like quick, deep, or research.

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?

No when-to-use or when-not guidance is provided. Despite four sibling verification tools, the description does not mention alternatives or explain when standard verification is preferable to quick, deep, or research tiers.

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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