Web Evidence

Verify claim (quick)

verify_claim_quick

Quick verification for a narrow claim using up to 3 cited sources. Costs $0.02 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

A3.8/5.0

Behavior4/5

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

Annotations already disclose openWorldHint=true, idempotentHint=false, and destructiveHint=false. The description adds meaningful new context not in the structured fields: a per-call cost of $0.02 USDC on Base and a hard source cap of 3, which together explain why repeated calls are not free and reinforce the non-idempotent hint.

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, zero filler. It front-loads the tier scope and then the cost, which is the most decision-relevant fact for a paid tool.

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-value explanation is unnecessary, and the description covers scope and cost. The main remaining gap is that it does not explicitly route the agent among the four verification siblings, which is the highest-value omission for this family.

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 all 11 parameters are already documented and the baseline is 3. The description's 'up to 3 cited sources' loosely ties to maxSources/minimumSources but adds no syntax, defaults, or interaction semantics beyond what the schema states.

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 specific verb (verify) and resource (a claim), and adds scope qualifiers ('quick', 'narrow claim', 'up to 3 cited sources') that hint at the difference from verify_claim, verify_claim_deep, and verify_claim_research. It stops short of naming those siblings or drawing the boundary explicitly, so the agent must infer the tiering.

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 phrase 'narrow claim' plus the 'up to 3 sources' cap implies this tier is for small, simple claims, which is a usable heuristic. However, there is no explicit statement of when to prefer this over verify_claim or verify_claim_deep, and no exclusions are given.

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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