Web Evidence

Verify claim (research)

verify_claim_research

Research-grade verification with the largest search and evidence budget. Costs $0.25 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 declare readOnlyHint=false, idempotentHint=false, openWorldHint=true, so the agent already knows this is a non-idempotent, world-reaching operation. The description adds genuinely new context beyond that: a concrete per-call price of $0.25 USDC on Base, which tells the agent this has real monetary cost and that repeat calls are billable. It stops short of stating latency, rate limits, or payment/auth mechanics.

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 with zero filler, and the tier-defining capability is front-loaded before the cost disclosure. Nothing repeats the name or title verbatim.

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 explanation, and annotations cover the safety/idempotency profile. For a tool with only one required parameter the description is largely sufficient, but it omits any routing cue among its three sibling verification tiers, which is the main decision an agent faces here.

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 (asOf, claim, language, maxSources, sourcePolicy, freshnessHours, minimumSources, includeConflicts, etc.) are already fully documented in the schema, including defaults and the official_only/allowedDomains dependency. The description adds no parameter meaning on top of that, so the baseline of 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 specific verb and resource ('verify' a 'claim') plus a tier qualifier ('research-grade verification with the largest search and evidence budget'). The 'largest budget' framing implicitly differentiates it from verify_claim_quick/deep, but no sibling is named explicitly, so an agent must still infer the ordering among four near-identical tools.

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 superlative 'largest search and evidence budget' implies when to reach for this tier (maximum thoroughness), but there is no explicit when-to-use versus verify_claim, verify_claim_deep, or verify_claim_quick, and no guidance on when the extra cost is not worth it. Usage is only implied.

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

All Web Evidence tools Inspect

Try in Browser

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Glama MCP Gateway

Add one secure layer between your agents and this server.