usedby

Compare two tools

compare

Read-onlyIdempotent

Two tools side by side: public customers with their proof mix, top industries, the companies on both (every proof level, each side's level given), and vendor facts with their sources. Name only the companies returned in overlap.shared: it counts every company with a line on both tools, at any proof level, and gives each side's proof; say when one side is a job-post SIGNAL. Each claim separates relationship meaning from proof strength. Cite claim.url and its original claim.source.url when available. Report limitations and null as unknown. Capture and verification dates are checks, never adoption or source publication dates. Do not infer current contract, spend or deployment; no calibrated confidence score is provided. MCP may return fewer rows to fit its byte budget; keep filters and options on continuation. For enumeration pass pagination.nextOffset with pagination.snapshot (REST: follow pagination.next), and restart at offset 0 if the snapshot expires. includeEvidence or one structured constraint adds pilot evidence, separate from counts: a supported observation does not imply plan-wide suitability. Only assessment.eligible establishes that the requested exact criterion is supported; unknown/stale/conflicting evidence needs checking. Source capture dates do not establish current deployment. includeCapabilities returns documentation and operational-test status separately. Only a fresh tested_pass receipt verifies its exact task, operation, endpoint, version and plan; never generalize a read test to writes or untested scopes. blocked/not_tested means access or evidence is missing, not that a product lacks the capability.

Input Schema

Name	Required	Description
`a`	Yes	First tool slug or name.
`b`	Yes	Second tool slug or name.
`limit`	No	Rows to list (default 25, max 100). MCP may return fewer rows to fit its response budget; follow pagination.nextOffset and snapshot.
`offset`	No	Zero-based list offset within 200 public rows, or 10000 with an explicitly granted data:bulk bearer credential. nextOffset=null can mean the public cap; inspect truncated. Bulk access: contact@usedby.ai.
`snapshot`	No	Pass pagination.snapshot on later pages. Restart if it expired.
`constraint`	No	Check one exact requirement against sourced facts. Unknown, stale or wrong-plan facts never pass. Automatically includes evidence.
`includeEvidence`	No	Include bounded reviewed task examples and scoped choice facts for the 100-tool accepted catalog. No change to customer counts.
`includeCapabilities`	No	Include official/community API or MCP profiles and scoped operational test receipts. Documentation alone is not a successful test. Unknown access does not mean the product lacks a capability.

Output Schema

Name	Required	Description
`a`	No	First tool.
`b`	No	Second tool.
`error`	No	Set when the input matched nothing, was invalid, or the answer could not be returned.
`notes`	No	How to read this answer.
`source`	Yes	The usedby page to cite: quote with a link to source.url.
`message`	No	What went wrong, with the next step, when error is set.
`overlap`	No
`pagination`	No	List continuation; next is the REST URL for the same cached snapshot.
`latestCheck`	No	Latest verification or capture of a public line.
`suggestions`	No	Close matches to ask again with, when error is not_found.
`decisionEvidence`	No
`agentCapabilities`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 26, 2026

changedInput schema / properties / includeEvidence / description

Previous value: -"Include bounded reviewed task examples and scoped choice facts for the 12-tool pilot. No change to customer counts."New value: +"Include bounded reviewed task examples and scoped choice facts for the 100-tool accepted catalog. No change to customer counts."

Changed4 schema fields changedOct 25, 2026

changedInput schema / properties / limit / description

Previous value: -"Rows to list (default 25, max 100). The usedby page has the full list."New value: +"Rows to list (default 25, max 100). MCP may return fewer rows to fit its response budget; follow pagination.nextOffset and snapshot."

changedOutput schema / properties / error / description

Previous value: -"Set only when the input matched nothing or was invalid."New value: +"Set when the input matched nothing, was invalid, or the answer could not be returned."

changedOutput schema / properties / overlap / properties / shared / items / properties / claim / properties / a / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "description": "Canonical public relationship provenance. Null means unknown; dates and proof do not establish current deployment.",
-    "properties": {
-      "dates": {
-        "additionalProperties": {},
-        "properties": {
-          "firstPublicProof": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "properties": {
-                  "date": {
-                    "type": "string"
-                  },
-                  "kind": {
-                    "enum": [
-                      "on_or_before",
-                      "job_post",
-                      "stated"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "description": "Upper bound of when the line became public: never an adoption date."
-          },
-          "firstSeenAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "lastSeenAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "sourcePublishedAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "freshness": {
-        "additionalProperties": {},
-        "properties": {
-          "capturedAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "lastVerifiedAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "id": {
-        "type": "string"
-      },
-      "limitations": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "proof": {
-        "additionalProperties": {},
-        "properties": {
-          "level": {
-            "description": "Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest).",
-            "enum": [
-              "CONFIRMED",
-              "DECLARED",
-              "OBSERVED",
-              "SIGNAL"
-            ],
-            "type": "string"
-          },
-          "method": {
-            "anyOf": [
-              {
-                "enum": [
-                  "CASE_STUDY",
-                  "TESTIMONIAL",
-                  "PRESS",
-                  "DECLARED",
-                  "SUBPROCESSOR_LIST",
-                  "LOGO_WALL",
-                  "MANUAL",
-                  "DOMAIN_RECORD",
-                  "REPO_CONFIG",
-                  "JOB_POST"
-                ],
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "relationship": {
-        "additionalProperties": {},
-        "properties": {
-          "label": {
-            "type": "string"
-          },
-          "type": {
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "source": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "evidenceId": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "excerpt": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "snapshot": {
-                "anyOf": [
-                  {
-                    "additionalProperties": {},
-                    "properties": {
-                      "hash": {
-                        "anyOf": [
-                          {
-                            "type": "string"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "url": {
-                        "type": "string"
-                      }
-                    },
-                    "type": "object"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "url": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "url": {
-        "type": "string"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "description": "Canonical public relationship provenance. Null means unknown; dates and proof do not establish current deployment.",
+    "properties": {
+      "citation": {
+        "description": "Entity-pair citation with the matching claim and primary source URLs; never substitute a neighboring row.",
+        "type": "string"
+      },
+      "dates": {
+        "additionalProperties": {},
+        "properties": {
+          "firstPublicProof": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "properties": {
+                  "date": {
+                    "type": "string"
+                  },
+                  "kind": {
+                    "enum": [
+                      "on_or_before",
+                      "job_post",
+                      "stated"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Relationship-level date: on_or_before is an upper bound; job_post does not date usage start; stated means what the source explicitly states. Binding to the selected source is unverified."
+          },
+          "firstPublicProofScope": {
+            "const": "relationship",
+            "type": "string"
+          },
+          "firstPublicProofSourceBinding": {
+            "const": "unverified",
+            "type": "string"
+          },
+          "firstSeenAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "lastSeenAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourcePublishedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourcePublishedAtStatus": {
+            "const": "unknown",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "freshness": {
+        "additionalProperties": {},
+        "properties": {
+          "capturedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "lastVerifiedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "id": {
+        "type": "string"
+      },
+      "limitations": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "proof": {
+        "additionalProperties": {},
+        "properties": {
+          "level": {
+            "description": "Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest).",
+            "enum": [
+              "CONFIRMED",
+              "DECLARED",
+              "OBSERVED",
+              "SIGNAL"
+            ],
+            "type": "string"
+          },
+          "method": {
+            "anyOf": [
+              {
+                "enum": [
+                  "CASE_STUDY",
+                  "TESTIMONIAL",
+                  "PRESS",
+                  "DECLARED",
+                  "SUBPROCESSOR_LIST",
+                  "LOGO_WALL",
+                  "MANUAL",
+                  "DOMAIN_RECORD",
+                  "REPO_CONFIG",
+                  "JOB_POST"
+                ],
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "relationship": {
+        "additionalProperties": {},
+        "properties": {
+          "label": {
+            "type": "string"
+          },
+          "type": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "source": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "evidenceId": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "excerpt": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "snapshot": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "hash": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "url": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "snapshotStatus": {
+                "enum": [
+                  "public_snapshot_available",
+                  "no_public_snapshot_exposed"
+                ],
+                "type": "string"
+              },
+              "url": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "url": {
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / overlap / properties / shared / items / properties / claim / properties / b / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "description": "Canonical public relationship provenance. Null means unknown; dates and proof do not establish current deployment.",
-    "properties": {
-      "dates": {
-        "additionalProperties": {},
-        "properties": {
-          "firstPublicProof": {
-            "anyOf": [
-              {
-                "additionalProperties": {},
-                "properties": {
-                  "date": {
-                    "type": "string"
-                  },
-                  "kind": {
-                    "enum": [
-                      "on_or_before",
-                      "job_post",
-                      "stated"
-                    ],
-                    "type": "string"
-                  }
-                },
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "description": "Upper bound of when the line became public: never an adoption date."
-          },
-          "firstSeenAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "lastSeenAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "sourcePublishedAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "freshness": {
-        "additionalProperties": {},
-        "properties": {
-          "capturedAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "lastVerifiedAt": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "id": {
-        "type": "string"
-      },
-      "limitations": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "proof": {
-        "additionalProperties": {},
-        "properties": {
-          "level": {
-            "description": "Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest).",
-            "enum": [
-              "CONFIRMED",
-              "DECLARED",
-              "OBSERVED",
-              "SIGNAL"
-            ],
-            "type": "string"
-          },
-          "method": {
-            "anyOf": [
-              {
-                "enum": [
-                  "CASE_STUDY",
-                  "TESTIMONIAL",
-                  "PRESS",
-                  "DECLARED",
-                  "SUBPROCESSOR_LIST",
-                  "LOGO_WALL",
-                  "MANUAL",
-                  "DOMAIN_RECORD",
-                  "REPO_CONFIG",
-                  "JOB_POST"
-                ],
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "type": "object"
-      },
-      "relationship": {
-        "additionalProperties": {},
-        "properties": {
-          "label": {
-            "type": "string"
-          },
-          "type": {
-            "type": "string"
-          }
-        },
-        "type": "object"
-      },
-      "source": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "properties": {
-              "evidenceId": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "excerpt": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "snapshot": {
-                "anyOf": [
-                  {
-                    "additionalProperties": {},
-                    "properties": {
-                      "hash": {
-                        "anyOf": [
-                          {
-                            "type": "string"
-                          },
-                          {
-                            "type": "null"
-                          }
-                        ]
-                      },
-                      "url": {
-                        "type": "string"
-                      }
-                    },
-                    "type": "object"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              },
-              "url": {
-                "anyOf": [
-                  {
-                    "type": "string"
-                  },
-                  {
-                    "type": "null"
-                  }
-                ]
-              }
-            },
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "url": {
-        "type": "string"
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "description": "Canonical public relationship provenance. Null means unknown; dates and proof do not establish current deployment.",
+    "properties": {
+      "citation": {
+        "description": "Entity-pair citation with the matching claim and primary source URLs; never substitute a neighboring row.",
+        "type": "string"
+      },
+      "dates": {
+        "additionalProperties": {},
+        "properties": {
+          "firstPublicProof": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "properties": {
+                  "date": {
+                    "type": "string"
+                  },
+                  "kind": {
+                    "enum": [
+                      "on_or_before",
+                      "job_post",
+                      "stated"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Relationship-level date: on_or_before is an upper bound; job_post does not date usage start; stated means what the source explicitly states. Binding to the selected source is unverified."
+          },
+          "firstPublicProofScope": {
+            "const": "relationship",
+            "type": "string"
+          },
+          "firstPublicProofSourceBinding": {
+            "const": "unverified",
+            "type": "string"
+          },
+          "firstSeenAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "lastSeenAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourcePublishedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "sourcePublishedAtStatus": {
+            "const": "unknown",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "freshness": {
+        "additionalProperties": {},
+        "properties": {
+          "capturedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "lastVerifiedAt": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "id": {
+        "type": "string"
+      },
+      "limitations": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "proof": {
+        "additionalProperties": {},
+        "properties": {
+          "level": {
+            "description": "Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest).",
+            "enum": [
+              "CONFIRMED",
+              "DECLARED",
+              "OBSERVED",
+              "SIGNAL"
+            ],
+            "type": "string"
+          },
+          "method": {
+            "anyOf": [
+              {
+                "enum": [
+                  "CASE_STUDY",
+                  "TESTIMONIAL",
+                  "PRESS",
+                  "DECLARED",
+                  "SUBPROCESSOR_LIST",
+                  "LOGO_WALL",
+                  "MANUAL",
+                  "DOMAIN_RECORD",
+                  "REPO_CONFIG",
+                  "JOB_POST"
+                ],
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "type": "object"
+      },
+      "relationship": {
+        "additionalProperties": {},
+        "properties": {
+          "label": {
+            "type": "string"
+          },
+          "type": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "source": {
+        "anyOf": [
+          {
+            "additionalProperties": {},
+            "properties": {
+              "evidenceId": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "excerpt": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "snapshot": {
+                "anyOf": [
+                  {
+                    "additionalProperties": {},
+                    "properties": {
+                      "hash": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "url": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "snapshotStatus": {
+                "enum": [
+                  "public_snapshot_available",
+                  "no_public_snapshot_exposed"
+                ],
+                "type": "string"
+              },
+              "url": {
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              }
+            },
+            "type": "object"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "url": {
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed1 schema field changedOct 25, 2026

addedOutput schema / properties / overlap / properties / shared / items / properties / claim

Added value: +{
+  "additionalProperties": {},
+  "properties": {
+    "a": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "description": "Canonical public relationship provenance. Null means unknown; dates and proof do not establish current deployment.",
+          "properties": {
+            "dates": {
+              "additionalProperties": {},
+              "properties": {
+                "firstPublicProof": {
+                  "anyOf": [
+                    {
+                      "additionalProperties": {},
+                      "properties": {
+                        "date": {
+                          "type": "string"
+                        },
+                        "kind": {
+                          "enum": [
+                            "on_or_before",
+                            "job_post",
+                            "stated"
+                          ],
+                          "type": "string"
+                        }
+                      },
+                      "type": "object"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ],
+                  "description": "Upper bound of when the line became public: never an adoption date."
+                },
+                "firstSeenAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "lastSeenAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "sourcePublishedAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "freshness": {
+              "additionalProperties": {},
+              "properties": {
+                "capturedAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "lastVerifiedAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "id": {
+              "type": "string"
+            },
+            "limitations": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "proof": {
+              "additionalProperties": {},
+              "properties": {
+                "level": {
+                  "description": "Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest).",
+                  "enum": [
+                    "CONFIRMED",
+                    "DECLARED",
+                    "OBSERVED",
+                    "SIGNAL"
+                  ],
+                  "type": "string"
+                },
+                "method": {
+                  "anyOf": [
+                    {
+                      "enum": [
+                        "CASE_STUDY",
+                        "TESTIMONIAL",
+                        "PRESS",
+                        "DECLARED",
+                        "SUBPROCESSOR_LIST",
+                        "LOGO_WALL",
+                        "MANUAL",
+                        "DOMAIN_RECORD",
+                        "REPO_CONFIG",
+                        "JOB_POST"
+                      ],
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "relationship": {
+              "additionalProperties": {},
+              "properties": {
+                "label": {
+                  "type": "string"
+                },
+                "type": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "source": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "evidenceId": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "excerpt": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "snapshot": {
+                      "anyOf": [
+                        {
+                          "additionalProperties": {},
+                          "properties": {
+                            "hash": {
+                              "anyOf": [
+                                {
+                                  "type": "string"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            },
+                            "url": {
+                              "type": "string"
+                            }
+                          },
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "url": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "url": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "b": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "description": "Canonical public relationship provenance. Null means unknown; dates and proof do not establish current deployment.",
+          "properties": {
+            "dates": {
+              "additionalProperties": {},
+              "properties": {
+                "firstPublicProof": {
+                  "anyOf": [
+                    {
+                      "additionalProperties": {},
+                      "properties": {
+                        "date": {
+                          "type": "string"
+                        },
+                        "kind": {
+                          "enum": [
+                            "on_or_before",
+                            "job_post",
+                            "stated"
+                          ],
+                          "type": "string"
+                        }
+                      },
+                      "type": "object"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ],
+                  "description": "Upper bound of when the line became public: never an adoption date."
+                },
+                "firstSeenAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "lastSeenAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "sourcePublishedAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "freshness": {
+              "additionalProperties": {},
+              "properties": {
+                "capturedAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "lastVerifiedAt": {
+                  "anyOf": [
+                    {
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "id": {
+              "type": "string"
+            },
+            "limitations": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "proof": {
+              "additionalProperties": {},
+              "properties": {
+                "level": {
+                  "description": "Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest).",
+                  "enum": [
+                    "CONFIRMED",
+                    "DECLARED",
+                    "OBSERVED",
+                    "SIGNAL"
+                  ],
+                  "type": "string"
+                },
+                "method": {
+                  "anyOf": [
+                    {
+                      "enum": [
+                        "CASE_STUDY",
+                        "TESTIMONIAL",
+                        "PRESS",
+                        "DECLARED",
+                        "SUBPROCESSOR_LIST",
+                        "LOGO_WALL",
+                        "MANUAL",
+                        "DOMAIN_RECORD",
+                        "REPO_CONFIG",
+                        "JOB_POST"
+                      ],
+                      "type": "string"
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                }
+              },
+              "type": "object"
+            },
+            "relationship": {
+              "additionalProperties": {},
+              "properties": {
+                "label": {
+                  "type": "string"
+                },
+                "type": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "source": {
+              "anyOf": [
+                {
+                  "additionalProperties": {},
+                  "properties": {
+                    "evidenceId": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "excerpt": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "snapshot": {
+                      "anyOf": [
+                        {
+                          "additionalProperties": {},
+                          "properties": {
+                            "hash": {
+                              "anyOf": [
+                                {
+                                  "type": "string"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
+                            },
+                            "url": {
+                              "type": "string"
+                            }
+                          },
+                          "type": "object"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    },
+                    "url": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
+                    }
+                  },
+                  "type": "object"
+                },
+                {
+                  "type": "null"
+                }
+              ]
+            },
+            "url": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "type": "object"
+}

Changed2 schema fields changedOct 23, 2026

changedInput schema / properties / offset / description

Previous value: -"Zero-based list offset within the first 200 public rows. nextOffset=null can mean the public cap; inspect truncated. Bulk access: contact@usedby.ai."New value: +"Zero-based list offset within 200 public rows, or 10000 with an explicitly granted data:bulk bearer credential. nextOffset=null can mean the public cap; inspect truncated. Bulk access: contact@usedby.ai."

changedInput schema / properties / offset / maximum
```
Previous value: -199New value: +9999
```

Changed2 schema fields changedOct 23, 2026

changedInput schema / properties / offset / description

Previous value: -"Zero-based list offset. Follow pagination.nextOffset until null."New value: +"Zero-based list offset within the first 200 public rows. nextOffset=null can mean the public cap; inspect truncated. Bulk access: contact@usedby.ai."

changedInput schema / properties / offset / maximum
```
Previous value: -1000000New value: +199
```

Changed2 schema fields changedOct 22, 2026

addedInput schema / properties / includeCapabilities

Added value: +{
+  "description": "Include official/community API or MCP profiles and scoped operational test receipts. Documentation alone is not a successful test. Unknown access does not mean the product lacks a capability.",
+  "type": "boolean"
+}

addedOutput schema / properties / agentCapabilities

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "a": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "coverage": {
+              "additionalProperties": false,
+              "properties": {
+                "blocked": {
+                  "type": "number"
+                },
+                "documented": {
+                  "type": "number"
+                },
+                "expired": {
+                  "type": "number"
+                },
+                "notTested": {
+                  "type": "number"
+                },
+                "profiles": {
+                  "type": "number"
+                },
+                "testedFail": {
+                  "type": "number"
+                },
+                "testedPass": {
+                  "type": "number"
+                },
+                "unknownDocumentation": {
+                  "type": "number"
+                }
+              },
+              "required": [
+                "profiles",
+                "documented",
+                "unknownDocumentation",
+                "testedPass",
+                "testedFail",
+                "blocked",
+                "notTested",
+                "expired"
+              ],
+              "type": "object"
+            },
+            "error": {
+              "const": "invalid_manifest",
+              "type": "string"
+            },
+            "evaluatedAt": {
+              "type": "string"
+            },
+            "profiles": {
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "auth": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "method": {
+                        "maxLength": 2000,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "scopes": {
+                        "anyOf": [
+                          {
+                            "items": {
+                              "maxLength": 160,
+                              "minLength": 1,
+                              "type": "string"
+                            },
+                            "maxItems": 32,
+                            "type": "array"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "required": [
+                      "method",
+                      "scopes"
+                    ],
+                    "type": "object"
+                  },
+                  "capability": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "endpoint": {
+                        "anyOf": [
+                          {
+                            "maxLength": 1000,
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "endpointTemplate": {
+                        "anyOf": [
+                          {
+                            "maxLength": 1000,
+                            "minLength": 1,
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ],
+                        "default": null
+                      },
+                      "id": {
+                        "maxLength": 160,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "operations": {
+                        "items": {
+                          "additionalProperties": false,
+                          "properties": {
+                            "effect": {
+                              "enum": [
+                                "read",
+                                "write"
+                              ],
+                              "type": "string"
+                            },
+                            "method": {
+                              "maxLength": 20,
+                              "minLength": 1,
+                              "type": "string"
+                            },
+                            "name": {
+                              "maxLength": 160,
+                              "minLength": 1,
+                              "type": "string"
+                            }
+                          },
+                          "required": [
+                            "name",
+                            "method",
+                            "effect"
+                          ],
+                          "type": "object"
+                        },
+                        "maxItems": 12,
+                        "type": "array"
+                      },
+                      "protocol": {
+                        "anyOf": [
+                          {
+                            "enum": [
+                              "rest",
+                              "mcp"
+                            ],
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "task": {
+                        "maxLength": 160,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      "version": {
+                        "anyOf": [
+                          {
+                            "maxLength": 160,
+                            "minLength": 1,
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "required": [
+                      "id",
+                      "protocol",
+                      "task",
+                      "endpoint",
+                      "endpointTemplate",
+                      "version",
+                      "operations"
+                    ],
+                    "type": "object"
+                  },
+                  "checkedAt": {
+                    "format": "date-time",
+                    "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+                    "type": "string"
+                  },
+                  "costs": {
+                    "anyOf": [
+                      {
+                        "maxLength": 2000,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "documentationStatus": {
+                    "enum": [
+                      "documented",
+                      "expired",
+                      "unknown"
+                    ],
+                    "type": "string"
+                  },
+                  "limits": {
+                    "anyOf": [
+                      {
+                        "maxLength": 2000,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "manualSteps": {
+                    "items": {
+                      "maxLength": 2000,
+                      "minLength": 1,
+                      "type": "string"
+                    },
+                    "maxItems": 12,
+                    "type": "array"
+                  },
+                  "plan": {
+                    "anyOf": [
+                      {
+                        "maxLength": 160,
+                        "minLength": 1,
+                        "type": "string"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "product": {
+                    "maxLength": 160,
+                    "minLength": 1,
+                    "type": "string"
+                  },
+                  "publisher": {
+                    "additionalProperties": false,
+                    "properties": {
+                      "kind": {
+                        "enum": [
+                          "official",
+                          "community"
+                        ],
+                        "type": "string"
+                      },
+                      "name": {
+                        "maxLength": 160,
+                        "minLength": 1,
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "name",
+                      "kind"
+                    ],
+                    "type": "object"
+                  },
+                  "sources": {
+                    "items": {
+                      "additionalProperties": false,
+                      "properties": {
+                        "claims": {
+                          "items": {
+                            "maxLength": 160,
+                            "minLength": 1,
+                            "type": "string"
+                          },
+                          "maxItems": 16,
+                          "type": "array"
+                        },
+                        "passage": {
+                          "maxLength": 2000,
+                          "minLength": 1,
+                          "type": "string"
+                        },
+                        "url": {
+                          "maxLength": 1000,
+                          "type": "string"
+                        }
+                      },
+                      "required": [
+                        "url",
+                        "passage",
+                        "claims"
+                      ],
+                      "type": "object"
+                    },
+                    "maxItems": 8,
+                    "type": "array"
+                  },
+                  "status": {
+                    "enum": [
+                      "documented",
+                      "tested_pass",
+                      "tested_fail",
+                      "blocked",
+                      "not_tested",
+                      "expired"
+                    ],
+                    "type": "string"
+                  },
+                  "test": {
+                    "anyOf": [
+                      {
+                        "additionalProperties": false,
+                        "properties": {
+                          "assertions": {
+                            "items": {
+                              "additionalProperties": false,
+                              "properties": {
+                                "name": {
+                                  "maxLength": 160,
+                                  "minLength": 1,
+                                  "type": "string"
+                                },
+                                "passed": {
+                                  "type": "boolean"
+                                }
+                              },
+                              "required": [
+                                "name",
+                                "passed"
+                              ],
+                              "type": "object"
+                            },
+                            "maxItems": 32,
+                            "type": "array"
+                          },
+                          "authScopes": {
+                            "items": {
+                              "maxLength": 160,
+                              "minLength": 1,
+                              "type": "string"
+                            },
+                            "maxItems": 32,
+                            "type": "array"
+                          },
+                          "durationMs": {
+                            "maximum": 86400000,
+                            "minimum": 0,
+                            "type": "number"
+                          },
+                          "errorReason": {
+                            "anyOf": [
+                              {
+                                "pattern": "^[a-z][a-z0-9_]{0,79}$",
+                                "type": "string"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "expected": {
+                            "maxLength": 2000,
+                            "minLength": 1,
+                            "type": "string"
+                          },
+                          "finishedAt": {
+                            "format": "date-time",
+                            "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+                            "type": "string"
+                          },
+                          "fixtureSha256": {
+                            "anyOf": [
+                              {
+                                "pattern": "^[a-f0-9]{64}$",
+                                "type": "string"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          },
+                          "id": {
+                            "maxLength": 160,
+                            "minLength": 1,
+                            "type": "string"
+                          },
+                          "observedCost": {
+                            "anyOf": [
+                              {
+                                "additionalProperties": false,
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+                              "tested_fail",
+                              "blocked",
+                              "not_tested",
+                              "expired"
+                            ],
+                            "type": "string"
+                          },
+                          "validityReason": {
+                            "anyOf": [
+                              {
+                                "type": "string"
+                              },
+                              {
+                                "type": "null"
+                              }
+                            ]
+                          }
+                        },
+                        "required": [
+                          "id",
+                          "profileSha256",
+                          "scope",
+                          "runtime",
+                          "authScopes",
+                          "fixtureSha256",
+                          "expected",
+                          "assertions",
+                          "startedAt",
+                          "finishedAt",
+                          "durationMs",
+                          "observedCost",
+                          "errorReason",
+                          "status",
+                          "recordedStatus",
+                          "validityReason"
+                        ],
+                        "type": "object"
+                      },
+                      {
+                        "type": "null"
+                      }
+                    ]
+                  },
+                  "testStatus": {
+                    "enum": [
+                      "documented",
+                      "tested_pass",
+                      "tested_fail",
+                      "blocked",
+                      "not_tested",
+                      "expired"
+                    ],
+                    "type": "string"
+                  },
+                  "toolSlug": {
+                    "maxLength": 160,
+                    "minLength": 1,
+                    "type": "string"
+                  },
+                  "unknowns": {
+                    "items": {
+                      "maxLength": 2000,
+                      "minLength": 1,
+                      "type": "string"
+                    },
+                    "maxItems": 16,
+                    "type": "array"
+                  }
+                },
+                "required": [
+                  "toolSlug",
+                  "product",
+                  "plan",
+                  "publisher",
+                  "capability",
+                  "auth",
+                  "manualSteps",
+                  "limits",
+                  "costs",
+                  "checkedAt",
+                  "sources",
+                  "unknowns",
+                  "status",
+                  "documentationStatus",
+                  "testStatus",
+                  "test"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "status": {
+              "enum": [
+                "available",
+                "unavailable"
+              ],
+              "type": "string"
+            },
+            "toolSlug": {
+              "type": "string"
+            },
+            "version": {
+              "const": 1,
+              "type": "number"
+            }
+          },
+          "required": [
+            "version",
+            "toolSlug",
+            "status",
+            "evaluatedAt",
+            "profiles",
+            "coverage"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    }
+  },
+  "required": [
+    "a",
+    "b"
+  ],
+  "type": "object"
+}

Changed3 schema fields changedOct 22, 2026

addedInput schema / properties / constraint

Added value: +{
+  "additionalProperties": false,
+  "description": "Check one exact requirement against sourced facts. Unknown, stale or wrong-plan facts never pass. Automatically includes evidence.",
+  "properties": {
+    "criterion": {
+      "enum": [
+        "pricing",
+        "free_trial",
+        "integrations",
+        "languages",
+        "certifications",
+        "data_training",
+        "data_residency",
+        "dpa",
+        "api_access",
+        "export_availability",
+        "usage_limits",
+        "required_plan"
+      ],
+      "type": "string"
+    },
+    "expected": {
+      "anyOf": [
+        {
+          "maxLength": 160,
+          "minLength": 1,
+          "type": "string"
+        },
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "number"
+        }
+      ]
+    },
+    "language": {
+      "maxLength": 100,
+      "minLength": 1,
+      "type": "string"
+    },
+    "plan": {
+      "maxLength": 100,
+      "minLength": 1,
+      "type": "string"
+    },
+    "region": {
+      "maxLength": 100,
+      "minLength": 1,
+      "type": "string"
+    },
+    "volumeBasis": {
+      "maxLength": 100,
+      "minLength": 1,
+      "type": "string"
+    }
+  },
+  "required": [
+    "criterion",
+    "expected"
+  ],
+  "type": "object"
+}

addedInput schema / properties / includeEvidence

Added value: +{
+  "description": "Include bounded reviewed task examples and scoped choice facts for the 12-tool pilot. No change to customer counts.",
+  "type": "boolean"
+}

addedOutput schema / properties / decisionEvidence

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "a": {
+      "additionalProperties": false,
+      "properties": {
+        "assessment": {
+          "additionalProperties": false,
+          "properties": {
+            "eligible": {
+              "type": "boolean"
+            },
+            "evidence": {
+              "items": {
+                "additionalProperties": {},
+                "properties": {},
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "reason": {
+              "type": "string"
+            },
+            "status": {
+              "enum": [
+                "supported",
+                "contradicted",
+                "unknown",
+                "stale",
+                "conflicting"
+              ],
+              "type": "string"
+            }
+          },
+          "required": [
+            "status",
+            "eligible",
+            "reason",
+            "evidence"
+          ],
+          "type": "object"
+        },
+        "evidence": {
+          "anyOf": [
+            {
+              "additionalProperties": {},
+              "properties": {
+                "constraints": {
+                  "items": {
+                    "additionalProperties": {},
+                    "properties": {
+                      "criterion": {
+                        "type": "string"
+                      },
+                      "passage": {
+                        "type": "string"
+                      },
+                      "sourceUrl": {
+                        "type": "string"
+                      },
+                      "status": {
+                        "type": "string"
+                      },
+                      "value": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "number"
+                          },
+                          {
+                            "type": "boolean"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "required": [
+                      "criterion",
+                      "value",
+                      "status",
+                      "passage",
+                      "sourceUrl"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                },
+                "productId": {
+                  "type": "string"
+                },
+                "status": {
+                  "enum": [
+                    "available",
+                    "unavailable"
+                  ],
+                  "type": "string"
+                },
+                "usages": {
+                  "items": {
+                    "additionalProperties": {},
+                    "properties": {
+                      "passage": {
+                        "type": "string"
+                      },
+                      "source": {
+                        "additionalProperties": {},
+                        "properties": {
+                          "capturedAt": {
+                            "type": "string"
+                          },
+                          "url": {
+                            "type": "string"
+                          }
+                        },
+                        "required": [
+                          "url",
+                          "capturedAt"
+                        ],
+                        "type": "object"
+                      }
+                    },
+                    "required": [
+                      "passage",
+                      "source"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "status",
+                "productId",
+                "usages",
+                "constraints"
+              ],
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "required": [
+        "evidence"
+      ],
+      "type": "object"
+    },
+    "b": {
+      "additionalProperties": false,
+      "properties": {
+        "assessment": {
+          "additionalProperties": false,
+          "properties": {
+            "eligible": {
+              "type": "boolean"
+            },
+            "evidence": {
+              "items": {
+                "additionalProperties": {},
+                "properties": {},
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "reason": {
+              "type": "string"
+            },
+            "status": {
+              "enum": [
+                "supported",
+                "contradicted",
+                "unknown",
+                "stale",
+                "conflicting"
+              ],
+              "type": "string"
+            }
+          },
+          "required": [
+            "status",
+            "eligible",
+            "reason",
+            "evidence"
+          ],
+          "type": "object"
+        },
+        "evidence": {
+          "anyOf": [
+            {
+              "additionalProperties": {},
+              "properties": {
+                "constraints": {
+                  "items": {
+                    "additionalProperties": {},
+                    "properties": {
+                      "criterion": {
+                        "type": "string"
+                      },
+                      "passage": {
+                        "type": "string"
+                      },
+                      "sourceUrl": {
+                        "type": "string"
+                      },
+                      "status": {
+                        "type": "string"
+                      },
+                      "value": {
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "number"
+                          },
+                          {
+                            "type": "boolean"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "required": [
+                      "criterion",
+                      "value",
+                      "status",
+                      "passage",
+                      "sourceUrl"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                },
+                "productId": {
+                  "type": "string"
+                },
+                "status": {
+                  "enum": [
+                    "available",
+                    "unavailable"
+                  ],
+                  "type": "string"
+                },
+                "usages": {
+                  "items": {
+                    "additionalProperties": {},
+                    "properties": {
+                      "passage": {
+                        "type": "string"
+                      },
+                      "source": {
+                        "additionalProperties": {},
+                        "properties": {
+                          "capturedAt": {
+                            "type": "string"
+                          },
+                          "url": {
+                            "type": "string"
+                          }
+                        },
+                        "required": [
+                          "url",
+                          "capturedAt"
+                        ],
+                        "type": "object"
+                      }
+                    },
+                    "required": [
+                      "passage",
+                      "source"
+                    ],
+                    "type": "object"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "status",
+                "productId",
+                "usages",
+                "constraints"
+              ],
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        }
+      },
+      "required": [
+        "evidence"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "a",
+    "b"
+  ],
+  "type": "object"
+}

Changed6 schema fields changedOct 16, 2026

addedOutput schema / properties / a / properties / customers / properties / mix / properties / declared
```
Added value: +{
+  "type": "number"
+}
```
addedOutput schema / properties / b / properties / customers / properties / mix / properties / declared
```
Added value: +{
+  "type": "number"
+}
```

changedOutput schema / properties / overlap / properties / shared / items / properties / proof / properties / a / description

Previous value: -"Proof level, strongest first: CONFIRMED, OBSERVED, SIGNAL (a job post, the weakest)."New value: +"Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest)."

changedOutput schema / properties / overlap / properties / shared / items / properties / proof / properties / a / enum

Previous value: -[
-  "CONFIRMED",
-  "OBSERVED",
-  "SIGNAL"
-]New value: +[
+  "CONFIRMED",
+  "DECLARED",
+  "OBSERVED",
+  "SIGNAL"
+]

changedOutput schema / properties / overlap / properties / shared / items / properties / proof / properties / b / description

Previous value: -"Proof level, strongest first: CONFIRMED, OBSERVED, SIGNAL (a job post, the weakest)."New value: +"Proof level, strongest first: CONFIRMED, DECLARED (the company states it), OBSERVED, SIGNAL (a job post, the weakest)."

changedOutput schema / properties / overlap / properties / shared / items / properties / proof / properties / b / enum

Previous value: -[
-  "CONFIRMED",
-  "OBSERVED",
-  "SIGNAL"
-]New value: +[
+  "CONFIRMED",
+  "DECLARED",
+  "OBSERVED",
+  "SIGNAL"
+]

Changed3 schema fields changedOct 12, 2026

addedInput schema / properties / offset

Added value: +{
+  "description": "Zero-based list offset. Follow pagination.nextOffset until null.",
+  "maximum": 1000000,
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / snapshot

Added value: +{
+  "description": "Pass pagination.snapshot on later pages. Restart if it expired.",
+  "maxLength": 100,
+  "type": "string"
+}

addedOutput schema / properties / pagination

Added value: +{
+  "additionalProperties": {},
+  "description": "List continuation; next is the REST URL for the same cached snapshot.",
+  "properties": {
+    "next": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "nextOffset": {
+      "anyOf": [
+        {
+          "type": "number"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "offset": {
+      "type": "number"
+    },
+    "snapshot": {
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Changed4 schema fields changedOct 11, 2026

changedOutput schema / properties / overlap / properties / both / description

Previous value: -"Companies confirmed or observed on both tools."New value: +"Companies with a line on both tools, at any proof level (job-post signals included)."

addedOutput schema / properties / overlap / properties / shared / description
```
Added value: +"Companies on both tools, strongest proof first."
```

addedOutput schema / properties / overlap / properties / shared / items / properties / proof

Added value: +{
+  "additionalProperties": {},
+  "description": "Each side's proof level.",
+  "properties": {
+    "a": {
+      "description": "Proof level, strongest first: CONFIRMED, OBSERVED, SIGNAL (a job post, the weakest).",
+      "enum": [
+        "CONFIRMED",
+        "OBSERVED",
+        "SIGNAL"
+      ],
+      "type": "string"
+    },
+    "b": {
+      "description": "Proof level, strongest first: CONFIRMED, OBSERVED, SIGNAL (a job post, the weakest).",
+      "enum": [
+        "CONFIRMED",
+        "OBSERVED",
+        "SIGNAL"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

changedOutput schema / properties / overlap / properties / withSignal / description

Previous value: -"On both, but one side is a job-post signal."New value: +"Of `both`, the companies with a job-post signal (the weakest proof) on one side. Included in `both` and `shared`."

First observedOct 8, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the bar is lower, and the description still adds substantive behavior: MCP may return fewer rows to fit a byte budget, snapshots expire, bulk offsets need an explicit data:bulk credential, and no calibrated confidence score is returned. It also states that null means unknown and that capture dates are not deployment dates. It does not contradict the annotations; the only cost is that these disclosures are buried in dense prose.

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 output shape is front-loaded in the first sentence, which is good, but the remainder is a dense wall of caveats — proof levels, source citation rules, date semantics, pagination, evidence limits, test-receipt limits — with no grouping or headings. Nearly every sentence carries information, but the rules about evidence and capabilities are crammed into a single unbroken block that is hard to scan.

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?

Given eight parameters including a nested constraint object and an existing output schema, the description covers the risky parts an agent would otherwise get wrong: overlap semantics, evidence interpretation, test-receipt scope, pagination and snapshot expiry. The remaining gap is that it explains return values that the output schema already defines while never placing the tool relative to its five siblings.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3; the description earns above that by explaining what the structured options actually mean — a constraint checks one exact requirement and never passes on unknown, stale or wrong-plan facts, includeEvidence adds pilot evidence separate from counts, and includeCapabilities separates documentation from operational-test status. Those semantics go beyond the schema's own wording and materially change how the agent should set the flags.

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?

The opening sentence names a specific operation (two tools side by side) and enumerates the returned sections: customer proof mix, top industries, overlap companies with each side's proof level, and vendor facts with sources. That is far more specific than the title alone. It never names a sibling tool (who_uses, company_stack, shortlist_tools), so the agent gets no explicit differentiation between 'compare' and the adjacent per-company or per-tool 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?

There is real procedural guidance: enumerate with pagination.nextOffset and pagination.snapshot, restart at offset 0 if the snapshot expires, and use includeEvidence or a single structured constraint for pilot evidence. What is missing is selection guidance — nothing states when to call compare instead of who_uses or company_stack, nor any prerequisite for the two required slugs. Usage is implied by the output description rather than routed against alternatives.

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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