usedby

Company stack

company_stack

Read-onlyIdempotent

Tools a company publicly uses according to usedby, strongest proof first, each with its proof level (job-post signals last) and source page. Each listed line carries its proof level, strongest first: quote the per-level mix next to any total. A line whose source.method is SUBPROCESSOR_LIST is listed as a sub-processor by the company, never a described use. Name only the companies and tools returned in listed. 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. firstPublicProof is an upper bound for on_or_before; job_post does not establish usage start. It dates the relationship; binding to the selected source is unverified. Adoption needs an explicit source statement. 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.

Input Schema

Name	Required	Description
`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.
`company`	Yes	Company slug, name or website, e.g. 'stripe', 'Klarna', 'notion.so'.
`snapshot`	No	Pass pagination.snapshot on later pages. Restart if it expired.

Output Schema

Name	Required	Description
`error`	No	Set when the input matched nothing, was invalid, or the answer could not be returned.
`notes`	No	How to read this answer.
`tools`	No
`source`	Yes	The usedby page to cite: quote with a link to source.url.
`company`	No	The company, with its usedby page.
`message`	No	What went wrong, with the next step, when error is set.
`signals`	No	Job-post lines, the weakest proof.
`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.

Schema Changelog

Changes observed during successful MCP inspections.

Changed9 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."

addedOutput schema / properties / tools / properties / listed / items / properties / claim / properties / citation

Added value: +{
+  "description": "Entity-pair citation with the matching claim and primary source URLs; never substitute a neighboring row.",
+  "type": "string"
+}

changed

Output schema / properties / tools / properties / listed / items / properties / claim / properties / dates / properties / firstPublicProof / description

Previous value: -"Upper bound of when the line became public: never an adoption date."New value: +"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."

addedOutput schema / properties / tools / properties / listed / items / properties / claim / properties / dates / properties / firstPublicProofScope
```
Added value: +{
+  "const": "relationship",
+  "type": "string"
+}
```
addedOutput schema / properties / tools / properties / listed / items / properties / claim / properties / dates / properties / firstPublicProofSourceBinding
```
Added value: +{
+  "const": "unverified",
+  "type": "string"
+}
```
addedOutput schema / properties / tools / properties / listed / items / properties / claim / properties / dates / properties / sourcePublishedAtStatus
```
Added value: +{
+  "const": "unknown",
+  "type": "string"
+}
```

changedOutput schema / properties / tools / properties / listed / items / properties / claim / properties / source / anyOf

Previous value: -[
-  {
-    "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"
-  }
-]New value: +[
+  {
+    "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"
+  }
+]

changedOutput schema / properties / tools / properties / listed / items / properties / firstPublicProof / description

Previous value: -"Upper bound of when the line became public: never an adoption date."New value: +"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."

Changed1 schema field changedOct 25, 2026

addedOutput schema / properties / tools / properties / listed / items / properties / claim

Added 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"
+}

Changed1 schema field changedOct 25, 2026

changedOutput schema / properties / tools / properties / listed / items / properties / source / anyOf

Previous value: -[
-  {
-    "additionalProperties": {},
-    "properties": {
-      "capturedAt": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "method": {
-        "type": "string"
-      },
-      "url": {
-        "anyOf": [
-          {
-            "type": "string"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      }
-    },
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": {},
+    "properties": {
+      "capturedAt": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "method": {
+        "description": "How usedby knows, one of: CASE_STUDY, TESTIMONIAL, PRESS, DECLARED, SUBPROCESSOR_LIST, LOGO_WALL, MANUAL, DOMAIN_RECORD, REPO_CONFIG, JOB_POST.",
+        "type": "string"
+      },
+      "url": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      }
+    },
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed1 schema field changedOct 24, 2026

addedOutput schema / properties / company / properties / size

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": {},
+      "properties": {
+        "band": {
+          "type": "string"
+        },
+        "employeesMax": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "employeesMin": {
+          "type": "number"
+        }
+      },
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Employee band and range; null when not proven."
+}

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
```

Changed3 schema fields changedOct 16, 2026

changedOutput schema / properties / tools / properties / listed / items / properties / proof / 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 / tools / properties / listed / items / properties / proof / enum

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

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

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"
+}

First observedOct 8, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Beyond the read-only and idempotent annotations, the description discloses important behavioral traits: proof ordering, sub-processor caveat, null-as-unknown handling, date semantics, no calibrated confidence, byte-budget truncation, and snapshot expiry. These are substantial additions, though some sentences overlap output-schema interpretation rather than tool behavior.

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

Conciseness4/5

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

The description is front-loaded with the core purpose and then layers caveats logically. It is dense and repeats the strongest-proof-first idea, but for a proof-sensitive dataset most sentences carry useful interpretation guidance rather than filler.

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 the output schema, annotations, and full parameter coverage, the description covers the important limitations, proof semantics, and pagination behavior an agent needs. Its main remaining gap is not explaining when to use this tool versus sibling tools, especially who_uses.

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 company, limit, offset, and snapshot are already documented in the schema. The description reinforces continuation and snapshot restart behavior and adds a REST pagination.next note, but does not add new per-parameter syntax beyond the schema.

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 description states a specific resource and ordering: tools a company publicly uses according to usedby, strongest proof first, each with proof level and source page. It is clear what the tool returns, but it does not explicitly distinguish itself from sibling who_uses, which appears to be the reverse lookup.

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 use case is implied by the first sentence: retrieve a company's public tool stack. However, there is no explicit when-to-use versus alternatives guidance, and no sibling tools such as who_uses or compare are mentioned. Pagination guidance is provided, but it is about how to page rather than which tool to choose.

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

All usedby 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.

Resources

Need Help?