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Relay — agent service discovery

by site.chatgpt.orellise.relay-agent-services
OverviewDiscussionsAdmin

Compare agent services

compare_services
Read-onlyIdempotent

Retrieve 2–3 selected catalogue entries for comparison. Does not test providers or infer performance from their listing.

Input Schema

NameRequiredDescriptionDefault
slugsYesTwo or three distinct published service slugs returned by search_services, in the desired comparison order.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "caveat": {
-        "type": "string"
-      },
-      "generatedAt": {
-        "format": "date-time",
-        "type": "string"
-      },
-      "services": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "auth": {
-              "enum": [
-                "api-key",
-                "oauth",
-                "wallet-payment",
-                "none",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "capabilities": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "category": {
-              "enum": [
-                "search",
-                "extraction",
-                "data",
-                "browser",
-                "documents"
-              ],
-              "type": "string"
-            },
-            "color": {
-              "type": "string"
-            },
-            "description": {
-              "type": "string"
-            },
-            "docsUrl": {
-              "type": "string"
-            },
-            "endpoint": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "featured": {
-              "type": "boolean"
-            },
-            "id": {
-              "type": "string"
-            },
-            "name": {
-              "type": "string"
-            },
-            "notes": {
-              "type": "string"
-            },
-            "pricing": {
-              "additionalProperties": false,
-              "properties": {
-                "checkedAt": {
-                  "anyOf": [
-                    {
-                      "anyOf": [
-                        {
-                          "format": "date",
-                          "type": "string"
-                        },
-                        {
-                          "format": "date-time",
-                          "type": "string"
-                        }
-                      ]
-                    },
-                    {
-                      "type": "null"
-                    }
-                  ]
-                },
-                "model": {
-                  "enum": [
-                    "free",
-                    "freemium",
-                    "usage-based",
-                    "subscription",
-                    "unknown"
-                  ],
-                  "type": "string"
-                },
-                "summary": {
-                  "type": "string"
-                },
-                "url": {
-                  "type": [
-                    "string",
-                    "null"
-                  ]
-                }
-              },
-              "required": [
-                "model",
-                "summary",
-                "url",
-                "checkedAt"
-              ],
-              "type": "object"
-            },
-            "protocols": {
-              "items": {
-                "enum": [
-                  "MCP",
-                  "REST",
-                  "x402"
-                ],
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "provider": {
-              "type": "string"
-            },
-            "registryName": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "slug": {
-              "type": "string"
-            },
-            "sourceCheckedAt": {
-              "anyOf": [
-                {
-                  "format": "date",
-                  "type": "string"
-                },
-                {
-                  "format": "date-time",
-                  "type": "string"
-                }
-              ]
-            },
-            "sourceType": {
-              "enum": [
-                "registry",
-                "provider"
-              ],
-              "type": "string"
-            },
-            "sourceUrl": {
-              "type": "string"
-            },
-            "tagline": {
-              "type": "string"
-            },
-            "tags": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "verification": {
-              "enum": [
-                "listed",
-                "documented",
-                "connection-tested"
-              ],
-              "type": "string"
-            },
-            "website": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "id",
-            "slug",
-            "name",
-            "provider",
-            "tagline",
-            "description",
-            "website",
-            "docsUrl",
-            "category",
-            "tags",
-            "capabilities",
-            "protocols",
-            "auth",
-            "pricing",
-            "endpoint",
-            "registryName",
-            "sourceUrl",
-            "sourceType",
-            "sourceCheckedAt",
-            "verification",
-            "notes",
-            "featured",
-            "color"
-          ],
-          "type": "object"
-        },
-        "maxItems": 3,
-        "minItems": 2,
-        "type": "array"
-      }
-    },
-    "required": [
-      "services",
-      "generatedAt",
-      "caveat"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "minLength": 1,
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "code",
-          "message"
-        ],
-        "type": "object"
-      },
-      "error_code": {
-        "minLength": 1,
-        "type": "string"
-      }
-    },
-    "required": [
-      "error_code",
-      "error"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "caveat": {
+        "type": "string"
+      },
+      "generatedAt": {
+        "format": "date-time",
+        "type": "string"
+      },
+      "services": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "auth": {
+              "enum": [
+                "api-key",
+                "oauth",
+                "wallet-payment",
+                "none",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "capabilities": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "category": {
+              "enum": [
+                "search",
+                "extraction",
+                "data",
+                "browser",
+                "documents"
+              ],
+              "type": "string"
+            },
+            "color": {
+              "type": "string"
+            },
+            "description": {
+              "type": "string"
+            },
+            "docsUrl": {
+              "type": "string"
+            },
+            "endpoint": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "featured": {
+              "type": "boolean"
+            },
+            "id": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            },
+            "notes": {
+              "type": "string"
+            },
+            "pricing": {
+              "additionalProperties": false,
+              "properties": {
+                "checkedAt": {
+                  "anyOf": [
+                    {
+                      "anyOf": [
+                        {
+                          "format": "date",
+                          "type": "string"
+                        },
+                        {
+                          "format": "date-time",
+                          "type": "string"
+                        }
+                      ]
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "model": {
+                  "enum": [
+                    "free",
+                    "freemium",
+                    "usage-based",
+                    "subscription",
+                    "unknown"
+                  ],
+                  "type": "string"
+                },
+                "summary": {
+                  "type": "string"
+                },
+                "url": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "required": [
+                "model",
+                "summary",
+                "url",
+                "checkedAt"
+              ],
+              "type": "object"
+            },
+            "protocols": {
+              "items": {
+                "enum": [
+                  "MCP",
+                  "REST",
+                  "x402"
+                ],
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "provider": {
+              "type": "string"
+            },
+            "registryName": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "slug": {
+              "type": "string"
+            },
+            "sourceCheckedAt": {
+              "anyOf": [
+                {
+                  "format": "date",
+                  "type": "string"
+                },
+                {
+                  "format": "date-time",
+                  "type": "string"
+                }
+              ]
+            },
+            "sourceType": {
+              "enum": [
+                "registry",
+                "provider"
+              ],
+              "type": "string"
+            },
+            "sourceUrl": {
+              "type": "string"
+            },
+            "tagline": {
+              "type": "string"
+            },
+            "tags": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "verification": {
+              "enum": [
+                "listed",
+                "documented",
+                "connection-tested"
+              ],
+              "type": "string"
+            },
+            "website": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "slug",
+            "name",
+            "provider",
+            "tagline",
+            "description",
+            "website",
+            "docsUrl",
+            "category",
+            "tags",
+            "capabilities",
+            "protocols",
+            "auth",
+            "pricing",
+            "endpoint",
+            "registryName",
+            "sourceUrl",
+            "sourceType",
+            "sourceCheckedAt",
+            "verification",
+            "notes",
+            "featured",
+            "color"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "minItems": 2,
+        "type": "array"
+      }
+    },
+    "required": [
+      "services",
+      "generatedAt",
+      "caveat"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "minLength": 1,
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "code",
+          "message"
+        ],
+        "type": "object"
+      },
+      "error_code": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "recovery": {
+        "additionalProperties": false,
+        "properties": {
+          "automaticRetryAllowed": {
+            "const": false
+          },
+          "guidance": {
+            "type": "string"
+          },
+          "requiredArguments": {
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "tool": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "tool",
+          "requiredArguments",
+          "guidance",
+          "automaticRetryAllowed"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "error_code",
+      "error"
+    ],
+    "type": "object"
+  }
+]
  2. Changed1 schema field changed
    • addedInput schema / properties / slugs / description
      Added value: +"Two or three distinct published service slugs returned by search_services, in the desired comparison order."
  3. Changed4 schema fields changed
    • removedOutput schema / additionalProperties
      Removed value: -false
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "caveat": {
+        "type": "string"
+      },
+      "generatedAt": {
+        "format": "date-time",
+        "type": "string"
+      },
+      "services": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "auth": {
+              "enum": [
+                "api-key",
+                "oauth",
+                "wallet-payment",
+                "none",
+                "unknown"
+              ],
+              "type": "string"
+            },
+            "capabilities": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "category": {
+              "enum": [
+                "search",
+                "extraction",
+                "data",
+                "browser",
+                "documents"
+              ],
+              "type": "string"
+            },
+            "color": {
+              "type": "string"
+            },
+            "description": {
+              "type": "string"
+            },
+            "docsUrl": {
+              "type": "string"
+            },
+            "endpoint": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "featured": {
+              "type": "boolean"
+            },
+            "id": {
+              "type": "string"
+            },
+            "name": {
+              "type": "string"
+            },
+            "notes": {
+              "type": "string"
+            },
+            "pricing": {
+              "additionalProperties": false,
+              "properties": {
+                "checkedAt": {
+                  "anyOf": [
+                    {
+                      "anyOf": [
+                        {
+                          "format": "date",
+                          "type": "string"
+                        },
+                        {
+                          "format": "date-time",
+                          "type": "string"
+                        }
+                      ]
+                    },
+                    {
+                      "type": "null"
+                    }
+                  ]
+                },
+                "model": {
+                  "enum": [
+                    "free",
+                    "freemium",
+                    "usage-based",
+                    "subscription",
+                    "unknown"
+                  ],
+                  "type": "string"
+                },
+                "summary": {
+                  "type": "string"
+                },
+                "url": {
+                  "type": [
+                    "string",
+                    "null"
+                  ]
+                }
+              },
+              "required": [
+                "model",
+                "summary",
+                "url",
+                "checkedAt"
+              ],
+              "type": "object"
+            },
+            "protocols": {
+              "items": {
+                "enum": [
+                  "MCP",
+                  "REST",
+                  "x402"
+                ],
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "provider": {
+              "type": "string"
+            },
+            "registryName": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "slug": {
+              "type": "string"
+            },
+            "sourceCheckedAt": {
+              "anyOf": [
+                {
+                  "format": "date",
+                  "type": "string"
+                },
+                {
+                  "format": "date-time",
+                  "type": "string"
+                }
+              ]
+            },
+            "sourceType": {
+              "enum": [
+                "registry",
+                "provider"
+              ],
+              "type": "string"
+            },
+            "sourceUrl": {
+              "type": "string"
+            },
+            "tagline": {
+              "type": "string"
+            },
+            "tags": {
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
+            "verification": {
+              "enum": [
+                "listed",
+                "documented",
+                "connection-tested"
+              ],
+              "type": "string"
+            },
+            "website": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "slug",
+            "name",
+            "provider",
+            "tagline",
+            "description",
+            "website",
+            "docsUrl",
+            "category",
+            "tags",
+            "capabilities",
+            "protocols",
+            "auth",
+            "pricing",
+            "endpoint",
+            "registryName",
+            "sourceUrl",
+            "sourceType",
+            "sourceCheckedAt",
+            "verification",
+            "notes",
+            "featured",
+            "color"
+          ],
+          "type": "object"
+        },
+        "maxItems": 3,
+        "minItems": 2,
+        "type": "array"
+      }
+    },
+    "required": [
+      "services",
+      "generatedAt",
+      "caveat"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "minLength": 1,
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "code",
+          "message"
+        ],
+        "type": "object"
+      },
+      "error_code": {
+        "minLength": 1,
+        "type": "string"
+      }
+    },
+    "required": [
+      "error_code",
+      "error"
+    ],
+    "type": "object"
+  }
+]
    • removedOutput schema / properties
      Removed value: -{
-  "caveat": {
-    "type": "string"
-  },
-  "generatedAt": {
-    "format": "date-time",
-    "type": "string"
-  },
-  "services": {
-    "items": {
-      "additionalProperties": false,
-      "properties": {
-        "auth": {
-          "enum": [
-            "api-key",
-            "oauth",
-            "none",
-            "unknown"
-          ],
-          "type": "string"
-        },
-        "capabilities": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "category": {
-          "enum": [
-            "search",
-            "extraction",
-            "data",
-            "browser",
-            "documents"
-          ],
-          "type": "string"
-        },
-        "color": {
-          "type": "string"
-        },
-        "description": {
-          "type": "string"
-        },
-        "docsUrl": {
-          "type": "string"
-        },
-        "endpoint": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "featured": {
-          "type": "boolean"
-        },
-        "id": {
-          "type": "string"
-        },
-        "name": {
-          "type": "string"
-        },
-        "notes": {
-          "type": "string"
-        },
-        "pricing": {
-          "additionalProperties": false,
-          "properties": {
-            "checkedAt": {
-              "anyOf": [
-                {
-                  "anyOf": [
-                    {
-                      "format": "date",
-                      "type": "string"
-                    },
-                    {
-                      "format": "date-time",
-                      "type": "string"
-                    }
-                  ]
-                },
-                {
-                  "type": "null"
-                }
-              ]
-            },
-            "model": {
-              "enum": [
-                "free",
-                "freemium",
-                "usage-based",
-                "subscription",
-                "unknown"
-              ],
-              "type": "string"
-            },
-            "summary": {
-              "type": "string"
-            },
-            "url": {
-              "type": [
-                "string",
-                "null"
-              ]
-            }
-          },
-          "required": [
-            "model",
-            "summary",
-            "url",
-            "checkedAt"
-          ],
-          "type": "object"
-        },
-        "protocols": {
-          "items": {
-            "enum": [
-              "MCP",
-              "REST",
-              "x402"
-            ],
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "provider": {
-          "type": "string"
-        },
-        "registryName": {
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "slug": {
-          "type": "string"
-        },
-        "sourceCheckedAt": {
-          "anyOf": [
-            {
-              "format": "date",
-              "type": "string"
-            },
-            {
-              "format": "date-time",
-              "type": "string"
-            }
-          ]
-        },
-        "sourceType": {
-          "enum": [
-            "registry",
-            "provider"
-          ],
-          "type": "string"
-        },
-        "sourceUrl": {
-          "type": "string"
-        },
-        "tagline": {
-          "type": "string"
-        },
-        "tags": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "verification": {
-          "enum": [
-            "listed",
-            "documented",
-            "connection-tested"
-          ],
-          "type": "string"
-        },
-        "website": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "id",
-        "slug",
-        "name",
-        "provider",
-        "tagline",
-        "description",
-        "website",
-        "docsUrl",
-        "category",
-        "tags",
-        "capabilities",
-        "protocols",
-        "auth",
-        "pricing",
-        "endpoint",
-        "registryName",
-        "sourceUrl",
-        "sourceType",
-        "sourceCheckedAt",
-        "verification",
-        "notes",
-        "featured",
-        "color"
-      ],
-      "type": "object"
-    },
-    "maxItems": 3,
-    "minItems": 2,
-    "type": "array"
-  }
-}
    • removedOutput schema / required
      Removed value: -[
-  "services",
-  "generatedAt",
-  "caveat"
-]
  4. First observed

TDQS

A3.8/5.0
Behavior4/5

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

The annotations already establish read-only, idempotent, non-destructive behavior. The description adds a meaningful scope limitation: it does not test providers or infer performance from listings, which is important for setting expectations about what a 'comparison' means here. It does not need to explain return values because an output schema exists.

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

Conciseness5/5

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

The description is two short sentences with no waste. The core retrieval purpose is front-loaded, followed immediately by the key limitation.

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 rich annotations, a 100%-covered single-parameter schema, and an output schema, the description supplies the essential purpose and the main behavioral caveat. It could be slightly more complete by naming the intended workflow or sibling alternative, but nothing critical is missing for correct invocation.

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%, and the schema fully documents the slugs parameter including min/max items, uniqueness, and ordering. The description only reinforces the 2–3 entry count and does not add syntax or selection details beyond the schema, so baseline 3 is appropriate.

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 verb and resource: retrieving 2–3 selected catalogue entries for comparison. It also distinguishes itself from benchmarking or performance inference, which separates it from test/run-oriented siblings. It does not explicitly contrast with get_service or search_services, but the comparison scope is clear.

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 description implies usage by referencing 'selected catalogue entries' and ruling out provider testing, but it never states when to use this instead of get_service, search_services, or find_service_alternatives. The schema's reference to search_services helps, but the description itself gives only indirect guidance.

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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