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Shopping Schema Comparison

agentic_shelf_schema_comparator
Read-only

Compares a brand and up to 3 competitors on price, ratings, stock, shipping and returns, sampling one product per store. Missing evidence stays unknown. $0.02 per comparison. One product: universal_product_url_to_json; store audit: muse_agentic_store_readiness_auditor.

Input Schema

NameRequiredDescriptionDefault
domainYesPublic domain without scheme, path or port.
contextNoOptional. A few words on why you are calling this tool. Recorded without your identity to improve the tools; leave out personal data.
competitor_domainsYesOne to three distinct bare public competitor store domains to compare against domain; one product is sampled per store.

Output Schema

NameRequiredDescriptionDefault
codeNo
domainNo
statusNo
storesNo
sandboxNo
comparisonNo
limitationsNo
error_reasonNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • addedInput schema / examples
      Added value: +[
+  {
+    "competitor_domains": [
+      "example.org"
+    ],
+    "domain": "example.com"
+  }
+]
  2. Changed3 schema fields changed
    • removedOutput schema / anyOf
      Removed value: -[
-  {
-    "description": "Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null.",
-    "properties": {
-      "comparison": {
-        "items": {
-          "properties": {
-            "domain": {
-              "type": "string"
-            },
-            "readiness_score": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "structured_fields": {
-              "type": "object"
-            }
-          },
-          "required": [
-            "domain",
-            "readiness_score",
-            "structured_fields"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "domain": {
-        "type": "string"
-      },
-      "error_reason": {
-        "type": "string"
-      },
-      "limitations": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "sandbox": {
-        "additionalProperties": false,
-        "properties": {
-          "demo_domain": {
-            "const": true,
-            "type": "boolean"
-          },
-          "note": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "demo_domain",
-          "note"
-        ],
-        "type": "object"
-      },
-      "status": {
-        "enum": [
-          "ok",
-          "no_data",
-          "unreachable"
-        ],
-        "type": "string"
-      },
-      "stores": {
-        "items": {
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "domain",
-      "status"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "status": {
-        "maximum": 599,
-        "minimum": 400,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "status",
-      "code"
-    ],
-    "type": "object"
-  }
-]
    • addedOutput schema / description
      Added value: +"Fields only; full schema in GET /v1/catalog."
    • addedOutput schema / properties
      Added value: +{
+  "code": {},
+  "comparison": {},
+  "domain": {},
+  "error_reason": {},
+  "limitations": {},
+  "sandbox": {},
+  "status": {},
+  "stores": {}
+}
  3. Changed3 schema fields changed
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "description": "Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null.",
+    "properties": {
+      "comparison": {
+        "items": {
+          "properties": {
+            "domain": {
+              "type": "string"
+            },
+            "readiness_score": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "structured_fields": {
+              "type": "object"
+            }
+          },
+          "required": [
+            "domain",
+            "readiness_score",
+            "structured_fields"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "domain": {
+        "type": "string"
+      },
+      "error_reason": {
+        "type": "string"
+      },
+      "limitations": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "sandbox": {
+        "additionalProperties": false,
+        "properties": {
+          "demo_domain": {
+            "const": true,
+            "type": "boolean"
+          },
+          "note": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "demo_domain",
+          "note"
+        ],
+        "type": "object"
+      },
+      "status": {
+        "enum": [
+          "ok",
+          "no_data",
+          "unreachable"
+        ],
+        "type": "string"
+      },
+      "stores": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "domain",
+      "status"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {
+      "code": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "status": {
+        "maximum": 599,
+        "minimum": 400,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "status",
+      "code"
+    ],
+    "type": "object"
+  }
+]
    • removedOutput schema / description
      Removed value: -"Fields only; full schema in GET /v1/catalog."
    • removedOutput schema / properties
      Removed value: -{
-  "code": {},
-  "comparison": {},
-  "domain": {},
-  "error_reason": {},
-  "limitations": {},
-  "sandbox": {},
-  "status": {},
-  "stores": {}
-}
  4. Changed3 schema fields changed
    • removedOutput schema / anyOf
      Removed value: -[
-  {
-    "description": "Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null.",
-    "properties": {
-      "comparison": {
-        "items": {
-          "properties": {
-            "domain": {
-              "type": "string"
-            },
-            "readiness_score": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "structured_fields": {
-              "type": "object"
-            }
-          },
-          "required": [
-            "domain",
-            "readiness_score",
-            "structured_fields"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "domain": {
-        "type": "string"
-      },
-      "error_reason": {
-        "type": "string"
-      },
-      "limitations": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "sandbox": {
-        "additionalProperties": false,
-        "properties": {
-          "demo_domain": {
-            "const": true,
-            "type": "boolean"
-          },
-          "note": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "demo_domain",
-          "note"
-        ],
-        "type": "object"
-      },
-      "status": {
-        "enum": [
-          "ok",
-          "no_data",
-          "unreachable"
-        ],
-        "type": "string"
-      },
-      "stores": {
-        "items": {
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "domain",
-      "status"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "status": {
-        "maximum": 599,
-        "minimum": 400,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "status",
-      "code"
-    ],
-    "type": "object"
-  }
-]
    • addedOutput schema / description
      Added value: +"Fields only; full schema in GET /v1/catalog."
    • addedOutput schema / properties
      Added value: +{
+  "code": {},
+  "comparison": {},
+  "domain": {},
+  "error_reason": {},
+  "limitations": {},
+  "sandbox": {},
+  "status": {},
+  "stores": {}
+}
  5. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "description": "Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null.",
-    "properties": {
-      "comparison": {
-        "items": {
-          "properties": {
-            "domain": {
-              "type": "string"
-            },
-            "readiness_score": {
-              "type": [
-                "number",
-                "null"
-              ]
-            },
-            "structured_fields": {
-              "type": "object"
-            }
-          },
-          "required": [
-            "domain",
-            "readiness_score",
-            "structured_fields"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "domain": {
-        "type": "string"
-      },
-      "error_reason": {
-        "type": "string"
-      },
-      "limitations": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "status": {
-        "enum": [
-          "ok",
-          "no_data",
-          "unreachable"
-        ],
-        "type": "string"
-      },
-      "stores": {
-        "items": {
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "domain",
-      "status"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": true,
-    "properties": {
-      "code": {
-        "minLength": 1,
-        "type": "string"
-      },
-      "status": {
-        "maximum": 599,
-        "minimum": 400,
-        "type": "integer"
-      }
-    },
-    "required": [
-      "status",
-      "code"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "description": "Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null.",
+    "properties": {
+      "comparison": {
+        "items": {
+          "properties": {
+            "domain": {
+              "type": "string"
+            },
+            "readiness_score": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "structured_fields": {
+              "type": "object"
+            }
+          },
+          "required": [
+            "domain",
+            "readiness_score",
+            "structured_fields"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "domain": {
+        "type": "string"
+      },
+      "error_reason": {
+        "type": "string"
+      },
+      "limitations": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "sandbox": {
+        "additionalProperties": false,
+        "properties": {
+          "demo_domain": {
+            "const": true,
+            "type": "boolean"
+          },
+          "note": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "demo_domain",
+          "note"
+        ],
+        "type": "object"
+      },
+      "status": {
+        "enum": [
+          "ok",
+          "no_data",
+          "unreachable"
+        ],
+        "type": "string"
+      },
+      "stores": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "domain",
+      "status"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {
+      "code": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "status": {
+        "maximum": 599,
+        "minimum": 400,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "status",
+      "code"
+    ],
+    "type": "object"
+  }
+]
  6. Changed2 schema fields changed
    • changedInput schema / properties / competitor_domains / items / examples
      Previous value: -[
-  "example.com"
-]New value: +[
+  "allbirds.com"
+]
    • changedInput schema / properties / domain / examples
      Previous value: -[
-  "example.com"
-]New value: +[
+  "allbirds.com"
+]
  7. Changed1 schema field changed
    • addedInput schema / properties / context
      Added value: +{
+  "description": "Optional. A few words on why you are calling this tool. Recorded without your identity to improve the tools; leave out personal data.",
+  "type": "string"
+}
  8. Changed4 schema fields changed
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "description": "Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null.",
+    "properties": {
+      "comparison": {
+        "items": {
+          "properties": {
+            "domain": {
+              "type": "string"
+            },
+            "readiness_score": {
+              "type": [
+                "number",
+                "null"
+              ]
+            },
+            "structured_fields": {
+              "type": "object"
+            }
+          },
+          "required": [
+            "domain",
+            "readiness_score",
+            "structured_fields"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "domain": {
+        "type": "string"
+      },
+      "error_reason": {
+        "type": "string"
+      },
+      "limitations": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "status": {
+        "enum": [
+          "ok",
+          "no_data",
+          "unreachable"
+        ],
+        "type": "string"
+      },
+      "stores": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "domain",
+      "status"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": true,
+    "properties": {
+      "code": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "status": {
+        "maximum": 599,
+        "minimum": 400,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "status",
+      "code"
+    ],
+    "type": "object"
+  }
+]
    • removedOutput schema / description
      Removed value: -"Only status=ok is charged. Diagnostic results may omit result fields; unknown facts are null."
    • removedOutput schema / properties
      Removed value: -{
-  "comparison": {
-    "items": {
-      "properties": {
-        "domain": {
-          "type": "string"
-        },
-        "readiness_score": {
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "structured_fields": {
-          "type": "object"
-        }
-      },
-      "required": [
-        "domain",
-        "readiness_score",
-        "structured_fields"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "domain": {
-    "type": "string"
-  },
-  "error_reason": {
-    "type": "string"
-  },
-  "limitations": {
-    "items": {
-      "type": "string"
-    },
-    "type": "array"
-  },
-  "status": {
-    "enum": [
-      "ok",
-      "no_data",
-      "unreachable"
-    ],
-    "type": "string"
-  },
-  "stores": {
-    "items": {
-      "type": "object"
-    },
-    "type": "array"
-  }
-}
    • removedOutput schema / required
      Removed value: -[
-  "domain",
-  "status"
-]
  9. Changed1 schema field changed
    • addedInput schema / properties / competitor_domains / description
      Added value: +"One to three distinct bare public competitor store domains to compare against domain; one product is sampled per store."
  10. Added

TDQS

A4.1/5.0
Behavior4/5

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

Annotations already declare readOnlyHint and openWorldHint, and the description adds real value on top: per-call cost ($0.02), the sampling limitation, and the policy that missing evidence is reported as unknown rather than inferred. It does not cover latency, caching, or failure behavior, so it stops short of a 5.

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?

Four short sentences, front-loaded with what is compared and immediately followed by the constraint, cost, and routing hints. The telegraphic 'One product: X; store audit: Y' phrasing is compact but slightly cryptic, keeping it just below a 5.

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?

With annotations, an output schema, and full schema coverage, the description supplies the remaining decision-critical facts: cost, sampling scope, and unknown-evidence handling. Only execution details like timing or per-domain failure behavior are absent, which is acceptable given the output schema exists.

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 the domain/competitor format and limits are already fully documented in the schema. The description only reiterates the 'up to 3 competitors' cap and the one-product-per-store sampling, adding little beyond the schema's maxItems and domain text.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (compares) plus the exact resource and dimensions covered: price, ratings, stock, shipping and returns, for a brand and up to 3 competitors. The sampling rule (one product per store) further pins down scope, so an agent can distinguish this from sibling tools like pre_purchase_merchant_trust_check without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Routes the agent to alternatives for adjacent tasks: single-product lookups go to universal_product_url_to_json, broader store audits to muse_agentic_store_readiness_auditor. It gives clear context for when this comparison tool fits, though it does not explicitly exclude adjacent trust/comparison siblings such as pre_purchase_merchant_trust_check.

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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