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Manifold MCP

by com.manifoldmcp
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Get an Amazon product's sellers

amazon_get_sellers
Read-onlyIdempotent

Every seller offering one Amazon product, with price, condition, where it ships from and delivery: who holds the Buy Box and who undercuts it.

Use when: "who sells this ASIN", "are resellers undercutting our price", "is Amazon itself selling this". Not for: the listing, use amazon_get_product. Prices across other stores, use shopping_get_sellers. Returns: Record. asin, title, has_featured_offer (false when no seller holds the Buy Box; rows then start at rank 2), rows[]: rank (1 holds the Buy Box), seller, seller_url (null for Amazon itself), ships_from, price, regular_price, currency, discount_percent, condition, delivery. Cost: 2 credits. Cached 6 hours. Example: {"asin": "B0B41YH9B6"}

Input Schema

NameRequiredDescriptionDefault
asinYesThe 10-character Amazon product id, after /dp/ in the URL.
dry_runNoReturn only meta with the estimate. Costs nothing.
languageNoISO 639-1 language code. Default en.en
locationNoProvider location name or code. Default United States.United States
max_creditsNoRefuse with BudgetExceeded if the estimate is higher.

Output Schema

NameRequiredDescriptionDefault
asinNo
metaYes
rowsNo
errorNo
hintsYes
titleNo
has_featured_offerNoFalse when no offer holds the Buy Box; the rows then start at rank 2.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / properties / meta / properties / credits_remaining / description
      Previous value: -"The workspace's credits left after this call. null when the call did not check the balance (free tools, cache hits, dry runs, tasks) or the balance has no limit."New value: +"The workspace's credits left after this call. null when the call did not check the balance (free tools, cache hits, dry runs, tasks) or the balance has no limit. Leaves out credits held for calls still running, so it can dip during parallel calls and come back; credits_charged is what this call cost."
  2. Changed1 schema field changed
    • addedOutput schema / properties / meta / properties / feedback_request
      Added value: +{
+  "additionalProperties": false,
+  "description": "Once per workspace: after the task, ask the user once for feedback and send any answer with submit_feedback.",
+  "properties": {
+    "message": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "message"
+  ],
+  "type": "object"
+}
  3. Changed1 schema field changed
    • changedOutput schema / properties / meta / properties / credits_notice / description
      Previous value: -"A free workspace is low on credits, at most once a day. Tell the user once."New value: +"The workspace is low on credits, at most once a day. Tell the user once."
  4. Changed15 schema fields changed
    • removedInput schema / $schema
      Removed value: -"https://json-schema.org/draft/2020-12/schema"
    • removedInput schema / properties / max_credits / maximum
      Removed value: -9007199254740991
    • removedInput schema / properties / provider
      Removed value: -{
-  "description": "Provider id. Defaults to the server default for the tool.",
-  "type": "string"
-}
    • removedOutput schema / $schema
      Removed value: -"https://json-schema.org/draft/2020-12/schema"
    • addedOutput schema / properties / error / additionalProperties
      Added value: +{}
    • removedOutput schema / properties / error / oneOf
      Removed value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "BudgetExceeded",
-        "type": "string"
-      },
-      "est_credits": {
-        "type": "number"
-      },
-      "max_credits": {
-        "type": "number"
-      },
-      "message": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "est_credits",
-      "max_credits",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "billing_url": {
-        "type": "string"
-      },
-      "error": {
-        "const": "InsufficientCredits",
-        "type": "string"
-      },
-      "est_credits": {
-        "type": "number"
-      },
-      "message": {
-        "type": "string"
-      },
-      "upgrade_url": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "est_credits",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "NoData",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "InvalidTarget",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "target": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "target",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "InvalidProvider",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "provider": {
-        "type": "string"
-      },
-      "valid_providers": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "error",
-      "provider",
-      "valid_providers",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "ProviderUnavailable",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "provider": {
-        "type": "string"
-      },
-      "retry_after_s": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "error",
-      "provider",
-      "retry_after_s",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "ConcurrencyLimit",
-        "type": "string"
-      },
-      "limit": {
-        "type": "number"
-      },
-      "message": {
-        "type": "string"
-      },
-      "retry_after_s": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "error",
-      "limit",
-      "retry_after_s",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "cap": {
-        "type": "number"
-      },
-      "error": {
-        "const": "SpendCapReached",
-        "type": "string"
-      },
-      "est_credits": {
-        "type": "number"
-      },
-      "message": {
-        "type": "string"
-      },
-      "period": {
-        "enum": [
-          "day",
-          "month"
-        ],
-        "type": "string"
-      },
-      "resets_at": {
-        "type": "string"
-      },
-      "spent": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "error",
-      "period",
-      "cap",
-      "spent",
-      "est_credits",
-      "resets_at",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "TaskFailed",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "task_id": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "task_id",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "const": "TaskPending",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "poll_after_s": {
-        "type": "number"
-      },
-      "task_id": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "task_id",
-      "poll_after_s",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "connect_url": {
-        "type": "string"
-      },
-      "engine": {
-        "type": "string"
-      },
-      "error": {
-        "const": "NotConnected",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "engine",
-      "connect_url",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "engine": {
-        "type": "string"
-      },
-      "error": {
-        "const": "EngineMisconfigured",
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "engine",
-      "message"
-    ],
-    "type": "object"
-  }
-]
    • addedOutput schema / properties / error / properties
      Added value: +{
+  "error": {
+    "enum": [
+      "BudgetExceeded",
+      "InsufficientCredits",
+      "NoData",
+      "InvalidTarget",
+      "InvalidProvider",
+      "ProviderUnavailable",
+      "ConcurrencyLimit",
+      "SpendCapReached",
+      "TaskFailed",
+      "TaskPending",
+      "NotConnected",
+      "EngineMisconfigured"
+    ],
+    "type": "string"
+  },
+  "message": {
+    "type": "string"
+  }
+}
    • addedOutput schema / properties / error / required
      Added value: +[
+  "error",
+  "message"
+]
    • addedOutput schema / properties / error / type
      Added value: +"object"
    • removedOutput schema / properties / errors
      Removed value: -{
-  "description": "Per-input failures of a batch call.",
-  "items": {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "oneOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "BudgetExceeded",
-                "type": "string"
-              },
-              "est_credits": {
-                "type": "number"
-              },
-              "max_credits": {
-                "type": "number"
-              },
-              "message": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "est_credits",
-              "max_credits",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "billing_url": {
-                "type": "string"
-              },
-              "error": {
-                "const": "InsufficientCredits",
-                "type": "string"
-              },
-              "est_credits": {
-                "type": "number"
-              },
-              "message": {
-                "type": "string"
-              },
-              "upgrade_url": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "est_credits",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "NoData",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "InvalidTarget",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              },
-              "target": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "target",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "InvalidProvider",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              },
-              "provider": {
-                "type": "string"
-              },
-              "valid_providers": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              }
-            },
-            "required": [
-              "error",
-              "provider",
-              "valid_providers",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "ProviderUnavailable",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              },
-              "provider": {
-                "type": "string"
-              },
-              "retry_after_s": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "error",
-              "provider",
-              "retry_after_s",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "ConcurrencyLimit",
-                "type": "string"
-              },
-              "limit": {
-                "type": "number"
-              },
-              "message": {
-                "type": "string"
-              },
-              "retry_after_s": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "error",
-              "limit",
-              "retry_after_s",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "cap": {
-                "type": "number"
-              },
-              "error": {
-                "const": "SpendCapReached",
-                "type": "string"
-              },
-              "est_credits": {
-                "type": "number"
-              },
-              "message": {
-                "type": "string"
-              },
-              "period": {
-                "enum": [
-                  "day",
-                  "month"
-                ],
-                "type": "string"
-              },
-              "resets_at": {
-                "type": "string"
-              },
-              "spent": {
-                "type": "number"
-              }
-            },
-            "required": [
-              "error",
-              "period",
-              "cap",
-              "spent",
-              "est_credits",
-              "resets_at",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "TaskFailed",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              },
-              "task_id": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "task_id",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "error": {
-                "const": "TaskPending",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              },
-              "poll_after_s": {
-                "type": "number"
-              },
-              "task_id": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "task_id",
-              "poll_after_s",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "connect_url": {
-                "type": "string"
-              },
-              "engine": {
-                "type": "string"
-              },
-              "error": {
-                "const": "NotConnected",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "engine",
-              "connect_url",
-              "message"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "engine": {
-                "type": "string"
-              },
-              "error": {
-                "const": "EngineMisconfigured",
-                "type": "string"
-              },
-              "message": {
-                "type": "string"
-              }
-            },
-            "required": [
-              "error",
-              "engine",
-              "message"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "input": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "input",
-      "error"
-    ],
-    "type": "object"
-  },
-  "type": "array"
-}
    • changedOutput schema / properties / meta / properties / rows_available / anyOf
      Previous value: -[
-  {
-    "maximum": 9007199254740991,
-    "minimum": -9007199254740991,
-    "type": "integer"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "type": "integer"
+  },
+  {
+    "type": "null"
+  }
+]
    • removedOutput schema / properties / meta / properties / rows_returned / maximum
      Removed value: -9007199254740991
    • removedOutput schema / properties / meta / properties / rows_returned / minimum
      Removed value: --9007199254740991
    • removedOutput schema / properties / rows / items / properties / rank / maximum
      Removed value: -9007199254740991
    • removedOutput schema / properties / rows / items / properties / rank / minimum
      Removed value: --9007199254740991
  5. Changed3 schema fields changed
    • addedOutput schema / properties / meta / properties / credits_notice
      Added value: +{
+  "additionalProperties": false,
+  "description": "A free workspace is low on credits, at most once a day. Tell the user once.",
+  "properties": {
+    "message": {
+      "type": "string"
+    },
+    "resets_at": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "upgrade_url": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "upgrade_url",
+    "resets_at",
+    "message"
+  ],
+  "type": "object"
+}
    • addedOutput schema / properties / meta / properties / credits_remaining
      Added value: +{
+  "description": "The workspace's credits left after this call. null when the call did not check the balance (free tools, cache hits, dry runs, tasks) or the balance has no limit.",
+  "type": [
+    "number",
+    "null"
+  ]
+}
    • changedOutput schema / properties / meta / required
      Previous value: -[
-  "provider",
-  "credits_charged",
-  "est_credits",
-  "cached",
-  "data_as_of",
-  "rows_returned",
-  "rows_available",
-  "cursor",
-  "request_id"
-]New value: +[
+  "provider",
+  "credits_charged",
+  "est_credits",
+  "cached",
+  "data_as_of",
+  "rows_returned",
+  "rows_available",
+  "cursor",
+  "request_id",
+  "credits_remaining"
+]
  6. Changed3 schema fields changed
    • addedOutput schema / properties / has_featured_offer
      Added value: +{
+  "description": "False when no offer holds the Buy Box; the rows then start at rank 2.",
+  "type": "boolean"
+}
    • addedOutput schema / properties / rows / items / properties / regular_price / description
      Added value: +"The struck-through list price, when shown."
    • addedOutput schema / properties / rows / items / properties / seller_url / description
      Added value: +"Null for Amazon itself."
  7. Added

TDQS

A4.7/5.0
Behavior5/5

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

Goes well beyond the annotations (readOnly/openWorld/idempotent) by disclosing the 2-credit cost, a 6-hour cache window, and a non-obvious output behavior: has_featured_offer is false when no Buy Box holder exists and rows then start at rank 2. It also notes seller_url is null for Amazon itself, which prevents misreading the response.

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?

No wasted sentences: purpose first, then Use when / Not for / Returns / Cost / Example in a consistent front-loaded pattern. Each line adds distinct information despite being dense.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Complete for a five-parameter read tool: it explains purpose, when to choose it, when not to, the return shape, cost and caching, plus a working example. With an output schema present, no return-value explanation is missing.

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 schema already documents asin format, dry_run, language, location, and max_credits. The description adds an example ASIN and mentions credit cost, but does not clarify dry_run's zero-cost estimate mode or how max_credits interacts with the stated 2-credit price. Baseline 3 is correct when the schema carries the load.

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 and resource ('Every seller offering one Amazon product') and immediately scopes the output to price, condition, shipping origin, delivery, and Buy Box ownership. This clearly distinguishes it from amazon_get_product and shopping_get_sellers by name.

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

Usage Guidelines5/5

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

Provides explicit 'Use when' triggers ('who sells this ASIN', 'are resellers undercutting our price', 'is Amazon itself selling this') and an explicit 'Not for' clause routing to amazon_get_product for the listing and shopping_get_sellers for other stores. Nothing is inferred.

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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