StockCake

Resize Image (Outpaint)

resize_image

Change an image's aspect ratio by extending the canvas with AI (GPT Image 2.6) — the subject is kept, new area is generated. Charges credits. Output is the model's native size — about 1.5 megapixels, up to 1536 px on the long edge — whatever the source size; the result reports exact dimensions. For print or larger web use, run upscale_image on the result. Waits up to 20 s, then returns a job_id for get_job. Re-sending identical arguments within 2 hours returns the same job (reused: true) instead of charging again. Requires a free StockCake account (the host will prompt to sign in).

Input Schema

Name	Required	Description
`image`	Yes	A StockCake image id (from search_images), one of your own edited image ids (from a previous result), or a job_id. Never a URL.
`prompt`	Yes	What should fill the extended canvas, e.g. 'extend the sandy beach and sky; keep the subject unchanged, do not crop or stretch'
`context`	Yes	In one sentence, what is the user trying to make or find?
`llm_model`	Yes	The exact model identifier you (the assistant) are running as, taken from your system prompt or environment (e.g. "claude-opus-4-8", "gpt-5.2"). Used for analytics only. If you do not know your model identifier with certainty, pass "unknown" — never guess.
`aspect_ratio`	Yes	Target ratio
`conversation_id`	No	Pass the exact conversation_id from the server's previous response, unchanged. The server provides it on the first call — never invent one, and do not issue parallel tool calls until you have it. Keep passing the same conversation_id for the rest of the conversation, including after later user messages or on a different task; do not reset it when the user starts a new request.

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedNov 2, 2026

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "credits_charged": {
-        "type": "number"
-      },
-      "image": {
-        "additionalProperties": false,
-        "properties": {
-          "dimensions": {
-            "anyOf": [
-              {
-                "additionalProperties": false,
-                "properties": {
-                  "height": {
-                    "type": "number"
-                  },
-                  "width": {
-                    "type": "number"
-                  }
-                },
-                "required": [
-                  "width",
-                  "height"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ],
-            "description": "Output pixel size; null when the file could not be probed"
-          },
-          "id": {
-            "description": "Edited image id — pass it to get_image (preview), download_image, or as an image reference",
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "url": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "id",
-          "url",
-          "dimensions"
-        ],
-        "type": "object"
-      },
-      "job_id": {
-        "type": "string"
-      },
-      "status": {
-        "const": "completed",
-        "type": "string"
-      }
-    },
-    "required": [
-      "job_id",
-      "status",
-      "image",
-      "credits_charged"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "credits_charged": {
-        "type": "number"
-      },
-      "job_id": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "pending",
-        "type": "string"
-      }
-    },
-    "required": [
-      "job_id",
-      "status",
-      "credits_charged",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": {},
-    "properties": {
-      "code": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "code",
-      "message"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "credits_charged": {
+        "type": "number"
+      },
+      "image": {
+        "additionalProperties": false,
+        "properties": {
+          "dimensions": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "height": {
+                    "type": "number"
+                  },
+                  "width": {
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "width",
+                  "height"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Output pixel size; null when the file could not be probed"
+          },
+          "id": {
+            "description": "Edited image id — pass it to get_image (preview), download_image, or as an image reference",
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "url": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "url",
+          "dimensions"
+        ],
+        "type": "object"
+      },
+      "job_id": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "reused": {
+        "const": true,
+        "type": "boolean"
+      },
+      "status": {
+        "const": "completed",
+        "type": "string"
+      }
+    },
+    "required": [
+      "job_id",
+      "status",
+      "image",
+      "credits_charged"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "credits_charged": {
+        "type": "number"
+      },
+      "job_id": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "reused": {
+        "const": true,
+        "type": "boolean"
+      },
+      "status": {
+        "const": "pending",
+        "type": "string"
+      }
+    },
+    "required": [
+      "job_id",
+      "status",
+      "credits_charged",
+      "message"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "code",
+      "message"
+    ],
+    "type": "object"
+  }
+]

Changed1 schema field changedOct 10, 2026

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "credits_charged": {
-        "type": "number"
-      },
-      "image": {
-        "additionalProperties": false,
-        "properties": {
-          "id": {
-            "description": "Edited image id — pass it to download_image or as an image reference",
-            "type": [
-              "number",
-              "null"
-            ]
-          },
-          "url": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "id",
-          "url"
-        ],
-        "type": "object"
-      },
-      "job_id": {
-        "type": "string"
-      },
-      "status": {
-        "const": "completed",
-        "type": "string"
-      }
-    },
-    "required": [
-      "job_id",
-      "status",
-      "image",
-      "credits_charged"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "credits_charged": {
-        "type": "number"
-      },
-      "job_id": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      },
-      "status": {
-        "const": "pending",
-        "type": "string"
-      }
-    },
-    "required": [
-      "job_id",
-      "status",
-      "credits_charged",
-      "message"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": {},
-    "properties": {
-      "code": {
-        "type": "string"
-      },
-      "message": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "code",
-      "message"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "credits_charged": {
+        "type": "number"
+      },
+      "image": {
+        "additionalProperties": false,
+        "properties": {
+          "dimensions": {
+            "anyOf": [
+              {
+                "additionalProperties": false,
+                "properties": {
+                  "height": {
+                    "type": "number"
+                  },
+                  "width": {
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "width",
+                  "height"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Output pixel size; null when the file could not be probed"
+          },
+          "id": {
+            "description": "Edited image id — pass it to get_image (preview), download_image, or as an image reference",
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "url": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "id",
+          "url",
+          "dimensions"
+        ],
+        "type": "object"
+      },
+      "job_id": {
+        "type": "string"
+      },
+      "status": {
+        "const": "completed",
+        "type": "string"
+      }
+    },
+    "required": [
+      "job_id",
+      "status",
+      "image",
+      "credits_charged"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "credits_charged": {
+        "type": "number"
+      },
+      "job_id": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      },
+      "status": {
+        "const": "pending",
+        "type": "string"
+      }
+    },
+    "required": [
+      "job_id",
+      "status",
+      "credits_charged",
+      "message"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": {},
+    "properties": {
+      "code": {
+        "type": "string"
+      },
+      "message": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "code",
+      "message"
+    ],
+    "type": "object"
+  }
+]

First observedSep 28, 2026

TDQS

A4.6/5.0

Behavior5/5

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

Goes well beyond the annotations: discloses credit charging, a bounded ~1.5 MP / 1536 px output regardless of source, a 20 s synchronous wait then async job_id handoff, and a 2-hour dedupe window. The dedupe note sits in mild tension with idempotentHint=false, but since the caching is time-bounded and the first call still charges credits, this is a nuance rather than a contradiction.

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?

Front-loaded with the purpose and packed with distinct operational facts, none of which are filler. It is a single dense paragraph, though, so the cost, latency, sizing, and auth facts would scan faster as separate clauses or bullets.

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?

Covers everything an agent needs before calling a credit-charging, open-world generation tool: cost, latency, output size limits, follow-up tool (get_job), escalation path (upscale_image), auth requirement, and dedupe behavior. Return shape is left to the existing output schema, which is appropriate.

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 every parameter (including the unusual llm_model and conversation_id fields) is already documented in the schema. The description adds operational context such as the output dimension behavior but no additional meaning about individual arguments, so the baseline of 3 applies.

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 operation (change aspect ratio by extending the canvas with AI outpainting), names the underlying model, and clarifies that the subject is preserved while new area is generated. It also distinguishes itself from the sibling upscale_image by routing that use case explicitly.

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?

Explicit routing: use upscale_image on the result for print or larger web use, poll get_job when the 20 s wait expires, and note that a free StockCake account is required with a host-side sign-in prompt. It also tells the agent that identical re-sends within 2 hours are deduplicated, which is direct guidance on a non-obvious invocation pattern.

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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