Influence

Get upload URLs

mediaUploadPart

Read-onlyIdempotent

Returns up to 32 short-lived PUT URLs for the exact part checksums authorized when this owned upload was created. Use nextPart for later pages or startPart to renew expired URLs. No new confirmation is needed; the file manifest cannot change. Send Content-MD5, never Influence bearer credentials, to storage.

Input Schema

TableJSON Schema

Name	Required	Description
`limit`	No
`uploadId`	Yes
`startPart`	No	First part to sign; defaults to 1. Use nextPart from the previous response to continue or request an earlier part to retry.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 20, 2026

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "ok": {
-        "const": true,
-        "type": "boolean"
-      },
-      "output": {
-        "additionalProperties": false,
-        "properties": {
-          "nextPart": {
-            "anyOf": [
-              {
-                "$ref": "#/$defs/__schema0"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "parts": {
-            "items": {
-              "$ref": "#/$defs/__schema1"
-            },
-            "maxItems": 32,
-            "type": "array"
-          }
-        },
-        "required": [
-          "nextPart",
-          "parts"
-        ],
-        "type": "object"
-      },
-      "toolName": {
-        "const": "mediaUploadPart",
-        "type": "string"
-      }
-    },
-    "required": [
-      "ok",
-      "output",
-      "toolName"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "error": {
-        "additionalProperties": false,
-        "properties": {
-          "code": {
-            "enum": [
-              "INVALID_INPUT",
-              "FORBIDDEN",
-              "NOT_FOUND",
-              "CONFLICT",
-              "FEATURE_DISABLED",
-              "CONFIRMATION_REQUIRED",
-              "CONFIRMATION_INVALID",
-              "UPSTREAM_FAILED",
-              "NEEDS_REVIEW",
-              "INTERNAL"
-            ],
-            "type": "string"
-          },
-          "message": {
-            "maxLength": 2048,
-            "minLength": 1,
-            "type": "string"
-          },
-          "retryable": {
-            "type": "boolean"
-          }
-        },
-        "required": [
-          "code",
-          "message",
-          "retryable"
-        ],
-        "type": "object"
-      },
-      "ok": {
-        "const": false,
-        "type": "boolean"
-      },
-      "toolName": {
-        "const": "mediaUploadPart",
-        "type": "string"
-      }
-    },
-    "required": [
-      "error",
-      "ok",
-      "toolName"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "output": {
+        "additionalProperties": false,
+        "properties": {
+          "nextPart": {
+            "anyOf": [
+              {
+                "$ref": "#/$defs/__schema0"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "parts": {
+            "items": {
+              "$ref": "#/$defs/__schema1"
+            },
+            "maxItems": 32,
+            "type": "array"
+          }
+        },
+        "required": [
+          "nextPart",
+          "parts"
+        ],
+        "type": "object"
+      },
+      "toolName": {
+        "const": "mediaUploadPart",
+        "type": "string"
+      }
+    },
+    "required": [
+      "ok",
+      "output",
+      "toolName"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "enum": [
+              "AI_SCHEDULING_LIMIT_REACHED",
+              "AI_SCHEDULING_UNAVAILABLE",
+              "INVALID_INPUT",
+              "FORBIDDEN",
+              "NOT_FOUND",
+              "CONFLICT",
+              "FEATURE_DISABLED",
+              "CONFIRMATION_REQUIRED",
+              "CONFIRMATION_INVALID",
+              "UPSTREAM_FAILED",
+              "NEEDS_REVIEW",
+              "INTERNAL"
+            ],
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 2048,
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "ok": {
+        "const": false,
+        "type": "boolean"
+      },
+      "toolName": {
+        "const": "mediaUploadPart",
+        "type": "string"
+      }
+    },
+    "required": [
+      "error",
+      "ok",
+      "toolName"
+    ],
+    "type": "object"
+  }
+]

Changed20 schema fields changedOct 19, 2026

removedInput schema / dependentRequired

Removed value: -{
-  "_confirmationCapability": [
-    "_idempotencyKey"
-  ],
-  "_idempotencyKey": [
-    "_confirmationCapability"
-  ]
-}

removedInput schema / properties / _confirmationCapability

Removed value: -{
-  "description": "Value issued by Influence in this tool's preparation result. Return it unchanged before expiresAt to permit one execution of the prepared action. Never invent it; it is not an account credential or proof of human approval.",
-  "maxLength": 4096,
-  "minLength": 32,
-  "pattern": "^[A-Za-z0-9._~-]+$",
-  "type": "string"
-}

removedInput schema / properties / _idempotencyKey

Removed value: -{
-  "description": "Caller-generated retry ID for this confirmed request. Reuse the same value, confirmation capability and inputs when retrying an uncertain result.",
-  "maxLength": 200,
-  "minLength": 16,
-  "pattern": "^[A-Za-z0-9._:-]+$",
-  "type": "string"
-}

removedInput schema / properties / contentMd5Base64

Removed value: -{
-  "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
-  "type": "string"
-}

addedInput schema / properties / limit

Added value: +{
+  "maximum": 32,
+  "minimum": 1,
+  "type": "integer"
+}

removedInput schema / properties / partNumber

Removed value: -{
-  "maximum": 32,
-  "minimum": 1,
-  "type": "integer"
-}

addedInput schema / properties / startPart

Added value: +{
+  "description": "First part to sign; defaults to 1. Use nextPart from the previous response to continue or request an earlier part to retry.",
+  "maximum": 597,
+  "minimum": 1,
+  "type": "integer"
+}

changedInput schema / required

Previous value: -[
-  "uploadId",
-  "contentMd5Base64",
-  "partNumber"
-]New value: +[
+  "uploadId"
+]

removedOutput schema / $defs / __schema0 / anyOf

Removed value: -[
-  {
-    "maxLength": 8192,
-    "type": "string"
-  },
-  {
-    "type": "number"
-  },
-  {
-    "type": "boolean"
-  },
-  {
-    "type": "null"
-  },
-  {
-    "items": {
-      "$ref": "#/$defs/__schema0"
-    },
-    "maxItems": 512,
-    "type": "array"
-  },
-  {
-    "additionalProperties": {
-      "$ref": "#/$defs/__schema0"
-    },
-    "propertyNames": {
-      "$ref": "#/$defs/__schema1"
-    },
-    "type": "object"
-  }
-]

addedOutput schema / $defs / __schema0 / maximum
```
Added value: +597
```
addedOutput schema / $defs / __schema0 / minimum
```
Added value: +1
```
addedOutput schema / $defs / __schema0 / type
```
Added value: +"integer"
```
addedOutput schema / $defs / __schema1 / additionalProperties
```
Added value: +false
```
removedOutput schema / $defs / __schema1 / maxLength
```
Removed value: -128
```
removedOutput schema / $defs / __schema1 / minLength
```
Removed value: -1
```

addedOutput schema / $defs / __schema1 / properties

Added value: +{
+  "contentMd5Base64": {
+    "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
+    "type": "string"
+  },
+  "expiresAt": {
+    "maximum": 9007199254740991,
+    "minimum": 0,
+    "type": "integer"
+  },
+  "method": {
+    "const": "PUT",
+    "type": "string"
+  },
+  "partNumber": {
+    "$ref": "#/$defs/__schema0"
+  },
+  "url": {
+    "format": "uri",
+    "maxLength": 4096,
+    "type": "string"
+  }
+}

addedOutput schema / $defs / __schema1 / required

Added value: +[
+  "contentMd5Base64",
+  "expiresAt",
+  "method",
+  "partNumber",
+  "url"
+]

changedOutput schema / $defs / __schema1 / type

Previous value: -"string"New value: +"object"

removedOutput schema / anyOf

Removed value: -[
-  {
-    "oneOf": [
-      {
-        "additionalProperties": false,
-        "properties": {
-          "ok": {
-            "const": true,
-            "type": "boolean"
-          },
-          "output": {
-            "additionalProperties": false,
-            "properties": {
-              "contentMd5Base64": {
-                "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
-                "type": "string"
-              },
-              "expiresAt": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "method": {
-                "const": "PUT",
-                "type": "string"
-              },
-              "url": {
-                "format": "uri",
-                "maxLength": 4096,
-                "type": "string"
-              }
-            },
-            "required": [
-              "contentMd5Base64",
-              "expiresAt",
-              "method",
-              "url"
-            ],
-            "type": "object"
-          },
-          "toolName": {
-            "const": "mediaUploadPart",
-            "type": "string"
-          }
-        },
-        "required": [
-          "ok",
-          "output",
-          "toolName"
-        ],
-        "type": "object"
-      },
-      {
-        "additionalProperties": false,
-        "properties": {
-          "error": {
-            "additionalProperties": false,
-            "properties": {
-              "code": {
-                "enum": [
-                  "INVALID_INPUT",
-                  "FORBIDDEN",
-                  "NOT_FOUND",
-                  "CONFLICT",
-                  "FEATURE_DISABLED",
-                  "CONFIRMATION_REQUIRED",
-                  "CONFIRMATION_INVALID",
-                  "UPSTREAM_FAILED",
-                  "NEEDS_REVIEW",
-                  "INTERNAL"
-                ],
-                "type": "string"
-              },
-              "message": {
-                "maxLength": 2048,
-                "minLength": 1,
-                "type": "string"
-              },
-              "retryable": {
-                "type": "boolean"
-              }
-            },
-            "required": [
-              "code",
-              "message",
-              "retryable"
-            ],
-            "type": "object"
-          },
-          "ok": {
-            "const": false,
-            "type": "boolean"
-          },
-          "toolName": {
-            "const": "mediaUploadPart",
-            "type": "string"
-          }
-        },
-        "required": [
-          "error",
-          "ok",
-          "toolName"
-        ],
-        "type": "object"
-      }
-    ]
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "confirmationCapability": {
-        "description": "Issued by Influence for this preparation. Return it unchanged as _confirmationCapability before expiresAt to confirm this prepared action; never invent or modify it.",
-        "maxLength": 4096,
-        "minLength": 32,
-        "pattern": "^[A-Za-z0-9._~-]+$",
-        "type": "string"
-      },
-      "expiresAt": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "inputDigest": {
-        "pattern": "^[0-9a-f]{64}$",
-        "type": "string"
-      },
-      "status": {
-        "const": "confirmation_required",
-        "type": "string"
-      },
-      "summary": {
-        "$ref": "#/$defs/__schema0"
-      },
-      "toolName": {
-        "const": "mediaUploadPart",
-        "type": "string"
-      }
-    },
-    "required": [
-      "confirmationCapability",
-      "expiresAt",
-      "inputDigest",
-      "status",
-      "toolName"
-    ],
-    "type": "object"
-  }
-]

addedOutput schema / oneOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "ok": {
+        "const": true,
+        "type": "boolean"
+      },
+      "output": {
+        "additionalProperties": false,
+        "properties": {
+          "nextPart": {
+            "anyOf": [
+              {
+                "$ref": "#/$defs/__schema0"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "parts": {
+            "items": {
+              "$ref": "#/$defs/__schema1"
+            },
+            "maxItems": 32,
+            "type": "array"
+          }
+        },
+        "required": [
+          "nextPart",
+          "parts"
+        ],
+        "type": "object"
+      },
+      "toolName": {
+        "const": "mediaUploadPart",
+        "type": "string"
+      }
+    },
+    "required": [
+      "ok",
+      "output",
+      "toolName"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "enum": [
+              "INVALID_INPUT",
+              "FORBIDDEN",
+              "NOT_FOUND",
+              "CONFLICT",
+              "FEATURE_DISABLED",
+              "CONFIRMATION_REQUIRED",
+              "CONFIRMATION_INVALID",
+              "UPSTREAM_FAILED",
+              "NEEDS_REVIEW",
+              "INTERNAL"
+            ],
+            "type": "string"
+          },
+          "message": {
+            "maxLength": 2048,
+            "minLength": 1,
+            "type": "string"
+          },
+          "retryable": {
+            "type": "boolean"
+          }
+        },
+        "required": [
+          "code",
+          "message",
+          "retryable"
+        ],
+        "type": "object"
+      },
+      "ok": {
+        "const": false,
+        "type": "boolean"
+      },
+      "toolName": {
+        "const": "mediaUploadPart",
+        "type": "string"
+      }
+    },
+    "required": [
+      "error",
+      "ok",
+      "toolName"
+    ],
+    "type": "object"
+  }
+]

Changed2 schema fields changedOct 18, 2026

changedInput schema / properties / _confirmationCapability / description

Previous value: -"Value issued by Influence in this tool's preparation result. Return it unchanged with the exact same inputs before expiresAt to permit one execution. Never invent it; it is not an account credential or proof of human approval."New value: +"Value issued by Influence in this tool's preparation result. Return it unchanged before expiresAt to permit one execution of the prepared action. Never invent it; it is not an account credential or proof of human approval."

changedOutput schema / anyOf

Previous value: -[
-  {
-    "oneOf": [
-      {
-        "additionalProperties": false,
-        "properties": {
-          "ok": {
-            "const": true,
-            "type": "boolean"
-          },
-          "output": {
-            "additionalProperties": false,
-            "properties": {
-              "contentMd5Base64": {
-                "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
-                "type": "string"
-              },
-              "expiresAt": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "method": {
-                "const": "PUT",
-                "type": "string"
-              },
-              "url": {
-                "format": "uri",
-                "maxLength": 4096,
-                "type": "string"
-              }
-            },
-            "required": [
-              "contentMd5Base64",
-              "expiresAt",
-              "method",
-              "url"
-            ],
-            "type": "object"
-          },
-          "toolName": {
-            "const": "mediaUploadPart",
-            "type": "string"
-          }
-        },
-        "required": [
-          "ok",
-          "output",
-          "toolName"
-        ],
-        "type": "object"
-      },
-      {
-        "additionalProperties": false,
-        "properties": {
-          "error": {
-            "additionalProperties": false,
-            "properties": {
-              "code": {
-                "enum": [
-                  "INVALID_INPUT",
-                  "FORBIDDEN",
-                  "NOT_FOUND",
-                  "CONFLICT",
-                  "FEATURE_DISABLED",
-                  "CONFIRMATION_REQUIRED",
-                  "CONFIRMATION_INVALID",
-                  "UPSTREAM_FAILED",
-                  "NEEDS_REVIEW",
-                  "INTERNAL"
-                ],
-                "type": "string"
-              },
-              "message": {
-                "maxLength": 2048,
-                "minLength": 1,
-                "type": "string"
-              },
-              "retryable": {
-                "type": "boolean"
-              }
-            },
-            "required": [
-              "code",
-              "message",
-              "retryable"
-            ],
-            "type": "object"
-          },
-          "ok": {
-            "const": false,
-            "type": "boolean"
-          },
-          "toolName": {
-            "const": "mediaUploadPart",
-            "type": "string"
-          }
-        },
-        "required": [
-          "error",
-          "ok",
-          "toolName"
-        ],
-        "type": "object"
-      }
-    ]
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "confirmationCapability": {
-        "description": "Issued by Influence for this preparation. Return it unchanged as _confirmationCapability with the exact same tool inputs before expiresAt; never invent or modify it.",
-        "maxLength": 4096,
-        "minLength": 32,
-        "pattern": "^[A-Za-z0-9._~-]+$",
-        "type": "string"
-      },
-      "expiresAt": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "inputDigest": {
-        "pattern": "^[0-9a-f]{64}$",
-        "type": "string"
-      },
-      "status": {
-        "const": "confirmation_required",
-        "type": "string"
-      },
-      "summary": {
-        "$ref": "#/$defs/__schema0"
-      },
-      "toolName": {
-        "const": "mediaUploadPart",
-        "type": "string"
-      }
-    },
-    "required": [
-      "confirmationCapability",
-      "expiresAt",
-      "inputDigest",
-      "status",
-      "toolName"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "oneOf": [
+      {
+        "additionalProperties": false,
+        "properties": {
+          "ok": {
+            "const": true,
+            "type": "boolean"
+          },
+          "output": {
+            "additionalProperties": false,
+            "properties": {
+              "contentMd5Base64": {
+                "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
+                "type": "string"
+              },
+              "expiresAt": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "method": {
+                "const": "PUT",
+                "type": "string"
+              },
+              "url": {
+                "format": "uri",
+                "maxLength": 4096,
+                "type": "string"
+              }
+            },
+            "required": [
+              "contentMd5Base64",
+              "expiresAt",
+              "method",
+              "url"
+            ],
+            "type": "object"
+          },
+          "toolName": {
+            "const": "mediaUploadPart",
+            "type": "string"
+          }
+        },
+        "required": [
+          "ok",
+          "output",
+          "toolName"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "error": {
+            "additionalProperties": false,
+            "properties": {
+              "code": {
+                "enum": [
+                  "INVALID_INPUT",
+                  "FORBIDDEN",
+                  "NOT_FOUND",
+                  "CONFLICT",
+                  "FEATURE_DISABLED",
+                  "CONFIRMATION_REQUIRED",
+                  "CONFIRMATION_INVALID",
+                  "UPSTREAM_FAILED",
+                  "NEEDS_REVIEW",
+                  "INTERNAL"
+                ],
+                "type": "string"
+              },
+              "message": {
+                "maxLength": 2048,
+                "minLength": 1,
+                "type": "string"
+              },
+              "retryable": {
+                "type": "boolean"
+              }
+            },
+            "required": [
+              "code",
+              "message",
+              "retryable"
+            ],
+            "type": "object"
+          },
+          "ok": {
+            "const": false,
+            "type": "boolean"
+          },
+          "toolName": {
+            "const": "mediaUploadPart",
+            "type": "string"
+          }
+        },
+        "required": [
+          "error",
+          "ok",
+          "toolName"
+        ],
+        "type": "object"
+      }
+    ]
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "confirmationCapability": {
+        "description": "Issued by Influence for this preparation. Return it unchanged as _confirmationCapability before expiresAt to confirm this prepared action; never invent or modify it.",
+        "maxLength": 4096,
+        "minLength": 32,
+        "pattern": "^[A-Za-z0-9._~-]+$",
+        "type": "string"
+      },
+      "expiresAt": {
+        "format": "date-time",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+        "type": "string"
+      },
+      "inputDigest": {
+        "pattern": "^[0-9a-f]{64}$",
+        "type": "string"
+      },
+      "status": {
+        "const": "confirmation_required",
+        "type": "string"
+      },
+      "summary": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "toolName": {
+        "const": "mediaUploadPart",
+        "type": "string"
+      }
+    },
+    "required": [
+      "confirmationCapability",
+      "expiresAt",
+      "inputDigest",
+      "status",
+      "toolName"
+    ],
+    "type": "object"
+  }
+]

Changed3 schema fields changedOct 18, 2026

changedInput schema / properties / _confirmationCapability / description

Previous value: -"Single-use from prepare."New value: +"Value issued by Influence in this tool's preparation result. Return it unchanged with the exact same inputs before expiresAt to permit one execution. Never invent it; it is not an account credential or proof of human approval."

changedInput schema / properties / _idempotencyKey / description

Previous value: -"Caller-generated."New value: +"Caller-generated retry ID for this confirmed request. Reuse the same value, confirmation capability and inputs when retrying an uncertain result."

changedOutput schema / anyOf

Previous value: -[
-  {
-    "oneOf": [
-      {
-        "additionalProperties": false,
-        "properties": {
-          "ok": {
-            "const": true,
-            "type": "boolean"
-          },
-          "output": {
-            "additionalProperties": false,
-            "properties": {
-              "contentMd5Base64": {
-                "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
-                "type": "string"
-              },
-              "expiresAt": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "method": {
-                "const": "PUT",
-                "type": "string"
-              },
-              "url": {
-                "format": "uri",
-                "maxLength": 4096,
-                "type": "string"
-              }
-            },
-            "required": [
-              "contentMd5Base64",
-              "expiresAt",
-              "method",
-              "url"
-            ],
-            "type": "object"
-          },
-          "toolName": {
-            "const": "mediaUploadPart",
-            "type": "string"
-          }
-        },
-        "required": [
-          "ok",
-          "output",
-          "toolName"
-        ],
-        "type": "object"
-      },
-      {
-        "additionalProperties": false,
-        "properties": {
-          "error": {
-            "additionalProperties": false,
-            "properties": {
-              "code": {
-                "enum": [
-                  "INVALID_INPUT",
-                  "FORBIDDEN",
-                  "NOT_FOUND",
-                  "CONFLICT",
-                  "FEATURE_DISABLED",
-                  "CONFIRMATION_REQUIRED",
-                  "CONFIRMATION_INVALID",
-                  "UPSTREAM_FAILED",
-                  "NEEDS_REVIEW",
-                  "INTERNAL"
-                ],
-                "type": "string"
-              },
-              "message": {
-                "maxLength": 2048,
-                "minLength": 1,
-                "type": "string"
-              },
-              "retryable": {
-                "type": "boolean"
-              }
-            },
-            "required": [
-              "code",
-              "message",
-              "retryable"
-            ],
-            "type": "object"
-          },
-          "ok": {
-            "const": false,
-            "type": "boolean"
-          },
-          "toolName": {
-            "const": "mediaUploadPart",
-            "type": "string"
-          }
-        },
-        "required": [
-          "error",
-          "ok",
-          "toolName"
-        ],
-        "type": "object"
-      }
-    ]
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "confirmationCapability": {
-        "maxLength": 4096,
-        "minLength": 32,
-        "pattern": "^[A-Za-z0-9._~-]+$",
-        "type": "string"
-      },
-      "expiresAt": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "inputDigest": {
-        "pattern": "^[0-9a-f]{64}$",
-        "type": "string"
-      },
-      "status": {
-        "const": "confirmation_required",
-        "type": "string"
-      },
-      "summary": {
-        "$ref": "#/$defs/__schema0"
-      },
-      "toolName": {
-        "const": "mediaUploadPart",
-        "type": "string"
-      }
-    },
-    "required": [
-      "confirmationCapability",
-      "expiresAt",
-      "inputDigest",
-      "status",
-      "toolName"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "oneOf": [
+      {
+        "additionalProperties": false,
+        "properties": {
+          "ok": {
+            "const": true,
+            "type": "boolean"
+          },
+          "output": {
+            "additionalProperties": false,
+            "properties": {
+              "contentMd5Base64": {
+                "pattern": "^[A-Za-z0-9+/]{21}[AQgw]==$",
+                "type": "string"
+              },
+              "expiresAt": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "method": {
+                "const": "PUT",
+                "type": "string"
+              },
+              "url": {
+                "format": "uri",
+                "maxLength": 4096,
+                "type": "string"
+              }
+            },
+            "required": [
+              "contentMd5Base64",
+              "expiresAt",
+              "method",
+              "url"
+            ],
+            "type": "object"
+          },
+          "toolName": {
+            "const": "mediaUploadPart",
+            "type": "string"
+          }
+        },
+        "required": [
+          "ok",
+          "output",
+          "toolName"
+        ],
+        "type": "object"
+      },
+      {
+        "additionalProperties": false,
+        "properties": {
+          "error": {
+            "additionalProperties": false,
+            "properties": {
+              "code": {
+                "enum": [
+                  "INVALID_INPUT",
+                  "FORBIDDEN",
+                  "NOT_FOUND",
+                  "CONFLICT",
+                  "FEATURE_DISABLED",
+                  "CONFIRMATION_REQUIRED",
+                  "CONFIRMATION_INVALID",
+                  "UPSTREAM_FAILED",
+                  "NEEDS_REVIEW",
+                  "INTERNAL"
+                ],
+                "type": "string"
+              },
+              "message": {
+                "maxLength": 2048,
+                "minLength": 1,
+                "type": "string"
+              },
+              "retryable": {
+                "type": "boolean"
+              }
+            },
+            "required": [
+              "code",
+              "message",
+              "retryable"
+            ],
+            "type": "object"
+          },
+          "ok": {
+            "const": false,
+            "type": "boolean"
+          },
+          "toolName": {
+            "const": "mediaUploadPart",
+            "type": "string"
+          }
+        },
+        "required": [
+          "error",
+          "ok",
+          "toolName"
+        ],
+        "type": "object"
+      }
+    ]
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "confirmationCapability": {
+        "description": "Issued by Influence for this preparation. Return it unchanged as _confirmationCapability with the exact same tool inputs before expiresAt; never invent or modify it.",
+        "maxLength": 4096,
+        "minLength": 32,
+        "pattern": "^[A-Za-z0-9._~-]+$",
+        "type": "string"
+      },
+      "expiresAt": {
+        "format": "date-time",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+        "type": "string"
+      },
+      "inputDigest": {
+        "pattern": "^[0-9a-f]{64}$",
+        "type": "string"
+      },
+      "status": {
+        "const": "confirmation_required",
+        "type": "string"
+      },
+      "summary": {
+        "$ref": "#/$defs/__schema0"
+      },
+      "toolName": {
+        "const": "mediaUploadPart",
+        "type": "string"
+      }
+    },
+    "required": [
+      "confirmationCapability",
+      "expiresAt",
+      "inputDigest",
+      "status",
+      "toolName"
+    ],
+    "type": "object"
+  }
+]

AddedOct 18, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Annotations already mark this as read-only, idempotent, open-world, and non-destructive. The description adds useful behavioral context: URLs are short-lived, tied to exact part checksums, manifest cannot change, and storage requests need Content-MD5 and not bearer credentials.

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 core return behavior is front-loaded and the description is compact. The final sentence is terse but garbled ('never Influence bearer credentials'), which slightly reduces clarity.

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 an output schema and rich annotations present, the description supplies the main operational context: short-lived URLs, paging/renewal, immutable manifest, and request security. Minor ambiguity around nextPart and the garbled credential phrase keeps it from being fully complete.

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 coverage is only 33%, so the description should compensate more. It clarifies limit is capped at 32 and startPart can renew expired URLs, but uploadId is only implied via 'owned upload' and the final security instruction is garbled.

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?

States a specific verb/resource: returns short-lived PUT URLs for authorized upload parts of an owned upload. It is clearly distinguishable from generic media upload tools, though it does not explicitly name sibling alternatives beyond paging behavior.

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?

Gives concrete guidance: use nextPart for later pages, startPart to renew expired URLs, and no new confirmation is needed. It lacks explicit when-not-to-use guidance or direct sibling comparisons, but the key operational context is present.

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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