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by ai.fluxmail.cloud
OverviewDiscussionsAdmin

Update draft

update_draft
DestructiveIdempotent

Replace the content of an existing draft. This is a full replacement, not a patch. Cloud limits bodyText and bodyHtml to 32,768 characters each and attachments to 30 per draft.

Input Schema

NameRequiredDescriptionDefault
ccNoRecipients, each "Name <a@x.com>" or "a@x.com"
toNoRecipients, each "Name <a@x.com>" or "a@x.com"
bccNoRecipients, each "Name <a@x.com>" or "a@x.com"
fromNoConnected address or an available send-as address
draftIdYes
subjectNoDefaults to "Re: ..." when replying
bodyHtmlNoHTML body
bodyTextNoPlain-text body. Line breaks appear in the sent email. Keep each prose paragraph on one continuous line and separate paragraphs with blank lines.
replyAllNoWith replyToMessageId: reply to all original recipients
accountIdNoAccount to operate on. Optional when exactly one account is connected.
attachmentsNo
replyToMessageIdNoMessage being replied to; threads correctly and computes recipients if "to" is omitted

Output Schema

NameRequiredDescriptionDefault
dataYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "data": {
+      "additionalProperties": true,
+      "properties": {
+        "accountId": {
+          "type": "string"
+        },
+        "attachments": {
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "filename": {
+                "type": "string"
+              },
+              "id": {
+                "type": "string"
+              },
+              "mimeType": {
+                "type": "string"
+              },
+              "sizeBytes": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "id",
+              "filename",
+              "mimeType",
+              "sizeBytes"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "body": {
+          "additionalProperties": false,
+          "properties": {
+            "html": {
+              "type": "string"
+            },
+            "text": {
+              "type": "string"
+            }
+          },
+          "type": "object"
+        },
+        "bodyTruncation": {
+          "additionalProperties": {
+            "additionalProperties": false,
+            "properties": {
+              "nextOffset": {
+                "type": "number"
+              },
+              "totalChars": {
+                "type": "number"
+              }
+            },
+            "required": [
+              "totalChars"
+            ],
+            "type": "object"
+          },
+          "type": "object"
+        },
+        "date": {
+          "type": "string"
+        },
+        "flags": {
+          "additionalProperties": true,
+          "properties": {
+            "draft": {
+              "type": "boolean"
+            },
+            "read": {
+              "type": "boolean"
+            },
+            "starred": {
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "read",
+            "starred",
+            "draft"
+          ],
+          "type": "object"
+        },
+        "id": {
+          "type": "string"
+        },
+        "subject": {
+          "type": "string"
+        },
+        "threadId": {
+          "type": "string"
+        },
+        "to": {
+          "items": {
+            "additionalProperties": true,
+            "properties": {
+              "email": {
+                "type": "string"
+              },
+              "name": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "email"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "id",
+        "threadId",
+        "accountId",
+        "to",
+        "subject",
+        "date",
+        "flags"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "data"
+  ],
+  "type": "object"
+}
  2. Changed9 schema fields changed
    • changedInput schema / properties / accountId / anyOf
      Previous value: -[
-  {
-    "minLength": 1,
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "maxLength": 512,
+    "minLength": 1,
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedInput schema / properties / attachments / anyOf
      Previous value: -[
-  {
-    "items": {
-      "additionalProperties": false,
-      "properties": {
-        "content": {
-          "description": "base64",
-          "type": "string"
-        },
-        "contentId": {
-          "description": "Content-ID for an inline image, referenced from bodyHtml as cid:<contentId>",
-          "minLength": 1,
-          "type": "string"
-        },
-        "disposition": {
-          "description": "Defaults to attachment",
-          "enum": [
-            "inline",
-            "attachment"
-          ],
-          "type": "string"
-        },
-        "filename": {
-          "minLength": 1,
-          "type": "string"
-        },
-        "mimeType": {
-          "minLength": 1,
-          "type": "string"
-        }
-      },
-      "required": [
-        "filename",
-        "mimeType",
-        "content"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "items": {
+      "additionalProperties": false,
+      "properties": {
+        "content": {
+          "description": "base64",
+          "type": "string"
+        },
+        "contentId": {
+          "description": "Content-ID for an inline image, referenced from bodyHtml as cid:<contentId>",
+          "maxLength": 255,
+          "minLength": 1,
+          "type": "string"
+        },
+        "disposition": {
+          "description": "Defaults to attachment",
+          "enum": [
+            "inline",
+            "attachment"
+          ],
+          "type": "string"
+        },
+        "filename": {
+          "maxLength": 255,
+          "minLength": 1,
+          "type": "string"
+        },
+        "mimeType": {
+          "maxLength": 255,
+          "minLength": 1,
+          "type": "string"
+        }
+      },
+      "required": [
+        "filename",
+        "mimeType",
+        "content"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedInput schema / properties / bcc / anyOf
      Previous value: -[
-  {
-    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
-    "items": {
-      "minLength": 1,
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
+    "items": {
+      "maxLength": 512,
+      "minLength": 1,
+      "type": "string"
+    },
+    "maxItems": 100,
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • changedInput schema / properties / cc / anyOf
      Previous value: -[
-  {
-    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
-    "items": {
-      "minLength": 1,
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
+    "items": {
+      "maxLength": 512,
+      "minLength": 1,
+      "type": "string"
+    },
+    "maxItems": 100,
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / draftId / maxLength
      Added value: +512
    • changedInput schema / properties / replyToMessageId / anyOf
      Previous value: -[
-  {
-    "minLength": 1,
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "maxLength": 512,
+    "minLength": 1,
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / subject / anyOf
      Added value: +[
+  {
+    "maxLength": 998,
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
    • removedInput schema / properties / subject / type
      Removed value: -[
-  "string",
-  "null"
-]
    • changedInput schema / properties / to / anyOf
      Previous value: -[
-  {
-    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
-    "items": {
-      "minLength": 1,
-      "type": "string"
-    },
-    "type": "array"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
+    "items": {
+      "maxLength": 512,
+      "minLength": 1,
+      "type": "string"
+    },
+    "maxItems": 100,
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
  3. Changed47 schema fields changed
    • changedInput schema / $schema
      Previous value: -"https://json-schema.org/draft/2020-12/schema"New value: +"http://json-schema.org/draft-07/schema#"
    • addedInput schema / properties / accountId / anyOf
      Added value: +[
+  {
+    "minLength": 1,
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / accountId / description
      Added value: +"Account to operate on. Optional when exactly one account is connected."
    • removedInput schema / properties / accountId / maxLength
      Removed value: -512
    • removedInput schema / properties / accountId / minLength
      Removed value: -1
    • removedInput schema / properties / accountId / type
      Removed value: -"string"
    • addedInput schema / properties / attachments / anyOf
      Added value: +[
+  {
+    "items": {
+      "additionalProperties": false,
+      "properties": {
+        "content": {
+          "description": "base64",
+          "type": "string"
+        },
+        "contentId": {
+          "description": "Content-ID for an inline image, referenced from bodyHtml as cid:<contentId>",
+          "minLength": 1,
+          "type": "string"
+        },
+        "disposition": {
+          "description": "Defaults to attachment",
+          "enum": [
+            "inline",
+            "attachment"
+          ],
+          "type": "string"
+        },
+        "filename": {
+          "minLength": 1,
+          "type": "string"
+        },
+        "mimeType": {
+          "minLength": 1,
+          "type": "string"
+        }
+      },
+      "required": [
+        "filename",
+        "mimeType",
+        "content"
+      ],
+      "type": "object"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • removedInput schema / properties / attachments / items
      Removed value: -{
-  "additionalProperties": false,
-  "properties": {
-    "content": {
-      "type": "string"
-    },
-    "contentId": {
-      "maxLength": 255,
-      "type": "string"
-    },
-    "disposition": {
-      "enum": [
-        "inline",
-        "attachment"
-      ],
-      "type": "string"
-    },
-    "filename": {
-      "maxLength": 255,
-      "minLength": 1,
-      "type": "string"
-    },
-    "mimeType": {
-      "maxLength": 255,
-      "minLength": 1,
-      "type": "string"
-    }
-  },
-  "required": [
-    "filename",
-    "mimeType",
-    "content"
-  ],
-  "type": "object"
-}
    • removedInput schema / properties / attachments / maxItems
      Removed value: -30
    • removedInput schema / properties / attachments / type
      Removed value: -"array"
    • addedInput schema / properties / bcc / anyOf
      Added value: +[
+  {
+    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
+    "items": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / bcc / description
      Added value: +"Recipients, each \"Name <a@x.com>\" or \"a@x.com\""
    • removedInput schema / properties / bcc / items
      Removed value: -{
-  "maxLength": 512,
-  "minLength": 1,
-  "type": "string"
-}
    • removedInput schema / properties / bcc / maxItems
      Removed value: -100
    • removedInput schema / properties / bcc / type
      Removed value: -"array"
    • addedInput schema / properties / bodyHtml / description
      Added value: +"HTML body"
    • removedInput schema / properties / bodyHtml / maxLength
      Removed value: -32768
    • changedInput schema / properties / bodyHtml / type
      Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
    • addedInput schema / properties / bodyText / description
      Added value: +"Plain-text body. Line breaks appear in the sent email. Keep each prose paragraph on one continuous line and separate paragraphs with blank lines."
    • removedInput schema / properties / bodyText / maxLength
      Removed value: -32768
    • changedInput schema / properties / bodyText / type
      Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
    • addedInput schema / properties / cc / anyOf
      Added value: +[
+  {
+    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
+    "items": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / cc / description
      Added value: +"Recipients, each \"Name <a@x.com>\" or \"a@x.com\""
    • removedInput schema / properties / cc / items
      Removed value: -{
-  "maxLength": 512,
-  "minLength": 1,
-  "type": "string"
-}
    • removedInput schema / properties / cc / maxItems
      Removed value: -100
    • removedInput schema / properties / cc / type
      Removed value: -"array"
    • removedInput schema / properties / draftId / maxLength
      Removed value: -512
    • addedInput schema / properties / from / anyOf
      Added value: +[
+  {
+    "format": "email",
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / from / description
      Added value: +"Connected address or an available send-as address"
    • removedInput schema / properties / from / format
      Removed value: -"email"
    • removedInput schema / properties / from / pattern
      Removed value: -"^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_'+\\-\\.]*)[A-Za-z0-9_+-]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
    • removedInput schema / properties / from / type
      Removed value: -"string"
    • addedInput schema / properties / replyAll / description
      Added value: +"With replyToMessageId: reply to all original recipients"
    • changedInput schema / properties / replyAll / type
      Previous value: -"boolean"New value: +[
+  "boolean",
+  "null"
+]
    • addedInput schema / properties / replyToMessageId / anyOf
      Added value: +[
+  {
+    "minLength": 1,
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / replyToMessageId / description
      Added value: +"Message being replied to; threads correctly and computes recipients if \"to\" is omitted"
    • removedInput schema / properties / replyToMessageId / maxLength
      Removed value: -512
    • removedInput schema / properties / replyToMessageId / minLength
      Removed value: -1
    • removedInput schema / properties / replyToMessageId / type
      Removed value: -"string"
    • addedInput schema / properties / subject / description
      Added value: +"Defaults to \"Re: ...\" when replying"
    • removedInput schema / properties / subject / maxLength
      Removed value: -998
    • changedInput schema / properties / subject / type
      Previous value: -"string"New value: +[
+  "string",
+  "null"
+]
    • addedInput schema / properties / to / anyOf
      Added value: +[
+  {
+    "description": "Recipients, each \"Name <a@x.com>\" or \"a@x.com\"",
+    "items": {
+      "minLength": 1,
+      "type": "string"
+    },
+    "type": "array"
+  },
+  {
+    "type": "null"
+  }
+]
    • addedInput schema / properties / to / description
      Added value: +"Recipients, each \"Name <a@x.com>\" or \"a@x.com\""
    • removedInput schema / properties / to / items
      Removed value: -{
-  "maxLength": 512,
-  "minLength": 1,
-  "type": "string"
-}
    • removedInput schema / properties / to / maxItems
      Removed value: -100
    • removedInput schema / properties / to / type
      Removed value: -"array"
  4. Changed1 schema field changed
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
  5. First observed

TDQS

A4/5.0
Behavior4/5

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

Annotations already flag destructiveHint=true and idempotentHint=true, but the description adds the crucial behavioral detail behind that flag: this is a full replacement, so fields not supplied are effectively overwritten. It also discloses concrete service limits (32,768 chars per body, 30 attachments), which annotations cannot convey.

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?

Three short sentences, zero filler, and the replacement semantics are front-loaded immediately after the one-line purpose. Every sentence carries information an agent needs.

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?

For a mutation tool with an output schema and annotations already declaring destructive and idempotent behavior, the description covers the two things that matter most: that omission means removal, and the size caps that will cause failures. Nothing essential to calling it correctly is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is already 83%, so the baseline is 3. The description earns an extra point by documenting limits the schema does not encode — bodyText/bodyHtml caps and a 30-attachment ceiling where the attachments array has no maxItems in the schema.

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 ("Replace the content of an existing draft"), which distinguishes it cleanly from create_draft and get_draft in the sibling list. It does not explicitly name a sibling, so it stops short of a 5.

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

Usage Guidelines3/5

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

The "full replacement, not a patch" line is useful usage guidance for how to call it, but the description never says when to reach for this versus create_draft (new draft) or get_draft (read one), and lists no exclusions or prerequisites such as needing an existing draftId.

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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