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Forward email

forward_message
Destructive

Forward a message to recipients the assignment authorizes, with an optional note. Its original bodies, quoted history and files go as stored, so check what they disclose. Starts a new conversation.

Input Schema

NameRequiredDescriptionDefault
ccNo
toYes
bccNo
noteNoPlain-text note placed before the original content.
labelsNo
inbox_idYesInbox to send from; it must hold the source message.
message_idYesReady received or accepted sent message in this inbox. Its Bcc recipients are not shown in the forward.
idempotency_keyNoMakes a retry safe: repeating the call with the same key and identical arguments within 24 hours of the first request returns the original attempt instead of sending again. Use a new key for each intended email.
include_attachmentsNoDefaults to true, including embedded images. false leaves out every original file, embedded images too.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed5 schema fields changed
    • changedInput schema / properties / idempotency_key / description
      Previous value: -"Use a unique key per intended email. Retain the key, exact payload and first request time; reuse only for that attempt within 24 hours, even if the source is later deleted."New value: +"Makes a retry safe: repeating the call with the same key and identical arguments within 24 hours of the first request returns the original attempt instead of sending again. Use a new key for each intended email."
    • changedInput schema / properties / inbox_id / description
      Previous value: -"Sending inbox; must own the source message."New value: +"Inbox to send from; it must hold the source message."
    • changedInput schema / properties / include_attachments / description
      Previous value: -"Defaults to true, including embedded images. Set false to exclude all original files; embedded images may then be unavailable. Missing or oversized included files fail rather than being silently dropped."New value: +"Defaults to true, including embedded images. false leaves out every original file, embedded images too."
    • changedInput schema / properties / message_id / description
      Previous value: -"Ready received or accepted sent message in this inbox. Original bodies are forwarded, not extracted reply text; generated headers exclude Bcc."New value: +"Ready received or accepted sent message in this inbox. Its Bcc recipients are not shown in the forward."
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "idempotency_expires_at": {
-        "description": "End of retry-key protection. Retrying an uncertain send after this instant can send it again.",
-        "type": "string"
-      },
-      "limited": {
-        "const": false,
-        "type": "boolean"
-      },
-      "message": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "const": "accepted",
-                "description": "Accepted by the email provider, not confirmation of delivery.",
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "guidance": {
-                "type": "string"
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "enum": [
-                  "rejected",
-                  "unknown"
-                ],
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status",
-              "guidance"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "outcome_persisted": {
-        "const": true,
-        "type": "boolean"
-      },
-      "replayed": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "limited",
-      "message",
-      "outcome_persisted"
-    ],
-    "type": "object"
-  },
-  {
-    "additionalProperties": false,
-    "properties": {
-      "guidance": {
-        "type": "string"
-      },
-      "idempotency_expires_at": {
-        "description": "End of retry-key protection. Retrying an uncertain send after this instant can send it again.",
-        "type": "string"
-      },
-      "limited": {
-        "const": false,
-        "type": "boolean"
-      },
-      "message": {
-        "anyOf": [
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "const": "accepted",
-                "description": "Accepted by the email provider, not confirmation of delivery.",
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status"
-            ],
-            "type": "object"
-          },
-          {
-            "additionalProperties": false,
-            "properties": {
-              "created_at": {
-                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
-                "type": "string"
-              },
-              "error_code": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "guidance": {
-                "type": "string"
-              },
-              "id": {
-                "type": "string"
-              },
-              "in_reply_to": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "inbox_id": {
-                "type": "string"
-              },
-              "labels": {
-                "items": {
-                  "type": "string"
-                },
-                "type": "array"
-              },
-              "recipient_count": {
-                "maximum": 9007199254740991,
-                "minimum": 0,
-                "type": "integer"
-              },
-              "status": {
-                "enum": [
-                  "rejected",
-                  "unknown"
-                ],
-                "type": "string"
-              },
-              "thread_id": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "required": [
-              "id",
-              "inbox_id",
-              "thread_id",
-              "created_at",
-              "recipient_count",
-              "error_code",
-              "in_reply_to",
-              "labels",
-              "status",
-              "guidance"
-            ],
-            "type": "object"
-          }
-        ]
-      },
-      "outcome_persisted": {
-        "const": false,
-        "type": "boolean"
-      },
-      "replayed": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "limited",
-      "message",
-      "outcome_persisted",
-      "guidance"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "idempotency_expires_at": {
+        "description": "Until this time, a retry with the same idempotency_key returns this send; after it, the same key sends again.",
+        "type": "string"
+      },
+      "limited": {
+        "const": false,
+        "type": "boolean"
+      },
+      "message": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "const": "accepted",
+                "description": "Accepted by the email provider, not confirmation of delivery.",
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "guidance": {
+                "type": "string"
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "enum": [
+                  "rejected",
+                  "unknown"
+                ],
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status",
+              "guidance"
+            ],
+            "type": "object"
+          }
+        ],
+        "description": "The saved send. Check status: a successful call can still return rejected or unknown."
+      },
+      "outcome_persisted": {
+        "const": true,
+        "type": "boolean"
+      },
+      "replayed": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "limited",
+      "message",
+      "outcome_persisted"
+    ],
+    "type": "object"
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "guidance": {
+        "type": "string"
+      },
+      "idempotency_expires_at": {
+        "description": "Until this time, a retry with the same idempotency_key returns this send; after it, the same key sends again.",
+        "type": "string"
+      },
+      "limited": {
+        "const": false,
+        "type": "boolean"
+      },
+      "message": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "const": "accepted",
+                "description": "Accepted by the email provider, not confirmation of delivery.",
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "created_at": {
+                "description": "Absolute ISO 8601 service timestamp in UTC (Z), with millisecond precision.",
+                "type": "string"
+              },
+              "error_code": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "guidance": {
+                "type": "string"
+              },
+              "id": {
+                "type": "string"
+              },
+              "in_reply_to": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "inbox_id": {
+                "type": "string"
+              },
+              "labels": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "recipient_count": {
+                "maximum": 9007199254740991,
+                "minimum": 0,
+                "type": "integer"
+              },
+              "status": {
+                "enum": [
+                  "rejected",
+                  "unknown"
+                ],
+                "type": "string"
+              },
+              "thread_id": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "id",
+              "inbox_id",
+              "thread_id",
+              "created_at",
+              "recipient_count",
+              "error_code",
+              "in_reply_to",
+              "labels",
+              "status",
+              "guidance"
+            ],
+            "type": "object"
+          }
+        ],
+        "description": "The saved send. Check status: a successful call can still return rejected or unknown."
+      },
+      "outcome_persisted": {
+        "const": false,
+        "type": "boolean"
+      },
+      "replayed": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "limited",
+      "message",
+      "outcome_persisted",
+      "guidance"
+    ],
+    "type": "object"
+  }
+]
  2. First observed

TDQS

A3.8/5.0
Behavior4/5

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

Annotations already declare destructiveHint=true and openWorldHint=true, so the safety profile is covered. The description adds real context beyond them: original bodies, quoted history and files are forwarded as stored and should be checked for disclosure, and the note is placed before the original content. It omits retry/idempotency behavior, but that is documented on idempotency_key in the schema.

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, front-loaded with the action, then the key disclosure caveat, then the thread behavior. No filler and every sentence carries distinct information.

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?

An output schema exists, so return values need not be explained. For a destructive open-world send tool it covers the essentials - what content goes out, the authorization constraint, and new-thread behavior - with only labeling and idempotency left to the schema.

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 56%, so the description must compensate and only partly does: it explains the optional note and implies attachments are carried as stored (relevant to include_attachments). It says nothing about to/cc/bcc, labels, or inbox_id/message_id semantics, leaving those to 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 ('Forward a message') and adds a genuine differentiator from the reply siblings ('Starts a new conversation'). It doesn't name reply_message/reply_all_message directly, but the new-thread distinction already lets an agent separate this from those tools.

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?

'recipients the assignment authorizes' implies a prerequisite (authorization scope) and 'Starts a new conversation' implies when it should be chosen over a reply, but neither is stated as an explicit when-to-use rule and no alternative tool is named. Usage is inferable rather than spelled out.

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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