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inbox.send_reply

Destructive

Send an email reply through the user's Gmail. This emails a real person from the user's address. Only call after the user has seen the exact message body and explicitly approved sending it.

Input Schema

NameRequiredDescriptionDefault
bodyYesHTML body of the reply, exactly as approved by the user
item_idYesInbox item id
confirmedYesMust be true, and only after the user explicitly approved sending this exact message
draft_kindNoSet when the body came from inbox.draft_reply

Output Schema

NameRequiredDescriptionDefault
dataYes
metaNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed33 schema fields changed
    • changedOutput schema / properties / data / properties / email / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "properties": {
      -      "account": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "dkim_verified": {
      -        "anyOf": [
      -          {
      -            "type": "boolean"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "from": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "id": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "number"
      -          }
      -        ],
      -        "description": "Stable resource identifier"
      -      },
      -      "replyable": {
      -        "anyOf": [
      -          {
      -            "type": "boolean"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "sent_at": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "snippet": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "subject": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "thread_count": {
      -        "anyOf": [
      -          {
      -            "type": "number"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "unsubscribable": {
      -        "anyOf": [
      -          {
      -            "type": "boolean"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      }
      -    },
      -    "required": [
      -      "id"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "account": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "dkim_verified": {
      +        "type": [
      +          "boolean",
      +          "null"
      +        ]
      +      },
      +      "from": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "id": {
      +        "description": "Stable resource identifier",
      +        "type": [
      +          "string",
      +          "number"
      +        ]
      +      },
      +      "replyable": {
      +        "type": [
      +          "boolean",
      +          "null"
      +        ]
      +      },
      +      "sent_at": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "snippet": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "subject": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "thread_count": {
      +        "type": [
      +          "number",
      +          "null"
      +        ]
      +      },
      +      "unsubscribable": {
      +        "type": [
      +          "boolean",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "id"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / data / properties / id / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "number"
      -  }
      -]
    • addedOutput schema / properties / data / properties / id / type
      Added value: +[
      +  "string",
      +  "number"
      +]
    • removedOutput schema / properties / data / properties / kind / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / kind / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • changedOutput schema / properties / data / properties / payload / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "properties": {
      -      "company": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "company_url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "created_board_record": {
      -        "anyOf": [
      -          {
      -            "type": "boolean"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "interviewers": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "job_url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "location": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "logo_url": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "recruiter_name": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "role": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      }
      -    },
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "company": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "company_url": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "created_board_record": {
      +        "type": [
      +          "boolean",
      +          "null"
      +        ]
      +      },
      +      "interviewers": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "job_url": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "location": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "logo_url": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "recruiter_name": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "role": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      }
      +    },
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / from / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / from / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / id / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "number"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / id / type
      Added value: +[
      +  "string",
      +  "number"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / kind / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / kind / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / messages / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / messages / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / sent_at / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / sent_at / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / state / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / state / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / subject / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / subject / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / related / items / properties / unread / anyOf
      Removed value: -[
      -  {
      -    "type": "boolean"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / related / items / properties / unread / type
      Added value: +[
      +  "boolean",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / replied / anyOf
      Removed value: -[
      -  {
      -    "type": "boolean"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / replied / type
      Added value: +[
      +  "boolean",
      +  "null"
      +]
    • changedOutput schema / properties / data / properties / resulting / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": {},
      -    "properties": {
      -      "id": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "number"
      -          }
      -        ],
      -        "description": "Stable resource identifier"
      -      },
      -      "job_id": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "type": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      }
      -    },
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "id": {
      +        "description": "Stable resource identifier",
      +        "type": [
      +          "string",
      +          "number"
      +        ]
      +      },
      +      "job_id": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      },
      +      "type": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      }
      +    },
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / data / properties / state / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / state / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / data / properties / unread_reply / anyOf
      Removed value: -[
      -  {
      -    "type": "boolean"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / data / properties / unread_reply / type
      Added value: +[
      +  "boolean",
      +  "null"
      +]
    • removedOutput schema / properties / meta / properties / next_page / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / meta / properties / next_page / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / meta / properties / total_count / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / meta / properties / total_count / type
      Added value: +[
      +  "number",
      +  "null"
      +]
  2. Changed8 schema fields changed
    • changedOutput schema / properties / data / properties / confidence / anyOf
      Previous value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "enum": [
      +      "high",
      +      "low"
      +    ],
      +    "type": "string"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • addedOutput schema / properties / data / properties / email / anyOf
      Added value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "account": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "dkim_verified": {
      +        "anyOf": [
      +          {
      +            "type": "boolean"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "from": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "id": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "number"
      +          }
      +        ],
      +        "description": "Stable resource identifier"
      +      },
      +      "replyable": {
      +        "anyOf": [
      +          {
      +            "type": "boolean"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "sent_at": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "snippet": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "subject": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "thread_count": {
      +        "anyOf": [
      +          {
      +            "type": "number"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "unsubscribable": {
      +        "anyOf": [
      +          {
      +            "type": "boolean"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      }
      +    },
      +    "required": [
      +      "id"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • addedOutput schema / properties / data / properties / payload / anyOf
      Added value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "company": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "company_url": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "created_board_record": {
      +        "anyOf": [
      +          {
      +            "type": "boolean"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "interviewers": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "job_url": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "location": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "logo_url": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "recruiter_name": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "role": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      }
      +    },
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • addedOutput schema / properties / data / properties / related / items / additionalProperties
      Added value: +{}
    • addedOutput schema / properties / data / properties / related / items / properties
      Added value: +{
      +  "from": {
      +    "anyOf": [
      +      {
      +        "type": "string"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  },
      +  "id": {
      +    "anyOf": [
      +      {
      +        "type": "string"
      +      },
      +      {
      +        "type": "number"
      +      }
      +    ],
      +    "description": "Stable resource identifier"
      +  },
      +  "kind": {
      +    "anyOf": [
      +      {
      +        "type": "string"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  },
      +  "messages": {
      +    "anyOf": [
      +      {
      +        "type": "number"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  },
      +  "sent_at": {
      +    "anyOf": [
      +      {
      +        "type": "string"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  },
      +  "state": {
      +    "anyOf": [
      +      {
      +        "type": "string"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  },
      +  "subject": {
      +    "anyOf": [
      +      {
      +        "type": "string"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  },
      +  "unread": {
      +    "anyOf": [
      +      {
      +        "type": "boolean"
      +      },
      +      {
      +        "type": "null"
      +      }
      +    ]
      +  }
      +}
    • addedOutput schema / properties / data / properties / related / items / required
      Added value: +[
      +  "id"
      +]
    • addedOutput schema / properties / data / properties / related / items / type
      Added value: +"object"
    • addedOutput schema / properties / data / properties / resulting / anyOf
      Added value: +[
      +  {
      +    "additionalProperties": {},
      +    "properties": {
      +      "id": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "number"
      +          }
      +        ],
      +        "description": "Stable resource identifier"
      +      },
      +      "job_id": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "type": {
      +        "anyOf": [
      +          {
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      }
      +    },
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
  3. Added

TDQS

A4.1/5.0
Behavior4/5

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

Annotations already flag destructiveHint, openWorldHint and non-idempotency, so the bar is lower, but the description adds meaningful context the annotations cannot: this sends to a real person from the user's own address, making the action externally visible and irreversible. It omits delivery failure or rate-limit behavior, but the key risk is surfaced.

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 with zero waste, ordered so the action and its real-world consequence come before the gating condition.

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?

Output schema and full parameter descriptions are present, and the description supplies exactly the missing piece an agent needs: the human-approval gate before an irreversible send. Nothing required to call it safely is absent.

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 100% and every parameter, including the confirmed const-true gate and draft_kind enum, is already documented in the schema. The description reinforces the 'exactly as approved' semantics of body but adds no format or usage detail beyond that, so baseline 3 applies.

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 and resource: sends an email reply via the user's Gmail. It is distinguishable from inbox.draft_reply by intent, but the description never names the draft sibling that would normally precede it, leaving that differentiation implicit.

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 an explicit, strong precondition: only call after the user has seen the exact body and explicitly approved. It does not spell out the alternative workflow (draft first via inbox.draft_reply) or when not to call, so it stops short of full routing guidance.

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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