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reply-all-mail-message

Destructive

Reply to all recipients of a message while preserving full HTML formatting. Specify a comment or use MIME format.

Instructions

Reply to all recipients of a message using either JSON or MIME format. When using JSON format:

  • Specify either a comment or the body property of the message parameter. Specifying both will return an HTTP 400 Bad Request error.

  • If the original message specifies a recipient in the replyTo property, per Internet Message Format (RFC 2822), send the reply to the recipients in replyTo and not the recipient in the from property. When using MIME format:

  • Provide the applicable Internet message headers and the MIME content, all encoded in base64 format in the request body.

  • Add any attachments and S/MIME properties to the MIME content. This method saves the message in the Sent Items folder. Alternatively, create a draft to reply-all to a message and send it later.

💡 TIP: Reply-all preserving full HTML formatting. The 'comment' field is your reply text.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyYes
messageIdYesPath parameter: messageId
includeHeadersNoInclude response headers (including ETag) in the response metadata
excludeResponseNoExclude the full response body and only return success or failure indication
Behavior4/5

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

Discloses key behaviors: saves message in Sent Items, HTTP 400 error for conflicting parameters, RFC 2822 replyTo handling. Adds value beyond annotations (destructiveHint=true, etc.).

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?

Well-structured with bullet points for formats, but slightly verbose. Main purpose is front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema, and description fails to explain return values or response behavior. Additional parameters like includeHeaders and excludeResponse are not mentioned.

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?

Description explains the body parameter's Comment and Message properties in detail, but other parameters (messageId, includeHeaders, excludeResponse) are not elaborated beyond schema descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Reply to all recipients of a message' using specific formats, distinguishing it from siblings like reply-mail-message and create-reply-all-draft.

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?

Provides clear guidance on when to use JSON vs MIME format, including constraints like not specifying both comment and body. However, it does not explicitly contrast with alternative tools like create-reply-all-draft.

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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