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send_draft

Sends an existing draft email by its ID, delivering the message to the recipients.

Instructions

Send an existing draft

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesThe ID of the draft to send

Implementation Reference

  • src/index.ts:371-386 (registration)
    The 'send_draft' tool is registered using server.tool() with name 'send_draft' and description 'Send an existing draft'.
    server.tool("send_draft",
      "Send an existing draft",
      {
        id: z.string().describe("The ID of the draft to send")
      },
      async (params) => {
        return handleTool(config, async (gmail: gmail_v1.Gmail) => {
          try {
            const { data } = await gmail.users.drafts.send({ userId: 'me', requestBody: { id: params.id } })
            return formatResponse(data)
          } catch (error) {
            return formatResponse({ error: 'Error sending draft, are you sure you have at least one recipient?' })
          }
        })
      }
    )
  • The handler function that executes the send_draft tool logic. It calls gmail.users.drafts.send with the draft ID and returns the response. Wraps the call in a try/catch that returns a user-friendly error message if sending fails (e.g., missing recipients).
    async (params) => {
      return handleTool(config, async (gmail: gmail_v1.Gmail) => {
        try {
          const { data } = await gmail.users.drafts.send({ userId: 'me', requestBody: { id: params.id } })
          return formatResponse(data)
        } catch (error) {
          return formatResponse({ error: 'Error sending draft, are you sure you have at least one recipient?' })
        }
      })
    }
  • The input schema for send_draft, which expects a single required string parameter 'id' (the ID of the draft to send).
    {
      id: z.string().describe("The ID of the draft to send")
    },
Behavior2/5

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

No annotations are provided, and the description fails to disclose behavioral traits such as side effects (e.g., draft deletion after sending), authorization requirements, or error conditions. The agent has minimal insight beyond the basic action.

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 description is a single concise sentence with no waste. However, it lacks structure (e.g., no separation of purpose and usage).

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

Completeness3/5

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

Given the tool's simplicity (one parameter, no output schema), the description provides minimal context. It omits information about what happens after sending (e.g., draft status change) and potential failure modes, leaving gaps for an agent.

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?

The schema covers 100% of parameters with descriptions, so baseline is 3. The description adds no extra meaning beyond what the schema already provides for the 'id' parameter.

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?

The description clearly states the action 'Send' and resource 'existing draft', distinguishing from siblings like create_draft and delete_draft. However, it does not explicitly differentiate from send_message, which could cause confusion.

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

Usage Guidelines2/5

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

No guidance is provided on when to use send_draft versus alternatives like send_message or create_draft. There are no prerequisites or exclusions mentioned, leaving the agent to infer usage.

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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