send_draft

Instructions

Implementation Reference

• src/index.ts:338-353 (handler)

  Full tool registration including schema, description, and handler function that sends a Gmail draft using the Gmail API drafts.send method. The handler wraps the API call in handleTool for authentication and error handling.

  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?' })
        }
      })
    }
  )

• src/index.ts:340-342 (schema)

  Input schema for send_draft tool: requires 'id' of the draft to send.

  {
    id: z.string().describe("The ID of the draft to send")
  },

• src/index.ts:49-65 (helper)

  Shared helper function used by send_draft (and other tools) to handle OAuth2 authentication, credential validation, Gmail client creation, and API call execution.

  const handleTool = async (queryConfig: Record<string, any> | undefined, apiCall: (gmail: gmail_v1.Gmail) => Promise<any>) => {
    try {
      const oauth2Client = queryConfig ? createOAuth2Client(queryConfig) : defaultOAuth2Client
      if (!oauth2Client) throw new Error('OAuth2 client could not be created, please check your credentials')
  
      const credentialsAreValid = await validateCredentials(oauth2Client)
      if (!credentialsAreValid) throw new Error('OAuth2 credentials are invalid, please re-authenticate')
  
      const gmailClient = queryConfig ? google.gmail({ version: 'v1', auth: oauth2Client }) : defaultGmailClient
      if (!gmailClient) throw new Error('Gmail client could not be created, please check your credentials')
  
      const result = await apiCall(gmailClient)
      return result
    } catch (error: any) {
      return `Tool execution failed: ${error.message}`
    }
  }

• src/index.ts:47-47 (helper)

  Helper function to format API responses for MCP tool output.

  const formatResponse = (response: any) => ({ content: [{ type: "text", text: JSON.stringify(response) }] })

• src/index.ts:338-353 (registration)

  Registration of the send_draft tool on the MCP server.

  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?' })
        }
      })
    }
  )