set_default_smime_info
Configure the default S/MIME encryption settings for a specific email alias in Gmail to secure outgoing messages.
Instructions
Sets the default S/MIME config for the specified send-as alias
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| sendAsEmail | Yes | The email address that appears in the 'From:' header | |
| id | Yes | The immutable ID for the S/MIME config |
Implementation Reference
- src/index.ts:1295-1300 (handler)Handler for 'set_default_smime_info' tool: authenticates via handleTool and calls Gmail API gmail.users.settings.sendAs.smimeInfo.setDefault to set the default S/MIME config for a send-as alias.
async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.sendAs.smimeInfo.setDefault({ userId: 'me', sendAsEmail: params.sendAsEmail, id: params.id }) return formatResponse(data) }) } - src/index.ts:1292-1294 (schema)Zod input schema defining parameters: sendAsEmail (string) and id (string).
sendAsEmail: z.string().describe("The email address that appears in the 'From:' header"), id: z.string().describe("The immutable ID for the S/MIME config") }, - src/index.ts:1289-1301 (registration)Registers the 'set_default_smime_info' tool on the MCP server with description, schema, and handler.
server.tool("set_default_smime_info", "Sets the default S/MIME config for the specified send-as alias", { sendAsEmail: z.string().describe("The email address that appears in the 'From:' header"), id: z.string().describe("The immutable ID for the S/MIME config") }, async (params) => { return handleTool(config, async (gmail: gmail_v1.Gmail) => { const { data } = await gmail.users.settings.sendAs.smimeInfo.setDefault({ userId: 'me', sendAsEmail: params.sendAsEmail, id: params.id }) return formatResponse(data) }) } ) - src/index.ts:50-80 (helper)Shared helper function used by all Gmail tools, including set_default_smime_info, to handle OAuth2 authentication, create Gmail client, execute API calls, and format errors.
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) { // Check for specific authentication errors if ( error.message?.includes("invalid_grant") || error.message?.includes("refresh_token") || error.message?.includes("invalid_client") || error.message?.includes("unauthorized_client") || error.code === 401 || error.code === 403 ) { return formatResponse({ error: `Authentication failed: ${error.message}. Please re-authenticate by running: npx @shinzolabs/gmail-mcp auth`, }); } return formatResponse({ error: `Tool execution failed: ${error.message}` }); } }