improvement: added gmail draft operation

apps/sim/tools/gmail/draft.ts

@@ -0,0 +1,101 @@
+import type { ToolConfig } from '../types'
+import type { GmailSendParams, GmailToolResponse } from './types'
+
+const GMAIL_API_BASE = 'https://gmail.googleapis.com/gmail/v1/users/me'
+
+export const gmailDraftTool: ToolConfig<GmailSendParams, GmailToolResponse> = {
+  id: 'gmail_draft',
+  name: 'Gmail Draft',
+  description: 'Draft emails using Gmail',
+  version: '1.0.0',
+
+  oauth: {
+    required: true,
+    provider: 'google-email',
+    additionalScopes: ['https://www.googleapis.com/auth/gmail.compose'],
+  },
+
+  params: {
+    accessToken: {
+      type: 'string',
+      required: true,
+      description: 'Access token for Gmail API',
+    },
+    to: {
+      type: 'string',
+      required: true,
+      description: 'Recipient email address',
+    },
+    subject: {
+      type: 'string',
+      required: true,
+      description: 'Email subject',
+    },
+    body: {
+      type: 'string',
+      required: true,
+      description: 'Email body content',
+    },
+  },
+
+  request: {
+    url: () => `${GMAIL_API_BASE}/drafts`,
+    method: 'POST',
+    headers: (params: GmailSendParams) => ({
+      Authorization: `Bearer ${params.accessToken}`,
+      'Content-Type': 'application/json',
+    }),
+    body: (params: GmailSendParams): Record<string, any> => {
+      const email = [
+        'Content-Type: text/plain; charset="UTF-8"',
+        'MIME-Version: 1.0',
+        `To: ${params.to}`,
+        `Subject: ${params.subject}`,
+        '',
+        params.body,
+      ].join('\n')
+
+      return {
+        message: {
+          raw: Buffer.from(email).toString('base64url'),
+        },
+      }
+    },
+  },
+
+  transformResponse: async (response) => {
+    const data = await response.json()
+
+    if (!response.ok) {
+      throw new Error(data.error?.message || 'Failed to draft email')
+    }
+
+    return {
+      success: true,
+      output: {
+        content: 'Email drafted successfully',
+        metadata: {
+          id: data.id,
+          message: {
+            id: data.message?.id,
+            threadId: data.message?.threadId,
+            labelIds: data.message?.labelIds,
+          },
+        },
+      },
+    }
+  },
+
+  transformError: (error) => {
+    if (error.error?.message) {
+      if (error.error.message.includes('invalid authentication credentials')) {
+        return 'Invalid or expired access token. Please reauthenticate.'
+      }
+      if (error.error.message.includes('quota')) {
+        return 'Gmail API quota exceeded. Please try again later.'
+      }
+      return error.error.message
+    }
+    return error.message || 'An unexpected error occurred while drafting email'
+  },
+}

apps/sim/tools/gmail/index.ts

@@ -1,5 +1,6 @@
+import { gmailDraftTool } from './draft'
 import { gmailReadTool } from './read'
 import { gmailSearchTool } from './search'
 import { gmailSendTool } from './send'
 
-export { gmailSendTool, gmailReadTool, gmailSearchTool }
+export { gmailSendTool, gmailReadTool, gmailSearchTool, gmailDraftTool }