ClaudePost

Instructions

Implementation Reference

• src/email_client/server.py:275-312 (handler)

  Dispatch handler logic within @server.call_tool() that validates arguments and invokes send_email_async for the send-email tool.

  if name == "send-email":
      to_addresses = arguments.get("to", [])
      subject = arguments.get("subject", "")
      content = arguments.get("content", "")
      cc_addresses = arguments.get("cc", [])
      
      if not to_addresses:
          return [types.TextContent(
              type="text",
              text="At least one recipient email address is required."
          )]
      
      try:
          logging.info("Attempting to send email")
          logging.info(f"To: {to_addresses}")
          logging.info(f"Subject: {subject}")
          logging.info(f"CC: {cc_addresses}")
          
          async with asyncio.timeout(SEARCH_TIMEOUT):
              await send_email_async(to_addresses, subject, content, cc_addresses)
              return [types.TextContent(
                  type="text",
                  text="Email sent successfully! Check email_client.log for detailed logs."
              )]
      except asyncio.TimeoutError:
          logging.error("Operation timed out while sending email")
          return [types.TextContent(
              type="text",
              text="Operation timed out while sending email."
          )]
      except Exception as e:
          error_msg = str(e)
          logging.error(f"Failed to send email: {error_msg}")
          return [types.TextContent(
              type="text",
              text=f"Failed to send email: {error_msg}\n\nPlease check:\n1. Email and password are correct in .env\n2. SMTP settings are correct\n3. Less secure app access is enabled (for Gmail)\n4. Using App Password if 2FA is enabled"
          )]

• src/email_client/server.py:116-167 (helper)

  Core helper function that constructs and sends the email using SMTP with configuration from EMAIL_CONFIG.

  async def send_email_async(
      to_addresses: list[str],
      subject: str,
      content: str,
      cc_addresses: list[str] | None = None
  ) -> None:
      """Asynchronously send an email."""
      try:
          # Create message
          msg = MIMEMultipart()
          msg['From'] = EMAIL_CONFIG["email"]
          msg['To'] = ', '.join(to_addresses)
          if cc_addresses:
              msg['Cc'] = ', '.join(cc_addresses)
          msg['Subject'] = subject
          
          # Add body
          msg.attach(MIMEText(content, 'plain', 'utf-8'))
          
          # Connect to SMTP server and send email
          def send_sync():
              with smtplib.SMTP(EMAIL_CONFIG["smtp_server"], EMAIL_CONFIG["smtp_port"]) as server:
                  server.set_debuglevel(1)  # Enable debug output
                  logging.debug(f"Connecting to {EMAIL_CONFIG['smtp_server']}:{EMAIL_CONFIG['smtp_port']}")
                  
                  # Start TLS
                  logging.debug("Starting TLS")
                  server.starttls()
                  
                  # Login
                  logging.debug(f"Logging in as {EMAIL_CONFIG['email']}")
                  server.login(EMAIL_CONFIG["email"], EMAIL_CONFIG["password"])
                  
                  # Send email
                  all_recipients = to_addresses + (cc_addresses or [])
                  logging.debug(f"Sending email to: {all_recipients}")
                  result = server.send_message(msg, EMAIL_CONFIG["email"], all_recipients)
                  
                  if result:
                      # send_message returns a dict of failed recipients
                      raise Exception(f"Failed to send to some recipients: {result}")
                  
                  logging.debug("Email sent successfully")
          
          # Run the synchronous send function in the executor
          loop = asyncio.get_event_loop()
          await loop.run_in_executor(None, send_sync)
          
      except Exception as e:
          logging.error(f"Error in send_email_async: {str(e)}")
          raise

• src/email_client/server.py:233-260 (registration)

  Registers the send-email tool in the @server.list_tools() handler, including its description and input schema.

  types.Tool(
      name="send-email",
      description="CONFIRMATION STEP: Actually send the email after user confirms the details. Before calling this, first show the email details to the user for confirmation. Required fields: recipients (to), subject, and content. Optional: CC recipients.",
      inputSchema={
          "type": "object",
          "properties": {
              "to": {
                  "type": "array",
                  "items": {"type": "string"},
                  "description": "List of recipient email addresses (confirmed)",
              },
              "subject": {
                  "type": "string",
                  "description": "Confirmed email subject",
              },
              "content": {
                  "type": "string",
                  "description": "Confirmed email content",
              },
              "cc": {
                  "type": "array",
                  "items": {"type": "string"},
                  "description": "List of CC recipient email addresses (optional, confirmed)",
              },
          },
          "required": ["to", "subject", "content"],
      },
  ),

• src/email_client/server.py:237-259 (schema)

  JSON Schema defining the input parameters for the send-email tool: required to, subject, content; optional cc.

      "type": "object",
      "properties": {
          "to": {
              "type": "array",
              "items": {"type": "string"},
              "description": "List of recipient email addresses (confirmed)",
          },
          "subject": {
              "type": "string",
              "description": "Confirmed email subject",
          },
          "content": {
              "type": "string",
              "description": "Confirmed email content",
          },
          "cc": {
              "type": "array",
              "items": {"type": "string"},
              "description": "List of CC recipient email addresses (optional, confirmed)",
          },
      },
      "required": ["to", "subject", "content"],
  },