การสร้างตัวแทนผู้ช่วยอีเมลอย่างง่าย

สถาปัตยกรรมเอเจนต์ผู้ช่วยอีเมล

# Email Assistant Pipeline:
#
# 1. FETCH: Pull unread emails from Gmail API
# 2. CLASSIFY: LLM labels each email
#    - 'action_needed': requires a reply
#    - 'fyi': informational, no reply needed
#    - 'spam': should be archived
# 3. DRAFT: LLM generates reply for 'action_needed' emails
# 4. APPROVE: Human reviews drafts in Gmail UI
# 5. SEND: Agent sends approved drafts
#
# Tools: Gmail API, Anthropic/OpenAI API, json, base64

print('Email assistant pipeline: fetch -> classify -> draft -> approve -> send')

การกำหนดเครื่องมือของเอเจนต์

class EmailAssistantTools:
    def __init__(self, gmail_service, llm_client):
        self.gmail = gmail_service
        self.llm = llm_client

    def fetch_unread(self, max_emails=10):
        '''Fetch unread emails from inbox.'''
        pass

    def classify_email(self, subject, body, sender):
        '''Ask LLM to classify: action_needed / fyi / spam.'''
        pass

    def draft_reply(self, subject, body, sender, context):
        '''Ask LLM to draft a reply to an email.'''
        pass

    def create_draft(self, message_id, reply_text):
        '''Save draft reply in Gmail for human review.'''
        pass

    def send_approved_drafts(self):
        '''Send all drafts marked as approved.'''
        pass

print('Tool-based architecture enables testing each step independently')

ขั้นตอนที่ 1: การดึงข้อมูลและแยกวิเคราะห์อีเมล

import base64

def fetch_emails_for_classification(gmail_service, max_emails=10):
    messages_list = gmail_service.users().messages().list(
        userId='me',
        q='is:unread label:inbox',
        maxResults=max_emails
    ).execute().get('messages', [])

    emails = []
    for ref in messages_list:
        msg = gmail_service.users().messages().get(
            userId='me', id=ref['id'], format='full'
        ).execute()

        headers = {h['name'].lower(): h['value']
                   for h in msg['payload'].get('headers', [])}
        body = extract_plain_text_body(msg)[:2000]  # trim for LLM

        emails.append({
            'id': msg['id'],
            'thread_id': msg['threadId'],
            'from': headers.get('from', ''),
            'subject': headers.get('subject', '(no subject)'),
            'body': body
        })

    print(f'Fetched {len(emails)} unread emails')
    return emails

ขั้นตอนที่ 2: การจัดหมวดหมู่ด้วย LLM

import json
import anthropic
import os

client = anthropic.Anthropic(api_key=os.environ['ANTHROPIC_API_KEY'])

def classify_email(subject, sender, body):
    prompt = (
        'Classify this email as exactly one of: action_needed, fyi, spam.\n'
        'Return JSON only: {"category": "...", "reason": "..."}\n\n'
        f'From: {sender}\n'
        f'Subject: {subject}\n\n'
        f'Body:\n{body[:1500]}'
    )

    response = client.messages.create(
        model='claude-opus-4-5',
        max_tokens=200,
        messages=[{'role': 'user', 'content': prompt}]
    )

    try:
        result = json.loads(response.content[0].text)
        return result.get('category', 'fyi'), result.get('reason', '')
    except json.JSONDecodeError:
        return 'fyi', 'Could not parse LLM response'

ขั้นตอนที่ 3: การสร้างฉบับร่างคำตอบ

def draft_reply(subject, sender, body, agent_context):
    prompt = (
        'You are an email assistant drafting a professional reply.\n'
        'Guidelines:\n'
        '- Be concise and professional\n'
        '- Use [FILL IN] for any info you don\'t know\n'
        '- Start with a greeting, end with a sign-off\n\n'
        f'Context about the recipient\'s work: {agent_context}\n\n'
        f'Original email from {sender}:\n'
        f'Subject: {subject}\n\n'
        f'{body[:1500]}\n\n'
        'Draft a reply:'
    )

    response = client.messages.create(
        model='claude-opus-4-5',
        max_tokens=500,
        messages=[{'role': 'user', 'content': prompt}]
    )

    return response.content[0].text.strip()

ขั้นตอนที่ 4: การบันทึกฉบับร่างเพื่อให้มนุษย์ตรวจสอบ

import base64
from email.mime.text import MIMEText

def save_draft_reply(gmail_service, original_message, reply_text):
    sender_header = next(
        (h['value'] for h in original_message['payload'].get('headers', [])
         if h['name'].lower() == 'from'), ''
    )
    subject = next(
        (h['value'] for h in original_message['payload'].get('headers', [])
         if h['name'].lower() == 'subject'), ''
    )
    msg_id_header = next(
        (h['value'] for h in original_message['payload'].get('headers', [])
         if h['name'].lower() == 'message-id'), ''
    )

    mime_msg = MIMEText(reply_text, 'plain', 'utf-8')
    mime_msg['To'] = sender_header
    mime_msg['Subject'] = 'Re: ' + subject
    mime_msg['In-Reply-To'] = msg_id_header
    mime_msg['References'] = msg_id_header

    raw = base64.urlsafe_b64encode(mime_msg.as_bytes()).decode()
    draft = gmail_service.users().drafts().create(
        userId='me',
        body={'message': {'raw': raw, 'threadId': original_message['threadId']}}
    ).execute()

    print(f'Draft saved: {draft["id"]}')
    return draft['id']

# --- demo: minimal stand-in for the Gmail API's service object ---
class _Exec:
    def __init__(self, result):
        self._result = result
    def execute(self):
        return self._result

class _FakeDrafts:
    def create(self, userId, body):
        return _Exec({'id': 'r9000abc'})

class _FakeUsers:
    def drafts(self):
        return _FakeDrafts()

class _FakeGmailService:
    def users(self):
        return _FakeUsers()

original_message = {
    'threadId': 'thread_1',
    'payload': {'headers': [
        {'name': 'From', 'value': 'customer@example.com'},
        {'name': 'Subject', 'value': 'Question about my order'},
        {'name': 'Message-ID', 'value': '<abc123@mail.example.com>'}
    ]}
}
save_draft_reply(_FakeGmailService(), original_message, 'Thanks for reaching out, we will look into it.')

ขั้นตอนที่ 5: การทำเครื่องหมายอีเมลที่ประมวลผลแล้ว

def get_or_create_label(gmail_service, label_name):
    labels = gmail_service.users().labels().list(userId='me').execute()
    for label in labels.get('labels', []):
        if label['name'] == label_name:
            return label['id']

    # Create the label
    new_label = gmail_service.users().labels().create(
        userId='me',
        body={
            'name': label_name,
            'labelListVisibility': 'labelShow',
            'messageListVisibility': 'show'
        }
    ).execute()
    print(f'Created label: {label_name}')
    return new_label['id']

def mark_processed(gmail_service, message_id, agent_label_id):
    gmail_service.users().messages().modify(
        userId='me',
        id=message_id,
        body={
            'addLabelIds': [agent_label_id],
            'removeLabelIds': ['UNREAD']
        }
    ).execute()

# --- demo: minimal stand-in for the Gmail API's service object ---
class _Exec:
    def __init__(self, result):
        self._result = result
    def execute(self):
        return self._result

class _FakeUsers:
    def __init__(self):
        self._labels = [{'id': 'Label_1', 'name': 'Processed'}]
    def labels(self):
        return self
    def list(self, userId):
        return _Exec({'labels': self._labels})
    def create(self, userId, body):
        print(f'Created label: {body["name"]}')
        return _Exec({'id': 'Label_2', 'name': body['name']})
    def messages(self):
        return self
    def modify(self, userId, id, body):
        print(f'Marked {id} processed with {body}')
        return _Exec({'id': id})

class _FakeGmailService:
    def users(self):
        return _FakeUsers()

gmail_service = _FakeGmailService()
label_id = get_or_create_label(gmail_service, 'Processed')
print(f'Label id: {label_id}')
new_label_id = get_or_create_label(gmail_service, 'AgentHandled')
mark_processed(gmail_service, 'msg_99', new_label_id)

วงจรการทำงานทั้งหมดของเอเจนต์

def run_email_agent(gmail_service, agent_context, max_emails=10):
    processed_label = get_or_create_label(gmail_service, 'AgentProcessed')
    emails = fetch_emails_for_classification(gmail_service, max_emails)

    summary = {'action_needed': 0, 'fyi': 0, 'spam': 0, 'drafts_created': 0}

    for email in emails:
        category, reason = classify_email(
            email['subject'], email['from'], email['body']
        )
        summary[category] += 1
        print(f'[{category}] {email["subject"][:60]} - {reason[:50]}')

        if category == 'action_needed':
            # Fetch full message for reply context
            full_msg = gmail_service.users().messages().get(
                userId='me', id=email['id'], format='full'
            ).execute()
            reply = draft_reply(
                email['subject'], email['from'],
                email['body'], agent_context
            )
            save_draft_reply(gmail_service, full_msg, reply)
            summary['drafts_created'] += 1

        mark_processed(gmail_service, email['id'], processed_label)

    print('\nAgent run complete:')
    for k, v in summary.items():
        print(f'  {k}: {v}')
    return summary

การจัดการข้อผิดพลาดและความทนทาน

from googleapiclient.errors import HttpError

def process_email_safely(gmail_service, email, agent_context, label_id):
    try:
        category, reason = classify_email(
            email['subject'], email['from'], email['body']
        )

        if category == 'action_needed':
            full_msg = gmail_service.users().messages().get(
                userId='me', id=email['id'], format='full'
            ).execute()
            reply = draft_reply(
                email['subject'], email['from'],
                email['body'], agent_context
            )
            save_draft_reply(gmail_service, full_msg, reply)

        mark_processed(gmail_service, email['id'], label_id)
        return category

    except HttpError as e:
        print(f'Gmail API error on {email["id"]}: {e.resp.status}')
        return 'error'
    except Exception as e:
        print(f'Unexpected error on {email["subject"][:50]}: {e}')
        return 'error'

การตั้งเวลาให้เอเจนต์ทำงานเป็นระยะ

import time
import datetime

def is_business_hours():
    now = datetime.datetime.now()
    # Mon-Fri, 9am-6pm local time
    return (now.weekday() < 5 and 9 <= now.hour < 18)

def run_scheduler(gmail_service, agent_context,
                  interval_minutes=30, max_emails=20):
    print(f'Email agent started. Checking every {interval_minutes} min.')

    while True:
        if is_business_hours():
            print(f'\n[{datetime.datetime.now().strftime("%H:%M")}] Running agent...')
            try:
                run_email_agent(gmail_service, agent_context, max_emails)
            except Exception as e:
                print(f'Agent run failed: {e}')
        else:
            print('Outside business hours, skipping run')

        time.sleep(interval_minutes * 60)

การบันทึกและเส้นทางการตรวจสอบ

import json
import datetime
from pathlib import Path

LOG_FILE = Path('agent_audit.jsonl')

def log_action(email_id, subject, sender, category, action, draft_id=None):
    entry = {
        'timestamp': datetime.datetime.now().isoformat(),
        'email_id': email_id,
        'subject': subject[:100],
        'from': sender,
        'category': category,
        'action': action,
        'draft_id': draft_id
    }
    with open(LOG_FILE, 'a', encoding='utf-8') as f:
        f.write(json.dumps(entry) + '\n')

# Usage in the main loop:
log_action(
    email_id='18abc123',
    subject='Invoice #1234',
    sender='billing@vendor.com',
    category='action_needed',
    action='draft_created',
    draft_id='r9000abc'
)

# --- demo ---
print('Audit log contents:')
print(LOG_FILE.read_text(encoding='utf-8'))

ตรวจสอบความเข้าใจอย่างรวดเร็ว: มนุษย์ร่วมตรวจสอบ

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