The source’s draft-only instruction is prompt guidance.
GmailTools() exposes send_email and send_email_reply by default. Disable the send tools before running.draft_reply.py
"""
Gmail Draft Reply Agent
=======================
Reads a conversation thread and drafts a contextual reply.
The agent never sends -- it only creates drafts for human review.
Key concepts:
- Thread-aware drafting: thread_id + message_id link the draft to the conversation
Setup:
1. Create OAuth credentials at https://console.cloud.google.com (enable Gmail API)
2. Export GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET, GOOGLE_PROJECT_ID env vars
3. pip install openai google-api-python-client google-auth-httplib2 google-auth-oauthlib
4. First run opens browser for OAuth consent, saves token.json for reuse
"""
from agno.agent import Agent
from agno.models.openai import OpenAIResponses
from agno.tools.google.gmail import GmailTools
# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
agent = Agent(
name="Draft Reply Agent",
model=OpenAIResponses(id="gpt-5.5"),
tools=[GmailTools()],
instructions=[
"Match the tone and formality of the existing conversation.",
"Keep replies concise and professional unless instructed otherwise.",
"Always create a draft -- never send directly.",
"Summarize the thread context so the user knows what the reply addresses.",
],
markdown=True,
)
# ---------------------------------------------------------------------------
# Run Demo
# ---------------------------------------------------------------------------
if __name__ == "__main__":
agent.print_response(
"Find the most recent thread about 'project update' and draft a reply "
"acknowledging the update and asking about next steps",
stream=True,
)
# Draft a reply to a specific sender
# agent.print_response(
# "Find the latest email from john@example.com and draft a polite follow-up reply",
# stream=True,
# )
Run the Example
1
Set up your virtual environment
uv venv --python 3.12
source .venv/bin/activate
uv venv --python 3.12
.venv\Scripts\activate
2
Install dependencies
uv pip install -U agno google-api-python-client google-auth google-auth-httplib2 google-auth-oauthlib openai
3
Export environment variables
export GOOGLE_CLIENT_ID="your_google_client_id_here"
export GOOGLE_CLIENT_SECRET="your_google_client_secret_here"
export GOOGLE_PROJECT_ID="your_google_project_id_here"
export OPENAI_API_KEY="your_openai_api_key_here"
$Env:GOOGLE_CLIENT_ID="your_google_client_id_here"
$Env:GOOGLE_CLIENT_SECRET="your_google_client_secret_here"
$Env:GOOGLE_PROJECT_ID="your_google_project_id_here"
$Env:OPENAI_API_KEY="your_openai_api_key_here"
4
Disable send tools
Replace
GmailTools() with GmailTools(send_email=False, send_email_reply=False, send_draft=False).5
Run the example
Save the code above as
draft_reply.py, then run:python draft_reply.py