techwithanirudh/mastra-slack-agent-template/agentmail

AgentMail

Use AgentMail from Python inside the sandbox when the user asks to send, receive, search, reply to, draft, or inspect email. List the account's inboxes first and use an existing inbox unless the user explicitly asks to create one.

Credentials

Use this placeholder:

from agentmail import AgentMail
client = AgentMail(api_key="brokered")

The placeholder is not a secret. It only makes the SDK construct authenticated requests. The host injects the real Authorization header through the sandbox network policy. Never print API keys, bearer headers, or credential-broker internals.

Ground Rules

• Replace your-inbox@agentmail.to with an inbox id returned by

client.inboxes.list().

• Prefer drafts for sensitive, external, broad, or ambiguous messages.
• Send directly only when the user clearly asked for the exact recipient, subject, and body.
• Before sending attachments, confirm the path exists and check size with ls -lh.
• Summarize recipient addresses, subject, body intent, labels, and attachment filenames after any send or draft.
• Do not expose private message bodies unless the user asked to inspect them.
• Do not set up webhook forwarding to third-party URLs without explicit approval.

Common Workflows

List recent mail:

from agentmail import AgentMail
client = AgentMail(api_key="brokered")
messages = client.inboxes.messages.list(inbox_id="your-inbox@agentmail.to")
for message in messages:
    print(message)

Send plain text mail:

client.inboxes.messages.send(
    inbox_id="your-inbox@agentmail.to",
    to="recipient@example.com",
    subject="Hello",
    text="Plain text body",
)

Create a draft for user approval:

draft = client.inboxes.drafts.create(
    inbox_id="your-inbox@agentmail.to",
    to="recipient@example.com",
    subject="Pending approval",
    text="Draft content",
)
print(draft)

References

• Full Python inbox, message, thread, draft, attachment, pod, and label examples: Core API.
• Webhook creation and signature verification: Webhooks.
• WebSocket subscriptions for live inbox events: WebSockets.