AI Agent Infrastructure
The Email API for Autonomous Agents
Equip your LLMs, autonomous workflows, and agent swarms with secure, reliable, and compliant email delivery. Safety guardrails and prompt safety filters included.
Structured JSON Outputs
Ensure your agents always generate structurally sound emails. Validate body templates, target list JSON arrays, and attachments dynamically against schemas before hitting the wire.
Prompt Safety Guardrails
Protect your sender reputation. Automatically filter out prompt injections, spam patterns, and unverified links generated in real-time by LLM pipelines.
Agent-to-Human Feedback
Bidirectional communications. Receive, parse, and feed incoming human email replies directly back to your agents via clean webhooks and callback systems.
Built for Agent SDKs
Integrate using standard developer tools. Works natively with popular frameworks like LangChain, CrewAI, AutoGen, and LangGraph with simple SDK connectors.
Secure Sandbox Execution
Test your agents in complete safety. Our live developer sandbox lets you simulate sending and inspect payloads without spending quota or routing actual outbound mail to active test mailboxes.
Supported AI Assistants & Agent Frameworks
Claude
Equip Claude with direct email capabilities via Anthropic Tool Use (Function Calling). Let your Claude instances send alerts, summaries, and notifications.
Cursor
Generate custom email integration scripts directly inside Cursor using our optimized context structures and API examples.
Antigravity
Full compatibility with Antigravity AI agents. Write agent specifications that dynamically call Piisend endpoints to deliver messages.
CrewAI
Register Piisend as a custom Tool for your CrewAI Crews, enabling autonomous agents to collaborate and send email updates to team members.
LangGraph
Build stateful multi-agent workflows in LangGraph that use email triggers to query humans for input and progress past decision gates.
AutoGPT
Allow AutoGPT to run background communication loops with external APIs, customer support, and system administrators via email.