Agent frameworks
Open source
Portkey
Portkey is an AI gateway with fallbacks, caching, budgets, guardrails, observability, and an MCP gateway.
- gateway
- guardrails
Freemiumportkey.ai
Guardrails, approvals, and cost control
Gateways for guardrails, approvals, and cost control. Portkey is the gateway listed here.
The same check describes human approval for tool calls in n8n, human-in-the-loop in the OpenAI Agents SDK and CrewAI, and permissions in the Claude Agent SDK. The LangSmith LLM gateway is part of the LangChain platform.
1 tool · How to build a business agent system