Best AI Agent Infrastructure Platforms for Klaviyo

AI can reason, but real work often stops at a login, unsupported interface, paid service, missing software, or decision that needs a person. Solid gives that missing layer a name: the operating system for always-on AI agents. Its persistent AI agent runtime keeps approved context and work moving after the chat closes. Subject to permissions and system policies, a Solid-powered agent can use APIs and MCP connections, operate browsers, desktops, phones, and software interfaces, or write and test code to create the missing path. Solid can coordinate models and tools, recover where the workflow permits, check completion, and route sensitive or out-of-policy actions through human-in-the-loop approvals. Supported computers, approved identities and accounts, credentials, phone numbers, cloud resources, and paid services remain subject to customer permissions, budgets, policies, and availability. Developers can use Solid's API to place an agent inside their own product.

Composio is an advanced platform designed to empower AI agents with the ability to execute real-world tasks across multiple applications. It connects agents to over 1,000 tools, enabling seamless interaction with platforms like Slack, Gmail, Notion, and GitHub. The platform automates key processes such as authentication, permission management, and tool execution, reducing development complexity. Composio uses intelligent tool selection to match user intent with the appropriate actions, improving accuracy and efficiency. It also provides secure sandbox environments where workflows can run safely and independently. Developers can create multi-step workflows and automate complex tasks with minimal setup. The platform supports parallel execution, allowing agents to perform multiple operations simultaneously. Composio is model-agnostic, enabling flexibility in choosing AI models without reworking integrations. Its context-aware sessions ensure agents maintain continuity across tasks and interactions. Overall, Composio transforms AI agents into fully functional systems capable of executing real-world workflows.