Pillar App Copilot

Pillar is an open-source copilot SDK that converts user requests into executable actions within applications through drop-in React components. It includes a reasoning engine for planning and executing tool calls, automatic documentation crawling for knowledge bases, and supports multi-model backends including OpenAI, Anthropic, Google, and Groq — all running client-side. Ships with a standards-compliant MCP server and WebMCP support so you can power top models and agent workflows through Pillar. We crawl your docs and integrate with your content sources. Same session, same auth—no token passing. When a user gets stuck, easily copy a prompt from Pillar to your AI coding tool to create a new action directing the model on what to do. Notable functionality spans drop-in react components, reasoning engine with tool calls, and auto-crawling knowledge base. Additional tools cover multi-model support, client-side architecture, webmcp integration. Basic access is free, while premium subscriptions provide expanded features and priority support. Key focus areas include ai, SDK, developer, open source, making it relevant across multiple code development scenarios.