Free Beta Now Open
Give your AI the power of step-by-step reasoning
Thoughtbox is an MCP server that enables LLMs to think methodically through complex problems with branching, revision, and mental models.
Sign up for the Free Beta to get your personal API key
Everything your AI needs to think better
Step-by-Step Reasoning
Record thoughts one at a time with automatic persistence and chain management.
15 Mental Models
Pre-built cognitive frameworks like Five Whys, Pre-mortem, and Trade-off Matrix.
Code Notebook
Execute JavaScript/TypeScript snippets with full state management.
Real-time Observatory
Visualize reasoning chains as they unfold with our live trace viewer.