Prompt Tax turns agent overhead into a receipt.
Pick a real-ish agent setup, choose a model, and see how much invisible context the agent carries before your prompt: tokens, context-window percentage, word equivalent, and estimated input price.
Interactive context receipt — configurations, model dropdown, pricing, token receipt, shareable URL state.
Full-screen version →Every instruction, file, memory, and tool schema has to be carried by the model.
One prompt is cheap; an always-on agent with retries, RAG, and tools can get heavy fast.
Once the tax is visible, you can prune, route, cache, split, or code the problem directly.