Descartes is an MCP server that iteratively doubts and refines plans by grounding every assumption in real evidence, ensuring no unexamined assumption reaches the work. It helps users make more robust decisions by surfacing only the truly blocking questions.
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process.env. You'll be asked to provide them before it can run.EXA_API_KEY— is independent: set it to ground world doubts in any mode.OPENROUTER_MODELFIREWORKS_API_KEY— a panel of distinct Fireworks model families. Agreement = settled; disagreement = real uncertainty → the doubt is escalated.OPENROUTER_API_KEY— single-model "Claude alone" via OpenRouter (fallback when sampling is unavailable).NO_COLORDESCARTES_VERBOSE— 1 to also stream compact progress to the server's stderr[](https://m8ven.ai/mcp/pranjalbhatia710-descartes-mcp-1pm0qd)