# Descartes

> Use this tool when you need to critically evaluate plans and decisions by identifying and challenging assumptions. Descartes iteratively refines plans by grounding assumptions in real evidence, surfacing only the truly blocking questions to ensure more robust decision-making. It takes in plans and assumptions as input and outputs refined plans with evidenced-based justifications.

Canonical page: https://skillsregistry.net/skills/pranjalbhatia710-descartes-mcp  
JSON: https://api.skillsregistry.net/v1/skills/pranjalbhatia710-descartes-mcp

## Description

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.

## Trust

- **Trust score (0–1):** 0.69
- **Verification tier:** scanned
- **Last scanned:** 2026-08-31

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-08-31

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/rl9nh5u1ii)
- **Repository:** <https://github.com/pranjalbhatia710/descartes-mcp>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "pranjalbhatia710-descartes-mcp"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/pranjalbhatia710-descartes-mcp` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/pranjalbhatia710-descartes-mcp/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt