The Mentarium Decision Coach
Describe a decision to Claude or ChatGPT and it walks you through the Mentarium Decision Loop, scores how much process the decision deserves, picks the right Model Stack and checks your reasoning with the Bias Radar. Free, no account.
Your connector URL
https://mentarium.io/mcp
Connect it
Claude (claude.ai and the desktop app)
- Open Settings, then Connectors.
- Choose Add custom connector, name it "Mentarium", paste the URL above and save.
- In a chat, turn the connector on and say: "Help me decide whether to ..."
ChatGPT
- Turn on developer mode in Settings, Apps & Connectors, Advanced (needed for custom connectors).
- Create a connector, paste the URL above, no authentication.
- Pick it in a new chat and describe your decision.
Claude Code and other MCP clients
claude mcp add --transport http mentarium https://mentarium.io/mcpWhat it can do
| Tool | What it does |
|---|---|
decide_start | Starts the Decision Loop for your decision: the steps and their questions, the Decision Weight Score rubric, the Bias Radar and matching Model Stacks. |
decide_score | Computes the Decision Weight Score from reversibility, impact and uncertainty. |
decide_stack | Suggests the 3 models to combine for your situation, with their trigger questions. |
bias_check | Runs the Bias Radar for career, money, relationship or business decisions against your reasoning. |
models_search / models_get | Searches and reads every mental model and bias in the library, with links back to the full pages. |
It is read-only: it never stores your decisions and has no access to anything else in your account. The assistant does the talking; the method comes from Mentarium.
Want to keep your decisions?
The Decision Journal gives you the log, review queue and calibration dashboard in Obsidian. The coach ends each decision with an entry ready to paste into it.