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Adversarial behavioural-bias engine — audits your decisions for cognitive biases via your own AI.
Adversarial behavioural-bias engine — audits your decisions for cognitive biases via your own AI.
Remote endpoints: streamable-http: https://irrational.pages.dev/mcp/server
Irrational is a well-designed, stateless MCP server that provides cognitive-bias auditing through a directive-based approach. The codebase is clean, has proper input validation, and contains no authentication (appropriate for a public, read-only service). No credential handling, malicious patterns, or dangerous operations detected. Minor code quality observations do not materially affect security posture. Supply chain analysis found 7 known vulnerabilities in dependencies (2 critical, 0 high severity).
6 files analyzed · 10 issues found
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Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
From the project's GitHub README.
A field guide to the mistakes your mind makes — and an open, adversarial behavioural-bias engine you can call from your own AI or any MCP agent.
→ irrational.pages.dev · Field guide · Connect via MCP · Sources
Irrational runs no AI model. It provides the curated adversarial framework, a 22-bias catalogue, and a stateless scaffold — delivered as a public field guide and an open MCP tool — and the reasoning is done by whatever model you or your agent already have. No API keys. No stored decisions. Nothing leaves you.
A frontier model already knows the biases, so the value isn't informational — it's behavioural: a plain LLM is trained to agree, while Irrational has a fixed adversarial contract (assume you're biased, refuse to validate, argue the other side) that an agent can invoke systematically — even on its own draft reasoning.
You: "We should rewrite our 6-year-old backend from scratch this year — we've already spent two months on a POC that went well, and I'm confident we can finish in six."
THE CALL — Don't greenlight the big-bang rewrite. Carve off the worst module first, with a hard 3-month checkpoint. Confidence the 6-month plan succeeds: ~25% — mostly sunk cost + the planning fallacy.
THE AUDIT — Those "two months on a POC" are gone either way, but they're doing most of the talking (sunk cost). "About six months" is a best-case with no reference class — rewrites of mature systems routinely run 2–3× (planning fallacy)…
Verdict-first, every bias tied to your own words, grounded in a cited catalogue. See the full worked examples →
Listed on the official MCP Registry as io.github.urbanmorph/irrational. Connect any MCP client to the live endpoint — no install, no keys:
# Claude Code
claude mcp add --transport http irrational https://irrational.pages.dev/mcp/server
…or point any MCP client at https://irrational.pages.dev/mcp/server:
{
"mcpServers": {
"irrational": {
"type": "http",
"url": "https://irrational.pages.dev/mcp/server"
}
}
}
Tools: analyze_decision (the adversarial audit) · list_biases · get_bias. Pass language for a reply in another language, or structured: true for parseable JSON.
analyze_decision, list_biases, get_bias. analyze_decision returns a verdict-first directive your model executes. The discipline is ours; the reasoning is yours.Astro (pure static) · Cloudflare Pages · a hand-rolled, dependency-free JSON-RPC MCP endpoint as a Pages Function. No runtime model, no database. Single source of truth: src/data/biases.ts feeds both the web and the MCP.
npm install --ignore-scripts # we don't use image optimization, so skip sharp's native build
npm run dev # http://localhost:4321
npm test # vitest — engine + catalogue (29 tests)
npm run build # static pages
The MCP endpoint is a Cloudflare Pages Function — run it locally with npx wrangler pages dev dist.
Translations, proposed biases, and worked examples are welcome — see CONTRIBUTING.md. This project also publishes a public PDGI scorecard.
Code is MIT. The bias-catalogue text (definitions, examples, and the curated prose in src/data/) is additionally available under CC-BY-4.0. Every claim is cited — see /sources.
Built by Urban Morph.
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