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Irrational MCP server

by urbanmorph·io.github.urbanmorph/irrational·v0.1.0
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Adversarial behavioural-bias engine — audits your decisions for cognitive biases via your own AI.

B83/100grade B
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Safety scan
B83/100

full report

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If you have run it, two minutes of your experience saves the next person an afternoon.

Irrational tools (3)

write = sends, deletes, buys or posts
  • analyze_decisionFree

    Adversarially audit a decision for cognitive biases. Returns a directive YOUR model executes to produce the composed audit (verdict-first). Provide reasoning, not just the conclusion.

  • get_biasFree

    Get the full entry for one bias by id.

  • list_biasesFree

    List the 22-bias catalogue, optionally filtered by family.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 218ms20/20
  • Tool poisoning3 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 101 days ago8/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year9/10
Overall 83/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

What the publisher says

From the Irrational repository's README, as published. We do not edit it. Read it on GitHub

Irrational

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.

What an audit looks like

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 →

Add it to your AI

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: analyzedecision (the adversarial audit) · listbiases · get_bias. Pass language for a reply in another language, or structured: true for parseable JSON.

What's inside

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Install directly

claude mcp add --transport http irrational https://irrational.pages.dev/mcp/server
Add to Cursor

Irrational: common questions

Is Irrational MCP server safe?
Mostly: it is graded B (83/100). Read the Irrational safety report
How do I install Irrational?
It runs remotely at irrational.pages.dev. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Irrational need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Irrational maintained?
The last commit was 101 days ago (2026-06-18). The latest release is v0.1.0.
Is Irrational up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.

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