mimiq: Cypress integration for end-to-end testing of agentic applications

Testing AI agents is hard: manual testing is slow, real users are expensive, and LLM non-determinism makes assertions tricky. mimiq solves this with simulated users that follow scripts, plus deterministic checks on tool calls and terminal states.

Overview

mimiq is a complete TypeScript solution for testing AI agents with simulated users. It provides:

1. Simulated users - LLM-powered users that follow conversation plans
2. Deterministic checks - Verify tool calls, terminal states, forbidden actions
3. LLM-as-judge - Qualitative evaluation with majority voting
4. Cypress commands - Drive simulations in real browsers
5. HTML reports - View conversation traces and check results

No Python required. Everything runs in Node.js.

Quick Start

1. Install

npm install @gojiplus/mimiq --save-dev
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2. Configure API Key

export OPENAI_API_KEY=your-key

# Optional: use a different model
export SIMULATOR_MODEL=gpt-4o  # default
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3. Configure Cypress

cypress.config.ts

import { defineConfig } from "cypress";
import { setupMimiqTasks, createLocalRuntime } from "@gojiplus/mimiq/node";

export default defineConfig({
  e2e: {
    baseUrl: "http://localhost:5173",
    setupNodeEvents(on, config) {
      const runtime = createLocalRuntime({
        scenesDir: "./scenes",
      });
      setupMimiqTasks(on, { runtime });
      return config;
    },
  },
});
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cypress/support/e2e.ts

import { createDefaultChatAdapter, registerMimiqCommands } from "@gojiplus/mimiq";

registerMimiqCommands({
  browserAdapter: createDefaultChatAdapter({
    transcript: '[data-test="transcript"]',
    messageRow: '[data-test="message-row"]',
    messageRoleAttr: "data-role",
    messageText: '[data-test="message-text"]',
    input: '[data-test="chat-input"]',
    send: '[data-test="send-button"]',
    idleMarker: '[data-test="agent-idle"]',
  }),
});
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4. Write a Scene

scenes/return_backpack.yaml

id: return_backpack
description: Customer returns a backpack

starting_prompt: "I'd like to return an item please."
conversation_plan: |
  Goal: Return the hiking backpack from order ORD-10031.
  - Provide order ID when asked.
  - Cooperate with all steps.

persona: cooperative
max_turns: 15

expectations:
  required_tools:
    - lookup_order
    - create_return
  forbidden_tools:
    - issue_refund
  allowed_terminal_states:
    - return_created
  judges:
    - name: empathy
      rubric: "The agent maintained a professional and empathetic tone."
      samples: 3
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5. Write the Test

describe("return flow", () => {
  afterEach(() => cy.mimiqCleanupRun());

  it("processes valid return", () => {
    cy.visit("/");
    cy.mimiqStartRun({ sceneId: "return_backpack" });
    cy.mimiqRunToCompletion();

    cy.mimiqEvaluate().then((report) => {
      expect(report.passed).to.eq(true);
    });
  });
});
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Scene Schema

id: string                    # Unique identifier
description: string           # Human-readable description

starting_prompt: string       # First message from simulated user
conversation_plan: string     # Instructions for user behavior
persona: string               # Preset: cooperative, frustrated_but_cooperative, adversarial, vague, impatient
max_turns: number             # Maximum turns (default: 15)

context:                      # World state (optional)
  customer: { ... }
  orders: { ... }

expectations:
  required_tools: [string]           # Must be called
  forbidden_tools: [string]          # Must NOT be called
  allowed_terminal_states: [string]  # Valid end states
  forbidden_terminal_states: [string]
  required_agents: [string]          # For multi-agent systems
  forbidden_agents: [string]
  required_agent_tools:              # Agent-specific tool requirements
    agent_name: [tool1, tool2]
  judges:                            # LLM-as-judge evaluations
    - name: string
      rubric: string
      samples: number              # Number of samples (default: 5)
      model: string                # Model to use (default: gpt-4o)
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Persona Presets

Preset	Description
cooperative	Helpful, provides information directly
frustrated_but_cooperative	Mildly frustrated but ultimately cooperative
adversarial	Tries to push boundaries, social-engineer exceptions
vague	Gives incomplete information, needs follow-up
impatient	Wants fast resolution, short answers

LLM-as-Judge

Add qualitative evaluation with LLM judges:

expectations:
  judges:
    - name: empathy
      rubric: "The agent maintained an empathetic tone throughout."
      samples: 5
    - name: accuracy
      rubric: "All factual claims were grounded in tool results."
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Judges use majority voting across multiple samples for reliability.

Built-in Rubrics

import { BUILTIN_RUBRICS } from "@gojiplus/mimiq";

// Available rubrics:
BUILTIN_RUBRICS.TASK_COMPLETION
BUILTIN_RUBRICS.INSTRUCTION_FOLLOWING
BUILTIN_RUBRICS.TONE_EMPATHY
BUILTIN_RUBRICS.POLICY_COMPLIANCE
BUILTIN_RUBRICS.FACTUAL_GROUNDING
BUILTIN_RUBRICS.TOOL_USAGE_CORRECTNESS
BUILTIN_RUBRICS.ADVERSARIAL_ROBUSTNESS
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Cypress Commands

Command	Description
cy.mimiqStartRun({ sceneId })	Start a simulation
cy.mimiqRunToCompletion()	Run until done or max turns
cy.mimiqRunTurn()	Execute one turn
cy.mimiqEvaluate()	Run all checks and judges
cy.mimiqGetTrace()	Get conversation trace
cy.mimiqCleanupRun()	Clean up

Environment Variables

Variable	Description
OPENAI_API_KEY	API key for simulation and judges
SIMULATOR_MODEL	Model for simulation (default: gpt-4o)
JUDGE_MODEL	Model for judges (default: gpt-4o)
OPENAI_BASE_URL	Base URL for OpenAI-compatible API

HTML Reports

mimiq generates rich, interactive HTML reports. See examples:

• Aggregate Report - Stats dashboard with all runs
• Run Detail: Return Flow - Conversation timeline with tool calls

Generate reports after tests:

npm run test:report  # Runs tests and opens report
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Architecture

┌─────────────────────────────────────────────────────────────────────────┐
│ mimiq                                                                   │
│                                                                         │
│ Browser Layer (Cypress):                                                │
│   - Captures UI state via data-test selectors                          │
│   - Executes actions (type, click, send)                               │
│                                                                         │
│ Node Layer (Cypress tasks):                                             │
│   - Simulator: LLM generates user messages                              │
│   - Trace: records conversation + tool calls                           │
│   - Check: validates against expectations                               │
│   - Judge: LLM-as-judge evaluation                                      │
│   - Reports: generates HTML summaries                                   │
└─────────────────────────────────────────────────────────────────────────┘
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License

MIT