ai-agent-book/slides/lesson-22.md

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theme	title	info	author	transition	mdc	lineNumbers	monaco	aspectRatio	canvasWidth	layout	class
seriph	Lesson 22 — How Do You Test an Agent Instead of Its Final Answer?	English video course for AI Agents in Depth	Bojie Li	slide-left	true	false	false	16/9	980	cover	cover

Improve · Chapter 6 · Agent Evaluation

How Do You Test an Agent Instead of Its Final Answer?

Environments, state, datasets, and executable verification

Lesson 22 of 42 · 18 minutes · Automated Evaluation Environment; Evaluation Task Datasets; Simulation Environments

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Improve · Chapter 6 · Agent Evaluation

Problems this chapter will solve

Lesson 22

How Do You Test an Agent Instead of Its Final Answer?

Lesson 23

How Do You Judge Quality Without Hiding Failure?

Lesson 24

Which Agent Should You Ship?

Lesson 25

Did the Agent Improve—or Did the Numbers Move?

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Why this problem matters

Initial state

Every run begins from the same controllable world.

Interaction

The Agent receives realistic tools, errors, and user disclosures.

Verification

Success is read from external state—not self-reported.

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Three ideas to keep in view

Dataset

Initial state + goal + boundary cases + success criteria

Environment

State transitions, reset, tools, and termination

Protocol

Tool-only tasks or progressive user simulation

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The book's visual model

Tool-calling and human-computer interaction evaluation environments

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Answer benchmark vs. Agent evaluation

Answer benchmark

• One prompt
• One response
• String or judge score

Agent evaluation

• Mutable state
• Multi-turn trajectory
• Executable outcome checks

An Agent can say the right thing while changing the world incorrectly.

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Reset, act, and inspect

state = environment.reset(case.seed)
trajectory = agent.run(case.goal, environment.tools)
outcome = environment.snapshot()
passed = verifier.check(outcome, trajectory)
store(case, trajectory, outcome, passed)

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Test the claim

Evaluation control2 min

Score a reporting Agent from external state

Observe: Tool-call correctness, arithmetic, evidence citations, and unsupported-claim vetoes

Demo budget: 2 minutes · one contiguous terminal block

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class: course-terminal

Live demo

Switching to the terminal

$ cd chapter6/public-health-reporting-eval && python demo.py

Run the command(s), narrate decisions, and point to the observation—not just the output.

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What the evidence supports

Finding 1

A resettable environment turns a trajectory into a repeatable experiment.

Finding 2

Progressive disclosure tests whether an Agent knows what to ask.

Finding 3

Objective state checks are stronger than judging the final prose alone.

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layout: center

Where the claim stops

Boundary condition

A simulator is useful only within its fidelity envelope; its omissions and biases become the Agent's test world.

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Engineering takeaway

Design rule

Define the initial state, allowed transitions, and external success check before writing evaluation prompts.

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Continue the experiment · 1/2

Experiments 6-1 and 6-2: tau2-bench chapter6/tau2-bench/ Terminal-Bench reproduction chapter6/terminal-bench/ SWE-bench reproduction chapter6/SWE-bench/ GAIA reproduction chapter6/GAIA/

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Continue the experiment · 2/2

OSWorld reproduction chapter6/OSWorld/ AndroidWorld source and analysis chapter6/android-world/ OpenVLA + RoboTwin2 design chapter6/openvla-robotwin2-eval/

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layout: center class: text-center

Pause and apply

Your turn

Which production state would reveal success even if the Agent's final message were hidden?

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Next · Lesson 23

Turn observable outcomes into metrics that are consistent, diagnostic, and hard to game.

→