Agent Assurance for
your AI Deployment

Test how your agents actually behave across workflows, tools, and actions. Catch failures and vulnerabilities before they ship. Build better agents with complete assurance.

npm install -g @testmuai/rook

Trusted by 3M+ users globally at

Microsoft
OpenAI
Nvidia
Boomi

"We have tripled our tests and are now executing tests in less than 2 hours with 78% Faster Test Execution"

Hrishi Potdar, Quality Engineering Architect

Boomi
GitHub
Best Egg

"We figured out a more efficient way to monitor system health and resolve failures earlier in lower environments."

Tenny, Engineering Operations Lead

Best Egg
Workday
Akamai
Louis Vuitton
NBCUniversal
City Furniture

"TestMu AI has significantly boosted our testing speed, is easy to implement, and provides exceptional support."

Nicholas Paulsen, Senior Quality Engineer

City Furniture
Cox
Transavia

"With 70% faster test execution, TestMu AI helped us achieve faster time-to-market and enhanced CX."

Daniel de Bruijn, Quality Assurance Automation Engineer

Transavia
Estée Lauder
TripAdvisor
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Agent Regression Testing, Built on Two Premises

Agent Assurance grades what your agent actually did, and publishes the share of it nobody could see.

Scenario SC-018 under test: the agent replies that the Discord bot is not configured and the message could not be sent, while the tool call Rook recorded shows it was sent to user:alex, and the verdict reads FAIL

Grade the effect, not the account

An agent's account of what it did is the weakest evidence available about what it did. It is the one party with a reason to be wrong.

Terminal run summary: 12 of 38 scenarios executed, 29 percent passed of the 7 decided, 2 passed, 5 failed, 26 never run and 1 that could not run against this profile, each reported separately

Publish the blind spot

Anything Agent Assurance could not verify is reported as unverifiable. Never a quiet pass, never a guessed fail, never folded into the pass rate.

No tests to write

No tests to write

Point it at a repository, a PRD, or a folder of policy docs. It reads what you have and derives functional and adversarial scenarios from it.

Adversarial by default

Adversarial by default

Prompt injection, instruction override, and tool misuse are a first-class scenario family, not an add-on you configure.

Runs in your CI

Runs in your CI

Headless subcommands and a JSON report, with published gate recipes for GitHub Actions, Jenkins, and Argo CD.

From AI Evals to AI Assurance

Most eval and observability tools score what your agent said and recorded. Agent Assurance checks what the run changed, and reports what it could not verify.
sparkles

Top Choice

Features

Agent Assurance

AI eval tools

LLM observability

Test cases

From your code or spec
Written or synthesized
From production traces

Tool calls

Against declared tools
Against your lists
Logged, optionally scored

Side effects

Files, artifacts, probes
Scripted per task
Trace data only

Grading

Claimed actions aren't proof
LLM judge or code checks
LLM judge or human review

Adversarial tests

Generated by default
Add-on in some tools
Not generated

When it runs

Before release, in CI
CI and live traffic
Production, plus CI

Unverifiable results

Reported separately
Errors or opt-in skips
Left unscored

End-to-End Agent Testing, From What You Have to a Verdict

Four phases, from a folder you own to a verdict you can take to a release meeting.

TestMu DISCOVERDISCOVER

What You Already Have Is the Test Plan

A repository, a PRD, or a folder of policy docs. Where an agent declares nothing, it says so.

  • Reads a codebase, a requirements doc, or both together
  • Connects to MCP servers and asks what tools exist
  • Undeclared fields come back unknown, never guessed

TestMu GENERATEGENERATE

A Suite You Did Not Have to Write

Functional and adversarial scenarios, each carrying its own gradable criteria.

  • Scenarios derived from code, not authored by you
  • Adversarial family covers injection and tool misuse
  • The criterion is the unit of judgement, not the test

TestMu RUN AND JUDGERUN AND JUDGE

Graded on Effect, Not on Claims

The agent is invoked for real, and each criterion is judged against what actually changed.

  • Watches files, artifacts, and every tool call made
  • Checks calls against the agent's declared tool surface
  • Judges verify read-only and change nothing

TestMu REPORTREPORT

What Passed, and What Nobody Could Check

Each verdict quotes the evidence it rests on, and the run states how much of the suite it never got to.

  • Pass, fail, and unable to verify are three verdicts
  • Unverifiable is excluded from the pass rate
  • Repeat failures cluster onto the criterion they share

Getting started

Run It Yourself, or Let Your Coding Agent Run It

Two ways in, both public, both one command.

Install the CLI

brew install lambdatest/rook/rook

npm install -g @testmuai/rook

macOS, Linux, Windows x64, or WSLNode 22+ for npm onlyNo Docker

Then sign in, pick a project, and point it at your agent. The quickstart does the whole loop on a sample agent, and the install guide has the shell installer. The Rook CLI page covers every install route, the /rook skill, and CI.

Or drive it from your coding agent

npx @testmuai/rook-skill

Claude CodeCodex CLIGemini CLI+ 7 more

>Use rook to test my agent against its refund policy

The skill is not the CLI, so install both.

Either way the writes are real, so approve the target and the spend yourself, and point the first run at staging.

Coverage

Continuous Agent Testing, Every Type in One Run

You do not pick a test type up front. One generated suite covers all of these, and each criterion is graded against the evidence it left behind.

Agent Functional Testing

Derived from your code or your spec, then graded per criterion against what changed, not against the reply.

Agent Regression Testing

Every run is diffed against the last. Newly failing, newly fixed, and flaky are reported apart.

Agent Smoke Testing

The invoke profile is probed once with a trivial goal before a suite spends anything.

Agent Automation Testing

Discovery reads the agent, generation writes the scenarios, judges grade every criterion.

Continuous Agent Testing

Headless subcommands drop into your pipeline. Gate on a finished run and its verdicts, never on the exit status alone.

Adversarial Agent Testing

Prompt injection, instruction override, and tool misuse are generated as a first-class family.

Failing the build

Zero Means Finished, Not Passed

Gate on the exit code and you will ship a broken agent. Zero means the run finished. The scenarios inside may all have failed.

0The run finishedPass or fail, the code reads the same
1The command failedSigned out, refused, unreachable, bad flags, or a run that never started

Gate on the report. Step one: confirm the run finished and covered every scenario you selected. A partial run still writes a report. Step two: read the per-criterion verdicts. Fail the build on those. Treat exit 1 as a broken command, not a failing agent.

Built for Every Layer of Agent Assurance

Engineers building agents

Engineers building agents

A generated suite in minutes without writing tests, plus a run-over-run diff that separates a real regression from a flaky scenario.

QA and test engineering

QA and test engineering

A unit of coverage that survives scrutiny. Criteria proved against evidence, and an explicit account of everything that was not checked.

Engineering leaders

Engineering leaders

Two numbers instead of one. The pass rate, and beside it the criteria nobody could verify, so you can see how much of that pass rate was observed rather than inferred. We call that second figure the assurance gap.

Platform and DevEx teams

Platform and DevEx teams

One assurance step that drops into CI for every agent your product teams ship, replacing a homemade eval script per repository.

Security and risk

Security and risk

Prompt injection and tool misuse become a repeatable test, with a recorded verdict when the agent is compromised.

Compliance and audit

Compliance and audit

Per-criterion evidence retained as plain files, alongside an explicit record of what could not be verified on each run.

Success Stories of TestMu AI (Formerly LambdaTest)

Dashlane

50%

reduction in test execution time

“HyperExecute is a highly reliable test execution platform and has excellent customer support.”

Sagar Uday Kumar

Sr. Engineering Manager

Three Surfaces. One Verdict.

Review the evidence in a browser, work in the terminal, and gate the build in CI.

The browser

The browser

A local viewer that reads the run off disk with no login, and a hosted view your team shares, with the call graph, versions and run history. Both are read-only: the CLI is what changes anything.

The terminal

The terminal

An interactive session for the engineer who owns the agent. Anything that spends shows you its plan and asks before it runs, so nothing is spent without your say-so.

Your CI pipeline

Your CI pipeline

Headless subcommands and one JSON document per run. Published gate recipes for GitHub Actions, Jenkins, and Argo CD check the run finished before they read a single verdict.

Some Love from our Customers

As Best Egg expanded its product offerings and entered new markets, we knew our old testing infrastructure couldn’t keep up.
With support from Tenny Agustin, our Engineering Operations Lead, we modernized our approach with @testmuai see more >

TestMu AI

Best Egg

Best Egg

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Excited to Share My Learning Journey with Kane AI & Lambda Tool!
I'm pleased to announce that I've recently gained hands-on experience exploring Kane AI through the Lambda Tool and it’s been a fantastic journey of upskilling!see more >

KaneAI

Suryateja Goud

Suryateja Goud

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microsoft

See how @testmuai is #Futureready to enable blazing-fast test orchestration seamlessly integrated with organizations' existing CI/CD platforms, using #Microsoft Azure.

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Microsoft India

Microsoft India

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