Agentic Check Construct

Learn how to configure Agentic Checks with the Checkly CLI.

Learn more about Agentic Checks in the Agentic Checks overview.

Use Agentic Checks to monitor user journeys from a natural-language prompt. The agent discovers the target, creates a reusable check script, and can self-heal when the saved script starts failing.

Prerequisites

Before creating Agentic Checks, ensure you have:

• An initialized Checkly CLI project
• Access to Agentic Checks on your Checkly account
• Available Agentic Check active capacity if the check is active
• Any required test credentials saved as Checkly variables or secrets

For additional setup information, see CLI overview.

Basic Example

import { AgenticCheck, Frequency } from 'checkly/constructs'

new AgenticCheck('homepage-health', {
  name: 'Homepage Health Check',
  prompt: 'Navigate to https://example.com and verify the page loads correctly.',
  activated: true,
  frequency: Frequency.EVERY_1H,
})

Configuration

The Agentic Check configuration consists of Agentic-specific options and a subset of inherited general check options.

Agentic Check

Parameter	Type	Required	Default	Description
prompt	string	Yes	-	Monitoring goal the agent should verify. Maximum 10,000 characters.
frequency	AgenticCheckFrequency	No	Frequency.EVERY_30M	How often the check should run. Agentic Checks support the same frequency values as other checks, down to 5 minutes.
agentRuntime	object	No	{ skills: [] }	Extra runtime skills the agent is allowed to use during execution.

General Check

Property	Type	Required	Default	Description
name	string	Yes	-	Friendly name for your check
description	string	No	null	Description of the check. Supports markdown. Max 500 characters
activated	boolean	No	true	Whether the check is enabled
alertChannels	AlertChannel[]	No	[]	Alert channels for notifications
alertEscalationPolicy	AlertEscalationPolicy	No	-	Advanced alert settings
group	CheckGroup	No	-	The CheckGroup this check belongs to
locations	(keyof Region)[]	No	Project default or ['us-east-1']	Public Checkly locations where the check runs
muted	boolean	No	false	Whether alert notifications are muted
tags	string[]	No	[]	Tags to organize checks
testOnly	boolean	No	false	Only run with test, not during deploy

The Agentic Check construct intentionally does not expose privateLocations, runParallel, retryStrategy, shouldFail, doubleCheck, or triggerIncident. These options are not currently honored for Agentic Checks.

prompt

The monitoring goal the agent should verify. Write the prompt in terms of user-visible behavior and expected outcomes.

See Prompt best practices for guidance on scope, strictness, and nondeterministic flows.

A reliable Agentic Check prompt usually states:

• Goal: The user journey or system behavior to monitor.
• What you are given: The start URL, test account context, and any required variables or secrets using {{VARIABLE_NAME}} notation.
• Success looks like: The exact outcome that should pass.
• Failure looks like: The states that should fail the check.
• Strictness: Whether the agent should assert exact values or evaluate the outcome more flexibly.

new AgenticCheck('checkout-flow', {
  name: 'Checkout Flow',
  prompt: `
    Go to https://shop.example.com.
    Sign in with the test account.
    Add one item to the cart and verify the checkout review page loads.
  `,
})

Use stricter prompts when the output should be predictable:

new AgenticCheck('login-flow', {
  name: 'Login Flow',
  prompt: `
    ## Goal
    Sign in to https://app.example.com/login and confirm the dashboard loads.

    ## What you are given
    Use {{TEST_USER_EMAIL}} and {{TEST_USER_PASSWORD}} from the environment.

    ## Success looks like
    The authenticated dashboard is visible, the account name appears, and the final URL is inside app.example.com.

    ## Failure looks like
    The login form rejects valid credentials, the page stays on the login screen, an MFA prompt blocks the flow, or the dashboard shows a 4xx/5xx error.
  `,
})

Use outcome-based prompts when the application is intentionally nondeterministic:

new AgenticCheck('support-assistant-flow', {
  name: 'Support Assistant Flow',
  prompt: `
    ## Goal
    Verify that the support assistant can help a user understand how to update billing details.

    ## What you are given
    Start at https://app.example.com/support and ask: "How do I update my billing details?"

    ## Success looks like
    The assistant gives a relevant answer, asks for missing context if needed, and guides the user toward a billing-settings or support handoff path.

    ## Failure looks like
    The assistant does not respond, answers an unrelated question, loops without progress, or gives instructions that cannot lead to completion.
  `,
})

Keep prompts focused on one flow. If you want to monitor navigation, login, and record creation, create separate Agentic Checks for each flow.

frequency

How often the Agentic Check should run. Use one of the supported Frequency constants or the equivalent number of minutes.

import { AgenticCheck, Frequency } from 'checkly/constructs'

new AgenticCheck('hourly-agentic-check', {
  name: 'Hourly Agentic Check',
  prompt: 'Verify the homepage and pricing page load correctly.',
  frequency: Frequency.EVERY_1H,
})

Supported values: 5, 10, 15, 30, 60, 120, 180, 360, 720, and 1440.

locations

Public Checkly locations where the Agentic Check should run. Accounts can select up to three locations by default. Enterprise accounts can contact sales for unlimited locations.

new AgenticCheck('regional-login-flow', {
  name: 'Regional Login Flow',
  prompt: 'Verify that a user can sign in and reach the dashboard.',
  locations: ['us-east-1', 'eu-west-1', 'ap-southeast-1'],
})

agentRuntime

Controls extra skills the agent can access while executing the check.

Parameter	Type	Required	Default	Description
skills	string[]	No	[]	Extra skill packages to load into the agent runtime.

Reference account variables and secrets in the prompt with double curly brackets, such as {{API_TOKEN}}. This is the only supported way to expose account variables and secrets to an Agentic Check. The AgenticCheck construct does not expose a separate environment-variable option.

new AgenticCheck('web-quality-check', {
  name: 'Web Quality Check',
  prompt: 'Review the homepage and verify that the main navigation and primary call to action are usable.',
  agentRuntime: {
    skills: ['addyosmani/web-quality-skills'],
  },
})

Do not paste secret values into the prompt. Store secrets in Checkly and reference them by name, for example {{TEST_USER_PASSWORD}}.

Billing behavior

Agentic Checks use active-capacity billing. Active checks consume capacity; inactive checks do not. Use activated: false to keep an Agentic Check as a deployed draft without consuming active capacity.

new AgenticCheck('draft-agentic-check', {
  name: 'Draft Agentic Check',
  prompt: 'Verify the account settings page loads for a signed-in user.',
  activated: false,
})

If an active Agentic Check would exceed your available capacity, deployment fails with a billing entitlement error. Deactivate an existing Agentic Check or purchase additional Agentic Check capacity before deploying.