Checkly llms.txt

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# Checkly

> Checkly is a synthetic monitoring and continuous testing platform for developer-owned reliability.

Checkly helps engineering teams build reliable, performant applications by proactively detecting issues before users do. Unlike traditional monitoring that only tells you when servers are down, Checkly validates that customer-facing workflows actually work.

## When to use Checkly

Reach for Checkly when the job is any of these:

- Verify that a deployed API, endpoint, or user journey actually works right now, from outside the network, from 22+ global regions.
- Turn an existing Playwright test suite into production monitoring without rewriting it.
- Define monitoring as code (TypeScript/JavaScript, Terraform, or Pulumi), version it in Git, and deploy it from CI.
- Get alerted when a scheduled job, cron task, or background worker stops checking in.
- Investigate a failing check with traces, logs, and AI root cause analysis.
- Open, update, and resolve incidents on a branded public status page.

Checkly is not an APM or a log aggregator, and it is not a real user monitoring tool. It observes an application the way a customer does and reports when a user-facing path breaks. For host metrics and log search, use an observability backend alongside it.

### How an agent should call Checkly

- **CLI** (best for creating and deploying monitors): npm package `checkly` (https://www.npmjs.com/package/checkly). Install with `npm install -g checkly`, scaffold with `npx checkly init`, deploy with `npx checkly deploy`. Write commands exit with code 2 and a JSON confirmation envelope that must be explicitly confirmed, so an agent cannot mutate an account by accident.
- **MCP server** (best for reading live state during an incident): `https://api.checklyhq.com/mcp` over Streamable HTTP. Manifest at https://www.checklyhq.com/.well-known/mcp.json
- **Agent Skills** (best for giving an agent Checkly expertise): `npx checkly skills install`. Index at https://www.checklyhq.com/.well-known/agent-skills/index.json
- **REST API** (best for custom integrations): `https://api.checklyhq.com/v1/`, OpenAPI spec at https://www.checklyhq.com/openapi.json

## Platform

The Checkly Platform is made up of three products that work together: from pull-request to post-mortem.

- **Checkly Detect**: Test and monitor applications, services, and infrastructure with uptime monitoring, synthetic monitoring powered by Playwright, and continuous testing across staging, CI/CD, and production.
- **Checkly Communicate**: Notify and inform stakeholders about incidents with rich alerting (Slack, PagerDuty, SMS), branded status pages, and real-time dashboards.
- **Checkly Resolve**: Investigate and resolve incidents faster with OpenTelemetry-based distributed tracing and Rocky AI for AI-powered incident investigation.

## Differentiators

- **Signal Over Noise**: Proactive, outside-in monitoring that delivers actionable signal instead of data overload. Catch user-impacting issues before users do.
- **Monitoring as Code**: Define, version, and manage monitoring as code with CLI, Terraform, and Pulumi providers. No agents required.
- **Developer Experience**: A developer-first platform with CLI, API, and SDK. Engineers define, test, and deploy monitors without leaving Git.
- **Native Playwright Support**: Built natively on Playwright. Reuse the same test scripts from CI for production monitoring.
- **Unified Platform**: Combines synthetic monitoring, distributed tracing, and incident response in a single platform.

## Products

- [Synthetic Monitoring](https://www.checklyhq.com/product/synthetic-monitoring/): Validate real user journeys with full Chromium browser checks powered by Playwright, API checks, and performance metrics like LCP and TTI.
- [API Monitoring](https://www.checklyhq.com/product/api-monitoring/): Programmable API tests that validate payloads, schema, status codes, headers, and performance for REST and GraphQL endpoints.
- [Uptime Monitoring](https://www.checklyhq.com/product/uptime-monitoring/): Monitor availability with URL checks (HTTP/HTTPS), TCP, DNS, and ICMP checks from 22+ global regions at frequencies up to 1 second.
- [Heartbeat Monitoring](https://www.checklyhq.com/product/heartbeat-monitoring/): Monitor cron jobs, scheduled tasks, workers, and data pipelines. Get alerted when jobs fail silently.
- [TCP Monitoring](https://www.checklyhq.com/product/tcp-monitoring/): Low-level connectivity testing for databases, caches, message brokers, and internal microservices.
- [Playwright Check Suites](https://www.checklyhq.com/product/playwright-check-suites/): Run multi-file Playwright test suites natively in production from 22+ global locations.
- [Traces](https://www.checklyhq.com/product/traces/): OpenTelemetry-based distributed tracing that connects failure points to root causes.
- [Alerting](https://www.checklyhq.com/product/alerting/): Rich alerts with screenshots, traces, and logs delivered to Slack, SMS, PagerDuty, OpsGenie, and more.
- [Status Pages](https://www.checklyhq.com/product/status-pages/): Branded, public-facing status pages to communicate availability to customers.
- [Dashboards](https://www.checklyhq.com/product/dashboards/): Internal dashboards for real-time visibility into application health and performance.
- [Monitoring as Code](https://www.checklyhq.com/product/monitoring-as-code/): Define, version, and manage monitoring infrastructure entirely as code. Markdown: https://www.checklyhq.com/product/monitoring-as-code.md
- [CLI](https://www.checklyhq.com/cli/): Developer-first command-line interface for creating, testing, and deploying monitors. Markdown: https://www.checklyhq.com/cli.md
- [Terraform Provider](https://www.checklyhq.com/product/terraform-provider/): Manage Checkly resources with Terraform for infrastructure-as-code workflows.
- [Pulumi Provider](https://www.checklyhq.com/product/pulumi-provider/): Manage Checkly resources with Pulumi for infrastructure-as-code workflows.
- [Private Locations](https://www.checklyhq.com/product/private-locations/): Run monitors from within your own network to test internal services and applications behind firewalls.
- [AI Analysis](https://www.checklyhq.com/product/ai-analysis/): AI-powered analysis and investigation for faster incident resolution.

## Docs

For full documentation, see the [Checkly Docs llms.txt](https://www.checklyhq.com/docs/llms.txt). For a scoped index of just the product pages, see the [Product llms.txt](https://www.checklyhq.com/product/llms.txt).

- [Documentation Home](https://www.checklyhq.com/docs/): Complete Checkly documentation and reference.
- [API Reference](https://www.checklyhq.com/docs/api-reference/overview/): REST API for managing checks, groups, alerts, dashboards, and more.
- [CLI Documentation](https://www.checklyhq.com/docs/cli/overview/): Install, configure, and use the Checkly CLI.
- [Changelog](https://feedback.checklyhq.com/changelog): Latest product updates and releases.

## AI Agents & MCP

- [Agent Skills](https://www.checklyhq.com/docs/ai/skills/): Install Checkly's Configure, Investigate, Communicate, and Manage skills with `npx checkly skills install`. Machine-readable index at https://www.checklyhq.com/.well-known/agent-skills/index.json
- [MCP Server](https://www.checklyhq.com/docs/ai/mcp-server/): Connect MCP clients to `https://api.checklyhq.com/mcp` over Streamable HTTP to inspect checks, test sessions, and RCA, and to manage status page incidents. Manifest at https://www.checklyhq.com/.well-known/mcp.json, server card at https://www.checklyhq.com/.well-known/mcp/server-card.json

## Developer resources

Every resource below lives at a stable, predictable URL.

- [Checkly documentation](https://www.checklyhq.com/docs/): Full product and reference documentation.
- [Checkly API reference](https://www.checklyhq.com/docs/api-reference/overview/): REST API overview, including bearer-token authentication and the required `x-checkly-account` header.
- [Checkly OpenAPI specification](https://www.checklyhq.com/openapi.json): OpenAPI 3.0 spec for the Checkly Public API, 194 operations, every one with an operationId. Also served from https://api.checklyhq.com/openapi.json
- [Checkly CLI](https://www.checklyhq.com/cli/): Product page. Reference docs at https://www.checklyhq.com/docs/cli/overview/ and the npm package at https://www.npmjs.com/package/checkly
- [Checkly MCP server](https://www.checklyhq.com/docs/ai/mcp-server/): Streamable HTTP MCP server. Manifest at https://www.checklyhq.com/.well-known/mcp.json, server card at https://www.checklyhq.com/.well-known/mcp/server-card.json, OAuth metadata at https://api.checklyhq.com/.well-known/oauth-protected-resource
- [Checkly Agent Skills](https://www.checklyhq.com/docs/ai/skills/): Configure, Investigate, Communicate, and Manage skills. Index at https://www.checklyhq.com/.well-known/agent-skills/index.json
- [Checkly webhooks](https://www.checklyhq.com/docs/communicate/alerts/webhooks/): Send check results and alerts to any HTTP endpoint.
- [Checkly Terraform provider](https://registry.terraform.io/providers/checkly/checkly/latest/docs): Manage Checkly resources with Terraform.
- [Checkly Pulumi provider](https://www.checklyhq.com/product/pulumi-provider/): Manage Checkly resources with Pulumi.
- [Checkly on GitHub](https://github.com/checkly): Open-source CLI, providers, and examples.

## Markdown for agents

This site does server-driven content negotiation (https://acceptmarkdown.com). Send `Accept: text/markdown` to any page URL and you get `text/markdown` back instead of HTML; responses carry `Vary: Accept`. Hand-authored markdown twins are also reachable directly:

- https://www.checklyhq.com/home.md (the homepage)
- https://www.checklyhq.com/pricing.md
- https://www.checklyhq.com/product/uptime-monitoring.md
- https://www.checklyhq.com/product/synthetic-monitoring.md
- https://www.checklyhq.com/product/api-monitoring.md
- https://www.checklyhq.com/product/traces.md
- https://www.checklyhq.com/product/monitoring-as-code.md
- https://www.checklyhq.com/cli.md
- https://www.checklyhq.com/ai-reliability.md
- https://www.checklyhq.com/availability/methodology.md
- https://www.checklyhq.com/datadog-alternative.md
- https://www.checklyhq.com/new-relic-alternative.md
- https://www.checklyhq.com/alternative-pingdom.md

Requests for a path that does not exist return HTTP 404 with a markdown body listing where to look next.

## Guides

### Playwright

- [What is Playwright?](https://www.checklyhq.com/docs/learn/playwright/what-is-playwright/): Introduction to the Playwright browser automation framework.
- [Installing Playwright](https://www.checklyhq.com/docs/learn/playwright/how-to-set-up-locally/): How to install and set up Playwright locally.
- [Navigating user interfaces](https://www.checklyhq.com/docs/learn/playwright/navigation/): Navigate pages, click elements, and interact with web UIs using Playwright.
- [Waits and timeouts](https://www.checklyhq.com/docs/learn/playwright/waits-and-timeouts/): Handle dynamic content with Playwright's auto-waiting and timeout configuration.
- [Authentication](https://www.checklyhq.com/docs/learn/playwright/authentication/): Test login flows and manage authentication state in Playwright.
- [Measuring page performance](https://www.checklyhq.com/docs/learn/playwright/performance/): Capture Core Web Vitals and performance metrics with Playwright.
- [Debugging errors](https://www.checklyhq.com/docs/learn/playwright/debugging/): Debug failing Playwright tests with traces, screenshots, and logs.
- [Request interception](https://www.checklyhq.com/docs/learn/playwright/intercept-requests/): Intercept and modify network requests in Playwright tests.
- [Basic selectors](https://www.checklyhq.com/docs/learn/playwright/selectors/): Locate elements using Playwright's built-in selector engine.

### Monitoring

- [What is Monitoring as Code?](https://www.checklyhq.com/docs/learn/monitoring/monitoring-as-code/): Define and manage monitoring infrastructure as code.
- [The Phases of the SDLC](https://www.checklyhq.com/docs/learn/monitoring/intro-to-sdlc/): Understanding the software development lifecycle and where monitoring fits.
- [Web Application Monitoring](https://www.checklyhq.com/docs/learn/monitoring/web-application-monitoring/): Guide to monitoring web applications end-to-end.
- [Frontend Monitoring](https://www.checklyhq.com/docs/learn/monitoring/frontend-monitoring/): Monitor frontend performance, errors, and user experience.

### OpenTelemetry

- [Getting started with Observability](https://www.checklyhq.com/docs/learn/opentelemetry/getting-started-with-observability/): Introduction to observability concepts and OpenTelemetry.
- [How to instrument your application stack](https://www.checklyhq.com/docs/learn/opentelemetry/how-to-instrument/): Add OpenTelemetry instrumentation to your applications.
- [Metrics](https://www.checklyhq.com/docs/learn/opentelemetry/metrics/): Understand and collect metrics with OpenTelemetry.
- [Traces](https://www.checklyhq.com/docs/learn/opentelemetry/traces/): Distributed tracing concepts and implementation with OpenTelemetry.

### Kubernetes

- [Getting started](https://www.checklyhq.com/docs/learn/kubernetes/monitoring-challenges/): Kubernetes monitoring challenges and how to address them.
- [Logging best practices](https://www.checklyhq.com/docs/learn/kubernetes/logging-best-practices/): Best practices for logging in Kubernetes environments.
- [Structured logging](https://www.checklyhq.com/docs/learn/kubernetes/structured-logging/): Implement structured logging in Kubernetes.
- [Events](https://www.checklyhq.com/docs/learn/kubernetes/events/): Monitor and manage Kubernetes events.

## Learn

- [Playwright Guides](https://www.checklyhq.com/docs/learn/playwright/overview/): Comprehensive guides for browser automation and testing with Playwright.
- [Monitoring Guides](https://www.checklyhq.com/docs/learn/monitoring/overview/): Learn monitoring concepts, strategies, and best practices.
- [OpenTelemetry Guides](https://www.checklyhq.com/docs/learn/opentelemetry/overview/): Get started with observability and OpenTelemetry instrumentation.
- [Kubernetes Guides](https://www.checklyhq.com/docs/learn/kubernetes/overview/): Monitor, log, and observe Kubernetes workloads.
- [Blog](https://www.checklyhq.com/blog/): Technical articles, tutorials, and product updates.
- [Blog index for agents](https://www.checklyhq.com/blog/llms.txt): Curated original research, engineering reports, and evergreen technical explainers.
- [Webinars](https://www.checklyhq.com/webinars/): On-demand webinars on monitoring, testing, and reliability.
- [Customer Case Studies](https://www.checklyhq.com/customers/): How engineering teams use Checkly to improve reliability.

## Additional Resources

- [Pricing](https://www.checklyhq.com/pricing/): Plans and pricing for Checkly.
- [Pricing Details (Markdown)](https://www.checklyhq.com/pricing.md): Detailed pricing breakdown with plan comparisons, add-ons, overage rates, and feature comparison tables across Hobby, Starter, Team, and Enterprise plans.
- [Sign Up](https://app.checklyhq.com/signup/): Create a free Checkly account.
- [GitHub](https://github.com/checkly): Checkly open-source projects and examples.
- [Status Page](https://is.checkly.online/): Checkly platform status.