# Checkly Blog

> Curated original research, engineering reports, and evergreen technical explainers from the Checkly team.

For the complete chronological archive, see https://www.checklyhq.com/blog/. For product documentation and API references, use https://www.checklyhq.com/docs/llms.txt. This file highlights articles with first-hand evidence or durable explanations rather than attempting to list every post.

## Original research and engineering reports

- [We Let AI Agents Rewrite a 92M-Message-a-Day Service in Go. Zero Incidents.](https://www.checklyhq.com/blog/agentic-rewrite-nodejs-to-go/): A production migration report covering the black-box test harness, golden-file parity, deployment controls, and observed infrastructure results.
- [CLIs are more token-efficient than MCP. Or are they?](https://www.checklyhq.com/blog/mcp-vs-cli-token-efficiency/): A technical comparison of modern CLI and MCP context costs, including lazy tool loading and resource-linked browser snapshots.
- [The Current State of Content Negotiation for AI Agents](https://www.checklyhq.com/blog/state-of-ai-agent-content-negotation/): Tests of agent request headers and a practical analysis of serving Markdown through HTTP content negotiation.
- [How Upstash Monitors Every Redis Replica with Checkly](https://www.checklyhq.com/blog/how-upstash-monitors-every-redis-replica-with-checkly/): A customer implementation using Terraform and uptime monitoring across a distributed Redis estate.

## Playwright and synthetic monitoring

- [Why use Playwright and Checkly for Synthetic Monitoring?](https://www.checklyhq.com/blog/synthetic-monitoring-with-checkly-and-playwright-test/): Why scheduled Playwright user journeys complement CI tests and how browser automation maps to production monitoring.
- [What are Playwright Check Suites?](https://www.checklyhq.com/blog/what-are-playwright-check-suites/): How existing Playwright projects and selected tests become scheduled, location-aware production monitors.
- [How to Monitor a Shopify Store with Playwright and Checkly](https://www.checklyhq.com/blog/monitoring-shopify-store-playwright-checkly/): A practical monitoring-as-code example for critical e-commerce flows.

## Uptime and network monitoring

- [Build vs. Buy: Uptime Monitoring](https://www.checklyhq.com/blog/build-vs-buy-uptime-monitoring/): The operational capabilities and maintenance costs to evaluate before building a monitoring service in-house.
- [What is ICMP monitoring?](https://www.checklyhq.com/blog/icmp-monitoring/): How scheduled ping requests measure reachability, latency, and packet loss, with Checkly configuration examples.

## Choosing the right page

- Use the blog for explanations, implementation stories, original measurements, and dated opinions.
- Use [Checkly Docs](https://www.checklyhq.com/docs/) for current product behavior and configuration reference.
- Use [Product pages](https://www.checklyhq.com/product/llms.txt) for capability and buying information.
- Use [Comparison pages](https://www.checklyhq.com/datadog-alternative/) for current commercial evaluation; dated comparison articles may contain historical pricing or product details.

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