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Two Agents, One MCP Server: Using a Second Claude as a Harness for the First
development

Two Agents, One MCP Server: Using a Second Claude as a Harness for the First

How to test AI-generated code: a differential-testing pattern over MCP. One agent built my Polish tax calculator and exposed it over MCP. A second Claude Code agent, with no shared context, audited the math against raw broker data and found real bugs. This is what harness engineering looks like in practice.

· 14 min read
ai mcp claude-code +5
Why I'm Choosing Cloudflare and TanStack for My Side Projects
development

Why I'm Choosing Cloudflare and TanStack for My Side Projects

After building with Vercel and Supabase, I switched to Cloudflare and TanStack. Here's why - and what I gained.

· 8 min read
cloudflare tanstack frontend +1
Implementing Leader Election in Golang using Kubernetes API
kubernetes

Implementing Leader Election in Golang using Kubernetes API

Learn how to implement a leader election mechanism in Golang using the Kubernetes API, leveraging lease locks and distributed coordination to ensure reliable task execution in distributed systems.

· 5 min read
golang kubernetes distributed-systems +1
How to setup AWS Site-to-Site VPN with Unifi UDM 🔒
cloud

How to setup AWS Site-to-Site VPN with Unifi UDM 🔒

Site-to-Site VPN allows connecting local network with AWS VPC. This blog is a step-by-step instruction to establish connection

· 7 min read
aws vpn unifi +1
How to configure parallelism in HCP Terraform
cloud

How to configure parallelism in HCP Terraform

Speed up terraform plan and apply 4x in HCP Terraform. Configure TFE_PARALLELISM or per-stage TF_CLI_ARGS_plan/apply via workspace variable sets.

· 3 min read
terraform terraform-cloud performance
How to enable debug and trace logs in HCP Terraform and Terraform Enterprise
cloud

How to enable debug and trace logs in HCP Terraform and Terraform Enterprise

Enable TF_LOG=TRACE/DEBUG in HCP Terraform and Terraform Enterprise remote runs via workspace variables. Includes local execution fallback for fast iteration.

· 2 min read
terraform terraform-cloud debugging
How to debug Istio Upstream Reset 502 UPE (old 503 UC)
kubernetes

How to debug Istio Upstream Reset 502 UPE (old 503 UC)

Fix Istio 502 UPE upstream_reset_before_response_started{protocol_error} errors. Real debug walkthrough using Envoy logs, Wireshark, and ksniff.

· 6 min read
istio kubernetes debugging +1
Deploy your first blockchain contract to Ethereum
development

Deploy your first blockchain contract to Ethereum

Step by step guide to deploy first contract on Ethereum blockchain

· 3 min read
ethereum blockchain solidity +1
How to label GitLab notification in Gmail by headers?
development

How to label GitLab notification in Gmail by headers?

You can label emails by headers in Gmail. To do this you have to create a script that periodically scans for new emails in your inbox. To demonstrate it I will use Gitlab notifications and we will add labels to messages basing on their headers

· 6 min read
gitlab gmail google-apps-script +1