Open source

Open-source tools by D. Klincharski, built around repeated engineering work: setting up a workstation, deploying infrastructure, checking cloud accounts, and finding failed pipelines. Browse the repositories alongside notes and experiments explaining the work behind them.

About D. Klincharski

Builds / Tools / Labs

Projects to explore.

01 Open source DevOps SetupBootstrap consistent Windows and macOS engineering workstations from maintained package lists. Explore project 02 Open source AITOSet up token-efficient AI coding workflows and measure the results. Explore project 03 Open source Terraform ECS / FargateAn AWS reference stack connecting containers, load balancing, storage, and optional data services. Explore project 04 Open source CostHiveCombine open-source FinOps scans into a report ranked by estimated AWS savings and confidence. Explore project 05 Open source SentryHiveRun established AWS security scanners with one read-only command and produce a traceable report. Explore project 06 Open source PipelineHiveSee GitHub Actions pipeline health across selected repositories and jump straight to failed jobs. Explore project

Articles / Experiments

Notes from the work.

01 Sep 09, 2026 I scanned an AWS account with 4 open-source FinOps tools. Here's what each one missed.Infracost, Komiser, Cloud Custodian and OpenCost, run against the same account. Each found something the others could not see, and all four shared the same blind spots. Journal · 6 min 02 Aug 26, 2026 How I audit an AWS account with Prowler, ScoutSuite and SteampipeA practical walkthrough of the three open-source tools I reach for when someone hands me an unfamiliar AWS account and asks "is this okay?" Journal · 5 min 03 Jul 28, 2026 MCP v2 Migration Guide: What Changed and Should You Upgrade?A practical MCP v2 migration guide covering SDK changes, the stateless 2026 protocol, compatibility risks, and when upgrading is worth it. Technical blog · 10 min 04 Jul 28, 2026 Should Every MCP Server Ship with an Agent Skill?An MCP server must stand on its own. Learn when an optional agent skill adds real value—and when it only hides a poor interface. Technical blog · 10 min 05 Jul 28, 2026 15 Rules for Designing Token-Efficient MCP APIs for AI AgentsFifteen practical rules for MCP APIs that reduce tool calls, context bloat, latency, and cost without starving AI agents of useful data. Technical blog · 14 min 06 Jul 23, 2026 The small tools we built for ourselves and decided to give awayOur open-source toolbox came out of daily annoyances, not a product plan. Here's what each tool does and why we use it ourselves. Technical blog · 3 min

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