Yar Kravtsov

Yar can now serve HTTP.

Docker cache problems are often Dockerfile problems: unstable inputs, bad COPY order, and layers that depend on too much.

A CLI is both a user interface and an API for scripts.

Bigger prompts do not fix drifting agent plans.

Most complaints about coding agents are complaints about empty context.

Claude Opus 4.7 scores 87.6% on SWE-Bench Verified.

Production has dashboards, alerts, and logs.

Your CI pipeline builds the same Docker image three times, a dependency bot eats your runner fleet, and nobody fixes it because nobody owns the system.

The pitch is obvious: per-PR environments, live links, faster feedback.

A backend engineer with no game dev background picked up Godot 4 and built a horror FPS.

Yar needed imports across project boundaries, so I built a small package manager: Git dependencies, alias-based imports, content-addressed caching, transitive resolution, lockfiles, and no registry.

Implementing a garbage collector for the Yar compiler meant conservative stack scanning, mark-and-sweep, setjmp for registers, heap growth targets, and one ugly thread-safety constraint.

Most languages add tooling years after the compiler.

Four months ago I asked ChatGPT a dumb question while walking my dog.

I thought streaming was the ethical upgrade from piracy.

Four real examples from recent Go CLI projects — bracketed paste handling, a scripting DSL, safe symlink restoration, and diff truncation — that show how small decisions separate a script from a tool people trust.

Why I built mokapot — a single Go binary that speaks SQS and SNS well enough for real AWS SDKs to connect without configuration changes.

Stateless agents repeat mistakes. lgtm and snap use a findings file, shared codebase context, and recovery loops so later tasks can use what earlier tasks already learned.

Defining the ‘Gold Standard’ for production-ready CLIs: TTY-aware behavior, clean stdout vs stderr contracts, JSON output for automation, and idempotent mutations.

A toast notification does not need React, a provider, a portal, or a bundle.

I moved this blog from VitePress to Hugo because it is mostly text.

Lnk moves dotfiles into ~/.config/lnk, leaves relative symlinks behind, supports host-specific files, and runs bootstrap scripts.

One prompt works for small hacks.

pin is a Go spinner with colors, prefixes, message updates, pipe detection, and no external dependencies.

SSL certificates should be boring.

FTL deploys Docker apps over SSH with one YAML file, no required registry, Nginx routing, SSL, health checks, and deployment hooks.

I needed a spinner for a Go CLI and ended up inside a UI architecture.

Docker networking gets a lot easier once you separate internal ports from host port mappings.

Go 1.23 added range-over-function iterators and the iter package.

NextJS App Router does not require Vercel.

git-gen is a bash script that sends staged diffs to Claude and gets back a commit message draft.

Go uses names for more than readability.