Claudiu Ivan

github.comGitHub - kioku/aperture: Dynamic CLI generator for OpenAPI specifications designed for AI agents and automationDynamic CLI generator for OpenAPI specifications designed for AI agents and automation - kioku/aperture

6 Mar

Aperture v0.1.9 is live and it adds dependent batch workflows. Capture values from one operation, interpolate them into the next. Chain API calls without writing glue code. Also: --auto-paginate, --body-file for large payloads, and binary size down to < 6 MB.

claudiu-ivan.comComposable Data Access with Lenses | Claudiu IvanReusable and testable nested updates for TypeScript objects.

9 June

This is the article about lenses I wish I had when I first wrote a formula engine. It gets into the details of representing nested data paths in a form that can support a configuration-driven access layer. www.claudiu-ivan.com/writing/data...

github.com/kioku/aperture

10 Mar

It feels somewhat strange for an open source project with a single contributor to have a presentation video. One of those things that's possible now.

Claudiu Ivan@claudiu-ivan.com

22 Feb

It is truly disheartening to see my RSS reader being slowly inundated with Claude’s voice…

claudiu-ivan.comRelease Cadence and the Slowest Feature Trap | Claudiu IvanWhy milestone-based releases silently kill delivery velocity, and how decoupling internal development cadence from client acceptance timelines fixes it.

19 Feb

If a process depends on a specific person’s willpower, then it’s not a process. I go into my view on the topic of release cadence and how to systemize it in my new post. claudiu-ivan.com/writing/rele...

Claudiu Ivan reposted

Martin Kleppmann

@martin.kleppmann.com

18 Feb

The second edition of Designing Data-Intensive Applications, by myself and @chris.blue, is finished and sent off to the printers! Ebooks should be available in the next week, and print books in 3–4 weeks. Sigh of relief. 😅 (BTW, this is a good opportunity to support your favourite local bookshop!)

16 Feb

Aperture v0.1.8 is live and it adds command mappings. Rename operations, add aliases, hide endpoints. Make any OpenAPI spec feel like your own CLI. Also: Nix flake, debug logging, and security hardening. github.com/kioku/aperture

26 Jan

Aperture v0.1.7 adds automatic retry with exponential backoff. It respects Retry-After headers, uses jitter, only retries idempotent methods by default. Also: config management commands, quiet mode for clean pipelines, and now on Homebrew. brew install kioku/tap/aperture github.com/kioku/aperture

20 Jan

TypeScript's type system is compile-time only. Exceptions ignore it. Nullable returns work if someone downstream remembers to check. Wrote about making error handling explicit so the compiler catches it instead of production.

www.claudiu-ivan.com/writing/type...

20 Jan

claudiu-ivan.comType-safe Error Handling | Claudiu IvanExploring Option and Result types in TypeScript, where missing error handling becomes a compile error instead of a production incident.

19 Jan

TypeScript's type system is compile-time only. Exceptions ignore it. Nullable returns technically participate, but only if someone downstream remembers to check (not at 4pm on a Thursday, after the third meeting). There's a reason engineers keep rediscovering Result types.

17 Jan

Think → Act → Observe → Repeat.

15 Jan

TypeScript error handling approaches in the wild: - exceptions (sometimes caught) - nullable returns (sometimes checked) - result types - hoping for the best

Solid reasoning.

Sometimes the genie is amazing. Other times, it forgets to checkout a feature branch and doesn't understand why it can't create a pull request...

Agent sandboxes are quite cool. Today I migrated a Django CMS website I've been maintaining for a decade to an Astro static site. From my phone. While enjoying life.

The thing was getting annoying to maintain. So I linked the repo, asked Claude to crawl and extract static pages, then rebuild in Astro with i18n. It delivered within half an hour, without any supervision.

This site required maintenance every year since it was deployed. Now it should live mostly untouched until it's taken down. That's a day of work I skipped, plus a few hours each year for years to come.

irishtimes.com‘It’s surreal’: US sanctions lock International Criminal Court judge out of daily lifeCanadian judge Kimberly Prost is unable to use credit cards, transfer money or book everyday services in what she calls an attack on the independence of the judiciary

It’s also time to build European solutions. Diverse options will push the international market to offer better products and services for consumers.

🛒 🇪🇺 Buy European 🇪🇺 (+🇨🇦). USA broke up with you. Get over it 🇪🇺💪@buyeuropean.eurosky.social

It’s time to become digitally independent from USA. Ask not what European #DigitalSovereignty can do for you, ask what YOU can do for 🇪🇺 #DigitalSovereignty. An appeaser is one who feeds a crocodile, hoping it will eat him last. Don’t be a digital appeaser. www.irishtimes.com/world/us/202...

24 Aug 2025

Just shipped Aperture v0.1.5! Managed to cut 7.4MB of binary bloat. Down to 3.6MB now. Turns your OpenAPI specs into native CLI tools. Built for agents and automation. github.com/kioku/aperture

15 Aug 2025

With software, good taste sometimes is just knowing when a function should be longer.

claudiu-ivan.comSystematic API Interaction for AI Agents | Claudiu IvanAn in-depth look at the architectural philosophy behind Aperture, a universal API adapter that brings protocol-level rigor to command-line API interactions. This piece details its evolution, pragmatic...

In my work with agent-assisted workflows, I hit a roadblock: giving agents a secure and reliable way to make external API calls. It quickly became clear that this is non-trivial.

I wrote an article detailing this entire journey, from the initial problem statement to the final design decisions. www.claudiu-ivan.com/writing/syst...

Aperture is open-source. Feedback and contributions are welcome. github.com/kioku/aperture

In my work with agent-assisted workflows, I hit a roadblock: giving agents a secure and reliable way to make external API calls. It quickly became clear that this is non-trivial.

Ad-hoc scripts are brittle and don't scale. MCP servers can be too heavy for simple, ephemeral tasks. I needed something with the lightweight ergonomics of a CLI tool.

This led me to build Aperture. The philosophy: treat an OpenAPI specification as an executable program, not just as static documentation. A tool that can ingest any spec and that dynamically generates a secure, self-documenting client.

addxorrol.blogspot.comA non-anthropomorphized view of LLMsIn many discussions where questions of "alignment" or "AI safety" crop up, I am baffled by seriously intelligent people imbuing almost magic...

7 July 2025

The language necessary to describe the phenomena occurring inside LLMs is lacking, so the default is anthropomorphization. addxorrol.blogspot.com/2025/07/a-no...

Claudiu Ivan reposted

Simon Willison

@simonwillison.net

3 July 2025

Quitting programming as a career right now because of LLMs would be like quitting carpentry as a career thanks to the invention of the table saw.

26 June 2025

The number of added lines of code is a terrible performance metric. Instead, the total number could be considered a complexity metric, but even that fails when the code is verbose enough.

martinfowler.comLLMs bring new nature of abstractiona short post

24 June 2025

It’s a fascinating leap. Right now, it seems that my most important task when running an agentic workflow is to keep the output of a stochastic process on a deterministic path.

Martin Fowler@martinfowler.com

NEW POST Gen AI for software development is the biggest jump up in abstraction since assembler to HLLs, but also a jump sideways. martinfowler.com/articles/202...

Claudiu Ivan reposted

Ana Tudor

@anatudor.bsky.social

13 June 2025

I have a new article out. It's about a better technique to create grainy gradients, without the big problem that layering a noise layer brings: altering the original gradient palette (to a greater or lesser extent, depending on the approach used). #CSS #SVG #filter

Master.dev (Formerly Frontend Masters)@frontendmasters.com

Grainy Gradients This is about reducing banding effects in gradients by introducing noise. A nice approach is a displacement map using SVG filters.

frontendmasters.comGrainy GradientsThis is about reducing banding effects in gradients by introducing noise. A nice approach is a displacement map using SVG filters.

4 June 2025

Working with LLM agents is making me think about the old saying: 'be careful what you wish for'

19 May 2025

Romania chose decency over dishonesty. A lot of hardships lie ahead, but right now it seems like we’ll make it.

Claudiu Ivan@claudiu-ivan.com

The lead that the Romanian populist candidate has isn’t small, but he keeps making stupid mistakes, as you would expect from someone with the personality fit for an autocrat. These mistakes, and the work done by good-natured people, are what will change the tide.

Claudiu Ivan reposted

17 May 2025

Replying to @b-anca.bsky.social

It kind of feels like fascist movements are being normalised around the world