Show HN: Ask-human-mcp – zero-config human-in-loop hatch to stop hallucinations (masonyarbrough.com)

I recently saw a tweet from Sam Bhagwat (Mastra AI's Founder) which mentions that around 60–70% of YC X25 agent companies are building their AI agents in TypeScript.

This stat surprised me because early frameworks like LangChain were originally Python-first. So, why the shift toward TypeScript for building AI agents?

Here are a few possible reasons I’ve understood:

- Many early projects focused on stitching together tools and APIs. That pulled in a lot of frontend/full-stack devs who were already in the TypeScript ecosystem.

- TypeScript’s static types and IDE integration are a huge productivity boost when rapidly iterating on complex logic, chaining tools, or calling LLMs.

- Also, as Sam points out, full-stack devs can ship quickly using TS for both backend and frontend.

- Vercel's AI SDK also played a big role here.

I would love to know your take on this!

Comments (7)

ecesena · 6h ago

I'm not surprised, I don't think it has anything to do with AI, it's the same in blockchain and prob in all other fields.

I think ppl underestimate the cost of context switch between languages, even if you're really proficient in more than one.

If you're a team with 1-2 eng and have to build a frontend, you are forced to use js/ts. Now, if you can keep everything in a monorepo in the same language, you're simply moving faster. And I'm sure people will criticize and bring counter examples... but statistically 60-70% of the teams will just be faster working this way.

My first startup was frontend php, backend python, 2 eng; soon we specialized one working on frontend, the other on backend, it's tedious to context switch. My last startup was typescript for everything, again 2 eng, same code base, same coding style, both iterating on all code. (And daily I work in rust & C, I'm definitely not a frontend eng nor a js/ts enthusiast, I'm just reflecting on efficiency.)

amazingamazing · 4h ago

Makes sense - for front-end there's really no alternative. For back-end node.js is more than fast enough for pretty much any startup.

shams93 · 7h ago

The agent layer is a kind of client and since typescript thanks to node and the browser has become a universal language for client sides, whether the client is used by a human or used agent to agent.

tomasen9987 · 7h ago

This is interesting, TBH the Ease of using FE & BE in Typescript is the reason I think. I'm also using TS for that.

iMax00 · 7h ago

much more easier to built UI

rvz · 7h ago

> - Also, as Sam points out, full-stack devs can ship quickly using TS for both backend and frontend.

Typescript (which is still "Javascript") is extremely immature for a "backend" language.

I can't take anyone seriously if they believe or use such a pseudo-typed language like typescript and especially a weakly typed language with dynamic types on a costly runtime such as Javascript on the backend.

Both of them should stay far away from anything backend.

cianuro_ · 4h ago

There is value in fast iteration and delivery. These are early stage startups, the clock is ticking. I wouldn’t do it with JS but I understand why it would be used.

Now we can argue how good or bad the nodejs (or any alternative JS implementation) is. At the end of the day the objective is most likely to rock the boat enough to be acquired and have a payday. With enough discipline you can get far before the footguns show up.

Show HN: AI game animation sprite generator (godmodeai.cloud)

Show HN: Air Lab – A portable and open air quality measuring device (networkedartifacts.com)

Show HN: Ask-human-mcp – zero-config human-in-loop hatch to stop hallucinations (masonyarbrough.com)

Show HN: A free, fast, and modern vehicle diagnostics tool (github.com)

Show HN: NanoTS – Fast, embeddable, tiny time series database (github.com)

Show HN: Cpdown – Copy any webpage/YouTube subtitle as clean Markdown(LLM-ready) (github.com)

Show HN: Lambduck, a Functional Programming Brainfuck (imjakingit.github.io)

Show HN: Claude Composer (github.com)

Show HN: iOS Screen Time from a REST API (thescreentimenetwork.com)

Show HN: What if code had a lifespan? A morphogenetic computing experiment (nabolitains.github.io)

Show HN: GPT image editing, but for 3D models (adamcad.com)

Show HN: Mustardwatch: Detect what files a program uses, rerun when they change (github.com)

Show HN: Container Use for Agents (github.com)

Show HN: Arxivlens – Save Hours Researching Scientific Literature on ArXiv (arxivlens.com)

Show HN: dbSurface – A Developer Tool for pgvector (github.com)

Show HN: ClickStack – Open-source Datadog alternative by ClickHouse and HyperDX (github.com)

Show HN: Televyze, Your IPTV OS (televyze.com)

Show HN: A photo backup idea – to your own storage, not iCloud/Google (myphoto-vault.netlify.app)

Show HN: Asteroid Impact Probability Tool (b612foundation.org)

Show HN: I made a 3D SVG Renderer that projects textures without rasterization (seve.blog)

Show HN: Kan.bn – An open-source alterative to Trello (github.com)

Show HN: I build one absurd web project every month (absurd.website)

Show HN: String Flux – Simplify everyday string transformations for developers (stringflux.io)

Show HN: I wrote a Java decompiler in pure C language (github.com)

Show HN: SubSparks – I built an AI to turn Reddit pain points into SaaS ideas (subsparks.com)

Show HN: Grab a Random ArXiv Paper (jepedersen.dk)

Show HN: App.build, an open-source AI agent that builds full-stack apps (app.build)

Show HN: Patio – Rent tools, learn DIY, reduce waste (patio.so)

Show HN: Onlook – Open-source, visual-first Cursor for designers (github.com)

Show HN: Localize React apps without rewriting code (github.com)

Show HN: Controlling 3D models with voice and hand gestures (github.com)

Show HN: SQLAlchemy just the core – a better way (github.com)

Show HN: Bridgit – In-Person-First Networking (bridgitsocial.com)

Show HN: Verysmall.site – vibecode single page websites (verysmall.site)

Show HN: A toy version of Wireshark (student project) (github.com)

Show HN: AirAP AirPlay server – AirPlay to an iOS Device (github.com)

Show HN: Gradle plugin for faster Java compiles (github.com)

Show HN: Moon Phase Algorithms for C, Lua, Awk, JavaScript, etc. (github.com)

Show HN: Create LLM graders and run evals in JavaScript with one file (github.com)

Show HN: Ephe – A minimalist open-source Markdown paper for today (github.com)

Show HN: Posture Correction Using AirPods Motion Sensors (github.com)

Show HN: Kobuddy – Send Articles to Your Kobo E-Reader (kobuddy.app)

Show HN: CensorIt – Remove vocals or music from uploaded audio files (censorit.org)

Show HN: Tiptap AI Agent – Add AI workflows to your text editor in minutes

Show HN: EndBOX – A toy-like retro computer for EndBASIC (endbasic.dev)

Show HN: An Alfred workflow to open GCP services and browse resources within (github.com)

Show HN: Solomon's Agent - a CLI to simplify the web (github.com)

Show HN: MBCompass – Android Compass App (github.com)

Show HN: Open a browser by clapping twice (inspired by Iron Man) (github.com)

Show HN: Lightweight Durable Workflows Built on Postgres (github.com)

60–70% of YC X25 Agent Startups Are Using TypeScript

Comments (7)