James Ward

My book: | My podcast: @HappyPathProg | @AWSCloud Agent Experience | @AgenticAIFdn TC | My opinions are mine

[James Ward @JamesWard]

Cooked up some really tasty treats over the past 3 months:
- Various Jev morsels; most importantly a Scala ZIO Jev client with a full agentic loop orchestrator: https://t.co/D5FRHCv7Ai
- Site for testing CIMD: https://t.co/su7fncBsQ0
- Support for Mantle in ZIO Bedrock: https://t.co/UObSA6toxZ
- Updates to zio-http-mcp for 2026-07-28 MCP spec: https://t.co/QJGxjQihnQ
- ZIO Evals lib: https://t.co/xJQTnT7nME
- ZIO Git lib: https://t.co/YI7SCS6Eoy
- sbt over MCP & symbol tools: https://t.co/QvsVNKCwIn
- sbt-tdepver for easier transitive dep mgmt: https://t.co/V3ap7Mm9s6
- New Scala & Scala Native buildpacks: https://t.co/ljHHiHCBQ8
https://t.co/derCQsy4zY

[James Ward @JamesWard]

Still cooking! A few more new projects in the past 2 months:
- ZIO HTTP MCP client/server library: https://t.co/QJGxjQihnQ
- ZIO Bedrock library: https://t.co/GH6ARfRUVo
- sbt revolver alternative for sbt 2.0: https://t.co/vZhsL0aLFS
- sbt webjars plugin: https://t.co/nAxHC90eAk
- sbt plugin for sass: https://t.co/ohpUVZqoNV

[James Ward @JamesWard]

I'm automating the automations

[James Ward @JamesWard]

@rjourdan_net @aiDotEngineer Next: Engineer your factories

[James Ward @JamesWard]

@aramh 💯 For many reasons. Especially that this enables AI agents to have much better understanding of control flow, composition, etc.

[James Ward @JamesWard]

At AGNTCon a few weeks ago @starbuxman and I chatted with @deusaquilus about how to make better MCP servers. check it out: https://t.co/MvgEw1ceeH

[James Ward @JamesWard]

@rakyll that domain is the best! and congrats!!

[James Ward @JamesWard]

@tribbloid For some things I use GraalVM, for some things Scala Native. Kyo has support for Scala Native so where I use Kyo it is Scala Native, otherwise GraalVM.

[James Ward @JamesWard]

Four reasons I still use Scala:
- Agent understanding of code is very high (good types, Effects, expressive)
- Incremental compiles are really fast (JVM, sbt daemon, good caching)
- I’m using Scala native and GraalVM Native Image for more prod servers and having success, but without the long dev compiles
- I can easily review the code because the code is good

[James Ward @JamesWard]

This is awesome! And such a great place for a software factory.

[Clare Liguori @clare_liguori]

AWS Emulator is here!

Building API emulators has been huge for Amazon teams this year. We let agents run against dependencies over and over in a feedback loop, all in the local env. The most popular one internally emulates AWS APIs: it's 100% built by agents and now open source.

Software factory: https://t.co/eLKSTTx347
Blog: https://t.co/IOCf0RafVd
Source code: https://t.co/hY0P8wIcf1
Evals: https://t.co/MMOxFM4avk
User guide: https://t.co/9NYMJT5aUZ

[James Ward @JamesWard]

@senderPath Most of it is open source: https://t.co/a2a6O21xZe

[James Ward @JamesWard]

On the latest Happy Path Programming, @BruceEckel and I chatted with Barry Warsaw - I'm sure every developer has used code he wrote. Check it out: https://t.co/zibAcRTUNE

[James Ward @JamesWard]

@gagu_sh yeah, ADTs and exhaustive pattern matching are one part of what makes this great.

[James Ward @JamesWard]

@ZedLang @LH @BruceEckel @EffectTS_ Nice! I really need to try Zed :)

[James Ward @JamesWard]

Two years ago @BruceEckel, Bill Frasure, and I released the Effect Oriented Programming book. Since then the entire world of programming has changed. But I’m thrilled that the concept is taking off.

Many new Agent-First programming languages are Effect Oriented. @EffectTS_ and related projects like @foldkit & @alchemy_run are reaching the masses.

I am definitely not claiming my book has anything to do with that. I’m really just glad that the concepts are getting out there. And many more developers are discovering a better way to build better software.

[James Ward @JamesWard]

@Savlambda Yes! Many old languages do Effects well. I’m mostly using Scala with ZIO or Kyo and my agents make no mistakes. :)

[James Ward @JamesWard]

@ZedLang @LH @BruceEckel @EffectTS_ Thanks! Books over MCP is the future :) Let me know how it goes!

[James Ward @JamesWard]

@LH @BruceEckel @EffectTS_ @ZedLang woot! yeah, Effects are an amazing fit for Agent-First languages.

[James Ward @JamesWard]

@mcpjams Nice! And maybe I can have my agent do this for me and iterate to full compliance on my code. :)

[James Ward @JamesWard]

@paulmillr What a super cool waste of tokens!

[James Ward @JamesWard]

I can't wait for everyone to vibe their own TLS impl. And their own OS, programming language, runtime! Definitely no bugs gonna happen. Make no mistakes.
Dependencies are so over!

[Jarred Sumner @jarredsumner]

What’s going to happen to open source?

A prediction:

Dependencies are over.

The same Brotli vulnerability impacted .NET, Node, Bun, Envoy and more. Dependencies are too big of a target.

When rewriting a dependency is one prompt away, why take the risk?

[James Ward @JamesWard]

@johncblandii It is the only way my feed stays acceptably interesting.

[James Ward @JamesWard]

I mute a lot of words on this platform.

Some words have memorable reasons for muting, like DAO & NFT.
With others I have no idea why I muted them, like $20 & monkey.

It’d be nice if when I mute a word, I could provide a reference tweet.
I’d really like to know when I should let monkeys back in my feed.