@JamesWard

My book: https://xitter.cf/t.co/QGevhw6nyE | My podcast: @HappyPathProg | @AWSCloud Agent Experience | @AgenticAIFdn TC | My opinions are mine

 Crested Butte, CO, USA
jamesward.com
Joined February 2007
  • Tweets10.8K
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  • Followers19.4K
501Media
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: github.com/jamesward/zio-typ… - Site for testing CIMD: cimd.now - Support for Mantle in ZIO Bedrock: github.com/jamesward/zio-bed… - Updates to zio-http-mcp for 2026-07-28 MCP spec: github.com/jamesward/zio-htt… - ZIO Evals lib: github.com/jamesward/zio-eva… - ZIO Git lib: github.com/jamesward/zio-git - sbt over MCP & symbol tools: github.com/jamesward/sbt-mcp - sbt-tdepver for easier transitive dep mgmt: github.com/jamesward/sbt-tde… - New Scala & Scala Native buildpacks: github.com/jamesward/buildpa… github.com/jamesward/buildpa…

GitHub - jamesward/zio-typesafe-ai

Contribute to jamesward/zio-typesafe-ai development by creating an account on GitHub.

github.com
James Ward
@JamesWardJun 26
Still cooking! A few more new projects in the past 2 months: - ZIO HTTP MCP client/server library: github.com/jamesward/zio-htt… - ZIO Bedrock library: github.com/jamesward/zio-bed… - sbt revolver alternative for sbt 2.0: github.com/jamesward/sbt-rel… - sbt webjars plugin: github.com/webjars/sbt-webja… - sbt plugin for sass: github.com/jamesward/sbt-sas…

GitHub - jamesward/zio-http-mcp

Contribute to jamesward/zio-http-mcp development by creating an account on GitHub.

github.com
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I just noticed that elide.dev/ uses Pkl for it's build definitions - very cool! A while back I'd experimented with using Pkl for Gradle build defs and became convinced that Pkl is a fantastic option for declarative config. Glad to see Elide go this route.

Elide — One Binary, Many Languages, Native Performance

Native performance in all your favorite languages. A high-performance runtime and toolchain for Kotlin, Java, JavaScript, and TypeScript.

elide.dev
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AWS's @JamesWard goes beyond “hello world” to tackle real-world MCP challenges, from observability to smarter tool design. Catch him at AGNTCon + MCPCon North America as he shares practical patterns for turning basic MCP APIs into robust agent integration interfaces. Register now: bit.ly/4vkntyD
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Long ago it was a developer rite of passage to create a web framework. Last year creating an agent framework was the rite of passage. This year it is agent harness. Get out there and build yourself a harness! You’ll learn a lot and might even create something exceptional.
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JetBrains Air is significantly better than code assistant CLIs and TUIs. ACP-based harnesses w/ ACP UIs are the IDEs of the future.
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Well sbt-mcp was a failed experiment. Turns out that running an MCP server for sbt, from an sbt plugin, has some problems. But from the ashes comes sbta (SBT for Agents). It's just a custom sbt launcher that adds a --mcp flag which starts a STDIO MCP server for sbt, including some useful tools like check (quick compiler - like red squiggles in your IDE) and symbol search / lookup. Check it out: github.com/jamesward/sbta

GitHub - jamesward/sbta

Contribute to jamesward/sbta development by creating an account on GitHub.

github.com
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Yet another Agent Experience focused programming language which supports first class Effects. I think we now have about 30 of these. Great validation of Effects being critical to enabling efficient agent use! While I enjoy seeing all these new languages, I’m still sticking with Scala 3 and ZIO / Kyo as I get all the benefits of these new languages, without the maturity / ecosystem tradeoffs.
Krzysztof Cieślak 💙💛@k_cieslakOct 16
Introducing my new side project - Fai. github.com/Krzysztof-Cieslak… It’s a functional programming language with which I try to explore how we can design better “classical” software engineering tools specifically for AI agents. A couple of design choices I've made are described ⬇️

GitHub - Krzysztof-Cieslak/fai: Programming language for AI age

Programming language for AI age . Contribute to Krzysztof-Cieslak/fai development by creating an account on GitHub.

github.com
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AI Agent Code Mode has become like my crazy uncle. No idea what de talkin bout.
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Ronald Dehuysser, and JobRunr 9, on a Bootiful Podcast xitter.cf/i/broadcasts/1kKzDPXWj…
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James Ward

Ronald Dehuysser, and JobRunr 9, on a Bootiful Podcast

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Cora Iberkleid on a Bootiful Podcast xitter.cf/i/broadcasts/1nJOLQamD…
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James Ward

Cora Iberkleid on a Bootiful Podcast

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Guy Pardon on a Bootiful Podcast xitter.cf/i/broadcasts/1nJOLQaQq…
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James Ward

Guy Pardon on a Bootiful Podcast

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The last moat is you. Not speed, not distribution. Anyone can build anything now. The only thing that can’t be copied is how much you care about something, what you choose to make, and what makes you you. So what do you want to make?
Lenny Rachitsky
@lennysanOct 13
Distribution is not a moat. Execution is not a moat. Brand is not a moat.
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Hardened Buildpacks & Trusted Artifacts (with Cat Edelveis from Bellsoft) xitter.cf/i/broadcasts/1qJDzWqEd…
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James Ward

Hardened Buildpacks & Trusted Artifacts (with Cat Edelveis from Bellsoft)

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Building a Jev-based harness. One interesting thing... You don't need a ToolSearchTool. Just let Jev decide if & what tool to use. Pretty easy optimization that has a dramatic impact on token use & latency.
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Hey concurrency experts... Does this have any real chance of success?
Malte Ubl
@cramforceOct 10
Our goal with a scriptc is to make compiled TS competitive with go and rust. That requires robust multi-threading primitives. Notably, we are not extending JS. These programs run with the same semantics in node but in scriptc you get zero-copy immutable data structures into the worker
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James Ward retweeted
Andrew Lombardi
@kinabaluOct 9
I spent some "clanker" time on a port of @DHH's Campfire rewrite to Kotlin and the JVM. Surprise, attention to architecture actually matters. wecodefire.com/p/kotlin-keep…

Kotlin Keeps Up With Rust

“Porting 37signals’ Campfire to the JVM in a day, byte for byte, and what DHH’s benchmark table is really measuring”

wecodefire.com
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Can the JVM be faster than Ruby or Rust? (Yes) xitter.cf/i/broadcasts/1vJpPNozn…
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James Ward

Can the JVM be faster than Ruby or Rust? (Yes)

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We are at the point that you can imagine software exists, then it does. The next phase is when you can imagine that some else's software does something the creators didn't imagine, then it does.
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One way this will manifest is that application “settings” will go away. Instead, software will be human language customizable. No need to find a setting, which may not even exist. Just tell the software how you want it to be different.
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GraalVM CE compiler confidently beating C++ in inference workloads 🚀🚀🚀 By @TheMukel at #Devoxx
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Here are the slides from my Devoxx talk on MCP 2.0 (aka 2026-07-28) jamesward.github.io/mcp2
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