Pydantic's Monty A minimal, secure Python interpreter written in Rust for use by AI. github.com/pydantic/monty

Rust continues its march to power all of the Python ecosystem... Samuel Colvin of @pydantic.dev just announced Monty, "a minimal, secure Python interpreter written in Rust for use by AI" Learn more about the 🐍 + 🦀 magic happening at Pydantic with our podcast linked below:

Podcast with Pydantic: filtra.io/rust/intervi...

We’re gearing up for our first SurrealDB Stream of 2026. On Jan 8, join @sa.muelcolvin.com (CEO and Founder at @pydantic.dev) and our own Tobie Morgan Hitchcock to explore the practical challenges of taking Graph-RAG agents from experiment to production with SurrealDB and Pydantic AI.👇

Thanks to @pydantic.dev for inviting us to be part of the Py AI Festive Meetup in London. A great evening of lightning sessions from Pydantic, WALT Labs, and our own @martinschaer.bsky.social, with plenty of good conversation in between. Thanks as well to Google Cloud for hosting.

Samuel Colvin is the creator of @pydantic.dev and Pydantic AI. He joins Gregor Vand to talk about Pydantic origin, type safe AI applications, Pydantic AI’s evolution, LogFire observability, and the future of sustainable open-source AI tooling. @sa.muelcolvin.com bit.ly/3Mj4SkE

Some personal (very belated*) news, I've moved to the bay area! Let me know if you're in SF or Palo Alto and want to get coffee. Also, last reminder that we have the inaugural Py AI meetup with @pydantic.dev in SF on Tuesday. Register now: luma.com/gjtfecc7 * I actually got here in the summer.

I wrote a tutorial on integrating DBOS with Logfire. It's super easy to set up (kudos to the @pydantic.dev team!) -> just a few lines to configure the exporter and your Logfire write token. Once it's running, you'll get a unified view of your app with logs + traces in one place.

I'm teaming up with @sa.muelcolvin.com to launch a new meetup series, Py AI. Our first one is November 11 in San Francisco with talks from @pydantic.dev, @modal-labs.bsky.social, ReductoAI and @fastmcp.bsky.social. Hosted by our friends at pebblebed.com RSVP here: luma.com/gjtfecc7

Just putting this here. Not much more to say. @pydantic.dev

New social icon for @opensourcepledge.com spotted on @pydantic.dev's website. Lookin' sharp! 👀

Several people (thanks to @mitsuhiko.at and @sa.muelcolvin.com) noted early on that DBOS had too many dependencies. In the latest Python release, we trimmed it down to just 6 direct deps while still implementing durable workflows and queues in one library. It's lightweight (for real).

You made my day @pydantic.dev 😁 pydantic.dev/articles/pyd...

ICYMI, #Heroku support for @pydantic.dev#Herokuis here. To get started, all you have to do is provision Managed Inference and Agents from Heroku Elements or via the command line. 🔗 https://sforce.co/3Ii73mR

Pydantic AI now supports AG-UI - an open protocol for building chat agents, meaning you can use existing frontend apps to interact with @pydantic.dev AI agents. ai.pydantic.dev/ag-ui/#agent...

Podcast with @sa.muelcolvin.com on Software Engineering Radio is out! Covers the @pydantic.dev ecosystem including Pydantic Validation, Pydantic AI and @logfire.pydantic.dev. Well worth a listen. se-radio.net/2025/07/se-r...

I'm chatting to Hugo Bowne-Anderson tomorrow about Human Seeded Evals and @logfire.pydantic.dev on Youtube at 4pm UK. I'm pretty confident something like the think I'm describing here is where we'll end up with evals. Please join, I'd love to hear what you think. lu.ma/voeyx7n1

@hannes.muehleisen.org I want this about 3 times a day and I can't be the only one. We discussed it at data council and you seemed keen to implement something. Please can it happen 🙏. github.com/duckdb/duckd...

At @pycon.us today @sa.muelcolvin.com is talking about Pydantic AI and Pydantic Logfire. Room 316, 11.30 today. There will be code. us.pycon.org/2025/schedul...

The recording of last week's meetup with Jason Liu, David Soria Parra (Anthropic), OpenAI and @sa.muelcolvin.com is now live on youtube. Notably this includes David's plan for the future of MCP. youtu.be/GqufkaLJV44

Yo! Spent the weekend over MCP and built something. You can now build MCP servers in your Emmett application 👀 github.com/gi0baro/emme...

Are you building agents, or building with AI more generally? Double win: * Help make @logfire.pydantic.dev better * Get $100 Amazon voucher Sign up for a short interview with the amazing Greg Kogan: docs.google.com/forms/d/e/1F...

THE EVAL HAS LANDED. 🦅 pydantic-evals has been a major piece of work from David Montague over the last month. I'm pretty excited to see it move the dial on how easily Python developers can benchmark and improve AI code.

Pydantic Logfire now supports dedicated EU data residency! If you need your data in the EU for compliance, or just want to keep your data physically within the EU, this new region makes it easy. Announcement blog post: pydantic.dev/articles/eu-...

Pydantic Logfire Enterprise is here! We now offer both self-hosted Logfire and Cloud enterprise @logfire.pydantic.dev. pydantic.dev/articles/log...

Logfire's MCP server could fundamentally change how people complete the software development feedback loop: development -> runtime errors -> bug fix. Unlike other observability platforms, @logfire.pydantic.dev let's the model (or you!) write full SQL to find the relevant data.

Pydantic Logfire MCP Server is here! Easily hook your AI agents into observability data and supercharge debugging in real time. For Cursor integration, just update .cursor/mcp.json to use Logfire and you’re set: www.youtube.com/watch?v=lCda... Full details: pydantic.dev/articles/mcp...

Oh man I was just thinking yesterday how sick it would be to have it in Rust too! Been loving it in python

Best tracing experience in Rust? If you're building in the cloud with Rust, you should really try this.

Our new Logfire Rust SDK is out! It's a drop-in addition to your existing Rust instrumentation. Not all Python SDK features are there yet, let us know what you want us to tackle first: pydantic.dev/articles/rus...

We're hiring, come join the team and work on AI, observability and databases. pydantic.dev/articles/hir...

Pull request to add support for OpenAI's Agent SDK is already up in @logfire.pydantic.dev. github.com/pydantic/log...

Amazing week in the US at AI Engineer and in SF. Interest in @pydantic.dev AI and @logfire.pydantic.dev was phenomenal Turns out developers want to take a bet on Pydantic's track record of developer experience, engineering correctness and open standards, not lock-in and crazy expression languages!

SF @pydantic.dev AI meetup confirmed for 5pm next Tuesday. lu.ma/ado3r4ro - the new NYC event is now full, so if you want to come to the SF meetup, please sign up ASAP.

PydanticAI meetup in New York next week is organised! Thursday 4.30pm near Union Square. If you want to come, please RSVP - lu.ma/w0yo88wb

I at last got around to writing a proper Roadmap for PydanticAI, feedback very welcome, or come and chew my ear off about what features you actually want in person. github.com/pydantic/pyd...

I'm in NYC next week and SF the week after, anyone want to meetup and talk about @pydantic.dev AI and @logfire.pydantic.dev? github.com/pydantic/pyd...

New starter project just landed in @logfire.pydantic.dev Uses pydantic.run to let you send data to logfire without leaving your browser. (and yes, I deleted that write token before posting this 😉)

Do I know anyone from @github.com who can help with something urgent? We moved to github enterprise, which seems to have introduced a $1k billing limit for actions runners which I can't change without support. Right now that means the entire @pydantic.dev team is blocked.

Stable response to my feedback from @sa.muelcolvin.com in github.com/pydantic/pyd..., thank you!

I forgot to mention when introducing pydantic.run: * it's open source and MIT licensed * you can run it yourself with just @cloudflare.social workers * obviously it's based on the amazing work of Pyodide to run Python in the browser github.com/pydantic/pyd...

PydanticAI v0.0.21 released github.com/pydantic/pyd... Includes support for @deepseek.bsky.social

Meet pydantic.run - a python sandbox for writing, sharing and running Python code in the browser. For example, here's sandbox with examples of @logfire.pydantic.dev instrumenting an HTTPX request and a @fastapi.tiangolo.com server using a sqlite database. pydantic.run/store/c81c32...

Yes! @tiangolo.com, @sa.muelcolvin.com, and Astral, have given Python DevX a quantum leap in the last few years. It's incredible what a well designed API and great tooling can do and what they've each contributed is remarkable in terms of joy delivered.

I recently raved about inline-snapshot for writing unit tests, and just (re)discovered dirty-equals by @sa.muelcolvin.com. "Doing dirty (but extremely useful) things with equals." Thank you everyone who makes testing sane. github.com/samuelcolvin...

We've just released @pydantic.dev AI v0.0.19. This comes with the biggest new feature since we announced PydanticAI — graph support! I was originally cynical about graphs, but I'm now really excited about their use cases, both with GenAI and in general purpose development.🧵 ai.pydantic.dev/graph/

Graph support isn't that much code, but conceptually it's the 300lb gorilla of features. Can't wait. github.com/pydantic/pyd...

Testing section of @pydantic.dev 's PydanticAI is pure gold 👌 I love TestModel

youtu.be/xVe87QpNE80 A little introduction on PydanticAI @pydantic.dev. Cheers! #llm #pydanticai #agents #ai #genai