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Samuel Colvin

@sa.muelcolvin.com
1.8K followers 114 following 70 posts

Building Pydantic Logfire - uncomplicated observability for Python. Sequoia Scout.

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Reposted by Samuel Colvin
Sebastián Ramírez @tiangolo.com · 20/08/2026
Did you see the famous talk "Pydantic is all you need"? And how that ended up in AI Labs providing structured output? It seems Jason Liu is all you need! 🙌 (And we'll all keep making references to the Transformers paper until morale improves).
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 12/08/2026
Hack Monty Round 3 is live: $20,000 to escape our Rust-based Python sandbox and read a secret off the server running it. Now behind a production WebSocket service, so Round 2's tricks won't carry over. Nobody escaped last round. Probably the last one before Monty V1. pydantic.dev/articles/hac...
pydantic.dev
Hack Monty Round 3: a $20,000 Python sandbox bounty
No one escaped the Monty sandbox in Round 2. Round 3 is live with a $20,000 bounty on the new Monty WebSocket service. Here's what changed and how to play.
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Reposted by Samuel Colvin
FastAPI @fastapi.tiangolo.com · 04/08/2026
New FastAPI Conf speaker! 📢 @sa.muelcolvin.com , creator and founder of @pydantic.dev ✨ FastAPI is built on top of Pydantic and the two ecosystems are a perfect match. Of course we had to have him! 🤝 Early bird ending soon, got your tickets? fastapiconf.com
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Fabrizio Damicelli @fabridamicelli.bsky.social · 28/05/2026
📢 TIL 📑 The python `watchfiles` library by @sa.muelcolvin.com is a handy alternative to hook into filesystem notifications. I recently used it to implement a file syncer and it worked great! fabridamicelli.com/til/watchfil...
fabridamicelli.com
watchfiles: A handy Python library to watch for file changes – Fabrizio Damicelli
A pythonic alternative to register and react to filesystem notifications
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Samuel Colvin @sa.muelcolvin.com · 13/05/2026
🎉🎉 Pydantic happy hour at @pycon.us on Friday at 6pm. 🎉🎉 Signup ASAP as places are limited luma.com/kbk9wj7g
luma.com
Pydantic Happy Hour at PyCon US · Luma
PyCon is a lot. Come decompress with us. Samuel Colvin and the Pydantic Team are hosting a happy hour and it's exactly what it sounds like: drinks, a chill…
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Reposted by Samuel Colvin
SurrealDB @surrealdb.com · 23/03/2026
Thanks to @sa.muelcolvin.com (@pydantic.dev) and @badmonster0.bsky.social (@cocoindex.bsky.social) for their sessions, and to @awscloud.bsky.social Builder Loft for hosting us.
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 27/02/2026
A few weeks ago our founder announced Monty, a minimal, secure Python interpreter written in Rust, for running code written by AI agents. People got excited. @sa.muelcolvin.com just wrote up the full story on why he's excited about it and you should be too. pydantic.dev/articles/pyd...
pydantic.dev
Pydantic Monty: A Minimal Python Sandbox for AI Agents | Pydantic
Meet Monty — a secure, minimal Python interpreter written in Rust for running AI-generated code. Learn where it sits between tool calling and full computer use, and why CodeMode matters for AI agents.
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Sung Kim @sungkim.bsky.social · 06/02/2026
Pydantic's Monty A minimal, secure Python interpreter written in Rust for use by AI. github.com/pydantic/monty
github.com
GitHub - pydantic/monty: A minimal, secure Python interpreter written in Rust for use by AI
A minimal, secure Python interpreter written in Rust for use by AI - pydantic/monty
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filtra.io @filtra.bsky.social · 06/02/2026
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:
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filtra.io @filtra.bsky.social · 06/02/2026
Podcast with Pydantic: filtra.io/rust/intervi...
filtra.io
filtra.io | Pydantic: The Python Darling That Loves Rust
A filtra.io interview featuring Pydantic.
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Reposted by Samuel Colvin
SurrealDB @surrealdb.com · 19/12/2025
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.👇
youtube.com
Stream #35: Production-grade AI agents with SurrealDB & Pydantic AI
YouTube video by SurrealDB
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Reposted by Samuel Colvin
SurrealDB @surrealdb.com · 17/12/2025
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.
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Reposted by Samuel Colvin
Software Engineering Daily @softwaredaily.bsky.social · 04/12/2025
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
softwareengineeringdaily.com
Pydantic AI with Samuel Colvin - Software Engineering Daily
Python’s popularity in data science and backend engineering has made it the default language for building AI infrastructure. However, with the rapid growth of AI applications, developers are increasin...
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Samuel Colvin @sa.muelcolvin.com · 10/11/2025
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.
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Reposted by Samuel Colvin
Qian Li @qianli.dev · 28/10/2025
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.
A screenshot of using Logfire + DBOS + Pydantic AI agent.
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Reposted by Samuel Colvin
Adam Azzam @aaazzam.bsky.social · 23/10/2025
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
luma.com
Py AI Meetup · Luma
Join us for an evening of cutting-edge AI discussions featuring lightning talks from leading practitioners: Samuel Colvin (CEO of Pydantic) Reducto + Modal…
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Samuel Colvin @sa.muelcolvin.com · 15/10/2025
Just putting this here. Not much more to say. @pydantic.dev
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Reposted by Samuel Colvin
Qian Li @qianli.dev · 25/09/2025
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).
uv tree for dbos v2.0.0
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Reposted by Samuel Colvin
David Brochart @davidbrochart.bsky.social · 17/09/2025
You made my day @pydantic.dev 😁 pydantic.dev/articles/pyd...
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Reposted by Samuel Colvin
Heroku @heroku.com · 09/09/2025
ICYMI, #Heroku support for @pydantic.dev is here. To get started, all you have to do is provision Managed Inference and Agents from Heroku Elements or via the command line. 🔗 sforce.co/3Ii73mR
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 23/07/2025
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...
ai.pydantic.dev
AG-UI - Pydantic AI
Agent Framework / shim to use Pydantic with LLMs
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 11/07/2025
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...
se-radio.net
SE Radio 676: Samuel Colvin on the Pydantic Ecosystem – Software Engineering Radio
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Samuel Colvin @sa.muelcolvin.com · 01/07/2025
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
lu.ma
Human-seeded Evals: Scaling Judgement with LLMs (with Samuel Colvin) · Luma
Everyone agrees evals are essential—but almost no one implements them rigorously. Why? They're hard to write, time-consuming, and brittle. Samuel Colvin,…
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Samuel Colvin @sa.muelcolvin.com · 28/06/2025
@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...
github.com
Feature Request: `mode` parquet, or access to the preview query as a view via `_` · duckdb duckdb · Discussion #17122
I'd really like a way to output a query to a parquet file (in order to plot the results). I think the simplest way to do this would be to support .mode parquet This wouldn't affect the mode of prin...
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 15/05/2025
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...
us.pycon.org
Building AI Applications the Pydantic Way (Sponsor: Pydantic) - PyCon US 2025
PyCon US 2025
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 15/04/2025
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
youtu.be
Pydantic, Jason Liu & MCP Meetup - April 8, 2025
YouTube video by Pydantic
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Reposted by Samuel Colvin
Giovanni Barillari @baro.dev · 13/04/2025
Yo! Spent the weekend over MCP and built something. You can now build MCP servers in your Emmett application 👀 github.com/gi0baro/emme...
github.com
GitHub - gi0baro/emmett-mcp: MCP extension for Emmett framework
MCP extension for Emmett framework. Contribute to gi0baro/emmett-mcp development by creating an account on GitHub.
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Samuel Colvin @sa.muelcolvin.com · 02/04/2025
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...
docs.google.com
Python devs building AI (agents): Can we chat about your experience?
My name is Greg Kogan and I'm conducting user research with experienced Python developers who build AI applications, particularly agent-based systems. If selected, we'll do a 45-minute Zoom interview ...
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Samuel Colvin @sa.muelcolvin.com · 31/03/2025
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.
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 26/03/2025
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.dev
Pydantic Logfire EU Data Region Announcement | Pydantic
Logfire now offers data residency in the EU region
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 21/03/2025
Pydantic Logfire Enterprise is here! We now offer both self-hosted Logfire and Cloud enterprise @logfire.pydantic.dev. pydantic.dev/articles/log...
pydantic.dev
Pydantic Logfire Enterprise | Pydantic
Logfire Self Hosting Is Available
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Samuel Colvin @sa.muelcolvin.com · 20/03/2025
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.
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 20/03/2025
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...
youtube.com
Pydantic Logfire MCP Server with Cursor Demo
YouTube video by Pydantic
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Reposted by Samuel Colvin
Tolki @tolki.dev · 19/03/2025
Oh man I was just thinking yesterday how sick it would be to have it in Rust too! Been loving it in python
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Samuel Colvin @sa.muelcolvin.com · 19/03/2025
Best tracing experience in Rust? If you're building in the cloud with Rust, you should really try this.
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Pydantic @pydantic.dev · 19/03/2025
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...
pydantic.dev
Pydantic Logfire Rust SDK Announcement | Pydantic
Our Logfire Rust SDK Is Now Available
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Reposted by Samuel Colvin
Pydantic @pydantic.dev · 17/03/2025
We're hiring, come join the team and work on AI, observability and databases. pydantic.dev/articles/hir...
pydantic.dev
Pydantic is Hiring Again | Pydantic
The Pydantic team has new open roles
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Samuel Colvin @sa.muelcolvin.com · 11/03/2025
Pull request to add support for OpenAI's Agent SDK is already up in @logfire.pydantic.dev. github.com/pydantic/log...
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Samuel Colvin @sa.muelcolvin.com · 26/02/2025
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!
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Samuel Colvin @sa.muelcolvin.com · 17/02/2025
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.
lu.ma
Pydantic in SF · Luma
Let's talk about PydanticAI, and Pydantic Logfire. See pydantic/pydantic-ai#905 for more info.
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Samuel Colvin @sa.muelcolvin.com · 14/02/2025
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
lu.ma
Pydantic in NYC · Luma
Let's talk about PydanticAI, and Pydantic Logfire. See pydantic/pydantic-ai#905 for more info.
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Samuel Colvin @sa.muelcolvin.com · 12/02/2025
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...
github.com
PydanticAI Roadmap · Issue #913 · pydantic/pydantic-ai
People having been asking for a while for a roadmap for PydanticAI, here goes. For the most part, I'll drink the GitHub cool ade and add the issues that represent our ordered priorities using the n...
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Samuel Colvin @sa.muelcolvin.com · 12/02/2025
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...
github.com
Meetup in NYC and SF? · Issue #905 · pydantic/pydantic-ai
I'm going to be in New York next week (18th to 23rd) to give a workshop at AI Engineer on the 22nd. And then in the bay area the following week — 24th to 26th. Is anyone interested in meeting up in...
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Samuel Colvin @sa.muelcolvin.com · 07/02/2025
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 😉)
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Samuel Colvin @sa.muelcolvin.com · 06/02/2025
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.
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Jannis Leidel @jezdez.dev · 31/01/2025
Stable response to my feedback from @sa.muelcolvin.com in github.com/pydantic/pyd..., thank you!
github.com
add Pyodide links by samuelcolvin · Pull Request #35 · pydantic/pydantic.run
@jezdez is this satisfactory as per your comment here? I'll also set up sponsorship for pyodide from our github org.
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Samuel Colvin @sa.muelcolvin.com · 31/01/2025
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...
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Pydantic @pydantic.dev · 30/01/2025
PydanticAI v0.0.21 released github.com/pydantic/pyd... Includes support for @deepseek.bsky.social
github.com
Release v0.0.21 2025-01-30 · pydantic/pydantic-ai
What's Changed Update index.md by @kauabh in #759 Add codespell support (config, workflow to detect/not fix) and make it fix few typos by @yarikoptic in #757 Ensure custom args are used when retri...
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Samuel Colvin @sa.muelcolvin.com · 29/01/2025
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...
pydantic.run
pydantic.run
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