Samuel Colvin
@sa.muelcolvin.com
Building Pydantic Logfire - uncomplicated observability for Python. Sequoia Scout.
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.
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.
November 10, 2025 at 2:38 AM
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.
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.
Reposted by Samuel Colvin
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.
October 28, 2025 at 5:34 PM
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.
Reposted by Samuel Colvin
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
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
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…
luma.com
October 23, 2025 at 7:25 PM
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
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
October 15, 2025 at 8:17 PM
Reposted by Samuel Colvin
October 15, 2025 at 4:07 PM
Reposted by Samuel Colvin
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).
It's lightweight (for real).
September 25, 2025 at 4:28 PM
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).
It's lightweight (for real).
Reposted by Samuel Colvin
September 17, 2025 at 12:09 PM
Reposted by Samuel Colvin
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.
🔗 https://sforce.co/3Ii73mR
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
September 9, 2025 at 7:56 PM
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.
🔗 https://sforce.co/3Ii73mR
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
Reposted by Samuel Colvin
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/#agent...
AG-UI - Pydantic AI
Agent Framework / shim to use Pydantic with LLMs
ai.pydantic.dev
July 23, 2025 at 5:55 PM
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/#agent...
Reposted by Samuel Colvin
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...
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 676: Samuel Colvin on the Pydantic Ecosystem – Software Engineering Radio
se-radio.net
July 11, 2025 at 3:54 PM
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...
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
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
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,…
lu.ma
July 1, 2025 at 8:22 PM
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
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...
We discussed it at data council and you seemed keen to implement something. Please can it happen 🙏.
github.com/duckdb/duckd...
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...
github.com
June 28, 2025 at 3:20 PM
@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...
We discussed it at data council and you seemed keen to implement something. Please can it happen 🙏.
github.com/duckdb/duckd...
Reposted by Samuel Colvin
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...
Room 316, 11.30 today.
There will be code.
us.pycon.org/2025/schedul...
Building AI Applications the Pydantic Way (Sponsor: Pydantic)
- PyCon US 2025
PyCon US 2025
us.pycon.org
May 15, 2025 at 10:41 AM
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...
Room 316, 11.30 today.
There will be code.
us.pycon.org/2025/schedul...
Reposted by Samuel Colvin
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
Notably this includes David's plan for the future of MCP.
youtu.be/GqufkaLJV44
Pydantic, Jason Liu & MCP Meetup - April 8, 2025
YouTube video by Pydantic
youtu.be
April 15, 2025 at 11:45 AM
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
Notably this includes David's plan for the future of MCP.
youtu.be/GqufkaLJV44
Reposted by Samuel Colvin
Yo! Spent the weekend over MCP and built something.
You can now build MCP servers in your Emmett application 👀
github.com/gi0baro/emme...
You can now build MCP servers in your Emmett application 👀
github.com/gi0baro/emme...
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.
github.com
April 13, 2025 at 3:33 PM
Yo! Spent the weekend over MCP and built something.
You can now build MCP servers in your Emmett application 👀
github.com/gi0baro/emme...
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...
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...
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 ...
docs.google.com
April 2, 2025 at 2:37 PM
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...
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-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 Evals is a powerful evaluation framework designed to help you systematically test and evaluate the performance and accuracy of the systems you build, especially when working with LLMs.
More info here: ai.pydantic.dev/evals/
More info here: ai.pydantic.dev/evals/
Evals - PydanticAI
Agent Framework / shim to use Pydantic with LLMs
ai.pydantic.dev
March 31, 2025 at 10:51 PM
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-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.
Reposted by Samuel Colvin
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-...
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 EU Data Region Announcement | Pydantic
Logfire now offers data residency in the EU region
pydantic.dev
March 26, 2025 at 5:57 PM
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-...
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-...
Reposted by Samuel Colvin
Pydantic Logfire Enterprise is here!
We now offer both self-hosted Logfire and Cloud enterprise @logfire.pydantic.dev.
pydantic.dev/articles/log...
We now offer both self-hosted Logfire and Cloud enterprise @logfire.pydantic.dev.
pydantic.dev/articles/log...
Pydantic Logfire Enterprise | Pydantic
Logfire Self Hosting Is Available
pydantic.dev
March 21, 2025 at 6:24 PM
Pydantic Logfire Enterprise is here!
We now offer both self-hosted Logfire and Cloud enterprise @logfire.pydantic.dev.
pydantic.dev/articles/log...
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.
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...
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...
Pydantic Logfire MCP Server with Cursor Demo
YouTube video by Pydantic
www.youtube.com
March 20, 2025 at 7:42 PM
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.
Unlike other observability platforms, @logfire.pydantic.dev let's the model (or you!) write full SQL to find the relevant data.
Reposted by Samuel Colvin
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...
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...
Pydantic Logfire MCP Server with Cursor Demo
YouTube video by Pydantic
www.youtube.com
March 20, 2025 at 7:14 PM
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...
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...
Reposted by Samuel Colvin
Oh man I was just thinking yesterday how sick it would be to have it in Rust too!
Been loving it in python
Been loving it in python
March 19, 2025 at 10:44 PM
Oh man I was just thinking yesterday how sick it would be to have it in Rust too!
Been loving it in python
Been loving it in python
Best tracing experience in Rust?
If you're building in the cloud with Rust, you should really try this.
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...
Pydantic Logfire Rust SDK Announcement | Pydantic
Our Logfire Rust SDK Is Now Available
pydantic.dev
March 19, 2025 at 10:13 PM
Best tracing experience in Rust?
If you're building in the cloud with Rust, you should really try this.
If you're building in the cloud with Rust, you should really try this.
Reposted by Samuel Colvin
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 Logfire Rust SDK Announcement | Pydantic
Our Logfire Rust SDK Is Now Available
pydantic.dev
March 19, 2025 at 6:50 PM
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...
Reposted by Samuel Colvin
We're hiring, come join the team and work on AI, observability and databases.
pydantic.dev/articles/hir...
pydantic.dev/articles/hir...
Pydantic is Hiring Again | Pydantic
The Pydantic team has new open roles
pydantic.dev
March 17, 2025 at 10:08 PM
We're hiring, come join the team and work on AI, observability and databases.
pydantic.dev/articles/hir...
pydantic.dev/articles/hir...