Den Delimarsky
@den.dev
✍️ Blogger: https://den.dev
🫛 Podcaster: https://theworkitem.com
🤖 Core Maintainer: https://modelcontextprotocol.io
🪴 Product Engineer
🎨 Aspiring Digital Artist
🫛 Podcaster: https://theworkitem.com
🤖 Core Maintainer: https://modelcontextprotocol.io
🪴 Product Engineer
🎨 Aspiring Digital Artist
Nothing like interrupting @davidfowl.com and @maddymontaquila.net right before they do an @aspire.dev livestream.
November 13, 2025 at 4:40 AM
Nothing like interrupting @davidfowl.com and @maddymontaquila.net right before they do an @aspire.dev livestream.
There's very few people that I can instantly recommend as "OMG, if they are hiring - you want to work there."
@seldo.com is, without a doubt, one such person.
You WANT to work on their team.
@seldo.com is, without a doubt, one such person.
You WANT to work on their team.
Okay folks, it's time: I'm hiring!
Looking for 5(!) developer relations engineers across the world! Our company is remote-first but this role involves in-person appearances at events so although you don't need to work in a specific office we are focusing our search in specific metro areas:
Looking for 5(!) developer relations engineers across the world! Our company is remote-first but this role involves in-person appearances at events so although you don't need to work in a specific office we are focusing our search in specific metro areas:
Developer Relations Engineer
San Francisco, CA
job-boards.greenhouse.io
November 10, 2025 at 10:09 PM
There's very few people that I can instantly recommend as "OMG, if they are hiring - you want to work there."
@seldo.com is, without a doubt, one such person.
You WANT to work on their team.
@seldo.com is, without a doubt, one such person.
You WANT to work on their team.
A discussion with one of my research colleagues and @simonwillison.net led me to write this down.
"Full Stack Person" sounds like a mouthful, but IMO captures well the idea of becoming a well-rounded technologist.
den.dev/blog/full-st...
"Full Stack Person" sounds like a mouthful, but IMO captures well the idea of becoming a well-rounded technologist.
den.dev/blog/full-st...
November 7, 2025 at 10:28 PM
A discussion with one of my research colleagues and @simonwillison.net led me to write this down.
"Full Stack Person" sounds like a mouthful, but IMO captures well the idea of becoming a well-rounded technologist.
den.dev/blog/full-st...
"Full Stack Person" sounds like a mouthful, but IMO captures well the idea of becoming a well-rounded technologist.
den.dev/blog/full-st...
Reposted by Den Delimarsky
How do you build quality software with LLMs?
@den.dev talks on .NET Rocks at www.dotnetrocks.com/details/1974 about GitHub Spec Kit, which uses specifications to help LLMs generate better code!
@den.dev talks on .NET Rocks at www.dotnetrocks.com/details/1974 about GitHub Spec Kit, which uses specifications to help LLMs generate better code!
.NET Rocks!
.NET Rocks! is a weekly talk show for anyone interested in programming on the Microsoft .NET platform. The shows range from introductory information to hardcore geekiness.
www.dotnetrocks.com
October 30, 2025 at 3:02 PM
How do you build quality software with LLMs?
@den.dev talks on .NET Rocks at www.dotnetrocks.com/details/1974 about GitHub Spec Kit, which uses specifications to help LLMs generate better code!
@den.dev talks on .NET Rocks at www.dotnetrocks.com/details/1974 about GitHub Spec Kit, which uses specifications to help LLMs generate better code!
Reposted by Den Delimarsky
October 28, 2025 at 9:34 PM
Guess who's back on The Work Item! It's @shirleywu.studio!
Listen to full show
↳ www.youtube.com/watch?v=0O35...
Listen to full show
↳ www.youtube.com/watch?v=0O35...
October 21, 2025 at 1:27 AM
Guess who's back on The Work Item! It's @shirleywu.studio!
Listen to full show
↳ www.youtube.com/watch?v=0O35...
Listen to full show
↳ www.youtube.com/watch?v=0O35...
Client ID Metadata Documents just got accepted into the MCP spec 🥳
Much better DevEx for both client and server developers, and much less painful than Dynamic Client Registration (DCR).
Much better DevEx for both client and server developers, and much less painful than Dynamic Client Registration (DCR).
October 16, 2025 at 7:03 PM
Client ID Metadata Documents just got accepted into the MCP spec 🥳
Much better DevEx for both client and server developers, and much less painful than Dynamic Client Registration (DCR).
Much better DevEx for both client and server developers, and much less painful than Dynamic Client Registration (DCR).
I used Spec Kit to build a Mauna Kea observatory camera tracker 🌠
In the process, had to write a full guide for Spec Kit, because why not 🤷
Read
↳ den.dev/blog/github-...
In the process, had to write a full guide for Spec Kit, because why not 🤷
Read
↳ den.dev/blog/github-...
October 13, 2025 at 6:59 PM
I used Spec Kit to build a Mauna Kea observatory camera tracker 🌠
In the process, had to write a full guide for Spec Kit, because why not 🤷
Read
↳ den.dev/blog/github-...
In the process, had to write a full guide for Spec Kit, because why not 🤷
Read
↳ den.dev/blog/github-...
We just published a whopping many-page-long authorization guide for MCP on the official MCP website.
Weekend reading? 🤩
modelcontextprotocol.io/docs/tutoria...
Weekend reading? 🤩
modelcontextprotocol.io/docs/tutoria...
October 12, 2025 at 7:41 PM
We just published a whopping many-page-long authorization guide for MCP on the official MCP website.
Weekend reading? 🤩
modelcontextprotocol.io/docs/tutoria...
Weekend reading? 🤩
modelcontextprotocol.io/docs/tutoria...
We're working on a fun little experiment that helps bring some structure to LLM-powered software development - it's all about spec-driven development (SDD) ✨
I wrote a post on the @github.com blog that talks about the practices and a (minimalistic) toolchain for this: github.blog/ai-and-ml/ge...
I wrote a post on the @github.com blog that talks about the practices and a (minimalistic) toolchain for this: github.blog/ai-and-ml/ge...
September 4, 2025 at 7:09 PM
We're working on a fun little experiment that helps bring some structure to LLM-powered software development - it's all about spec-driven development (SDD) ✨
I wrote a post on the @github.com blog that talks about the practices and a (minimalistic) toolchain for this: github.blog/ai-and-ml/ge...
I wrote a post on the @github.com blog that talks about the practices and a (minimalistic) toolchain for this: github.blog/ai-and-ml/ge...
New podcast episode drop ✨
This one I looked forward to releasing - it's with none other than @shirleywu.studio!
You might know her from the MULTIPLE hit visualizations that took over your social feeds (including one for Hamilton), and so much more.
Full show 👉 theworkitem.com/episodes/dat...
This one I looked forward to releasing - it's with none other than @shirleywu.studio!
You might know her from the MULTIPLE hit visualizations that took over your social feeds (including one for Hamilton), and so much more.
Full show 👉 theworkitem.com/episodes/dat...
August 14, 2025 at 4:59 PM
New podcast episode drop ✨
This one I looked forward to releasing - it's with none other than @shirleywu.studio!
You might know her from the MULTIPLE hit visualizations that took over your social feeds (including one for Hamilton), and so much more.
Full show 👉 theworkitem.com/episodes/dat...
This one I looked forward to releasing - it's with none other than @shirleywu.studio!
You might know her from the MULTIPLE hit visualizations that took over your social feeds (including one for Hamilton), and so much more.
Full show 👉 theworkitem.com/episodes/dat...
Check this out! Just last week, I talked at MCP Developer Days with some awesome folks from Arcade.dev about MCP server security and how to protect them when it's not just humans working with them ✨
🔐 Building secure AI agents? In this MCP Dev Days session replay, we deep dive on advanced MCP server security—OAuth 2.1, token validation, and defending against confused deputy attacks. #AIsecurity
🎥 msft.it/63322sKX9M
🎥 msft.it/63322sKX9M
August 8, 2025 at 9:38 PM
Check this out! Just last week, I talked at MCP Developer Days with some awesome folks from Arcade.dev about MCP server security and how to protect them when it's not just humans working with them ✨
Reposted by Den Delimarsky
It's Friday, delegate your work to coding agent and start your weekend early
August 8, 2025 at 4:46 PM
It's Friday, delegate your work to coding agent and start your weekend early
A new REALLY COOL role in our division at Microsoft - Principal Technical Program Manager!
🥹 Collab with me (benefit or drawback, depending on how you look at it)
✨ Work on cutting-edge AI dev tools
👻 Craft ways to synthesize feedback
🧙♀️ Role: jobs.careers.microsoft.com/global/en/jo...
🥹 Collab with me (benefit or drawback, depending on how you look at it)
✨ Work on cutting-edge AI dev tools
👻 Craft ways to synthesize feedback
🧙♀️ Role: jobs.careers.microsoft.com/global/en/jo...
August 8, 2025 at 1:52 AM
A new REALLY COOL role in our division at Microsoft - Principal Technical Program Manager!
🥹 Collab with me (benefit or drawback, depending on how you look at it)
✨ Work on cutting-edge AI dev tools
👻 Craft ways to synthesize feedback
🧙♀️ Role: jobs.careers.microsoft.com/global/en/jo...
🥹 Collab with me (benefit or drawback, depending on how you look at it)
✨ Work on cutting-edge AI dev tools
👻 Craft ways to synthesize feedback
🧙♀️ Role: jobs.careers.microsoft.com/global/en/jo...
Reposted by Den Delimarsky
We heard you like Opus..
August 5, 2025 at 7:48 PM
We heard you like Opus..
You know what makes me happy about this list? Auth 😊
One of the big questions that comes up when folks want to adopt MCP is "How do I allow my users to auth against protected resources?"
One of the big questions that comes up when folks want to adopt MCP is "How do I allow my users to auth against protected resources?"
Results are in!
🧩Prompts > 🔐MCP OAuth > 📚Resources > 🧠Sampling
- Prompts: modelcontextprotocol.io/docs/concept...
- MCP OAuth: modelcontextprotocol.io/specificatio...
- Resources: modelcontextprotocol.io/docs/concept...
- Sampling: modelcontextprotocol.io/docs/concept...
Time to cook!
🧩Prompts > 🔐MCP OAuth > 📚Resources > 🧠Sampling
- Prompts: modelcontextprotocol.io/docs/concept...
- MCP OAuth: modelcontextprotocol.io/specificatio...
- Resources: modelcontextprotocol.io/docs/concept...
- Sampling: modelcontextprotocol.io/docs/concept...
Time to cook!
July 31, 2025 at 11:00 PM
You know what makes me happy about this list? Auth 😊
One of the big questions that comes up when folks want to adopt MCP is "How do I allow my users to auth against protected resources?"
One of the big questions that comes up when folks want to adopt MCP is "How do I allow my users to auth against protected resources?"
New podcast episode with @lennpryor.bsky.social just dropped ✨
Biggest takeaway - we're all thinking wrong about our careers.
Check full episode out 👉 theworkitem.com/episodes/bui...
Biggest takeaway - we're all thinking wrong about our careers.
Check full episode out 👉 theworkitem.com/episodes/bui...
July 29, 2025 at 6:27 AM
New podcast episode with @lennpryor.bsky.social just dropped ✨
Biggest takeaway - we're all thinking wrong about our careers.
Check full episode out 👉 theworkitem.com/episodes/bui...
Biggest takeaway - we're all thinking wrong about our careers.
Check full episode out 👉 theworkitem.com/episodes/bui...
Reposted by Den Delimarsky
Can You Build Agent2Agent Communication on MCP?
Yes.
I wrote an article about how you can compose some of the recent features within MCP( resumable streams, elicitation, sampling, and notifications ) to implement long running agents (as tools):
devblogs.microsoft.com/blog/can-you...
Yes.
I wrote an article about how you can compose some of the recent features within MCP( resumable streams, elicitation, sampling, and notifications ) to implement long running agents (as tools):
devblogs.microsoft.com/blog/can-you...
July 24, 2025 at 10:25 PM
Can You Build Agent2Agent Communication on MCP?
Yes.
I wrote an article about how you can compose some of the recent features within MCP( resumable streams, elicitation, sampling, and notifications ) to implement long running agents (as tools):
devblogs.microsoft.com/blog/can-you...
Yes.
I wrote an article about how you can compose some of the recent features within MCP( resumable streams, elicitation, sampling, and notifications ) to implement long running agents (as tools):
devblogs.microsoft.com/blog/can-you...
Reposted by Den Delimarsky
🚨 Live in 30 minutes! Hosted by Anthropic, catch the webinar with Burke Holland and Harald Kirschner from the VS Code team: "Building the future of AI coding with MCP in VS Code and Claude"
Register here: www.anthropic.com/webinars/fut...
Register here: www.anthropic.com/webinars/fut...
July 24, 2025 at 4:31 PM
🚨 Live in 30 minutes! Hosted by Anthropic, catch the webinar with Burke Holland and Harald Kirschner from the VS Code team: "Building the future of AI coding with MCP in VS Code and Claude"
Register here: www.anthropic.com/webinars/fut...
Register here: www.anthropic.com/webinars/fut...
Reposted by Den Delimarsky
Hey folks, if you are working with Model Context Protocol in C#, you should check out the features in our latest SDK release. I wrote about them in the .NET Blog. Check it out!
devblogs.microsoft.com/dotnet/mcp-c...
#dotnet
devblogs.microsoft.com/dotnet/mcp-c...
#dotnet
MCP C# SDK Gets Major Update: Support for Protocol Version 2025-06-18 - .NET Blog
The MCP C# SDK has been updated to support the latest Model Context Protocol specification (2025-06-18), bringing structured tool output, elicitation support, enhanced security, and more to .NET devel...
devblogs.microsoft.com
July 23, 2025 at 2:42 AM
Hey folks, if you are working with Model Context Protocol in C#, you should check out the features in our latest SDK release. I wrote about them in the .NET Blog. Check it out!
devblogs.microsoft.com/dotnet/mcp-c...
#dotnet
devblogs.microsoft.com/dotnet/mcp-c...
#dotnet
Reposted by Den Delimarsky
MCP Dev Days is only a week away! Don't miss this two-day virtual event dedicated to MCP. You'll hear from the community, see live demos, dive deep into implementation, and so much more.
Register now: aka.ms/MCPDevDays
Register now: aka.ms/MCPDevDays
July 22, 2025 at 6:18 PM
MCP Dev Days is only a week away! Don't miss this two-day virtual event dedicated to MCP. You'll hear from the community, see live demos, dive deep into implementation, and so much more.
Register now: aka.ms/MCPDevDays
Register now: aka.ms/MCPDevDays
Check this magic out ✨
If you are using @vscode.dev Insiders, you get to plug in remote MCP servers that do not support Dynamic Client Registration (DCR) and still be able to work with them - you'll just need to enter client details 😁
One of the ways we're making the dev experience butter-smooth!
If you are using @vscode.dev Insiders, you get to plug in remote MCP servers that do not support Dynamic Client Registration (DCR) and still be able to work with them - you'll just need to enter client details 😁
One of the ways we're making the dev experience butter-smooth!
July 21, 2025 at 12:36 AM
Check this magic out ✨
If you are using @vscode.dev Insiders, you get to plug in remote MCP servers that do not support Dynamic Client Registration (DCR) and still be able to work with them - you'll just need to enter client details 😁
One of the ways we're making the dev experience butter-smooth!
If you are using @vscode.dev Insiders, you get to plug in remote MCP servers that do not support Dynamic Client Registration (DCR) and still be able to work with them - you'll just need to enter client details 😁
One of the ways we're making the dev experience butter-smooth!
July 15, 2025 at 1:36 AM
The year of Linux on the desktop.
July 12, 2025 at 5:42 PM
The year of Linux on the desktop.