Edd Mann

developer, building things - 🎙️

[Edd Mann @edd_mann]

over the last month or so i’ve been digging into how coding agent harnesses actually work.

looking at tools like claude code, codex, opencode, and especially pi from @badlogicgames, it’s been interesting to peel back the layers and see the patterns underneath them 👀

i learnt a lot in particular from looking at how pi has been architected.

as a result, i ended up building my own coding agent harness in python and documenting the rings that build around a minimal agent loop to create the kinds of systems we’re starting to see more of:

- providers
- tools + permissions
- sessions + state
- context strategy + compaction
- prompts + skills
- plugins + extensions
- delivery

the post walks through those layers piece by piece, along with the accompanying code and diagrams.

if you’re curious about how these systems are structured under the hood, hopefully this is useful.

post: https://t.co/IXioaCtd7b
code: https://t.co/7m5By427gL

[Edd Mann @edd_mann]

@ashleyhindle its the only viable way i can think of! 😎

[Siddhartha Saxena @siddsax]

Anthropic onboarding day: Michael Scott introducing Karpathy like he just signed Wemby in free agency.

[Edd Mann @edd_mann]

have really enjoyed using this tool recently! initial analysis and breakdown of semantic features within a system to then go on and review in parallel is very useful. thanks @steipete

[Peter Steinberger 🦞 @steipete]

Try https://t.co/8xIcXuojse on one of your repos and let codex work its magic. It's amazing at uncovering bugs you didn't know you had.

[Dilyan @DilyanDimitrov]

I setup MCP server for Garmin so I asked Claude to analyze my bike training and give me recommendations

It did and suggested 5 workouts I can start doing

It then created them in my account

Super cool

Thanks for the MCP @edd_mann 👏

[Edd Mann @edd_mann]

@DilyanDimitrov that's awesome! really glad to see you're finding it useful 🙏

[Ryan Dahl @rough__sea]

we've been increasingly using agents for production operations on Deno Deploy

Open sourcing what we built to sleep easier while these things run 24/7

I wrote about our motivation here https://t.co/hzBAZFdhZK

[Edd Mann @edd_mann]

@ashleyhindle oh man, i've had that happen to me just now too! back to gpt 5.5 i go...

[Edd Mann @edd_mann]

been spending some time going through PRs across my OSS projects recently.

just released garmin connect mcp server v1.0.1 🎉

it’s now published on PyPI, so you can run it directly with:

uvx garmin-connect-mcp

repo: https://t.co/tBKcHftSuw

#opensource #mcp #claudeai #garmin #python

[Cloudflare @Cloudflare]

Cloudflare's security team spent the last few weeks testing Anthropic's Mythos against fifty of our own repositories. What we learned about offensive AI, why faster patching is the wrong reaction, and what the architecture around vulnerabilities has to look like next. https://t.co/RSrRtIhgaV

[Edd Mann @edd_mann]

@MrSimonBennett looking forward to seeing the results!

[Edd Mann @edd_mann]

@ashleyhindle that is pure magic! 🪄😎

[Edd Mann @edd_mann]

love the new pi website design! @badlogicgames @mitsuhiko 🖌️🎨

[Edd Mann @edd_mann]

my new favourite thing recently has been exploring codebases through mermaid diagrams.

being able to generate up-to-date architectural overviews - then zoom into the specific parts of the system i care about at that moment - has been incredibly useful 👌

[Edd Mann @edd_mann]

@ashleyhindle this along with the html agent output movement makes it so much easier to digest stuff!

[Edd Mann @edd_mann]

@lucasmeijer oh man i know the feeling, that's a great lib!

[Edd Mann @edd_mann]

it's too easy to get distracted, i've been using @jsonresume as the source for multiple themes of my cv, letting the frontend design skill run wild! haha

[Edd Mann @edd_mann]

til about `await using` in ts for auto. async cleanup thanks to @mattpocockuk’s sandcastle project 🙏 https://t.co/zNtNOHORrF

[Mario Zechner @badlogicgames]

for your enjoyment:

https://t.co/agn3BP6PJy

GPT-2's architecture is really really simple to understand mechanically. Modern arch's are obviously more complex, but the basic principles are largely the same still. study it!

https://t.co/j7mCk3PaQ7

[kache @yacineMTB]

you can outsource your thinking
but you cannot outsource your understanding