@SolutionB2u Tried it! I think I get the flash now. On press the indicator goes frosted, so the icon under it dims for a moment. Once it settles back to white, the icon pops back too. That dim then pop is what reads like a blink. Still love the feel tho
Another insane Jev use case!
Decision models like Jev are making it dramatically cheaper to evaluate what actually happens inside an agent run.
And now there’s an open-source memory layer that puts those evaluations to work, making useful lessons reusable across 20+ agent harnesses:
- Claude Code
- Codex
- Cursor
- OpenCode
- and more.
The project is Beacon, from @asymptotelabs.
GitHub: https://t.co/KNgtyAGf3b
(don't forget to star 🌟)
Here’s what I did in the video below.
1) I gave Claude Code a coding task. It made changes and ran tests while Beacon automatically recorded the session.
2) I had Jev evaluate the run. The first evaluation returned review because I hadn’t provided a correction, so my app saved nothing.
3) I corrected the agent, and it updated its work and reran the tests. Jev evaluated the updated session, and this time the results met my app’s rules for saving a memory.
4) I saved the correction and its supporting evidence as shared memory. Then I opened a separate Codex session and explicitly asked it to read that memory.
Codex recalled the correction from the earlier Claude Code session without me having to explain it again.
Beacon captured the session history. Jev evaluated what was worth keeping, while my app applied the storage rules and saved the lesson.
That correction was now available as context outside the conversation where I first made it.
I cover this build in more detail in the video with Justin, co-founder of Asymptote Labs, alongside moving sessions between agents, creating reusable skills, and detecting security risks across agent activity.
Watch the full video below.
335 lines down to 10 in the demo is the hook. The part that matters is question two: is it already in the repo?
That only pays off if there's something to find. Agents tend to reuse what exists and hardcode what doesn't🤖
The new Ponytail 5 is a complete rewrite. Same request, "add a date picker to the frontend": without it, the agent wrote 335 lines. With it, 𝗷𝘂𝘀𝘁 𝟭𝟬 𝗹𝗶𝗻𝗲𝘀, using the repo's existing Input component and letting the browser supply the calendar.
In the maker's own benchmark, 39 tasks in Claude Code with Opus 5.5, the agent with Ponytail wrote 53% less code, took 41% less time and cost 26% less. It wrote less, yet 𝟵𝟴% 𝗼𝗳 𝗶𝘁𝘀 𝗿𝗶𝘀𝗸𝘆 𝗹𝗼𝗴𝗶𝗰 𝘀𝗵𝗶𝗽𝗽𝗲𝗱 𝘄𝗶𝘁𝗵 𝗮 𝘁𝗲𝘀𝘁, against 68% without.
Before writing code, it reads the parts the change touches, then asks these in order and stops at the first one that holds:
→ Does this have to be written at all?
→ Is it already in the repo?
→ Is the standard library enough?
→ Does the browser or the OS already have it?
→ Can an installed dependency cover it?
→ Can it be one line?
→ If none of that works, write the smallest version that runs, plus one small test if it has logic
Input validation, error handling, security and accessibility never get cut.
Two commands were rebuilt too. /ponytail-review used to look only for code to delete; now it also reads the code your change touches. Rename a field and break a file you never touched, and it catches that. In the maker's tests it found every problem outside the diff, against 78% without the skill. /ponytail-audit runs the same checks across the whole repo and ranks what to fix first.
5.3 also adds a bar above the Claude Code prompt: what the task cost, its tokens, how long it ran, how much existing code it reused, and whether the tests passed (needs Claude Code 2.1.290 or later).
MIT licensed, 172K stars, 8,000+ more this week. To make your agent look for what already exists before it writes, paste these into Claude Code as two separate prompts:
/plugin marketplace add DietrichGebert/ponytail
/plugin install ponytail@ponytail
In Codex, run these two:
codex plugin marketplace add DietrichGebert/ponytail
codex plugin add ponytail@ponytail
Then trust its two hooks in /hooks and start a new thread.