Context Warp Drive: deterministic folding for long-running LLM agents

Jonah T — Mon, 29 Jun 2026 20:50:05 +0000

Context Warp Drive is an open-source TypeScript library for keeping long-running LLM agents under the context ceiling without asking another model to summarize their state.

The core trick is deterministic folding. Instead of summarization calls, it compacts old transcript regions into stable fold artifacts, preserves exact coordinates for recall, and keeps recent/live messages append-only. That gives a harness a smaller prompt while still leaving a trail back to the original material.

Why I built it:

Agents die weirdly when context pressure gets high.
Provider prompt caches reward byte-stable prefixes.
Summaries are useful, but they are not the same thing as deterministic state.

What is in the repo today:

Rolling fold compaction with Coordinate Closet references
Cache-hot freeze for provider prefix caching
Ambient recall/page-in for relevant older material
Durable episodic memory extraction
Register glyphs for continuity signals
Provider helpers for Anthropic caching, with OpenAI/Gemini-shaped adapters in the package
459 deterministic tests in the current tree

Current status:

GitHub: https://github.com/dogtorjonah/context-warp-drive
Hacker News discussion: https://news.ycombinator.com/item?id=48722788
npm package metadata/build/tests are ready for context-warp-drive@0.1.0, but the actual npm publish is waiting on account auth.
JSR needs a jsr.json/Deno config before it is a clean target.

The thing I want feedback on is the shape of the primitive. Is deterministic folding the right lower-level abstraction for long-lived agents, or should this sit higher up as app-specific memory? I am especially interested in people trying to break the cache assumptions, fold invariants, or recall behavior.

I built a browser Mandelbrot explorer for deep zooms

Jonah T — Tue, 09 Jun 2026 03:43:08 +0000

After a 7-week build sprint, I launched Zooming Fractal: https://zoomingfractal.com

It's a free in-browser Mandelbrot set explorer. You can zoom deep into the fractal, tune colors and detail, and save or share exact locations as URLs.

No signup, no install, no paywall. I mostly wanted it to feel like a little visual instrument: open it, wander, find a weird beautiful region, send that exact view to someone.

I'd love feedback from DEV folks on the first-use experience:

Is it obvious what to do in the first 10 seconds?
Does it feel smooth on your browser/device?
Would anything make the share-link flow more useful?

Try it here: https://zoomingfractal.com

DEV Community: Jonah T

Context Warp Drive: deterministic folding for long-running LLM agents

I built a browser Mandelbrot explorer for deep zooms