What even is code mode?
Code mode lets an agent write code that calls its tools, instead of calling them one at a time. It was introduced for MCP, but it works for any agent. How Polylane's agent uses it, and what the data says.
Blog
How to build a memory system for proactive agents
Proactive agents run without a prompt, so each run has to start from what earlier runs learned. How we built memory for Polylane's agents on git: one repository per team, a nightly clean-up, and lessons from merged pull requests.
Nobody reads pull request descriptions, so we made videos
Almost none of the pull requests Polylane opens were asked for by an engineer, and a longer description does not make them easier to review. We are experimenting with a narrated video for every fix. Why, what it looks like, and what happened to merge rates.
Turn your app into a context graph
Agents that run software need a context graph of the app: every resource, what it connects to, the repository that deploys it and the team that owns it. How we built one on Durable Objects, keep it fresh across every provider without polling AWS, decide what counts as a change, and delete from it safely.
We swapped our LLMs for Jev. It's 39% cheaper.
Our agent makes thousands of small decisions a day. We moved them from LLMs to Jev, a model that doesn't write text, and cut the cost by 39%.
How we prevent slop from hitting prod
Nothing in your pipeline asks whether a change is safe for prod. This is the check we built that does, and how we got it to finish before your tests do.
Sub-agents are just wrong
Polylane's autofix used to be a workflow of multiple agents, each responsible for a single task, with an orchestrator managing state between them. We moved to a single agent which does the entire job, from evidence gathering, hypothesis testing to pull request.
How We Fixed Our Cloudflare Durable Objects Memory Exceeded Errors
Cloudflare Durable Objects run in V8 isolates with a hard 128 MB limit. Ours idled at ~140 MB and was reset ~300 times a day. 130 MB of zod schemas were built at module load, most of them by code that was never called. How we profiled the production bundle, the two fixes, and the numbers, 218 MB to 82 MB and resets to zero.
I'm Betting My Company on Proactive Agents
Agents can do almost anything you ask. That's the problem, you still have to ask. The next evolution is agents that figure out the job to be done. I started with operations, because nobody should be on-call in 2026.
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