Agents got cheaper. Someone wants to break them.

Two things kept showing up in agent news this week: people trying to make agents cheaper to run, and people trying to figure out how to stop them from doing something nobody asked for.

On the cheaper side, Exa's web-research API orchestrates smaller, cheaper models for the actual browsing and lets you tune latency anywhere from 180 milliseconds to a second. If your agent is currently burning a frontier model's context budget just to fetch and summarize a webpage, this is a straightforward swap. Firecrawl's Research Index does something narrower but more precise: a search index built specifically for arXiv, hitting 53.3% recall at 32 cents a task. If your agent's job is literature review, that's the kind of number worth paying attention to.

I liked Superpowers 6.0 for a different reason — it has the agent optimize its own runs across Claude Code, Codex, and similar tools, and the developer claims a 60% cut in tokens and 50% faster builds. A piece on routing Fable 5 workloads by task complexity makes basically the same point in a more boring, more useful way: stop sending every task to your biggest model. It's not a clever trick, it's just something most people haven't gotten around to doing yet.

The one that actually stopped me mid-scroll was Declaw Arena — a CTF-style challenge where you try to compromise an agent running inside a microVM and pull a secret it's supposed to protect. If your agents have real permissions in production, I'd try this before someone else does it to you for real.

And if you'd rather define what your agent should do instead of prompt-engineering it into behaving, Speck takes a compiler-inspired approach — you write a spec, it generates the behavior. Worth a look if you're tired of tweaking prompts and calling it architecture.

None of this is a new framework. It's mostly people going back to agents they already shipped and asking two honest questions: is this too expensive, and can someone break it. Good questions to be asking yourself, too.