Ask HN: Resources for building AI agents for software development?

I've come across a few tools and platforms, but I’m still trying to make sense of the space:

- AI Native Dev Tooling Landscape: super comprehensive list, but honestly overwhelming. Not sure which tools are actually useful for building agents vs. just using them. https://landscape.ainativedev.io/

I've heard of Crew AI (but haven’t tried it yet). https://www.crewai.com/

I saw Google’s announcement about building your own agents with Vertex, but haven't dug into it yet. https://cloud.google.com/products/agent-builder

A few open questions I’m wrestling with:

- What are the best starting points for building agents for dev work?

- Are there any open-source frameworks people recommend?

- Is it worth the effort to build your own vs. just using more mature tools (e.g. Cursor or Zed, Replit Ghostwriter, Windsurf, Devin, etc.)?

Would love any suggestions, frameworks, lessons learned, or even reasons not to go down this path.

Thanks!