gsd-2

GSD-2 is what happens when someone takes "context rot" seriously. Most AI coding agents lose the plot after 30 minutes of work — GSD fixes that with spec-driven development, structured context injection, and automatic context clearing between tasks. Built on the Pi SDK, it can use different models for different phases: Opus for planning, Sonnet for execution.

If you're building anything that takes more than a single session to complete, GSD keeps your agent on the rails. The meta-prompting approach means your agent gets exactly the right files at dispatch time instead of stuffing everything into context. Trusted by engineers at Amazon, Google, and Shopify. Alternatives: raw CLAUDE.md files work for small projects. Aider has its own context management but less structure. Cursor's composer is the commercial equivalent.

The catch: GSD adds ceremony. You need specs, milestones, and structured planning before writing code. If you're hacking a weekend project, that overhead kills the vibe. Best for teams or serious solo builders shipping real products.