Spec-driven development with persistent markdown planning. Use when: complex tasks (>5 tool calls), multi-step work, GitHub issues, research tasks, building projects. Creates plan.md, spec.md, findings.md, progress.md in .project/{issue#}/ directory.
Cloudflare edge platform patterns for Workers, Agents SDK, MCP servers, Vectorize, and Workflows. Use when building on Cloudflare infrastructure.