# subagentprompts.com — the Prompt Engineering primitive > A durable, D1-backed catalog of real prompting techniques and guardrails, grounded in this repo's own docs mirror and live doc fetches — plus the real Sonnet-main/Fable-advisor pairing this session used. ## API - GET /api/prompt-techniques — list prompt technique/guardrail rows, each citing an exact source doc - GET /api/prompt-techniques/:id — a single prompt technique row as JSON - GET /api/changes — newest-first change feed (?cursor=&limit=) for polling agents - POST /mcp — Streamable-HTTP MCP endpoint (initialize / tools/list / tools/call get_prompt_techniques); server card at /.well-known/mcp/server-card.json ## Family This site is one of 36 Cloudflare Workers in the subagent*.com family. For the live, machine-readable directory of every sibling domain, Cloudflare zone ID, and worker binding, fetch: https://subagentsubdomains.com/api/dns-zones For a unified catalog of every API route across every primitive in the family: https://subagentapi.com/api/catalog