foolproof-product

Use this skill on ANY code change in codevira's product surface (mcp_server/, indexer/). Triggers on Edit/Write to product code, on phrases like "fix bug", "add feature", "handle error", or any modification to commands the end-user runs. Enforces 10 product — reliability principles: no silent failures, atomic state mutations, defensive parsing, bounded resources, predictable detection, reversible operations, helpful…