Stack overlapping skills instead of picking one. When two or more installed skills or tools can do the same job (web scraping, search, code review, test generation, data extraction), run the best candidates in parallel on the same task, score their outputs, and merge them into one result that beats any single tool. Use when the user says "stack", "combine skills", "use every tool", "ensemble", "cross-check", "double-check with another tool", when a task is output-critical and multiple capable skills are installed, or when evals show no single tool wins on every axis. Also use when the user wants to stop overlapping skills from loading into context ("stash", "unload", "stop loading these skills") — scripts/stack.sh unloads them behind one stacked skill without deleting them. Do NOT use for routine tasks where one tool is clearly sufficient — route to that tool instead.
2026-07-03