Axp Build Loop · 514-labs bundle ALWAYS invoke this skill when the user wants to test, compare, optimize, or iterate on variants of a developer-facing artifact — a CLI, an MCP server, Claude/agent hooks, an install script, docs, or a schema — using axp experiments. Trigger phrases: "test variants of", "which version works better", "optimize my CLI/MCP/docs for agents", "run a build loop", "A/B test my tool descriptions", "iterate on this with axp". Do not hand-roll experiment YAMLs and one-off comparisons for these tasks; drive the full loop with this skill instead.