codebase-explainer

Use when building a mental model of an unfamiliar repo. Trigger phrases: "how does this codebase work", "walk me through this project", "explain the architecture", "what does this service do", "trace how a request flows", "where does X live in the code", "onboard me to this repo", "I need to change Y, what does it touch", "map out the layers", "give me the tour". Reads the source to map architecture layers, trace execution paths end-to-end, and surface key abstractions + dependencies. Do NOT use for external library or framework docs (use docs-agent), for comparing approaches or tech choices (use research-agent), or for planning a concrete change (use writing-plans).