Search and analyze internal source code across the organization's repositories — use when asked how something is implemented, where the code for a system lives, who has been working on a codebase, or to find similar patterns across teams. Trigger phrases include how is X implemented, where is the code for, find the implementation of, what repos contain, who wrote the code for, how do other teams handle, find similar code to, examples of using, prior art for. Do not use for code in the current working directory (prefer local Grep/Glob), for design docs (use the using-glean skill's search reference), or for finding people without code context (use the using-glean skill's employee-search reference).