LeanCTX: a local Rust binary that gates what your agent can read.

LeanCTX is a single Rust binary acting as a context-intelligence layer, deciding which files an agent reads, remembering what it learns, and guarding sensitive content. It's a concrete answer to the context-engineering problem of keeping the window lean instead of dumping whole repos into the model. It hits two pains at once: token cost and secrets leaking into context. Given the tool-poisoning and secret-leak stories in Security, a local gate on what the agent can even see is a sensible defense layer.