Control what your AI can see. LeanCTX (Lean Context) is the context intelligence layer for AI agents — one local Rust binary that decides what they read, remembers what they learn, guards what they touch, and proves what they save. 60–90% fewer tokens as the receipt. 76 MCP tools, 30+ agents, local-first.
Cursor rule Cursor
Cursor rule "compression-safety" from yvgude/lean-ctx, covering compression safety — prevent lean-ctx marker corruption, the problem, rules for all agents, never write compressed content to files and file restoration commands.
Cursor rule
Shows lean-ctx (MCP) token metrics for this session at the end of each reply.
Cursor rule
Token optimization via lean-ctx Hybrid (Shell Hook + MCP).