Lean Ctx

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LeanCTX

Context Gateway for AI Systems.

Control what your AI can see.

LeanCTX sits between AI tools and the information they read. It selects task-relevant context, applies supported access and content controls before delivery, and records the context operations and delivery evidence it can observe. Your application, agent loop and model stay yours.

The open-source LeanCTX Engine runs locally through CLI, MCP, hooks and proxy paths. The LeanCTX SDK embeds supported Engine capabilities in your application.

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Where it sits

Files · repositories · tool results · configured providers
                          │
                          ▼
                LeanCTX Context Gateway
                Select → Control → Prove
                          │
                          ▼
                Your AI application / agent
                          │
                          ▼
                     Your model

• Select: give AI the context the task needs, with search, structural views, compression and reuse.
• Control: apply configured path permissions, content filters and context budgets to supported calls.
• Prove: inspect source references, policy decisions and usage evidence. A context-only integration records its prepared result; the host owns the subsequent model call.

For coding workflows, start with Claude Code, Cursor or Codex. The installation matrix distinguishes first-class paths from other compatibility references.

Your work	Start here
Improve the context path of existing AI tools	Community setup
Apply shared context controls across an organization	Enterprise — licensed controls and deployment scope
Build context control into your application	LeanCTX SDK — stable interfaces and separate SDK/OEM terms

What is LeanCTX? · Where LeanCTX fits · Architecture

See it in action:

  <strong>Read + Shell</strong>
  
  Map-mode reads + compressed CLI output
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  <strong>Gain (live)</strong>
  
  Token usage + estimated cost differences
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  <strong>Benchmark proof</strong>
  
  Measure compression by language + mode
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All GIFs are generated from reproducible VHS tapes in demo/.

Why developers use LeanCTX