The stack in detail.
Knowledge is created in the engine, sealed as a package, distributed through the registry and checked against the standard. Each layer works on its own and can be replaced by your own implementation.
4 layers · 3 live · 1 in development
Layer · Enforcement
LeanCTX
Open-source context engine
LeanCTX sits between AI tool and codebase and makes sure every token carries signal. The engine compresses files and shell output before they cost context, keeps decisions and findings across sessions, and enforces policy: what may an agent see, and what did it provably see?
- One Rust binary, fully local, no telemetry
- AST analysis for 18 programming languages
- Session memory and a knowledge base across sessions
- Policy packs and signed evidence bundles
- Works with Cursor, Claude Code and 30+ other tools
- Cloud subscription for teams: sync, SSO, compliance
Layer · Law
CTXPKG
The open standard
CTXPKG defines how a context package is built: typed entries, provenance, integrity hashes, signatures. The specification can be implemented in a day and verified offline. It deliberately lives outside the company and changes only through the public RFC process.
- Spec v2 with JSON schemas and test vectors
- SHA-256 integrity, Ed25519 signatures
- Verifiable offline, no registry required
- Two independent verifiers: Rust and TypeScript
- Public RFC process, vendor-neutral
Layer · Distribution
CTXPKG Registry
Registry & marketplace
The registry is the distribution point for context packages: publish, search, install, sell. Every submitted version gets inspected, the report is published and the version is frozen. If you trust a download, you can say why.
- Public trust report for every version
- Immutable, signed versions
- Public packages free, Pro from €9 per month
- Publishers keep 85 percent of every sale
- No paid ranking, no purchased verification
Layer · Connection
CTXFabric
Enterprise context platform
CTXFabric brings the stack to organizations that don't work in a terminal. The platform imports knowledge from the systems where it lives today, supports curation with a clear method, and exports inspected, signed context packages. A dashboard shows which agent works with which knowledge.
- Import from Confluence, SharePoint and document stores
- Guided curation, operated in the browser
- Export in the CTXPKG format, signed from day one
- Governance dashboard for knowledge usage
- First pilots through the advisory program
The format
A package carries its knowledge, its provenance and its signature.
Adopting it with guidance?
CTX Advisory brings the stack into your organization in three steps.