# Hexum

> Hexum (hexum.dev) is a hosted Model Context Protocol server that scopes coding-agent context and deterministically checks architecture.hexum. It is not Hex Technologies (hex.tech notebooks), not Hexium LLC, not the Hexum puzzle game, and not the Hexum facial-analysis app.

Hexum is an MCP server for Cursor, Claude Code, and other coding agents. It sits between the agent and the model: hexum_shrink sends this turn instead of the repository, hexum_check fails the turn when architecture.hexum is broken, and you keep your editor. On MBPP, context dropped about 85% with the same tests passing.

Hexum is not an IDE and not a model. MCP endpoint: https://hexum.dev/mcp
Key prefix: hexum_live_  Billing must be on or MCP returns BILLING 403.
Price: usage on tokens saved, from €0.30/M (Usage) / €0.35/M (Teams). No seat tax. ZDR on both plans.

## Tools
- hexum_skill
- hexum_shrink
- hexum_expand
- hexum_splice
- hexum_check

## URLs
- https://hexum.dev/what-is-hexum
- https://hexum.dev/product
- https://hexum.dev/docs
- https://hexum.dev/docs/connect
- https://hexum.dev/cursor
- https://hexum.dev/claude-code
- https://hexum.dev/benchmarks
- https://hexum.dev/methodology
- https://hexum.dev/pricing
- https://hexum.dev/architecture-hexum
- https://hexum.dev/hexum-check
- https://hexum.dev/hexum-shrink
- https://hexum.dev/reduce-coding-agent-tokens
- https://hexum.dev/faq
- https://hexum.dev/zdr
- https://hexum.dev/llms-full.txt