Hexum

This overview is the activity of a Hexum session: what you put in the repo, what the agent calls, what comes back, what you review. It does not describe how Hexum compresses or checks internally.

Read in this order

1. A session — billing, key, paste MCP, architecture file, turn loop.
2. Connect — Bearer header, AUTH vs BILLING.
3. architecture.hexum — layers and rules.
4. Tools — hub tools/list, plus product hosts that list a subset.

Tool	When
hexum_skill	First Hexum use this session if SKILL.md is missing, or when intensity changes.
hexum_shrink	Before reading a repo or a wide file set.
hexum_expand	When one folded function, class, or method is the thing to patch.
hexum_splice	When applying the patch.
hexum_check	Before claiming the turn is done.
hexum_review	When reviewing a git diff or a GitHub pull request.
hexum_control_status	When the agent is repeating edits or failing the same check.
hexum_loop_start	When starting a gated build loop for a goal.

What Hexum is not

• Not an IDE. Not a customer CLI. Not a model.
• Not a store of your repo. ZDR.
• Not a spend cap. Usage billing.

Get a key Skill

FAQ

What is Hexum?

Hexum is a developer ecosystem for coding agents in Cursor, Claude Code, and the rest. One API key. Five products and twelve tools today: spend less on each prompt, block bad imports, review pull requests, stop the agent looping, and only keep building when checks pass. We do not keep your code.

Does Hexum replace Cursor or Claude Code?

No. You keep Cursor, Claude Code, Antigravity, Codex, or Grok. Hexum is not an editor and not a model. You paste a key into the agent you already use.

How does Hexum cut what I pay the model?

Your agent stops dumping the whole repo into the prompt. Hexum sends this task, not every file. On the published card, MBPP context dropped 85.2% and the combined 24-task cut is 87.6%, with 24/24 tests still passing. Tokens are ceil(utf8_bytes/4), not a provider invoice. See /benchmarks.

Does the architecture check use an AI?

No. It reads a rules file in your repo and reports forbidden imports. It does not call a model, so it does not guess.

How is Hexum billed?

You pay for what your agent sent Hexum. Usage €0.30 per million tokens. Teams €0.35 per million. No per-person fee. No monthly cap. See /pricing.

What does the dashboard mean by tokens saved?

How much smaller the reply was than what the agent sent, when that is a cut. Your invoice is still based on what the agent sent Hexum, not on the savings.

Does Hexum store my repo?

No. We do not keep the code your agent sends. We do not train on it. Policy: /zdr.

How do I add Hexum to Cursor?

Create a key at /app, paste the one-sentence prompt into Cursor, and let the agent write the MCP config. Starter works until two million tokens this month. Details: /cursor.