# signum

Signum is a contract-first proof gate for agentic software changes: it turns a task into a reviewed contract, executes against that contract, audits the result, and packages evidence that humans and CI can inspect.

- Tier: Indexed (plain plugin)
- Category: Development
- Page: https://www.flowy.sh/listings/heurema-signum
- Source: https://github.com/heurema/signum
- Price: free and open source

## Summary
signum is a Claude Code plugin with 6 hand-picked skills for development work, indexed on Flowy. Install it with the command on its page. It includes openspec-apply-change, openspec-archive-change, openspec-explore. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.

## Install (Claude Code)
```
npx -y skills add heurema/signum
```

## Skills
- openspec-apply-change
- openspec-archive-change
- openspec-explore
- openspec-propose
- openspec-sync-specs
- openspec-update-change

## FAQ

### What is signum?
Signum is a contract-first proof gate for agentic software changes: it turns a task into a reviewed contract, executes against that contract, audits the result, and packages evidence that humans and CI can inspect.

### How do I install signum?
Run these in Claude Code: npx -y skills add heurema/signum. Then prompt normally.

### Does signum auto-invoke its skills?
Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.

### Is signum free?
Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.