What is Tetriz Harness?
Tetriz Harness is an open source, self-hosted project for maintaining the instructions and tooling that guide AI coding agents such as Claude Code, Codex, Cursor and Kiro. A harness is the set of rules, skills, agents, commands, hooks and MCP config that steers these agents. The tool scans a repository and team coding signals to recommend improvements to that harness, such as finding problems in existing instructions.
After reviewing and approving a recommendation, you can roll it out through a control plane to selected developers, teams or a test group, using audience targeting for manual test and control rollouts. The project is pairable with Agent Desk through an ingestion adapter. The README describes the rollout UI as mock, so it is a work in progress.
Key features
- Repository-aware recommendations for changes to agent harness files
- Review and approve recommended rules, skills, hooks and agents
- Distribute approved changes to selected people or teams
- Audience targeting for manual test and control rollouts
- Pairs with Agent Desk via an ingestion adapter
- Self-hosted server with a control plane
Who is it for
- Engineering teams using AI coding agents
- Developer experience (DevEx) and platform teams
- Teams managing shared AI agent configuration
Pros and cons
- Open source under the MIT license
- Works with several coding agents including Claude Code, Codex, Cursor and Kiro
- Rollout UI is currently mock, according to the README
- Early-stage project with 12 stars and no forks
Tetriz Harness pricing
The vendor does not publish prices in a readable form (often pricing is shown only after signing in).
Is Tetriz Harness free?
Yes, there is a free plan. Free and open source under the MIT license; no paid plans listed.
Tetriz Harness alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 RegexAI | not listed | yes | Browser extensions |
 Pinokio | not listed | ? | Browser extensions |
 MaxAI | 12 USD/mo | yes | Browser extensions |
 HARPA AI | 55.4 PLN/mo | ? | Browser extensions |
 Gemini in Chrome | 97.99 PLN/mo | ? | Browser extensions |
 Sider | not listed | yes | Browser extensions |
All alternatives to Tetriz Harness →
FAQ
What is Tetriz Harness used for?
Recommends changes to AI coding agent harnesses (rules, skills, hooks, agents) from repo context, then distributes approved changes to teams.
Is Tetriz Harness free?
Yes, there is a free plan. Free and open source under the MIT license; no paid plans listed.
How much does Tetriz Harness cost?
No verified price in this directory. Check the current vendor pricing page.
What are the best Tetriz Harness alternatives?
Closest alternatives: RegexAI, Pinokio, MaxAI, HARPA AI, Gemini in Chrome.
Data checked October 17, 2026 on the vendor website (github.com).