Arbiter
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High-performance multi-agent simulation and auditing framework in Rust
Key Features
Multi-Agent Single Agent Async Support Shared Memory Plugin System Custom Tools Sandboxing CLI Self-Hosted
Community Feedback
Strengths
- Rust performance
- Strong simulation capabilities
- Audit-ready
Weaknesses
- Rust expertise required
- AGPL license
- Niche use case
Arbiter Details
| Organization | Harness Labs |
| Organization Type | Company |
| Funding | Series a |
| Category | AI Harness |
| Subcategory | Orchestration |
| Deployment | SDK/Framework |
| Primary Language | Rust |
| Runtime | Rust 1.70+ |
| License | AGPL-3.0 |
| Commercial Use | Copyleft |
| Install Command | cargo add arbiter |
| GitHub Stars | 731 |
| GitHub Forks | 77 |
| Contributors | 30 |
| Last Commit | 2026-03-02 |
| First Release | 2022-11-19 |
| Maturity | Beta |
| Pricing Model | Free |
| Free Tier | Open source under AGPL-3.0 |
| Self-Hosted Free | Yes |
| Cost Model | free + LLM costs |
| Community Size | Small |
| Community Activity | Active |
| Sentiment | Positive |
| GPU Required | No |
| Research Date | 2026-03-27 |
| API Keys Required | LLM provider API key |
Use Cases
- Agent simulation
- System auditing
- Multi-agent testing
- Protocol design
When to Use
Best for: High-performance agent simulation and protocol auditing
Avoid when: Python-first teams or LLM-centric orchestration needs
Original data from HuggingFace, OpenCompass and various public git repos.
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Release v20260328a