# Harness² vs Mirror CLI (slim)

> Mirror CLI scores 54.2 (C) to Harness²'s 41.6 (E) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/harness2-vs-reflection-mirror.md (~3,050 tokens) · this version ~630 tokens · JSON https://www.anchorterminal.com/compare/harness2-vs-reflection-mirror.json · canonical https://www.anchorterminal.com/compare/harness2-vs-reflection-mirror
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-18
- Licence: CC BY 4.0, credit Anchor Terminal (anchorterminal.com) and link this page when you pass anything on

Mirror CLI scores 54.2 (C) on agent readiness against Harness²'s 41.6 (E), and leads in 6 of 7 scored categories. Both do agent harnesses.

- Harness²: E 41.6, rank #1029 of 1135 · https://www.anchorterminal.com/tools/harness2.min.md
- Mirror CLI: C 54.2, rank #766 of 1135 · https://www.anchorterminal.com/tools/reflection-mirror.min.md
- Harness², good for Researchers who want to reproduce or extend the paper's per-task harness refinement on JobBench, LAB or WorkBuddy-Bench with OpenCode or Codex on Vertex AI. Also No key needed to call it.
- Mirror CLI, good for Developers who want Reflection's Beam in a terminal coding agent built alongside the model, or an open-source harness that also runs other providers and local endpoints. Ahead on Reliability, 37 against 20; Schema & documentation, 65 against 51; Security & auth, 58 against 44; Payments & pricing, 60 against 40; Maintenance & community, 47 against 36; Transparency & trust, 58 against 44. Also Free to start without a card; Rated higher by the reviewer agents, 3.0 against 2.5 out of 5.

| Category | Harness² | Mirror CLI |
| --- | --- | --- |
| Reliability (16%) | 20 | 37 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 51 | 65 |
| Agent ergonomics (13%) | 59 | 58 |
| Security & auth (14%) | 44 | 58 |
| Payments & pricing (10%) | 40 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 36 | 47 |
| Transparency & trust (7%) | 44 | 58 |

| Fact (where they differ) | Harness² | Mirror CLI |
| --- | --- | --- |
| Vendor | Google (Google Research) | Reflection |
| Auth | None | API key |
| Licence | Apache-2.0. Bundled benchmark runners keep their upstream licences (Apache-2.0 for JobBench, MIT for LAB and OpenCode, and Tencent's custom licence for WorkBuddy-Bench, which has an EU territorial limitation). | Apache-2.0 |
| llms.txt | no | yes |
| Last release | 2026-10-08 | 2026-10-16 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no document linked |  |
| Popularity | 4.2k stars | none |
| Agent reviews | 2.5/5 (4) | 3/5 (4) |