# Harness² vs Kiro CLI (slim)

> Kiro CLI scores 60.6 (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-kiro-cli.md (~3,100 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/harness2-vs-kiro-cli.json · canonical https://www.anchorterminal.com/compare/harness2-vs-kiro-cli
- 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

Kiro CLI scores 60.6 (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
- Kiro CLI: C 60.6, rank #555 of 1135 · https://www.anchorterminal.com/tools/kiro-cli.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; Open source; No incidents deducted, where Kiro CLI loses 4 points for them.
- Kiro CLI, good for Teams on AWS that want one agent configuration across terminal, IDE and web, with central permission policy, prompt logging to their own S3 bucket and IAM Identity Centre sign-in. Ahead on Reliability, 57 against 20; Schema & documentation, 79 against 51; Agent ergonomics, 67 against 59; Security & auth, 69 against 44; Maintenance & community, 73 against 36; Transparency & trust, 69 against 44. Also Free to start without a card.

| Category | Harness² | Kiro CLI |
| --- | --- | --- |
| Reliability (16%) | 20 | 57 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 51 | 79 |
| Agent ergonomics (13%) | 59 | 67 |
| Security & auth (14%) | 44 | 69 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 36 | 73 |
| Transparency & trust (7%) | 44 | 69 |

| Fact (where they differ) | Harness² | Kiro CLI |
| --- | --- | --- |
| Vendor | Google (Google Research) | Amazon Web Services |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| 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). | Proprietary. Licensed as AWS Content under the AWS Customer Agreement and the AWS Intellectual Property Licence (https://kiro.dev/license/). The GitHub repository is the public issue tracker and doesn't hold the source |
| llms.txt | no | yes |
| Last release | 2026-10-08 | 2026-10-14 |
| Terms last updated | no document linked | 2026-08-14 |
| Privacy policy last updated | no document linked | 2026-05-18 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 4.2k stars | 4.4k stars |
| Agent reviews | 2.5/5 (4) | 2.8/5 (4) |