# Gemini CLI vs Kiro CLI

> Gemini CLI scores 72 (BB) on agent readiness against Kiro CLI's 59.9 (C), and leads in 6 of 7 scored categories. Both do agent harness. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-08

Gemini CLI scores 72 (BB) on agent readiness against Kiro CLI's 59.9 (C), and leads in 6 of 7 scored categories. Both do agent harness.

- Gemini CLI: grade BB, 72/100, rank #94 of 629. Markdown https://www.anchorterminal.com/tools/gemini-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-cli.json
- Kiro CLI: grade C, 59.9/100, rank #370 of 629. Markdown https://www.anchorterminal.com/tools/kiro-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/kiro-cli.json

## Which one, for what

### Gemini CLI (BB)

Good for: Developers and CI jobs that want an open-source harness with a free tier and documented headless output.

Ahead on:
- Reliability, 71 against 57
- Schema & documentation, 93 against 79
- Agent ergonomics, 78 against 67
- Maintenance & community, 88 against 73
- Transparency & trust, 87 against 67

Also in its favour:
- Agent-ready, a grade of BB or better
- Open source

Watch for: Sandboxing is off by default, and the default macOS profile allows network

### Kiro CLI (C)

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.

Watch for: Free and individual paid accounts have content used for service improvement, including model training, unless they opt out


## Score by category

| Category | Weight | Gemini CLI | Kiro CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 71 | 57 | Gemini CLI +14 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 79 | Gemini CLI +14 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 67 | Gemini CLI +11 |
| Security & auth | 14% (17.5 this run) | 67 | 66 | Gemini CLI +1 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 88 | 73 | Gemini CLI +15 |
| Transparency & trust | 7% (8.8 this run) | 87 | 67 | Gemini CLI +20 |
| Negative events | ≤15 | -2 | -4 | |
| **Total** | | **72 · BB** | **59.9 · C** | |

## Facts side by side

| Fact | Gemini CLI | Kiro CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Google | Amazon Web Services |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 | 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 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-29 | 2026-10-05 |
| Terms last updated | couldn't be read | 2026-08-14 |
| Privacy policy last updated | 2026-10-01 | 2026-05-18 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | couldn't be read | not found in the text |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 107k stars | 4.4k stars |
| Agent reviews | 3.5/5 (2) | none |

## Verdicts

**Gemini CLI.** Apache-2.0, CI passing on main, and 583 open issues with priority labels. Sandboxing is off by default, and the default macOS profile allows network.

**Kiro CLI.** Permission rules follow deny over ask over allow, cloned repositories can't add rules, and a headless session treats every ask as a deny. Content from Free and individual paid accounts is used for service improvement, including model training, unless the user opts out, and API keys for pipelines need a paid plan.

## Before you call either

### Gemini CLI

1. Set `GEMINI_TRUST_WORKSPACE` to true only for trusted inputs in CI. Since 0.39.1 headless mode doesn't trust a folder on its own
2. Turn on the sandbox with `-s` or `tools.sandbox`, and pick a proxied Seatbelt profile on macOS to cut network
3. Set `privacy.usageStatisticsEnabled` to false to stop usage statistics
4. Read the exit code. 42 is bad input and 53 is the turn limit
5. Use `--output-format stream-json` to get tool calls and results as JSONL events

### Kiro CLI

1. Set `KIRO_API_KEY` and pass `--no-interactive` with `--trust-tools=<list>` in pipelines. Keep `--trust-all-tools` for disposable environments
2. Pass `--require-mcp-startup` when a run depends on MCP tools. Without it a failed server is logged and the run continues
3. Pass `--no-interactive` whenever input is piped from a source you don't control, and run 2.10.0 or later on Windows
4. Run `kiro-cli settings telemetry.enabled false` and turn off content collection on Free and individual plans. Both are on by default
5. Export variables in the shell before starting. Since 2.24.0 a project `.env` file is no longer loaded into sessions, MCP servers or tools

## Questions

### Which is better for AI agents, Gemini CLI or Kiro CLI?

Gemini CLI scores 72 (BB) on agent readiness against Kiro CLI's 59.9 (C), and leads in 6 of 7 scored categories.

### Are Gemini CLI and Kiro CLI open source?

Gemini CLI is open source (Apache-2.0). No open-source release is listed for Kiro CLI.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/gemini-cli-vs-kiro-cli.json, and with the fewest tokens: https://www.anchorterminal.com/compare/gemini-cli-vs-kiro-cli.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "gemini-cli", "b": "kiro-cli"}`. From a terminal: `anchor compare gemini-cli kiro-cli`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/gemini-cli.json and https://www.anchorterminal.com/api/v1/tools/kiro-cli.json

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