# Antigravity CLI vs Kiro CLI

> Kiro CLI scores 59.9 (C) to Antigravity CLI's 57.7 (C) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/antigravity-cli-vs-kiro-cli
- Markdown: https://www.anchorterminal.com/compare/antigravity-cli-vs-kiro-cli.md (~2,800 tokens)
- Slim: https://www.anchorterminal.com/compare/antigravity-cli-vs-kiro-cli.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-10

Kiro CLI scores 59.9 (C) on agent readiness against Antigravity CLI's 57.7 (C), and leads in 6 of 7 scored categories. Antigravity CLI leads on agent ergonomics. Both do agent harnesses.

- Antigravity CLI: grade C, 57.7/100, rank #599 of 954. Markdown https://www.anchorterminal.com/tools/antigravity-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/antigravity-cli.json
- Kiro CLI: grade C, 59.9/100, rank #537 of 954. Markdown https://www.anchorterminal.com/tools/kiro-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/kiro-cli.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 186 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Antigravity CLI (C)

Good for: Developers on Google AI plans or Gemini Enterprise who want a terminal agent with a sandbox on by default and access to several model families, depending on plan.

Ahead on:
- Agent ergonomics, 78 against 67

Also in its favour:
- No incidents deducted, where Kiro CLI loses 4 points for them

Watch for: Closed source. The repository holds the README, changelog and examples, with no source and no licence file

### 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.

Ahead on:
- Reliability, 57 against 43
- Security & auth, 66 against 53
- Payments & pricing, 40 against 30
- Maintenance & community, 73 against 68
- Transparency & trust, 67 against 54

Also in its favour:
- Free to start without a card

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 | Antigravity CLI | Kiro CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 43 | 57 | Kiro CLI +14 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 79 | Kiro CLI +1 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 67 | Antigravity CLI +11 |
| Security & auth | 14% (17.5 this run) | 53 | 66 | Kiro CLI +13 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Kiro CLI +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 68 | 73 | Kiro CLI +5 |
| Transparency & trust | 7% (8.8 this run) | 54 | 67 | Kiro CLI +13 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **57.7 · C** | **59.9 · C** | |

## Facts side by side

| Fact | Antigravity 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 | Proprietary. The repository holds the README, changelog and examples, with no source and no licence file. Use is under the Google Antigravity Additional Terms of Service, the Google Terms of Service and the Privacy Policy | 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 | 2026-10-08 | 2026-10-05 |
| Terms last updated |  | 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 |  | 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 | none | 4.4k stars |

## Verdicts

**Antigravity CLI.** Google's terminal agent, shipped as a closed-source binary with a terminal sandbox on by default on macOS and Linux and documented headless JSON output. Interactions are used to improve Google products unless users opt out, and a headless run exits 0 when a tool is denied.

**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

### Antigravity CLI

1. Read the `status` field from `--output-format json` and read stderr too. A tool refused for lack of approval still exits 0
2. Pre-approve each shell command and tool a headless run needs with `action(target)` rules under `permissions.allow` in ~/.gemini/antigravity-cli/settings.json, because headless runs cannot ask
3. Export `GEMINI_API_KEY` after setting modelProvider to gemini. The CLI won't start when the key is missing, and setting the variable alone has no effect
4. Turn off Enable Telemetry in the Account settings before running on private repositories if Interactions should not be used for product improvement
5. Set `--print-timeout` explicitly. The docs give a five-minute default, while `agy --help` shows 0s

### 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, Antigravity CLI or Kiro CLI?

Kiro CLI scores 59.9 (C) on agent readiness against Antigravity CLI's 57.7 (C), and leads in 6 of 7 scored categories. Antigravity CLI leads on agent ergonomics.


## For agents

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

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