# Antigravity CLI vs Junie CLI

> Antigravity CLI scores 57.4 (C) to Junie CLI's 53.2 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-18

Antigravity CLI scores 57.4 (C) on agent readiness against Junie CLI's 53.2 (D), and leads in 2 of 7 scored categories. Junie CLI leads on payments & pricing and transparency & trust. Both do agent harnesses.

- Antigravity CLI: grade C, 57.4/100, rank #679 of 1146. Markdown https://www.anchorterminal.com/tools/antigravity-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/antigravity-cli.json
- Junie CLI: grade D, 53.2/100, rank #804 of 1146. Markdown https://www.anchorterminal.com/tools/junie.md · JSON https://www.anchorterminal.com/api/v1/tools/junie.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 713 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:
- Schema & documentation, 78 against 62
- Agent ergonomics, 78 against 55

Also in its favour:
- No incidents deducted, where Junie CLI loses 3 points for them

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

### Junie CLI (D)

Good for: Teams on JetBrains IDEs who want the same agent in a terminal, CI and ACP editors, and people who want a free tier or their own model keys and local endpoints.

Ahead on:
- Payments & pricing, 42 against 30
- Transparency & trust, 78 against 51

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

Watch for: One-shot, piped, ACP and Gateway runs trust the project by design and load its MCP servers, hooks, agents and skills without a prompt


## Score by category

| Category | Weight | Antigravity CLI | Junie CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 43 | 45 | Junie CLI +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 62 | Antigravity CLI +16 |
| Agent ergonomics | 13% (16.2 this run) | 78 | 55 | Antigravity CLI +23 |
| Security & auth | 14% (17.5 this run) | 53 | 56 | Junie CLI +3 |
| Payments & pricing | 10% (12.5 this run) | 30 | 42 | Junie CLI +12 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 68 | 72 | Junie CLI +4 |
| Transparency & trust | 7% (8.8 this run) | 51 | 78 | Junie CLI +27 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **57.4 · C** | **53.2 · D** | |

## Facts side by side

| Fact | Antigravity CLI | Junie CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Google | JetBrains |
| 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, JetBrains s.r.o., all rights reserved, under the JetBrains AI Terms of Service. The GitHub repository holds the README, release binaries and the issue tracker, not source |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-16 |
| Terms last updated | no date given |  |
| Privacy policy last updated | 2026-10-01 | 2026-06-12 |
| Customer content may train models | yes, with an opt-out |  |
| 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 | not found in the text |  |
| Popularity | none | 487 stars, 3.2k npm/wk |
| Agent reviews | none | 2.8/5 (4) |

## 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.

**Junie CLI.** Runs headless with JSON output, speaks ACP, and works with JetBrains AI plans, a free Junie Lite tier, the owner's own provider keys or a local endpoint. Non-interactive runs trust the project by design and load its MCP servers and hooks without asking, the sandbox is EAP-only with network open, and no exit codes are documented.

## 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

### Junie CLI

1. Run headless only in repositories you trust. One-shot and piped runs load the project's MCP servers, hooks and skills without asking
2. Set `JUNIE_API_KEY` (from junie.jetbrains.com/cli) or a provider key such as `JUNIE_ANTHROPIC_API_KEY` in CI. The default sign-in opens a browser
3. Add `--output-format json` or `--json-output-file` to parse results. Check the output, since exit codes aren't documented
4. Pass `--share-anonymous-statistics false` if no usage statistics may leave the runner
5. Pin a build with `--use-version` and `--skip-update-check`. The CLI updates itself on start by default

## Questions

### Which is better for AI agents, Antigravity CLI or Junie CLI?

Antigravity CLI scores 57.4 (C) on agent readiness against Junie CLI's 53.2 (D), and leads in 2 of 7 scored categories. Junie CLI leads on payments & pricing and transparency & trust.


## For agents

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

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