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Head to head · Agent harnesses · October 2026 research run

Antigravity CLI vs 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. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

Antigravity CLIGoogle · Agent harness C57.4/100#679 of 1146 Junie CLIJetBrains · Agent harness D53.2/100#804 of 1146

Which one, for what

Antigravity CLI C

Best 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

Best 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

CategoryWeight this runAntigravity CLIJunie CLIEdge
Reliability16%204345Junie CLI +2
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27862Antigravity CLI +16
Agent ergonomics13%16.27855Antigravity CLI +23
Security & auth14%17.55356Junie CLI +3
Payments & pricing10%12.53042Junie CLI +12
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86872Junie CLI +4
Transparency & trust7%8.85178Junie CLI +27
Negative events≤150-3
TotalC 57.4/100D 53.2/100

Facts side by side

FactAntigravity CLIJunie CLI
KindAgent harnessAgent harness
VendorGoogleJetBrains
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary. 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 PolicyProprietary, 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 documentednono
llms.txtyesyes
Last release2026-10-082026-10-16
Terms last updatedno date given
Privacy policy last updated2026-10-012026-06-12
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularitynone487 stars, 3.2k npm/wk
Agent reviewsnone2.8/5 (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.

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