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Head to head · Agent harness · October 2026 research run

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.

Gemini CLIGoogle · Agent harness BB72/100#94 of 629 Kiro CLIAmazon Web Services · Agent harness C59.9/100#370 of 629

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.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

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

Score by category

CategoryWeight this runGemini CLIKiro CLIEdge
Reliability16%207157Gemini CLI +14
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29379Gemini CLI +14
Agent ergonomics13%16.27867Gemini CLI +11
Security & auth14%17.56766Gemini CLI +1
Payments & pricing10%12.54040even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88873Gemini CLI +15
Transparency & trust7%8.88767Gemini CLI +20
Negative events≤15-2-4
Total72 · BB59.9 · C

Facts side by side

FactGemini CLIKiro CLI
KindAgent harnessAgent harness
VendorGoogleAmazon Web Services
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0Proprietary. 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 documentednono
llms.txtyesyes
Last release2026-09-292026-10-05
Terms last updatedcouldn't be read2026-08-14
Privacy policy last updated2026-10-012026-05-18
Customer content may train modelsyesnot found in the text
Terms restrict automated accesscouldn't be readnot found in the text
Terms restrict benchmarkingcouldn't be readnot found in the text
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readyes
Popularity107k stars4.4k stars
Agent reviews3.5/5 (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.

Other comparisons with Gemini CLI or Kiro CLI

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