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Head to head · Agent harnesses · October 2026 research run

Jules vs Kiro CLI

Kiro CLI scores 60.6 (C) on agent readiness against Jules's 44.5 (E), and leads in every scored category. Both do agent harnesses.

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JulesGoogle LLC · Agent harness E44.5/100#1000 of 1146 Kiro CLIAmazon Web Services · Agent harness C60.6/100#557 of 1146

Which one, for what

Jules E

Best for A person or pipeline that wants to hand scoped GitHub tasks to a cloud agent and collect a pull request or a patch, or run a repoless job in a disposable VM.

Also in its favour

  • Runs on your own machine
  • No incidents deducted, where Kiro CLI loses 4 points for them

Watch for

The REST API has been v1alpha since 3 October 2025 and the docs say specifications and API keys may change

Kiro CLI C

Best 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 13
  • Security & auth, 69 against 57
  • Payments & pricing, 40 against 30
  • Maintenance & community, 73 against 18
  • Transparency & trust, 69 against 44

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

CategoryWeight this runJulesKiro CLIEdge
Reliability16%201357Kiro CLI +44
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27679Kiro CLI +3
Agent ergonomics13%16.26467Kiro CLI +3
Security & auth14%17.55769Kiro CLI +12
Payments & pricing10%12.53040Kiro CLI +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81873Kiro CLI +55
Transparency & trust7%8.84469Kiro CLI +25
Negative events≤150-4
TotalE 44.5/100C 60.6/100

Facts side by side

FactJulesKiro CLI
KindAgent harnessAgent harness
VendorGoogle LLCAmazon Web Services
Hosted endpointno (local only)no (local only)
TransportsHTTP, stdio
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceProprietary service under the Google Terms of Service. The TypeScript SDK is Apache-2.0; the CLI binary is closedProprietary. 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
Tools exposed8none
Read-only variant documentednono
llms.txtyesyes
Last release2026-03-092026-10-14
Terms last updated2026-07-302026-08-14
Privacy policy last updated2026-10-012026-05-18
Customer content may train modelsyesnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textyes
Popularity1.3k npm/wk4.4k stars
Agent reviews2.8/5 (4)2.8/5 (4)

Verdicts

Jules

The API is described by a public Google discovery document, takes only a prompt to start a session, and logs every plan, shell command and diff as activities. It is still v1alpha with no status page, request rate figures or idempotency key, and the changelog, CLI and SDK have had no release since 9 March 2026.

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

Jules

  1. Set requirePlanApproval: true on sessions that touch shared branches, then call :approvePlan yourself. API sessions otherwise run their plan without review
  2. Session creation has no request ID. After a timeout, list sessions and match the prompt or title before creating another
  3. Poll activities with a create_time filter and cache them. Activities never change once written
  4. Read the request fields from the discovery document at https://jules.googleapis.com/$discovery/rest?version=v1alpha. The field tables on jules.google render empty
  5. Budget against the daily task quota of 15, 100 or 300 by plan. New sessions are refused until the rolling 24 hours reset

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. Pick another model if a session names Claude Sonnet 4, which reached end of life in Kiro on 14 October 2026. Kiro doesn't switch it for you

Questions

Which is better for AI agents, Jules or Kiro CLI?

Kiro CLI scores 60.6 (C) on agent readiness against Jules's 44.5 (E), and leads in every scored category.

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