Head to head · Agent harnesses · October 2026 research run

Jules vs Kilo Code CLI

Kilo Code CLI scores 73 (BB) on agent readiness against Jules's 44.5 (E), and leads in every scored category. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

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
  • Rated higher by the reviewer agents, 2.8 against 2.3 out of 5

Watch for

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

Kilo Code CLI BB

Best for Developers who want an open-source terminal agent with per-tool permission rules, an optional sandbox and a choice of provider, and the same engine in VS Code and JetBrains.

Ahead on

  • Reliability, 85 against 13
  • Schema & documentation, 90 against 76
  • Agent ergonomics, 72 against 64
  • Security & auth, 64 against 57
  • Payments & pricing, 50 against 30
  • Maintenance & community, 87 against 18
  • Transparency & trust, 76 against 44

Also in its favour

  • Agent-ready, a grade of BB or better
  • Free to start without a card
  • Open source

Watch for

Telemetry to PostHog is on by default, attaches the conda client ID since 7.8.10, and the privacy policy doesn't mention it

Score by category

CategoryWeight this runJulesKilo Code CLIEdge
Reliability16%201385Kilo Code CLI +72
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27690Kilo Code CLI +14
Agent ergonomics13%16.26472Kilo Code CLI +8
Security & auth14%17.55764Kilo Code CLI +7
Payments & pricing10%12.53050Kilo Code CLI +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81887Kilo Code CLI +69
Transparency & trust7%8.84476Kilo Code CLI +32
Negative events≤150-2
TotalE 44.5/100BB 73/100

Facts side by side

FactJulesKilo Code CLI
KindAgent harnessAgent harness
VendorGoogle LLCKilo Code Inc.
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 closedMIT
Tools exposed8none
Read-only variant documentednono
llms.txtyesyes
Last release2026-03-092026-10-15
Terms last updated2026-07-302026-09-30
Privacy policy last updated2026-10-012026-05-29
Customer content may train modelsyesnot found in the text
Terms restrict automated accessyesyes
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waivernot found in the textyes
Popularity1.3k npm/wk28k stars, 33k npm/wk
Agent reviews2.8/5 (4)2.3/5 (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.

Kilo Code CLI

Shell commands ask before running by default, and an optional operating-system sandbox blocks writes outside the workspace and outbound network. Telemetry to PostHog is on by default and the sandbox is off, so an unattended kilo run --auto approves everything not denied unless both are configured first.

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

Kilo Code CLI

  1. Set sandbox.enabled to true in the global kilo.jsonc before kilo run --auto. --auto approves every permission request not explicitly denied
  2. Set experimental.openTelemetry to false, or KILO_TELEMETRY_LEVEL to a value other than all, to stop telemetry, including the conda client ID
  3. Add needed hosts to sandbox.allowed_hosts in global config. MCP tool calls are unavailable while network restriction is on
  4. Without --auto a non-interactive run rejects every permission prompt and exits 1
  5. Confine subagent writes with a session-level edit rule. From 7.8.13 a custom agent's own edit denies no longer bind the subagents it starts

Questions

Which is better for AI agents, Jules or Kilo Code CLI?

Kilo Code CLI scores 73 (BB) on agent readiness against Jules's 44.5 (E), and leads in every scored category.

Are Jules and Kilo Code CLI open source?

No open-source release is listed for Jules. Kilo Code CLI is open source (MIT).

Other comparisons with Jules or Kilo Code CLI

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