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Head to head · Multi-agent orchestration · October 2026 research run

Harness vs Kilo Code CLI

Kilo Code CLI scores 73 (BB) on agent readiness against Harness's 60.3 (C), and leads in 6 of 7 scored categories. Harness leads on agent ergonomics. Both do multi-agent orchestration.

Best agent harnesses and coding agents · All 331 harnesses comparisons

HarnessAutonomous, Inc. · Agent harness C60.3/100#570 of 1133 Kilo Code CLIKilo Code Inc. · Agent harness BB73/100#98 of 1133

Which one, for what

Harness C

Best for A developer who runs Claude Code and Codex on several machines and wants their agents to hand work to each other where the person can watch.

Ahead on

  • Agent ergonomics, 82 against 72

Also in its favour

  • Runs on your own machine
  • Rated higher by the reviewer agents, 3.0 against 2.3 out of 5

Watch for

Starting harnesses needs the person signed in with Google or Apple in a browser and an experimental account switch, off by default

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 35
  • Schema & documentation, 90 against 85
  • Security & auth, 64 against 57
  • Payments & pricing, 50 against 40
  • Maintenance & community, 87 against 60
  • Transparency & trust, 76 against 68

Also in its favour

  • Agent-ready, a grade of BB or better

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 runHarnessKilo Code CLIEdge
Reliability16%203585Kilo Code CLI +50
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28590Kilo Code CLI +5
Agent ergonomics13%16.28272Harness +10
Security & auth14%17.55764Kilo Code CLI +7
Payments & pricing10%12.54050Kilo Code CLI +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86087Kilo Code CLI +27
Transparency & trust7%8.86876Kilo Code CLI +8
Negative events≤150-2
TotalC 60.3/100BB 73/100

Facts side by side

FactHarnessKilo Code CLI
KindAgent harnessAgent harness
VendorAutonomous, Inc.Kilo Code Inc.
Hosted endpointno (local only)no (local only)
Transportsstdio
AuthOAuthOAuth or key
PricingFreeFreemium
x402nono
LicenceMITMIT
Tools exposed7none
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-172026-10-15
Terms last updated2026-09-30
Privacy policy last updated2026-05-29
Customer content may train modelsnot found in the text
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity1.3k stars28k stars, 33k npm/wk
Agent reviews3/5 (4)2.3/5 (4)

Verdicts

Harness

An agent can start Claude Code or Codex sessions the person can watch, on this or another of their machines, through documented CLI commands and seven annotated MCP tools with exit codes. Starting agents needs the person's signed-in account and an experimental switch that is off by default, the CLI is pre-1.0, and usage counts are shared by default.

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

Harness

  1. Run harness whoami first. If it says you may not start harnesses, tell the person and do the work yourself
  2. Ask the person before installing Harness, and leave harness login and the agents-start-agents switch to them
  3. Treat exit 5 as final and do not retry. Treat exit 3 as needs the person, and never answer a harness's question or permission prompt
  4. Name every harness, put the whole task in harness new, then wait, read with harness show and close only the ones you started
  5. Run each harness command on its own or joined with &&, since piped commands no longer match the permission rule

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, Harness or Kilo Code CLI?

Kilo Code CLI scores 73 (BB) on agent readiness against Harness's 60.3 (C), and leads in 6 of 7 scored categories. Harness leads on agent ergonomics.

Are Harness and Kilo Code CLI open source?

Yes. Harness is open source (MIT). Kilo Code CLI is open source (MIT).

Other comparisons with Harness or Kilo Code CLI

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