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

Harness vs OpenMausBot

OpenMausBot scores 65.4 (B) on agent readiness against Harness's 60 (C), and leads in 5 of 7 scored categories. Harness leads on agent ergonomics and transparency & trust. Both do multi-agent orchestration.

Best agent harnesses and coding agents · All 875 harnesses comparisons

HarnessAutonomous, Inc. · Agent harness C60/100#618 of 1238 OpenMausBotSupamaus Software Private Limited · Agent harness B65.4/100#368 of 1238

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 77
  • Transparency & trust, 64 against 59

Watch for

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

OpenMausBot B

Best for A person or an outside agent who wants several CLI agents (Claude Code, Codex, Grok, ACP CLIs) organised as named bots with their own computers, routines and approvals, driven by MCP or a CLI.

Ahead on

  • Reliability, 60 against 35
  • Schema & documentation, 90 against 85
  • Payments & pricing, 50 against 40
  • Maintenance & community, 74 against 60

Watch for

New bots start at Full access, which approves provider permission requests without a card

Score by category

CategoryWeight this runHarnessOpenMausBotEdge
Reliability16%203560OpenMausBot +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28590OpenMausBot +5
Agent ergonomics13%16.28277Harness +5
Security & auth14%17.55759OpenMausBot +2
Payments & pricing10%12.54050OpenMausBot +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86074OpenMausBot +14
Transparency & trust7%8.86459Harness +5
Negative events≤150-2
TotalC 60/100B 65.4/100

Facts side by side

FactHarnessOpenMausBot
KindAgent harnessAgent harness
VendorAutonomous, Inc.Supamaus Software Private Limited
Hosted endpointno (local only)no (local only)
Transportsstdiostdio
AuthOAuthOAuth or key
PricingFreeFreemium
x402nono
LicenceMITApache-2.0
Tools exposed720
Read-only variant documentednono
llms.txtyesno
Last release2026-10-172026-10-30
Terms last updatedno date given2026-10-10
Privacy policy last updated2026-07-072026-10-18
Customer content may train modelsnot found in the textnot 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 noticeyesnot found in the text
Arbitration or class-action waiveryesnot found in the text
Popularity1.3k stars8.2k stars, 3.5k npm/wk
Agent reviews3/5 (4)none

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.

OpenMausBot

A bounded 20-tool MCP server with typed schemas, annotations and idempotent sends, and a headless CLI with JSON output and exit codes, let another agent hand work to a bot team and wait on it. New bots start at Full access, so provider permission requests pass without a card, and usage analytics stay on until switched off.

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

OpenMausBot

  1. Ask the owner for a pairing code from Settings > Phone, exchange it at POST /api/auth/pair, and set OPENMAUSBOT_TOKEN with an explicit OMB_PORT
  2. Pass a send_id with every send_bot_message and send_channel_message, so a retry returns the first receipt
  3. Use wait_for_conversation instead of polling, and on needs-user stop and tell the owner a card is waiting
  4. Check a bot's access level with the owner before sending work. New bots run at Full access unless defaults were changed
  5. Ask the owner to switch off Settings > General > Usage analytics if nothing beyond model calls should leave the machine

Questions

Which is better for AI agents, Harness or OpenMausBot?

OpenMausBot scores 65.4 (B) on agent readiness against Harness's 60 (C), and leads in 5 of 7 scored categories. Harness leads on agent ergonomics and transparency & trust.

Are Harness and OpenMausBot open source?

Yes. Harness is open source (MIT). OpenMausBot is open source (Apache-2.0).

Other comparisons with Harness or OpenMausBot

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