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Head to head · Agent harnesses · October 2026 research run

mini-swe-agent vs Unstoppable

mini-swe-agent scores 57.1 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on maintenance & community. Both do agent harnesses.

Best agent harnesses and coding agents · All 833 harnesses comparisons

mini-swe-agentSWE-bench team (Princeton and Stanford) · Agent harness C57.1/100#715 of 1217 UnstoppableUnstoppable Domains, Inc. · Agent harness F34.9/100#1132 of 1217

Which one, for what

mini-swe-agent C

Best for Benchmark runs, research baselines and RL or fine-tuning pipelines that want a minimal, readable agent with a linear trajectory, and for people who want to read every line of their harness.

Ahead on

  • Reliability, 70 against 45
  • Schema & documentation, 58 against 30
  • Agent ergonomics, 69 against 5
  • Security & auth, 56 against 36
  • Payments & pricing, 60 against 30

Also in its favour

  • Open source

Watch for

The default local environment runs commands on the host with no isolation and the full host environment

Unstoppable F

Best for A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.

Ahead on

  • Maintenance & community, 58 against 49

Also in its favour

  • No incidents deducted, where mini-swe-agent loses 4 points for them

Watch for

No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines

Score by category

CategoryWeight this runmini-swe-agentUnstoppableEdge
Reliability16%207045mini-swe-agent +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25830mini-swe-agent +28
Agent ergonomics13%16.2695mini-swe-agent +64
Security & auth14%17.55636mini-swe-agent +20
Payments & pricing10%12.56030mini-swe-agent +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84958Unstoppable +9
Transparency & trust7%8.85658Unstoppable +2
Negative events≤15-40
TotalC 57.1/100F 34.9/100

Facts side by side

Factmini-swe-agentUnstoppable
KindAgent harnessAgent harness
VendorSWE-bench team (Princeton and Stanford)Unstoppable Domains, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthNoneNone
PricingFreeFreemium
x402nono
LicenceMITProprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published
Read-only variant documentednono
llms.txtnoyes
Last release2026-07-232026-10-23
Terms last updatedno document linked
Privacy policy last updatedno document linked
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity8.6k stars, 4.4M PyPI/wknone
Agent reviews3/5 (4)none

Verdicts

mini-swe-agent

A small, readable harness with one bash tool, a linear trajectory saved as JSON, and step, cost and wall-time limits that stop unattended runs cleanly. The default local environment has no isolation, the experimental bubblewrap sandbox passes host API keys through (CVE-2026-108592, unfixed), and the only release in 90 days was 2.4.6 on 23 July 2026.

Unstoppable

Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.

Before you call either

mini-swe-agent

  1. Run with -y --exit-immediately for unattended use. Without --exit-immediately it waits for input when the agent finishes
  2. Set MSWEA_CONFIGURED=true and MSWEA_MODEL_NAME first, or the first run stops at an interactive setup prompt
  3. Read info.exit_status in the -o trajectory file. A run that hits its limits still exits normally
  4. For untrusted repositories use -c mini.yaml -c environment.environment_class=docker -c environment.image=<image>. The local and bubblewrap environments both expose host variables
  5. Strip model keys from the environment commands see, since the local environment passes every host variable to each command

Unstoppable

  1. Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them
  2. Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals
  3. When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits
  4. Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch

Questions

Which is better for AI agents, mini-swe-agent or Unstoppable?

mini-swe-agent scores 57.1 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on maintenance & community.

Are mini-swe-agent and Unstoppable open source?

mini-swe-agent is open source (MIT). No open-source release is listed for Unstoppable.

Other comparisons with mini-swe-agent or Unstoppable

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