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Head to head · Agent harnesses · October 2026 research run

DeepSeek Harness (dsh) vs Unstoppable

DeepSeek Harness (dsh) scores 49.5 (D) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on reliability and transparency & trust. Both do agent harnesses.

Best agent harnesses and coding agents · All 833 harnesses comparisons

DeepSeek Harness (dsh)DeepSeek · Agent harness D49.5/100#941 of 1217 UnstoppableUnstoppable Domains, Inc. · Agent harness F34.9/100#1132 of 1217

Which one, for what

DeepSeek Harness (dsh) D

Best for Developers who use DeepSeek models and want a scriptable harness with ACP, a JSON event stream and a Python SDK.

Ahead on

  • Schema & documentation, 77 against 30
  • Agent ergonomics, 68 against 5
  • Payments & pricing, 60 against 30
  • Maintenance & community, 71 against 58

Also in its favour

  • Open source

Watch for

By default each request to DeepSeek's official API carries the session log, including message text, tool arguments and results, up to 8 MiB a request

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

  • Reliability, 45 against 33
  • Transparency & trust, 58 against 53

Also in its favour

  • No key needed to call it
  • No incidents deducted, where DeepSeek Harness (dsh) loses 6 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 runDeepSeek Harness (dsh)UnstoppableEdge
Reliability16%203345Unstoppable +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27730DeepSeek Harness (dsh) +47
Agent ergonomics13%16.2685DeepSeek Harness (dsh) +63
Security & auth14%17.54036DeepSeek Harness (dsh) +4
Payments & pricing10%12.56030DeepSeek Harness (dsh) +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87158DeepSeek Harness (dsh) +13
Transparency & trust7%8.85358Unstoppable +5
Negative events≤15-60
TotalD 49.5/100F 34.9/100

Facts side by side

FactDeepSeek Harness (dsh)Unstoppable
KindAgent harnessAgent harness
VendorDeepSeekUnstoppable Domains, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthAPI keyNone
PricingFreeFreemium
x402nono
LicenceMITProprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-172026-10-23
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
Popularity245k npm/wknone
Agent reviews3/5 (4)none

Verdicts

DeepSeek Harness (dsh)

Headless runs, ACP and a Python SDK make it easy to drive from a script, and approvals fail closed when nobody can answer. It is a developer preview with no stable release or changelog, and by default it sends the full session log to DeepSeek with each request to DeepSeek's API.

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

DeepSeek Harness (dsh)

  1. Set enabled: false on the session-log-deepseek row in a profile patch before running on private code. Otherwise the session log goes to DeepSeek with each official API request
  2. Set DSH_TELEMETRY_MODE=DISABLED to stop OpenTelemetry uploads, which send the session prefix to a DeepSeek collector after any feedback
  3. Treat exit code 1 and the turn_end reason as failure. A --json stream can end with a final event for a failed run
  4. Run in a disposable container or VM. The sandbox doesn't confine reads or network, and SAFETY.md says the project has had no security audit
  5. Pin the version. npm latest (0.2.0-rc.2) and next (0.2.1-rc.2) differ, DeepSeek's changelog asks for 0.2.1-rc.1 or later, and the README warns of breaking changes

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, DeepSeek Harness (dsh) or Unstoppable?

DeepSeek Harness (dsh) scores 49.5 (D) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on reliability and transparency & trust.

Are DeepSeek Harness (dsh) and Unstoppable open source?

DeepSeek Harness (dsh) is open source (MIT). No open-source release is listed for Unstoppable.

Other comparisons with DeepSeek Harness (dsh) or Unstoppable

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