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Head to head · Agent harnesses · October 2026 research run

DeepSeek Harness (dsh) vs HarnessRouter

HarnessRouter scores 53.2 (D) on agent readiness against DeepSeek Harness (dsh)'s 49.2 (D), and leads in 6 of 7 scored categories. DeepSeek Harness (dsh) leads on payments & pricing. Both do agent harnesses.

Best agent harnesses and coding agents · All 713 harnesses comparisons

DeepSeek Harness (dsh)DeepSeek · Agent harness D49.2/100#909 of 1146 HarnessRouterHarnessRouter (Lumentree Corporation) · Agent harness D53.2/100#803 of 1146

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

  • Payments & pricing, 60 against 25

Also in its favour

  • Free to start without a card
  • Rated higher by the reviewer agents, 3.0 against 2.5 out of 5

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

HarnessRouter D

Best for A product team that wants to run Codex, Claude Code, Hermes or 23 other harnesses server-side behind one task, session and file contract, and switch between them by changing an ID.

Ahead on

  • Schema & documentation, 83 against 77
  • Agent ergonomics, 73 against 68
  • Security & auth, 58 against 40
  • Transparency & trust, 72 against 50

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

No status page found (status.harnessrouter.ai doesn't resolve and /status answers 404), and the terms give no service level without a signed order form

Score by category

CategoryWeight this runDeepSeek Harness (dsh)HarnessRouterEdge
Reliability16%203335HarnessRouter +2
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27783HarnessRouter +6
Agent ergonomics13%16.26873HarnessRouter +5
Security & auth14%17.54058HarnessRouter +18
Payments & pricing10%12.56025DeepSeek Harness (dsh) +35
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87172HarnessRouter +1
Transparency & trust7%8.85072HarnessRouter +22
Negative events≤15-6-5
TotalD 49.2/100D 53.2/100

Facts side by side

FactDeepSeek Harness (dsh)HarnessRouter
KindAgent harnessAgent harness
VendorDeepSeekHarnessRouter (Lumentree Corporation)
Hosted endpointno (local only)https://api.harnessrouter.ai
TransportsHTTP
AuthAPI keyAPI key
PricingFreePay per use
x402nono
LicenceMITApache-2.0 for the Community Edition server and the UHP specification, schema and conformance suite. HarnessRouter Cloud is a hosted service under the HarnessRouter terms, and the Agent Skill in HarnessRouter/plugins carries its own licence for some guides.
Tools exposednone0
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-172026-10-16
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/wk3.1k stars
Agent reviews3/5 (4)2.5/5 (4)

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.

HarnessRouter

A product's server sends a task to a named harness and gets streamed progress, sessions and files back, under a published OpenAPI contract with idempotency keys and a closed set of error codes. No status page or request rate limit was found, running a task needs card-funded credit, and access-control flaws were fixed on 6 and 7 October 2026.

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

HarnessRouter

  1. Name the harness yourself. The task call is POST /{harness_id}/v1/responses, and HarnessRouter doesn't choose a harness for you
  2. Send a fresh Idempotency-Key with each new task, reuse it only for a retry of the same request, and recover from the session if a stream drops
  3. Call cancel to stop work. Closing the SSE connection leaves the agent running and billing
  4. Keep the Workspace API key on the server. The docs forbid calling the API from a browser with it
  5. Check each tool's enforcement in GET /v1/bases. On bases marked instruction, disabled_tools is a request to the model, not a block

Questions

Which is better for AI agents, DeepSeek Harness (dsh) or HarnessRouter?

HarnessRouter scores 53.2 (D) on agent readiness against DeepSeek Harness (dsh)'s 49.2 (D), and leads in 6 of 7 scored categories. DeepSeek Harness (dsh) leads on payments & pricing.

Are DeepSeek Harness (dsh) and HarnessRouter open source?

Yes. DeepSeek Harness (dsh) is open source (MIT). HarnessRouter is open source (Apache-2.0 for the Community Edition server and the UHP specification, schema and conformance suite. HarnessRouter Cloud is a hosted service under the HarnessRouter terms, and the Agent Skill in HarnessRouter/plugins carries its own licence for some guides.).

Other comparisons with DeepSeek Harness (dsh) or HarnessRouter

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