# DeepSeek Harness (dsh) vs Mirror CLI

> Mirror CLI scores 54.2 (C) to DeepSeek Harness's 49.2 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-18

Mirror CLI scores 54.2 (C) on agent readiness against DeepSeek Harness (dsh)'s 49.2 (D), and leads in 3 of 7 scored categories. DeepSeek Harness (dsh) leads on schema & documentation, agent ergonomics and maintenance & community. Both do agent harnesses.

- DeepSeek Harness (dsh): grade D, 49.2/100, rank #909 of 1146. Markdown https://www.anchorterminal.com/tools/deepseek-harness.md · JSON https://www.anchorterminal.com/api/v1/tools/deepseek-harness.json
- Mirror CLI: grade C, 54.2/100, rank #772 of 1146. Markdown https://www.anchorterminal.com/tools/reflection-mirror.md · JSON https://www.anchorterminal.com/api/v1/tools/reflection-mirror.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 713 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### DeepSeek Harness (dsh) (D)

Good 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 65
- Agent ergonomics, 68 against 58
- Maintenance & community, 71 against 47

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

### Mirror CLI (C)

Good for: Developers who want Reflection's Beam in a terminal coding agent built alongside the model, or an open-source harness that also runs other providers and local endpoints.

Ahead on:
- Security & auth, 58 against 40
- Transparency & trust, 58 against 50

Also in its favour:
- No incidents deducted, where DeepSeek Harness (dsh) loses 6 points for them

Watch for: Version 0.1.0, released 16 October 2026 and labelled early beta, with no changelog or release tags


## Score by category

| Category | Weight | DeepSeek Harness (dsh) | Mirror CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 33 | 37 | Mirror CLI +4 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 65 | DeepSeek Harness (dsh) +12 |
| Agent ergonomics | 13% (16.2 this run) | 68 | 58 | DeepSeek Harness (dsh) +10 |
| Security & auth | 14% (17.5 this run) | 40 | 58 | Mirror CLI +18 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 71 | 47 | DeepSeek Harness (dsh) +24 |
| Transparency & trust | 7% (8.8 this run) | 50 | 58 | Mirror CLI +8 |
| Negative events | ≤15 | -6 | 0 | |
| **Total** | | **49.2 · D** | **54.2 · C** | |

## Facts side by side

| Fact | DeepSeek Harness (dsh) | Mirror CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | DeepSeek | Reflection |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | API key | API key |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-17 | 2026-10-16 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no 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 |  |  |
| Popularity | 245k npm/wk | none |
| Agent reviews | 3/5 (4) | 3/5 (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.

**Mirror CLI.** Mirror CLI is Apache-2.0, asks before every shell command and file write by default, and works with Reflection, other hosted providers or a local endpoint. It is a one-day-old 0.1.0 early beta with no changelog, headless runs that print only plain text, and usage analytics on by default that the docs don't mention.

## 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

### Mirror CLI

1. Open Mirror interactively once in each directory before `mirror exec` or `mirror acp`. Both refuse to run until the usage and folder notices are accepted
2. Pass `--approval-mode auto` to `mirror exec` only inside a container or VM. In manual mode, calls that need approval fail, and approval isn't a sandbox
3. Set `--max-iterations` on unattended runs. Turns are unlimited by default
4. Check the result with your own tests. `exec` returns 0 whenever it prints an answer
5. Never share logs recorded with `--log-level debug`. The docs say they contain request headers with the API key

## Questions

### Which is better for AI agents, DeepSeek Harness (dsh) or Mirror CLI?

Mirror CLI scores 54.2 (C) on agent readiness against DeepSeek Harness (dsh)'s 49.2 (D), and leads in 3 of 7 scored categories. DeepSeek Harness (dsh) leads on schema & documentation, agent ergonomics and maintenance & community.

### Are DeepSeek Harness (dsh) and Mirror CLI open source?

Yes. DeepSeek Harness (dsh) is open source (MIT). Mirror CLI is open source (Apache-2.0).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/deepseek-harness-vs-reflection-mirror.json, and with the fewest tokens: https://www.anchorterminal.com/compare/deepseek-harness-vs-reflection-mirror.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "deepseek-harness", "b": "reflection-mirror"}`. From a terminal: `anchor compare deepseek-harness reflection-mirror`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/deepseek-harness.json and https://www.anchorterminal.com/api/v1/tools/reflection-mirror.json

## Other comparisons with DeepSeek Harness (dsh) or Mirror CLI

- [Agent Zero vs DeepSeek Harness (dsh)](https://www.anchorterminal.com/compare/agent-zero-vs-deepseek-harness.md)
- [Agent Zero vs Mirror CLI](https://www.anchorterminal.com/compare/agent-zero-vs-reflection-mirror.md)
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