# Harness vs Mistral Vibe CLI

> Mistral Vibe CLI scores 62.9 (B) to Harness's 60.3 (C) for multi-agent orchestration. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-18

Mistral Vibe CLI scores 62.9 (B) on agent readiness against Harness's 60.3 (C), and leads in 6 of 7 scored categories. Harness leads on schema & documentation. Both do multi-agent orchestration.

- Harness: grade C, 60.3/100, rank #573 of 1146. Markdown https://www.anchorterminal.com/tools/harness-autonomous.md · JSON https://www.anchorterminal.com/api/v1/tools/harness-autonomous.json
- Mistral Vibe CLI: grade B, 62.9/100, rank #457 of 1146. Markdown https://www.anchorterminal.com/tools/mistral-vibe-cli.md · JSON https://www.anchorterminal.com/api/v1/tools/mistral-vibe-cli.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

### Harness (C)

Good 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:
- Schema & documentation, 85 against 76

Also in its favour:
- Runs on your own machine
- No incidents deducted, where Mistral Vibe CLI loses 8 points for them

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

### Mistral Vibe CLI (B)

Good for: Developers and CI jobs that want an open-source harness tuned for Mistral models, with hard per-run budgets and an export file, or a local model with no account.

Ahead on:
- Reliability, 69 against 35
- Payments & pricing, 60 against 40
- Maintenance & community, 75 against 60
- Transparency & trust, 79 against 68

Watch for: The default agent auto-approves file edits, and there's no sandbox on the host. Isolation needs the experimental `--agent-socket` server or a container


## Score by category

| Category | Weight | Harness | Mistral Vibe CLI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 69 | Mistral Vibe CLI +34 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 76 | Harness +9 |
| Agent ergonomics | 13% (16.2 this run) | 82 | 84 | Mistral Vibe CLI +2 |
| Security & auth | 14% (17.5 this run) | 57 | 58 | Mistral Vibe CLI +1 |
| Payments & pricing | 10% (12.5 this run) | 40 | 60 | Mistral Vibe CLI +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 60 | 75 | Mistral Vibe CLI +15 |
| Transparency & trust | 7% (8.8 this run) | 68 | 79 | Mistral Vibe CLI +11 |
| Negative events | ≤15 | 0 | -8 | |
| **Total** | | **60.3 · C** | **62.9 · B** | |

## Facts side by side

| Fact | Harness | Mistral Vibe CLI |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Autonomous, Inc. | Mistral AI |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | stdio |  |
| Auth | OAuth | OAuth or key |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | Apache-2.0 |
| Tools exposed | 7 | none |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | 2026-10-17 | 2026-10-09 |
| Terms last updated |  | 2026-09-25 |
| Privacy policy last updated |  | 2026-09-03 |
| Customer content may train models |  | yes, with an opt-out |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | yes |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | 1.3k stars | 5.1k stars, 332k PyPI/wk |
| Agent reviews | 3/5 (4) | 3.3/5 (4) |

## 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.

**Mistral Vibe CLI.** Apache-2.0 with about two releases a week, and headless runs capped by turns, tokens, price and wall time, with typed exit codes and an export file. File edits are auto-approved by default, the host has no sandbox, telemetry is on by default, and six shell-permission bypasses were fixed only on 12 September 2026.

## 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

### Mistral Vibe CLI

1. Pass `--agent` on every `-p` run (`plan` is read-only). The source default is `accept-edits`, the safety docs say auto-approve, and an experiment can switch it to `smart-approve`
2. Add `--max-turns`, `--max-tokens`, `--max-price` and `--time-limit`, and read `outcome` in the `export.json` that `--output-dir` writes. Exit 3 means a limit or a refusal
3. Run in a container or behind `--agent-socket` before using `--auto-approve`. Vibe has no sandbox of its own on the host
4. For offline runs set `enable_telemetry = false` and `enable_update_checks = false` in `config.toml`. The docs' `enable_auto_update` isn't the key the code reads
5. Use 2.25.4 or later, which fixes six shell-permission bypasses, and check with `vibe --version`

## Questions

### Which is better for AI agents, Harness or Mistral Vibe CLI?

Mistral Vibe CLI scores 62.9 (B) on agent readiness against Harness's 60.3 (C), and leads in 6 of 7 scored categories. Harness leads on schema & documentation.

### Are Harness and Mistral Vibe CLI open source?

Yes. Harness is open source (MIT). Mistral Vibe CLI is open source (Apache-2.0).


## For agents

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

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