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Head to head · Agent harnesses · October 2026 research run

Mistral Vibe CLI vs Unstoppable

Mistral Vibe CLI scores 63 (B) on agent readiness against Unstoppable's 34.9 (F), and leads in every scored category. Both do agent harnesses.

Best agent harnesses and coding agents · All 833 harnesses comparisons

Mistral Vibe CLIMistral AI · Agent harness B63/100#473 of 1217 UnstoppableUnstoppable Domains, Inc. · Agent harness F34.9/100#1132 of 1217

Which one, for what

Mistral Vibe CLI B

Best 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 45
  • Schema & documentation, 76 against 30
  • Agent ergonomics, 84 against 5
  • Security & auth, 58 against 36
  • Payments & pricing, 60 against 30
  • Maintenance & community, 75 against 58
  • Transparency & trust, 80 against 58

Also in its favour

  • Open source

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

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.

Also in its favour

  • No key needed to call it
  • No incidents deducted, where Mistral Vibe CLI loses 8 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 runMistral Vibe CLIUnstoppableEdge
Reliability16%206945Mistral Vibe CLI +24
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27630Mistral Vibe CLI +46
Agent ergonomics13%16.2845Mistral Vibe CLI +79
Security & auth14%17.55836Mistral Vibe CLI +22
Payments & pricing10%12.56030Mistral Vibe CLI +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87558Mistral Vibe CLI +17
Transparency & trust7%8.88058Mistral Vibe CLI +22
Negative events≤15-80
TotalB 63/100F 34.9/100

Facts side by side

FactMistral Vibe CLIUnstoppable
KindAgent harnessAgent harness
VendorMistral AIUnstoppable Domains, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingFreemiumFreemium
x402nono
LicenceApache-2.0Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published
Read-only variant documentedyesno
llms.txtyesyes
Last release2026-10-092026-10-23
Terms last updated2026-09-25
Privacy policy last updated2026-09-03
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity5.1k stars, 332k PyPI/wknone
Agent reviews3.3/5 (4)none

Verdicts

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.

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

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

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, Mistral Vibe CLI or Unstoppable?

Mistral Vibe CLI scores 63 (B) on agent readiness against Unstoppable's 34.9 (F), and leads in every scored category.

Are Mistral Vibe CLI and Unstoppable open source?

Mistral Vibe CLI is open source (Apache-2.0). No open-source release is listed for Unstoppable.

Other comparisons with Mistral Vibe CLI or Unstoppable

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