Mistral Vibe: Smarter Agent Interaction with Message Queue and Cleaner Tool Output

New Features

Message Queue for Concurrent Input

Mistral Vibe v2.15.0 introduces a message queue that fundamentally changes how developers interact with a running agent. Previously, users had to wait for the agent to finish its current task before submitting new instructions. Now, developers can type follow-up prompts at any time while the agent is actively running. Those messages are held in a queue and delivered as soon as the agent becomes ready.

The queue supports a LIFO-style management workflow: pressing Escape clears the most recently queued message without interrupting the agent, while Ctrl+C stops the agent entirely and discards all queued messages. When the agent finishes, pressing Enter flushes the queue and delivers the next instruction immediately. This reduces idle time and makes long multi-step workflows significantly more fluid.

Collapsed Tool Output by Default

Tool result output is now collapsed by default in the session view. Previously, every tool invocation expanded its full output inline, which could make sessions difficult to scan when the agent was performing many operations in sequence. With this change, results are summarized in a compact form, and developers can expand individual results when they need to inspect the details.

Web search tool output in particular now shows a cleaner summary view with the URL and query visible at a glance, rather than dumping the full fetched content into the session stream.

Auto-Approval for Common Read-Only Shell Commands

Frequently used, low-risk shell commands including ls, cat, pwd, and similar read-only operations are now auto-approved without requiring a permission prompt. This reduces interruptions during common file exploration tasks, keeping the agent workflow unblocked for operations that pose no meaningful risk.

Stability and Bug Fixes

Mistral Vibe v2.15.0 also ships a set of targeted stability improvements:

• A UI blank screen issue that could occur during certain transitions has been resolved.
• Message content is now correctly preserved across compaction events, preventing data loss in long-running sessions.
• Non-UTF-8 input characters are now handled gracefully rather than causing crashes.
• A startup crash triggered when launching Mistral Vibe in an unowned folder has been fixed.
• Model refusal reasons are now surfaced explicitly in the UI, so developers can understand why a model declined a request rather than seeing a generic failure.