Mistral Vibe v3.0.0 Release Notes — What's New

Added

The app-server reports each model's compaction threshold, so a client can show how full a session's context is before it compacts.
Desktop can import projects and sessions from another coding agent during onboarding.
Rust CLI: /leanstall and /unleanstall install and uninstall the Lean agent.
With experimental_enable_model_catalog on, the model list includes Mistral's curated models, and your config can still override their settings.
Rust CLI: Tool approval options, /thinking levels, /resume sessions and /log-level rows and badges can be clicked.
Rust CLI: Option lists show a faint hover background under the mouse.
With a "shared only" API key, /mcp blocks connectors that need your login and tells you to run vibe --setup.
Rust CLI: /branch forks the current conversation into a new resumable session.
The agent can now wait for your next message or for background work to finish, instead of repeatedly checking.
Rust CLI: Debug console for live session logs, opened with /debug or Ctrl+.
Rust CLI: Report activity, approvals, questions, completion, and failure with session titles and error messages through the OSC 7501 Program Status Protocol.
/status shows the credential source in use and the shadowed sources
Admin-enforceable enable_mcp flag to block all user-facing MCP server operations (add, remove, toggle, login, logout, tool registration), including plugin-provided MCP servers, via managed config.

Changed

read_file shows a file's line endings as they are on disk, like shell commands do
write_file writes new files with the line endings it is given, also on Windows
The app server now shows up as vibe-app-server instead of python3 in Activity Monitor, ps, and top.
Rust CLI: dragging a scrollbar moves smoothly in fine steps on terminals that report the mouse in pixels, such as Ghostty, kitty and WezTerm.
displayed_workdir, context_warnings and raise_on_compaction_failure are deprecated: they remain accepted in existing configs but have no effect on Unified execution.
Rust CLI: The welcome banner starts at the top left, with the conversation and what's new flowing below it while queued messages stay at the bottom.
Rust CLI: One click picks an option whose only action is choosing it (tool approvals, questions, /theme, /plugins, subagents, config choices, the remote project picker, MCP or connector sign-in); options with several actions (/model, /thinking, /resume, /mcp, /config) highlight on the first click and confirm on the second.
Rust CLI: The highlighted free-text answer spans the full row, and clicking its number unticks it in multi-select questions.
Rust CLI: Colored text on a highlighted row takes the row's text color.
Rust CLI: headless mode (-p) now follows the Python CLI's run contract, with turn, token, price and time limits, graceful stops, and a JSON run export whose exit code reports the outcome.
Pressing Esc twice to clear the input or open rewind now accepts a slower second press.
Rust CLI: The welcome banner is more compact: the cat sits beside the version, model and plan, and the model, connector, MCP server, skill and hook counts are gone.
The Vibe VS Code extension (ACP surface) now gets the same background session titles as CLI and Desktop; the sessions list shows the summarized title instead of the message preview
The agent's subagent tools are renamed from subagent.* to agents.*, and sessions saved with the old names still resume.
Plugins can no longer use the agents, agent or collaboration tool namespaces, which are reserved for built-in agent tools.
A programmatic tool call now stops after 60 seconds in total, and a single sleep inside it is capped at 30 seconds.
Faster session startup when no MCP server is used.
Vibe now requires Python 3.14 or newer (previously 3.12)
Outbound HTTPS connections now validate certificate chains with stricter RFC 5280 rules; a private CA missing SKID/AKID or KeyUsage extensions may be rejected — set enable_system_trust_store or use a compliant CA
Vibe Code: the retry notice keeps counting the seconds past the planned retry instead of freezing until the provider answers, and screen readers get paced progress announcements
vibe -p JSON and streaming output mark each completed assistant message and reasoning with an outcome: committed, or discarded with its cause.
The Rust TUI detects terminal activity reporting support to avoid duplicate title indicators and notification bells.
Faster session startup, most noticeably on Windows and in repositories with many branches or tags.

Fixed

Desktop local Code holds queued messages while editing without a timeout; Save and Cancel let the queue continue unless paused.
Disconnecting during an unfinished queued edit keeps the original message and pauses the queue until Resume.
In Vibe Desktop, the sidebar session list now only reorders when a new conversation turn starts, instead of jumping around on queued messages, steers, and permission answers.
On Windows, the shell tools no longer auto-approve commands that use a mid-word #, an escaped quote, or PowerShell quoting to hide part of the command from the approval check.
Multi-line edits to CRLF files no longer fail, and edited lines keep the file's line endings
The Unified Harness no longer converts a CRLF file to LF when it overwrites it
Sessions containing a large image no longer fail with a compaction error when the context is nowhere near full.
Listing saved sessions (/resume and the Desktop session sidebar) is several times faster when you have thousands of sessions.
Rust CLI: scrolling with the wheel or a scrollbar no longer stutters or trails the pointer when the view is slow to redraw.
Rust CLI: the smart approve mode now shows its warning-colored input border and cycles with Shift+Tab, matching the Python CLI.
Automatic context compaction now shows a progress row in the transcript that settles to done, failed, or interrupted.
The current input line no longer blinks with the cursor in the textual-dark theme.
A suspended Rust CLI now dies when its terminal closes or it is killed, instead of lingering forever.
Resuming a suspended session with shell bg twice no longer exits the CLI with an interrupted-syscall error.
Rust CLI: Fix shell MCP commands to support named URLs, static authentication, stdio servers, and timeout options.
Rust CLI: /mcp add, login, logout, and status errors now show the server's reason.
Session meta.json records the active model and provider model name for Unified Harness sessions.
Subagents now see connector tools in sessions whose connector catalog finishes loading after the session starts, and connector changes applied mid-session reach subagents spawned afterwards.
Starting, resuming, or continuing another session no longer resets the shared host's resolved connector catalog to its start-time placeholder, so a session promoted after that keeps its connector grants.
Rust CLI: config validation warnings that appear mid-session now surface as a toast, not only at startup.
Very large tool outputs are truncated in the transcript, so sessions containing them can be previewed and resumed again.
Rust CLI: A session preview that fails to load no longer closes the resume picker or makes the CLI unusable.
Rust CLI: The /rename usage tip and /mcp add --help show their <...> placeholders instead of dropping them.
A locked or unapproved macOS Keychain no longer hangs vibe -p forever: the read gives up after 60s and the error says the Keychain could not be read instead of reporting a missing key.
Rust CLI: -p runs announce on stderr when the API key comes from the keyring, fail if startup stalls, and print the server's error instead of a bare session/start.
When a third-party model declines a request, Vibe now says so instead of recording an empty reply.
Sessions where a third-party model returned an empty reply no longer fail every later message with a 400 error.

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