feat(adapters): add Mistral Vibe profile + vibe-hooks-toml dialect

[ayhid]

Drafted per the Discord thread with @jeremy — flagging early rather than dropping it unannounced, and happy to close it if the pre-1.0 stance on new CLIs means "not yet".

What

Adds mistral-vibe (alias vibe), driving Mistral's vibe CLI through the existing generic tmux + hook-signal transport.

It is not the usual zero-Python profile add. Vibe is the first CLI whose hook config is not JSON: .vibe/hooks.toml is a flat hooks = [...] array of tables whose entries name their own event in a type field rather than being keyed by it. So this also adds a sixth dialect, vibe-hooks-toml.

Why it touches install.py

Hook-config I/O was JSON-shaped at four read sites and three write sites. Those now go through a dialect-aware load_hook_config / dump_hook_config seam; every JSON dialect emits byte-identical output, so the existing merge tests characterize the refactor.

The TOML writer is hand-rolled (~25 lines) rather than a new dependency — tomlkit ships only with the [tui] extra, and vibe's HookConfig schema is closed and entirely scalar. It raises ProfileError on a non-scalar rather than emitting something vibe would misparse. Known trade-off, documented in the docstring: re-emitting drops comments in the user's hooks.toml, which only happens when merge_hooks reports changed.

Profile facts, pinned against vibe 2.23.2

• post_agent is the only turn-end event — no SessionStart / SessionEnd / PreCompact analogue — and it fires per response turn, so the profile ships stop_without_result_nudges = 5, the same reason copilot's agentStop needed it.
• --trust is load-bearing. Vibe reads project hooks only in a trusted directory; without it no Stop ever arrives and every session reads as a timeout. Trust is per-invocation rather than an exact-path store, so isolation = "worktree" keeps working — vibe does not inherit antigravity's isolation = "none" restriction.
• Vibe has no --model flag; the model comes from VIBE_ACTIVE_MODEL or vibe's own config, so [adapter] model must stay empty. generic.py only appends model_flag when a model is set, so this is a documented limitation, not a crash.
• Payload keys are snake_case (session_id, transcript_path, cwd), so bmad_loop_hook.py is unchanged.

Testing

• Vibe's own pydantic hook loader parses the emitted file with zero issues, including a command carrying quotes and backslashes and a pre-existing user hook alongside ours.
• init → validate → re-init on a scratch project: registers, detects, idempotent, and a hand-added decoy user hook survives untouched.
• New tests: merge_hooks vibe cases (shape, idempotency, user-hook preservation, the [BUG] bmad-loop validate and probe fail to recognize registered hooks for antigravity adapter #159 marker guarantee, malformed-shape refusal), a tomllib round-trip over the emitter, install_into end-to-end. Added mistral-vibe to the existing dialect parametrizations in test_probe.py and the profile assertions in test_profile.py.
• Ablation-checked both "is refused" tests — deleting each guard makes its test fail.
• Full suite passes (3 pre-existing macOS-only failures around non-UTF-8 filenames, unrelated).

Known gaps

• usage_parser = "none" is pending, not final. The live --probe is blocked on vibe's one-time interactive onboarding wizard, so the hook payload and the token schema in ~/.vibe/logs/session/*/messages.jsonl are inferred from reading vibe's source rather than observed. I'll re-probe after vibe --setup and follow up; if messages.jsonl carries usage, the parser is a separate small PR.
• Subagent turn-ends. Vibe's subagents inherit the parent's hook config and fire post_agent with a non-empty transcript_path, so copilot's subagent_stop_without_transcript mechanism won't filter them (they carry a non-null parent_session_id instead). I've left this to artifact-gating plus the raised nudge floor rather than adding a profile knob unilaterally — happy to add one if you'd rather, but it seemed like your call.

Marked draft since the two above are open and the pre-1.0 stance on new CLIs is yours to set.

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 562752ac-d98b-409e-b044-2af18cc1bea4

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}