mistral-vibe crash with incompatible pydantic-core version

[nikaro]

brew config AND brew doctor output OR brew gist-logs <formula> link

HOMEBREW_VERSION: 5.1.7-104-gda08bbf
ORIGIN: https://github.com/Homebrew/brew
HEAD: da08bbf93411e2b28107753d5d1515090a399e3d
Last commit: 2 hours ago
Branch: main
Core tap HEAD: 84c0111aba64e5ebf4e50020ae9380a76f38a532
Core tap last commit: 70 minutes ago
Core tap JSON: 26 Apr 06:40 UTC
Core cask tap JSON: 26 Apr 06:40 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DOWNLOAD_CONCURRENCY: 20
HOMEBREW_EDITOR: hx
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 10
HOMEBREW_NO_AUTO_UPDATE: set
HOMEBREW_NO_ENV_HINTS: set
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 4.0.3 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/4.0.3/bin/ruby
CPU: deca-core 64-bit arm_donan
Clang: 21.0.0 build 2100
Git: 2.54.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 26.4.1-arm64
CLT: 26.4.1.0.1775747724
Xcode: N/A
Rosetta 2: false



Your system is ready to brew.

Verification

• My brew doctor output says Your system is ready to brew. and am still able to reproduce my issue.
• I ran brew update and am still able to reproduce my issue.
• I have resolved all warnings from brew doctor and that did not fix my problem.
• I searched for recent similar issues at https://github.com/Homebrew/homebrew-core/issues?q=is%3Aissue and found no duplicates.
• My issue is not about a failure to build a formula from source.

What were you trying to do (and why)?

Using mistral-vibe.

What happened (include all command output)?

> vibe
Traceback (most recent call last):
  File "/opt/homebrew/bin/vibe", line 3, in <module>
    from vibe.cli.entrypoint import main
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/cli/entrypoint.py", line 11, in <module>
    from vibe.core.agents.models import BuiltinAgentName
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/agents/__init__.py", line 3, in <module>
    from vibe.core.agents.manager import AgentManager
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/agents/manager.py", line 7, in <module>
    from vibe.core.agents.models import (
    ...<4 lines>...
    )
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/agents/models.py", line 9, in <module>
    from vibe.core.paths import PLANS_DIR
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/paths/__init__.py", line 3, in <module>
    from vibe.core.paths._local_config_walk import (
    ...<3 lines>...
    )
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/paths/_local_config_walk.py", line 10, in <module>
    from vibe.core.autocompletion.file_indexer.ignore_rules import WALK_SKIP_DIR_NAMES
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/autocompletion/file_indexer/__init__.py", line 3, in <module>
    from vibe.core.autocompletion.file_indexer.indexer import FileIndexer
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/autocompletion/file_indexer/indexer.py", line 10, in <module>
    from vibe.core.autocompletion.file_indexer.ignore_rules import IgnoreRules
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/autocompletion/file_indexer/ignore_rules.py", line 7, in <module>
    from vibe.core.utils.io import read_safe
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/utils/__init__.py", line 15, in <module>
    from vibe.core.utils.http import get_server_url_from_api_base, get_user_agent
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/utils/http.py", line 6, in <module>
    from vibe.core.types import Backend
  File "/opt/homebrew/Cellar/mistral-vibe/2.8.1/libexec/lib/python3.14/site-packages/vibe/core/types.py", line 18, in <module>
    from pydantic import (
    ...<7 lines>...
    )
  File "/opt/homebrew/opt/pydantic/lib/python3.14/site-packages/pydantic/__init__.py", line 8, in <module>
    _ensure_pydantic_core_version()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/opt/homebrew/opt/pydantic/lib/python3.14/site-packages/pydantic/version.py", line 94, in _ensure_pydantic_core_version
    raise SystemError(
    ...<3 lines>...
    )
SystemError: The installed pydantic-core version (2.46.3) is incompatible with the current pydantic version, which requires 2.41.5. If you encounter this error, make sure that you haven't upgraded pydantic-core manually.

What did you expect to happen?

mistral-vibe starting without error

Step-by-step reproduction instructions (by running brew commands)

brew install mistral-vibe
vibe

[nikaro]

FTR: mistralai/mistral-vibe#631

Overall i am not sure this is good idea to rely on a "shared" packaged python lib (like pydantic-core) for python apps that use lockfiles and thus may diverge between the version of the "locked" one and the "shared" one.

[daeho-ro]

Can you upgrade pydantic and try again?

brew update
brew upgrade pydantic
brew reinstall mistral-vibe

[nikaro]

Hello @daeho-ro

Still the same (i was already on the latest version of pydantic):

⏺ ~ > brew update --force
==> Updating Homebrew...
Already up-to-date.
⏺ ~ > brew upgrade pydantic
Warning: pydantic 2.13.3 already installed
⏺ ~ > brew reinstall mistral-vibe
==> Fetching downloads for: mistral-vibe
✔︎ Bottle Manifest mistral-vibe (2.8.1)                                                                                                                    Downloaded   29.8KB/ 29.8KB
✔︎ Bottle mistral-vibe (2.8.1)                                                                                                                             Downloaded    7.9MB/  7.9MB
==> Reinstalling mistral-vibe
==> Pouring mistral-vibe--2.8.1.arm64_tahoe.bottle.tar.gz
🍺  /opt/homebrew/Cellar/mistral-vibe/2.8.1: 4,301 files, 35.6MB
==> Running `brew cleanup mistral-vibe`...
⏺ ~ > vibe -h
Traceback (most recent call last):
  File "/opt/homebrew/bin/vibe", line 3, in <module>
    from vibe.cli.entrypoint import main
[...]

[daeho-ro]

Can I see your python3.14 -m pip list? Did you install something manually by pip?

[nikaro]

Sure.

⏺ ~ > python3.14 -m pip list
Package           Version
----------------- ---------
annotated-types   0.7.0
certifi           2026.4.22
cffi              2.0.0
cryptography      47.0.0
pip               26.0.1
pycparser         3.0
pydantic          2.13.3
pydantic_core     2.46.3
rpds-py           0.30.0
typing_extensions 4.15.0
typing-inspection 0.4.2
wheel             0.46.3

Did you install something manually by pip?

Nope.

[nikaro]

Some more maybe useful information:

⏺ ~ > python3.14 -m pip show pydantic-core
Name: pydantic_core
Version: 2.46.3
Summary: Core functionality for Pydantic validation and serialization
Home-page: https://github.com/pydantic/pydantic
Author:
Author-email: Samuel Colvin <s@muelcolvin.com>, Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>, David Montague <david@pydantic.dev>, David Hewitt <mail@davidhewitt.dev>, Sydney Runkle <sydneymarierunkle@gmail.com>, Victorien Plot <contact@vctrn.dev>
License-Expression: MIT
Location: /opt/homebrew/lib/python3.14/site-packages
Requires: typing-extensions
Required-by: pydantic

⏺ ~ > python3.14 -m pip show pydantic
Name: pydantic
Version: 2.13.3
Summary: Data validation using Python type hints
Home-page: https://github.com/pydantic/pydantic
Author:
Author-email: Samuel Colvin <s@muelcolvin.com>, Eric Jolibois <em.jolibois@gmail.com>, Hasan Ramezani <hasan.r67@gmail.com>, Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>, Terrence Dorsey <terry@pydantic.dev>, David Montague <david@pydantic.dev>, Serge Matveenko <lig@countzero.co>, Marcelo Trylesinski <marcelotryle@gmail.com>, Sydney Runkle <sydneymarierunkle@gmail.com>, David Hewitt <mail@davidhewitt.dev>, Alex Hall <alex.mojaki@gmail.com>, Victorien Plot <contact@vctrn.dev>
License-Expression: MIT
Location: /opt/homebrew/lib/python3.14/site-packages
Requires: annotated-types, pydantic-core, typing-extensions, typing-inspection
Required-by: