napari-plugin-engine
napari plugin engine, fork of pluggy
Decision gist · record as of 2026-08-14
No. The package is officially deprecated and abandoned; the napari team explicitly recommends npe2 for all new plugins and existing plugins to migrate. Install only if you are maintaining legacy code that cannot yet move to npe2. For new development, use npe2 instead.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.6 or later; package is deprecated and no longer maintained.
- Low install friction with a single runtime dependency (importlib-metadata).
- However, the package is abandoned—the repository is archived and officially deprecated in favor of npe2, with no active maintenance.
License · maintenance · safety
MIT (permissive) — MIT license permits free use, modification, and distribution with minimal restrictions, making it legally straightforward to adopt.
last release 2026-02-10 (185 days) · last repo commit 2026-05-01 · 6 stars · archived
0 known vulnerabilities (OSV.dev, 2026-08-14) · 180,652 downloads/mo, #10,143 on PyPI
Alternatives
Verify before relying
pip install napari-plugin-engine
from napari_plugin_engine import HookimplementationMarker
hookimpl = HookimplementationMarker('napari')- Whether existing napari installations still depend on this package or have migrated to npe2
- Compatibility with Python versions beyond 3.10 given the abandoned status
- Whether the lazy plugin discovery feature remains performant in production deployments
What it is and what it does
napari-plugin-engine is a fork of pluggy, adapted by the napari team to provide plugin discovery and hook execution. It allows applications to register and call plugins using either naming conventions or entry points, with features like lazy discovery, hook reordering, and enhanced metadata retrieval. The package includes type annotations and pytest fixtures for testing.
This is the first-generation napari plugin engine and is now deprecated. The napari project has moved to npe2 as the recommended plugin system for all new development. Existing plugins are encouraged to migrate. The package remains available for legacy compatibility but receives no active maintenance.
Use it for
- Loading and executing plugins in legacy napari installations that have not yet migrated to npe2
- Testing plugin systems that use hook-based architecture with pytest fixtures
- Understanding the evolution of napari's plugin architecture before the npe2 transition
- Maintaining older napari-based applications that depend on the first-generation plugin engine
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No.
The package is officially deprecated and abandoned; the napari team explicitly recommends npe2 for all new plugins and existing plugins to migrate. Install only if you are maintaining legacy code that cannot yet move to npe2. For new development, use npe2 instead.
Install
napari-plugin-engine on PyPI
Before you install
Low install friction with a single runtime dependency (importlib-metadata). However, the package is abandoned—the repository is archived and officially deprecated in favor of npe2, with no active maintenance.
Requires Python 3.6 or later; package is deprecated and no longer maintained.
License in practice
MIT license permits free use, modification, and distribution with minimal restrictions, making it legally straightforward to adopt.
Quickstart
pip install napari-plugin-engine
from napari_plugin_engine import HookimplementationMarker
hookimpl = HookimplementationMarker('napari')Verify before relying
- Whether existing napari installations still depend on this package or have migrated to npe2
- Compatibility with Python versions beyond 3.10 given the abandoned status
- Whether the lazy plugin discovery feature remains performant in production deployments
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.6 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageimportlib-metadata |
| Maintenance | Abandoned 185 days since the last release |
| Last repo commit | repository archived |
| First released | |
| Downloads | 180,652 / month, #10,143 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: EducationIntended Audience :: Science/ResearchLicense :: OSI Approved :: MIT LicenseOperating System :: MacOSOperating System :: Microsoft :: WindowsOperating System :: POSIXProgramming Language :: PythonProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Scientific/EngineeringTopic :: Scientific/Engineering :: Bio-InformaticsTopic :: Scientific/Engineering :: Information AnalysisTopic :: Scientific/Engineering :: VisualizationTopic :: Software Development :: LibrariesTopic :: Software Development :: TestingTopic :: Utilities |
Evidence: napari_plugin_engine-0.2.1-py3-none-any.whl
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See also npe2 · napari-plugin-manager · napari-svg · napari · napari-console · entrypoints · plux · robotcode-plugin · pluginbase