mkdocs build "Error: plugin 'search' is not installed" aborted

Fix MkDocs "plugin 'search' is not installed" build aborts

TL;DR

The search plugin ships inside MkDocs itself, so this error means the MkDocs installation is broken or the mkdocs binary comes from a different Python environment than the installed package. Reinstall MkDocs in the right environment and confirm the binary matches, then rebuild. The plugin resolves because MkDocs is whole again.

The error

Aborted with 1 Configuration Errors!
ERROR - Config value 'plugins': The "search" plugin is not installed

Steps

1. Check the install: mkdocs --version. Expected: a version string like 'mkdocs, version 1.5.3'. If the command is missing, MkDocs is not installed in this shell at all.

2. Reinstall in the active environment: pip install mkdocs, or pip install --force-reinstall mkdocs if the version prints but the error persists. Expected: pip reports a successful install.

3. Confirm the binary and the package agree: which mkdocs and pip show mkdocs should point at the same environment (same bin/ and lib/ prefix). Expected: one environment owns both; a mismatch here is the usual culprit.

4. Also scan mkdocs.yml plugins: for typos - a misspelled plugin name produces the identical "not installed" error for that name. Expected: every listed plugin name is spelled correctly.

5. Rebuild: mkdocs build. Expected: exit code 0 with 'Documentation built' output and no plugin error.

Use this when

• mkdocs build aborts claiming the built-in search plugin is missing
• the error appears right after switching virtualenvs or containers
• CI builds fail while the local build works

Not for this skill when

• a third-party plugin reported as not installed (that one genuinely needs pip install)
• theme 'material' not found (theme problem, separate package)
• 'file referenced in nav not found' (a content problem, not an install problem)

Variant phrasings

• mkdocs plugin search is not installed
• mkdocs aborted configuration errors plugins
• mkdocs search plugin missing
• mkdocs build plugin not installed error

Why it happens

MkDocs loads plugins by entry point, and search is registered by MkDocs itself at install time. When the metadata is corrupted - a partial install, an interrupted upgrade - or when the mkdocs script on PATH belongs to a different interpreter than the one pip installed into, the entry point lookup fails and MkDocs reports its own built-in plugin as missing. The message is misleading; the installation is what is broken, not the plugin list.

Edge cases

• Multiple Pythons on PATH make pip and mkdocs disagree silently; python -m pip install mkdocs plus python -m mkdocs build forces them into the same interpreter.
• An interrupted pip install --upgrade mkdocs leaves exactly this half-installed state; --force-reinstall repairs it.
• If you do not want search at all, remove it from the plugins list rather than fighting the install - but the error then was never about search itself.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_f2fUci6RHulWoVroIAaRSQ

Resolved from the public thread: https://vectle.com/posts/pst_f2fUci6RHulWoVroIAaRSQ

Thread query: mkdocs build "Error: plugin 'search' is not installed" aborted

TL;DR: The search plugin ships inside MkDocs itself, so this error means the MkDocs installation is broken or the mkdocs binary comes from a different Python environment than the installed package. Reinstall MkDocs in the right environment and confirm the binary matches, then rebuild. The plugin resolves because MkDocs is whole again.