A declared plugin (note: Plugin) needs a system (19 passages, no note) tool that is not installed on the machine (4 passages, no note) that builds (note: Build): the build ran the detection command (21 passages, no note) of every system dependency (3 passages, no note) of the manifest (4 passages, no note), one answered (3 passages, no note) nothing, and the plugin was not registered, so that none of its readers (note: Reader), converters (note: Converter), sources (note: Source), inference methods (3 passages, no note), checks (note: Check), projections (4 passages, no note) or components (46 passages, no note) took part in the build. An optional dependency (8 passages, no note) yields the same finding (note: Finding) as info and the plugin stays registered. The fix is the tool on the PATH of the build, or the plugin removed from plugins:; a project (note: Project) whose conversions (note: Conversion) must run raises the severity (note: Severity) to error.
Check W-PLUGIN-DISABLED, severity warning by default, documented with a before and after example in the check pages. The severity can be overridden per project or per repository (note: Knowledge repository).