Feature switches

There is one edition of Developer Assistance Tools. Some tools are grouped into removable feature modules, and a build can leave any of them out. This is how a smaller build, with a smaller audit surface, is produced for a particular deployment.

The file

features.json at the repository root has two parts:

disabled: a list of feature names to leave out. It is empty by default.
features: the available modules, each with a title, a summary, the pages it owns and the files (scripts, styles and vendored libraries) only it uses.

Available features

Key	Title	Pages removed
`sql`	SQL Workspace and Schema Designer	`tools/data/sql.html`, `tools/data/schema.html`
`api`	API toolkit (OpenAPI and Swagger viewer, HTTP header reference, test payload builder)	`tools/api/swagger.html`, `tools/api/http-headers.html`, `tools/data/payloads.html`
`documents`	Documents and media (PDF tools, compressor, image editor, SVG tools, CSV editor)	`tools/media/pdf-tools.html`, `tools/media/compress.html`, `tools/media/image-editor.html`, `tools/media/svg-tools.html`, `tools/data/csv.html`
`code`	Code playgrounds (JavaScript playground, HTML viewer)	`tools/dev/editor.html`, `tools/dev/html-viewer.html`
`operations`	Operations toolkit (log analyser, deployment manifest builder, command reference)	`tools/data/log-analyzer.html`, `tools/dev/deploy-manifest.html`, `tools/text/reference.html`
`diagrams`	Diagrams and whiteboard	`tools/diagrams/diagrams.html`, `tools/diagrams/whiteboard.html`
`ai`	AI features (prompt workbench)	`tools/dev/ai-tools.html`

What a switch removes

When a feature is disabled, the build strips its pages, the vendored libraries only it uses, its catalogue entries and its redirects. Libraries that more than one feature loads (pdf-lib, fontkit and unifont, used by both documents and operations) are not listed under any feature and ship in every build.

How to use it

Add the feature names to disabled in features.json:
```
"disabled": ["ai", "diagrams"],
```
Rebuild the site:
Terminal window
```
node scripts/build/build-pages.mjs
```
The build writes into dist/. A self-hosted release built with node scripts/build/build-container.mjs also reads features.json, so edit it before building the release; see Self-hosting.
To bring a feature back, delete its name from disabled and rebuild.

The switches apply at build time only. They do not change a site that has already been built.