Change:
"configuration.markdown.suggest.paths.enabled.description": "Enable/disable path suggestions for markdown links", "configuration.markdown.editor.drop.enabled": "Enable/disable dropping into the markdown editor to insert shift. Requires enabling `#editor.dropIntoEditor.enabled#`.", "configuration.markdown.editor.pasteLinks.enabled": "Enable/disable pasting files into a Markdown editor inserts Markdown links. Requires enabling `#editor.experimental.pasteActions.enabled#`.", <del> "configuration.markdown.experimental.validate.enabled.description": "Enable/disable all error reporting in Markdown files.", "configuration.markdown.experimental.validate.referenceLinks.enabled.description": "Validate reference links in Markdown files, e.g. `[link][ref]`.  Requires enabling `#markdown.experimental.validate.enabled#`.", "configuration.markdown.experimental.validate.fragmentLinks.enabled.description": "Validate fragment links to headers in the current Markdown file, e.g. `[link](#header)`. Requires enabling `#markdown.experimental.validate.enabled#`.", "configuration.markdown.experimental.validate.fileLinks.enabled.description": "Validate links to other files in Markdown files, e.g. `[link](/path/to/file.md)`. This checks that the target files exists. Requires enabling `#markdown.experimental.validate.enabled#`.", "configuration.markdown.experimental.validate.fileLinks.markdownFragmentLinks.description": "Validate the fragment part of links to headers in other files in Markdown files, e.g. `[link](/path/to/file.md#header)`. Inherits the setting value from `#markdown.experimental.validate.fragmentLinks.enabled#` by default.", "configuration.markdown.experimental.validate.ignoreLinks.description": "Configure links that should not be validated. For example `/about` would not validate the link `[about](/about)`, while the glob `/assets/**/*.svg` would let you skip validation for any link to `.svg` files under the `assets` directory.", </del> <ins> "configuration.markdown.validate.enabled.description": "Enable/disable all error reporting in Markdown files.", "configuration.markdown.validate.referenceLinks.enabled.description": "Validate reference links in Markdown files, e.g. `[link][ref]`.  Requires enabling `#markdown.validate.enabled#`.", "configuration.markdown.validate.fragmentLinks.enabled.description": "Validate fragment links to headers in the current Markdown file, e.g. `[link](#header)`. Requires enabling `#markdown.validate.enabled#`.", "configuration.markdown.validate.fileLinks.enabled.description": "Validate links to other files in Markdown files, e.g. `[link](/path/to/file.md)`. This checks that the target files exists. Requires enabling `#markdown.validate.enabled#`.", "configuration.markdown.validate.fileLinks.markdownFragmentLinks.description": "Validate the fragment part of links to headers in other files in Markdown files, e.g. `[link](/path/to/file.md#header)`. Inherits the setting value from `#markdown.validate.fragmentLinks.enabled#` by default.", "configuration.markdown.validate.ignoredLinks.description": "Configure links that should not be validated. For example adding `/about` would not validate the link `[about](/about)`, while the glob `/assets/**/*.svg` would let you skip validation for any link to `.svg` files under the `assets` directory.", </ins> "configuration.markdown.experimental.updateLinksOnFileMove.enabled": "Try to update links in Markdown files when a file is renamed/moved in the workspace. Use `#markdown.experimental.updateLinksOnFileMove.externalFileGlobs#` to configure which files trigger link updates.", "configuration.markdown.experimental.updateLinksOnFileMove.enabled.prompt": "Prompt on each file move.", "configuration.markdown.experimental.updateLinksOnFileMove.enabled.always": "Always update links automatically.",

Discussion:
Add some form of error reporting for links in markdown files where we are confident that link is incorrect. Example: We should also have a setting to disable this error reporting since we will not be able to understand every flavor of markdown link
Bad references (seems like this should almost always be a reasonable error to report) Missing files (false positive if users rely on different logic to resolve markdown paths) - Missing headers (false positive if users rely on custom slugifier or are linking to something besides headers, such as html elements) -Checking links to external resources () Checking html in markdown
Re-opening as we will likely keep this as experimental this iteration