diff --git a/packages/md/src/plugins/heading-extract.ts b/packages/md/src/plugins/heading-extract.ts
deleted file mode 100644
index aa8f4989b..000000000
--- a/packages/md/src/plugins/heading-extract.ts
+++ /dev/null
@@ -1,39 +0,0 @@
-import type { RenderOptions, Token } from 'markdown-exit';
-import type MarkdownExit from 'markdown-exit';
-
-export type HeadingData = Readonly<{
-  depth: number;
-  slug: string;
-  text: string;
-}>;
-
-type MarkdownEnv = Record<string, unknown> & {
-  headings?: Array<HeadingData>;
-};
-
-/**
- * Extracts heading metadata into env.headings during rendering.
- * Ported from VitePress headersPlugin.
- */
-export function headingExtractPlugin(md: MarkdownExit): void {
-  const render = md.renderer.render.bind(md.renderer);
-  md.renderer.render = (tokens: Array<Token>, options: RenderOptions, env: MarkdownEnv = {}) => {
-    env.headings = [];
-    for (let tokenIndex = 0; tokenIndex < tokens.length; tokenIndex++) {
-      const token = tokens[tokenIndex];
-      if (token.type === 'heading_open') {
-        const depth = Number(token.tag.slice(1));
-        const slug = token.attrGet?.('id') ?? '';
-        const inline = tokens[tokenIndex + 1];
-        const text = (
-          inline?.children
-            ?.filter((child) => child.type === 'text' || child.type === 'code_inline')
-            .map((child) => child.content)
-            .join('') ?? ''
-        ).trim();
-        env.headings.push({ depth, slug, text });
-      }
-    }
-    return render(tokens, options, env);
-  };
-}