diff --git a/packages/markdown-core/src/render.capabilities.test.ts b/packages/markdown-core/src/render.capabilities.test.ts
deleted file mode 100644
index 1d428b89b9f4..000000000000
--- a/packages/markdown-core/src/render.capabilities.test.ts
+++ /dev/null
@@ -1,74 +0,0 @@
-import { describe, expect, it } from "vitest";
-import type { FormatCapabilityProfile } from "./format-capabilities.js";
-import { markdownToIR } from "./ir.js";
-import { renderMarkdownWithAttributedRanges } from "./render-attributed.js";
-import { renderMarkdownWithMarkers } from "./render.js";
-
-const ALL_NATIVE = {
-  mechanism: "markdown",
-  constructs: {
-    bold: "native",
-    italic: "native",
-    underline: "native",
-    strikethrough: "native",
-    spoiler: "native",
-    codeInline: "native",
-    codeBlock: "native",
-    codeLanguage: "native",
-    linkLabel: "native",
-    heading: "native",
-    bulletList: "native",
-    orderedList: "native",
-    taskList: "native",
-    table: "native",
-    blockquote: "native",
-    image: "native",
-    mention: "native",
-  },
-  chunk: { limit: 4_000, unit: "chars" },
-} satisfies FormatCapabilityProfile;
-
-describe("format capability driver plumbing", () => {
-  const ir = markdownToIR("**See [docs](https://example.com)**", { headingStyle: "rich" });
-
-  it("keeps marker rendering byte-identical for an all-native optional profile", () => {
-    const options = {
-      styleMarkers: { bold: { open: "<b>", close: "</b>" } },
-      escapeText: (text: string) => text,
-      buildLink: (link: { start: number; end: number; href: string }) => ({
-        start: link.start,
-        end: link.end,
-        open: "<a>",
-        close: "</a>",
-      }),
-    };
-    expect(renderMarkdownWithMarkers(ir, options, ALL_NATIVE)).toBe(
-      renderMarkdownWithMarkers(ir, options),
-    );
-  });
-
-  it("preserves caller-constructed style spans for an all-native profile", () => {
-    const customIr = {
-      text: "same",
-      styles: [
-        { start: 0, end: 2, style: "bold" as const },
-        { start: 2, end: 4, style: "bold" as const },
-      ],
-      links: [],
-    };
-    const options = {
-      styleMarkers: { bold: { open: "*", close: "*" } },
-      escapeText: (text: string) => text,
-    };
-    expect(renderMarkdownWithMarkers(customIr, options, ALL_NATIVE)).toBe(
-      renderMarkdownWithMarkers(customIr, options),
-    );
-  });
-
-  it("keeps attributed rendering byte-identical for an all-native optional profile", () => {
-    const options = { styleMap: { bold: "strong" as const }, renderLink: () => " (url)" };
-    expect(renderMarkdownWithAttributedRanges(ir, options, ALL_NATIVE)).toEqual(
-      renderMarkdownWithAttributedRanges(ir, options),
-    );
-  });
-});