diff --git a/apps/server/src/services/skills/builtin-skills/submit-a-plugin/SKILL.md b/apps/server/src/services/skills/builtin-skills/submit-a-plugin/SKILL.md
index da959b682..92fff0243 100644
--- a/apps/server/src/services/skills/builtin-skills/submit-a-plugin/SKILL.md
+++ b/apps/server/src/services/skills/builtin-skills/submit-a-plugin/SKILL.md
@@ -215,7 +215,7 @@ Include these required fields:
 - `author`
 - `source`
 
-Use `tags` and `engines` when they provide useful search or compatibility data.
+Use `tags` when they provide useful search data.
 
 The `id` must match the filename and the plugin manifest ID.
 
@@ -227,7 +227,7 @@ Do not use claims such as "best," "powerful," or "easy." Describe observed behav
 
 Use up to ten specific lowercase tags. Use hyphens in tags with multiple words.
 
-Copy honest engine ranges from the plugin manifest. A marketplace entry can narrow those ranges but cannot widen them.
+Keep engine ranges in the plugin manifest. The marketplace entry does not declare compatibility.
 
 Set `author.github` to the GitHub account that opens the pull request.
 
@@ -253,10 +253,6 @@ Use this shape as a guide. Confirm every field against the current schema.
     "github": "acme",
     "url": "https://acme.example"
   },
-  "engines": {
-    "bb": ">=0.40.0",
-    "bbPluginSdk": ">=0.5.0"
-  },
   "source": {
     "git": {
       "url": "https://github.com/acme/bb-plugin-notes.git",
diff --git a/apps/server/test/skills/submit-a-plugin-schema.repro.test.ts b/apps/server/test/skills/submit-a-plugin-schema.repro.test.ts
new file mode 100644
index 000000000..925d37888
--- /dev/null
+++ b/apps/server/test/skills/submit-a-plugin-schema.repro.test.ts
@@ -0,0 +1,41 @@
+import { readFile } from "node:fs/promises";
+import { fileURLToPath } from "node:url";
+import { Ajv2020 } from "ajv/dist/2020.js";
+import { describe, expect, it } from "vitest";
+import { z } from "zod";
+
+const skillPath = fileURLToPath(
+  new URL(
+    "../../src/services/skills/builtin-skills/submit-a-plugin/SKILL.md",
+    import.meta.url,
+  ),
+);
+const schemaPath = fileURLToPath(
+  new URL("../../../web/public/schemas/marketplace.schema.json", import.meta.url),
+);
+
+describe("submit-a-plugin marketplace entry example", () => {
+  it("conforms to the published marketplace schema", async () => {
+    const skill = await readFile(skillPath, "utf8");
+    const marker = "Use this shape as a guide. Confirm every field against the current schema.";
+    const markerIndex = skill.indexOf(marker);
+    if (markerIndex < 0) throw new Error("entry example marker is missing");
+
+    const match = /```json\n([\s\S]*?)\n```/u.exec(skill.slice(markerIndex));
+    if (match?.[1] === undefined) throw new Error("entry JSON example is missing");
+    const entry = JSON.parse(match[1]);
+
+    const schema = z.record(z.string(), z.unknown()).parse(
+      JSON.parse(await readFile(schemaPath, "utf8")),
+    );
+    const validate = new Ajv2020({ strict: false }).compile(schema);
+    const manifest = {
+      schemaVersion: 1,
+      name: "example",
+      displayName: "Example plugins",
+      plugins: [entry],
+    };
+
+    expect(validate(manifest), JSON.stringify(validate.errors)).toBe(true);
+  });
+});