fix(everything): give gzip-file-as-resource's resource the resource icons

.changeset/everything-5434-generated-resource-icons.md

@@ -0,0 +1,5 @@
+---
+"@modelcontextprotocol/server-everything": patch
+---
+
+Give the resource `gzip-file-as-resource` creates the light and dark resource icons, like every other resource. A 2025-era client now sees them on the session resource's `resources/list` entry and on the returned link; a 2026-07-28 client sees them on the minted resource link.

src/everything/__tests__/gzip-file-as-resource.test.ts

@@ -22,6 +22,7 @@ import {
   textOf,
   type Session,
 } from "./harness.js";
+import { RESOURCE_ICONS } from "../server/icons.js";
 
 const TEXT = "hello, gzip";
 const DATA_URI = `data:text/plain;base64,${Buffer.from(TEXT).toString("base64")}`;
@@ -100,6 +101,7 @@ describe("gzip-file-as-resource", () => {
         uri: "demo://resource/session/hello.txt.gz",
         name: "hello.txt.gz",
         mimeType: "application/gzip",
+        icons: RESOURCE_ICONS,
       },
     ]);
     const blob = await readBlob(s, "demo://resource/session/hello.txt.gz");
@@ -114,6 +116,7 @@ describe("gzip-file-as-resource", () => {
       uri: "demo://resource/session/listed.gz",
       name: "listed.gz",
       mimeType: "application/gzip",
+      icons: RESOURCE_ICONS,
     });
     expect(
       ofMethod(s.notifications, "notifications/resources/list_changed").length,

src/everything/__tests__/icons.test.ts

@@ -6,7 +6,8 @@
  * (server/icons.ts). These tests read what crosses the wire, in both
  * protocol eras: `serverInfo` from `initialize` (2025-era) or
  * `server/discover` (2026-07-28), and every entry of `tools/list`,
- * `prompts/list`, `resources/list` and `resources/templates/list`. Each
+ * `prompts/list`, `resources/list` and `resources/templates/list`, and the
+ * resource link a tool returns for a resource it creates (#5434). Each
  * must carry a "light" and a "dark" icon, and each icon must be a scalable
  * SVG `data:` URI that decodes to an SVG document.
  */
@@ -17,6 +18,8 @@ import {
   connect,
   connectModern,
   connectRaw,
+  contentOf,
+  contentOfType,
   MODERN_CAPABILITIES,
   type RawSession,
   type Session,
@@ -41,6 +44,9 @@ afterEach(async () => {
 
 const SVG_DATA_URI = "data:image/svg+xml;base64,";
 
+/** A small file for gzip-file-as-resource; a data: URI needs no network. */
+const DATA_URI = `data:text/plain;base64,${Buffer.from("icons").toString("base64")}`;
+
 /** Assert that `icons` is a themed pair of decodable SVG icons. */
 function expectThemedPair(icons: Icon[] | undefined): void {
   expect(icons).toBeDefined();
@@ -126,6 +132,35 @@ describe.each([
       expect(template.icons).toEqual(RESOURCE_TEMPLATE_ICONS);
     }
   });
+
+  // #5434: a resource a tool creates is a resource too: its link carries the
+  // resource pair, whichever era's mechanism keeps it readable (a session
+  // resource for a 2025-era client, a minted URI on 2026-07-28).
+  it("puts the resource pair on the link gzip-file-as-resource returns", async () => {
+    session = await open();
+    const result = await session.client.callTool({
+      name: "gzip-file-as-resource",
+      arguments: { name: "icons.gz", data: DATA_URI },
+    });
+    const link = contentOfType(contentOf(result)[0], "resource_link");
+    expect(link.icons).toEqual(RESOURCE_ICONS);
+  });
+});
+
+// #5434: on the 2025 era the tool also registers the file as a session
+// resource, which then appears in resources/list with the pair.
+it("puts the resource pair on the session resource gzip-file-as-resource lists", async () => {
+  session = await connect({ capabilities: ALL_CAPABILITIES });
+  await session.client.callTool({
+    name: "gzip-file-as-resource",
+    arguments: { name: "listed-icons.gz", data: DATA_URI },
+  });
+  const { resources } = await session.client.listResources();
+  const generated = resources.find((r) => r.name === "listed-icons.gz");
+  expect(generated?.icons).toEqual(RESOURCE_ICONS);
+  for (const resource of resources) {
+    expect(resource.icons).toEqual(RESOURCE_ICONS);
+  }
 });
 
 describe("icons on the raw 2026-07-28 wire", () => {

src/everything/resources/minted.ts

@@ -20,7 +20,7 @@ import {
   ResourceTemplate,
   type ResourceLink,
 } from "@modelcontextprotocol/server";
-import { RESOURCE_TEMPLATE_ICONS } from "../server/icons.js";
+import { RESOURCE_ICONS, RESOURCE_TEMPLATE_ICONS } from "../server/icons.js";
 
 /** How long a minted resource stays readable, in milliseconds. */
 export const MINTED_RESOURCE_TTL_MS = 10 * 60_000;
@@ -110,6 +110,8 @@ export function mintBlobResource(
     name,
     mimeType,
     description: `Created by a tool call; readable for ${MINTED_RESOURCE_TTL_MS / 60_000} minutes at this URI`,
+    // #5434: a minted resource is a resource like any other (#3131).
+    icons: RESOURCE_ICONS,
   };
 }
 

src/everything/tools/gzip-file-as-resource.ts

@@ -34,7 +34,7 @@ import {
   registerSessionResource,
 } from "../resources/session.js";
 import type { ServerContext } from "../server/context.js";
-import { TOOL_ICONS } from "../server/icons.js";
+import { RESOURCE_ICONS, TOOL_ICONS } from "../server/icons.js";
 
 // Maximum input file size - 10 MB default
 const GZIP_MAX_FETCH_SIZE = Number(
@@ -230,7 +230,9 @@ export const registerGZipFileAsResourceTool = (
     const uri = getSessionResourceURI(name);
     const blob = compressedBuffer.toString("base64");
     const mimeType = "application/gzip";
-    const resource = <Resource>{ uri, name, mimeType };
+    // #5434: the session resource is listed like any other, so it carries
+    // the resource icons (#3131) in resources/list and in its link.
+    const resource = <Resource>{ uri, name, mimeType, icons: RESOURCE_ICONS };
 
     // Return the resource or a resource link that can be used to access this resource later
     if (outputType === "resource") {