diff --git a/tests/runner-e2e/generated-report-carriers.test.ts b/tests/runner-e2e/generated-report-carriers.test.ts
new file mode 100644
index 00000000000..080bb08cee2
--- /dev/null
+++ b/tests/runner-e2e/generated-report-carriers.test.ts
@@ -0,0 +1,50 @@
+import { afterEach, expect, it } from "vitest";
+import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { assertGeneratedReportCarriers } from "./manual-private-transfer.js";
+import { sealManualResultEvidence, type ManualPrivateHandoff } from "./manual-private-handoff.js";
+import { canonicalGeneratedReportAsset } from "./manual-private-report-assets.js";
+import { MANUAL_PRIVATE_EXECUTIONS, MANUAL_PRIVATE_PROTOCOL } from "./manual-private-retention.js";
+import { privateRefusalCode } from "./private-refusal-code.js";
+
+const roots: string[] = [];
+afterEach(async () => { await Promise.all(roots.splice(0).map(root => rm(root, { recursive: true, force: true }))); });
+async function report(files: Record<string, string | Buffer>) {
+  const root = await mkdtemp(path.join(os.tmpdir(), "generated-report-carriers-")); roots.push(root);
+  const source = path.join(root, "runner-e2e-merged-report");
+  for (const [name, data] of Object.entries({ "html/index.html": "<html></html>", "normalized/summary.md": "summary", ...files })) {
+    await mkdir(path.dirname(path.join(source, name)), { recursive: true });
+    await writeFile(path.join(source, name), data);
+  }
+  return { root, source };
+}
+const cell = "normalized/evidence/chat-features.runner-opencode.local.case/attempt-1/html-report/trace";
+
+it("accepts standard carriers and authenticated trace viewer assets", async () => {
+  const logo = await readFile(canonicalGeneratedReportAsset("html/trace/playwright-logo.svg")!);
+  const { source } = await report({ "html/trace/playwright-logo.svg": logo, "html/data/0123456789abcdef0123456789abcdef01234567.zip": "zip" });
+  await expect(assertGeneratedReportCarriers(source)).resolves.toBeUndefined();
+});
+
+it.each([
+  [`${cell}/codicon.DCmgc-ay.ttf`, "font"],
+  [`${cell}/playwright-logo.svg`, "svg"],
+  [`${cell}/manifest.webmanifest`, "webmanifest"],
+  ["html/data/0123456789abcdef0123456789abcdef01234567.jpeg", "image"],
+  ["normalized/report.js.map", "source-map"],
+  ["normalized/LICENSE", "no-extension"],
+  ["normalized/archive.tar", "other"],
+  ["html/trace/index.js.map", "trace-viewer-asset"],
+  ["html/trace/playwright-logo.svg", "trace-viewer-bytes"],
+])("names a refused %s carrier by its closed category, never its path", async (name, category) => {
+  const { root, source } = await report({ [name]: "synthetic carrier" });
+  const refusal = await assertGeneratedReportCarriers(source).then(() => undefined, (error: unknown) => error);
+  const code = privateRefusalCode(refusal);
+  expect(code).toBe(`unsupported-generated-report-carrier-${category}`);
+  expect(code).not.toContain("chat-features");
+  // The authoritative seal refuses the same tree, so the preflight never hides an admissible report.
+  const context = { root, private: true, protocol: MANUAL_PRIVATE_PROTOCOL, workflowSha: "a".repeat(40), targetSha: "b".repeat(40), runId: "123",
+    attempt: "1", executionIds: [MANUAL_PRIVATE_EXECUTIONS[0]!] } as ManualPrivateHandoff;
+  await expect(sealManualResultEvidence(context, [], source, "generated-report")).rejects.toThrow("Unsupported packaged evidence carrier");
+});
diff --git a/tests/runner-e2e/manual-private-transfer.ts b/tests/runner-e2e/manual-private-transfer.ts
index 81f77bb9ca4..e6b5e3f6967 100644
--- a/tests/runner-e2e/manual-private-transfer.ts
+++ b/tests/runner-e2e/manual-private-transfer.ts
@@ -206,6 +206,39 @@ async function verifyDownloads(env: NodeJS.ProcessEnv) {
   }
   await writeFile(path.join(root, "manual-report-input-completeness.json"), JSON.stringify({ meaning: "available-files-and-transfer-only", doesNotAttestFeatureOutcome: true, cells }), { mode: 0o600, flag: "wx" });
 }
+/**
+ * Names the first carrier the generated-report seal would refuse with a closed
+ * category, so a refused report is diagnosable without its paths. The seal stays
+ * authoritative; this only runs before it and never admits anything.
+ */
+export async function assertGeneratedReportCarriers(source: string) {
+  let visited = 0;
+  async function visit(relative: string): Promise<void> {
+    for (const entry of await readdir(path.join(source, relative), { withFileTypes: true })) {
+      if (++visited > 4096) return;
+      const name = relative ? `${relative}/${entry.name}` : entry.name;
+      if (entry.isDirectory() && !entry.isSymbolicLink()) { if (name.split("/").length < 24) await visit(name); continue; }
+      if (!entry.isFile() || entry.isSymbolicLink()) continue;
+      const canonical = canonicalGeneratedReportAsset(name);
+      if (name.startsWith("html/trace/") || canonical !== undefined) {
+        if (!canonical) throw new Error("Unsupported generated report carrier (trace viewer asset)");
+        if (!await isTrustedGeneratedReportAsset(name, await readFile(path.join(source, name))))
+          throw new Error("Unsupported generated report carrier (trace viewer bytes)");
+        continue;
+      }
+      if (isStandardEvidenceFile(`html-report/${name}`)) continue;
+      const extension = path.extname(name).toLowerCase();
+      if ([".ttf", ".otf", ".woff", ".woff2"].includes(extension)) throw new Error("Unsupported generated report carrier (font)");
+      if (extension === ".svg") throw new Error("Unsupported generated report carrier (svg)");
+      if (extension === ".webmanifest") throw new Error("Unsupported generated report carrier (webmanifest)");
+      if ([".jpg", ".jpeg", ".gif", ".webp", ".avif", ".bmp", ".ico"].includes(extension)) throw new Error("Unsupported generated report carrier (image)");
+      if (extension === ".map") throw new Error("Unsupported generated report carrier (source map)");
+      if (!extension) throw new Error("Unsupported generated report carrier (no extension)");
+      throw new Error("Unsupported generated report carrier (other)");
+    }
+  }
+  await visit("");
+}
 export async function uploadReport(env: NodeJS.ProcessEnv) {
   requireSession(env); const { approval, bucket } = request(env), source = await realpath(env.PRIVATE_REPORT_SOURCE ?? ""), root = await realpath(env.PRIVATE_REPORT_ROOT ?? "");
   if (!source.startsWith(`${root}${path.sep}`)) throw new Error("Private report escaped owned staging");
@@ -213,6 +246,7 @@ export async function uploadReport(env: NodeJS.ProcessEnv) {
   if (evidenceCompleteness.meaning !== "available-files-and-transfer-only" || evidenceCompleteness.doesNotAttestFeatureOutcome !== true
     || evidenceCompleteness.cells.map(cell => cell.executionId).sort().join() !== [...approval.executionIds].sort().join()) throw new Error("Private report lacks exact cell completeness receipts");
   const secrets = normalizedSecrets([...CREDENTIAL_NAMES.map(name => env[name]), env.AWS_ACCESS_KEY_ID, env.AWS_SECRET_ACCESS_KEY, env.AWS_SESSION_TOKEN]);
+  await assertGeneratedReportCarriers(source);
   await sealManualResultEvidence({ root, protocol: MANUAL_PRIVATE_PROTOCOL, private: true, workflowSha: approval.workflowSha,
     targetSha: approval.targetSha, runId: approval.runId, attempt: approval.attempt, executionIds: [...approval.executionIds] }, secrets, source, "generated-report");
   const sealed = path.join(root, "sealed-results");
diff --git a/tests/runner-e2e/report.test.ts b/tests/runner-e2e/report.test.ts
index c65610db9d3..8a492b5156a 100644
--- a/tests/runner-e2e/report.test.ts
+++ b/tests/runner-e2e/report.test.ts
@@ -697,6 +697,33 @@ describe("runner E2E report aggregation", () => {
     ).toBe("warm-turn-png");
   });
 
+  it("does not stage a private cell's trace viewer font, SVG or manifest into the merged report", async () => {
+    const root = await mkdtemp(path.join(os.tmpdir(), "runner-e2e-report-carriers-"));
+    cleanupDirectories.push(root);
+    const executionId = "chat-features.runner-opencode.local.runs-adapters.inspect-failed-run";
+    const directory = path.join(root, "attempt-1");
+    const staged = ["final-state.png", "html-report/index.html", "html-report/trace/index.html", "html-report/trace/index.KZ4wOW1K.js", "html-report/data/0123456789abcdef0123456789abcdef01234567.zip"];
+    const refused = ["html-report/trace/codicon.DCmgc-ay.ttf", "html-report/trace/manifest.webmanifest", "html-report/trace/playwright-logo.svg"];
+    for (const file of [...staged, ...refused]) {
+      await mkdir(path.join(directory, path.dirname(file)), { recursive: true });
+      await writeFile(path.join(directory, file), `synthetic ${file}`);
+    }
+    await writeFile(path.join(directory, "result.json"), JSON.stringify({
+      schema: "paperclip.runner-e2e.result/v1", executionId, attempt: 1, status: "passed",
+      profileId: "runner-opencode", environmentId: "local", caseId: "runs-adapters.inspect-failed-run", provider: "opencode", model: "fixture-model",
+      runtimeMode: "native", startedAt: "2026-11-07T00:00:00.000Z", finishedAt: "2026-11-07T00:00:01.000Z", durationMs: 1_000, cleanup: "passed",
+    } satisfies RunnerE2EResult));
+    await writeFile(path.join(directory, "evidence-manifest.json"), JSON.stringify({ files: [...staged, ...refused], leaks: [], missing: [] }));
+    const output = path.join(root, "merged");
+    await execFileAsync(process.execPath, [path.join(repositoryRoot, "cli/node_modules/tsx/dist/cli.mjs"), path.join(repositoryRoot, "tests/runner-e2e/report.ts")], {
+      cwd: repositoryRoot,
+      env: { ...process.env, PAPERCLIP_RUNNER_E2E_REPORT_ROOT: root, PAPERCLIP_RUNNER_E2E_REPORT_OUT: output, PAPERCLIP_RUNNER_E2E_EXPECTED_IDS: JSON.stringify([executionId]) },
+    }).catch(error => { throw new Error(String(error.stderr).slice(-1500)); });
+    const evidence = path.join(output, "evidence", executionId, "attempt-1");
+    for (const file of staged) expect(await readFile(path.join(evidence, file), "utf8")).toBe(`synthetic ${file}`);
+    for (const file of refused) await expect(readFile(path.join(evidence, file))).rejects.toMatchObject({ code: "ENOENT" });
+  });
+
   it("constructs the public root JUnit from fixed markup and escaped fields", async () => {
     const root = await mkdtemp(
       path.join(os.tmpdir(), "runner-e2e-report-junit-test-"),
diff --git a/tests/runner-e2e/report.ts b/tests/runner-e2e/report.ts
index 7167e7316c1..7a71042e642 100644
--- a/tests/runner-e2e/report.ts
+++ b/tests/runner-e2e/report.ts
@@ -24,6 +24,7 @@ import {
   upgradeRunnerResult,
 } from "./history.js";
 import { resolveRunnerE2ESource } from "./source.js";
+import { isStandardEvidenceFile } from "./evidence.js";
 import { runnerE2ESummaryLinks } from "./summary-links.js";
 import type { RunnerE2EResult } from "./types.js";
 import { gradeRetainedDependableResults, type DependableQualification } from "./dependable-qualification.js";
@@ -120,6 +121,12 @@ async function stageDashboardEvidence(
     for (const relative of entry.evidence?.files ?? []) {
       const segments = safeEvidenceRelative(relative);
       if (!segments) continue;
+      // A private cell also lists its HTML report's trace viewer program files
+      // (font, SVG, web manifest). They are not evidence: the merged report has
+      // its own authenticated viewer, and the private report seal refuses these
+      // carrier types anywhere else, losing the whole report. Apply that same
+      // carrier rule here; the cell archive still keeps the files.
+      if (!isStandardEvidenceFile(path.join("html-report", ...segments))) continue;
       const source = path.join(entry.directory, ...segments);
       const destination = path.join(output, ...baseSegments, ...segments);
       const didCopy = await mkdir(path.dirname(destination), {