diff --git a/package.json b/package.json
index 0c3f342b..31b8fc94 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
     "trust:verify": "node --experimental-strip-types scripts/verify-trust-attestation.ts",
     "package:verify": "node --experimental-strip-types scripts/verify-package-signature.ts",
     "test": "npm run test:plain && npm run test:ts",
+    "test:security-headers": "node --experimental-strip-types --test tests/response-security.test.ts",
     "test:plain": "node --experimental-strip-types --test tests/adversarial-harness.test.ts tests/trust.test.ts tests/release-signing.test.ts tests/cli-install.test.ts tests/trust-attestation.test.ts",
     "test:ts": "node --experimental-strip-types --test tests/site-stats.test.ts tests/certify.test.ts tests/prompt-injection-guard.test.ts tests/audit-skills.test.ts tests/runtime.test.ts tests/integrations.test.ts tests/growth-revenue-split.test.ts tests/trust-badge.test.ts tests/bounties.test.ts tests/trust-scoring.test.ts tests/adversarial-holdout.test.ts tests/adversarial-judge.test.ts tests/paired-benchmark.test.ts tests/format-rubric.test.ts tests/lang-detect.test.ts tests/university.test.ts tests/package-signature.test.ts",
     "test:all": "node --experimental-strip-types --test tests/*.test.ts",
diff --git a/public/.well-known/security.txt b/public/.well-known/security.txt
new file mode 100644
index 00000000..1257081b
--- /dev/null
+++ b/public/.well-known/security.txt
@@ -0,0 +1,5 @@
+Contact: mailto:contact@zeroagency.ai
+Expires: 2027-04-28T00:00:00Z
+Canonical: https://superagentskill.com/.well-known/security.txt
+Preferred-Languages: en, pt-BR
+Policy: https://github.com/criptogus/agent-evolve-network/blob/main/SECURITY.md
diff --git a/src/components/site/JsonLd.tsx b/src/components/site/JsonLd.tsx
index 1c00f876..82217d01 100644
--- a/src/components/site/JsonLd.tsx
+++ b/src/components/site/JsonLd.tsx
@@ -1,11 +1,15 @@
+import { useRouter } from "@tanstack/react-router";
+
 interface JsonLdProps {
   data: Record<string, unknown> | Array<Record<string, unknown>>;
 }
 
 /** Renders a JSON-LD <script> tag. Safe to use on the client and during SSR. */
 export function JsonLd({ data }: JsonLdProps) {
+  const router = useRouter();
   return (
     <script
+      nonce={router.options.ssr?.nonce}
       type="application/ld+json"
       dangerouslySetInnerHTML={{ __html: JSON.stringify(data).replace(/</g, "\u003c") }}
     />
diff --git a/src/lib/csp-context.server.ts b/src/lib/csp-context.server.ts
new file mode 100644
index 00000000..685da96a
--- /dev/null
+++ b/src/lib/csp-context.server.ts
@@ -0,0 +1,5 @@
+import { AsyncLocalStorage } from "node:async_hooks";
+
+const storage = new AsyncLocalStorage<string>();
+export const withCspNonce = <T>(nonce: string, run: () => T): T => storage.run(nonce, run);
+export const requestCspNonce = () => storage.getStore();
diff --git a/src/lib/error-page.ts b/src/lib/error-page.ts
index 725235ce..73d62277 100644
--- a/src/lib/error-page.ts
+++ b/src/lib/error-page.ts
@@ -21,7 +21,7 @@ export function renderErrorPage(): string {
       <h1>This page didn't load</h1>
       <p>Something went wrong on our end. You can try refreshing or head back home.</p>
       <div class="actions">
-        <button class="primary" onclick="location.reload()">Try again</button>
+        <a class="primary" href="">Try again</a>
         <a class="secondary" href="/">Go home</a>
       </div>
     </div>
diff --git a/src/lib/response-security.server.ts b/src/lib/response-security.server.ts
new file mode 100644
index 00000000..493c162d
--- /dev/null
+++ b/src/lib/response-security.server.ts
@@ -0,0 +1,38 @@
+/** Keep browser sources scoped to integrations used by this app (not server-side APIs). */
+export function responseSecurity(response: Response, nonce: string, url: string): Response {
+  const headers = new Headers(response.headers);
+  const preview = new URL(url).hostname.endsWith(".lovable.app");
+  headers.set("X-Frame-Options", preview ? "SAMEORIGIN" : "DENY");
+  if (headers.get("content-type")?.includes("text/html")) {
+    headers.set(
+      "Content-Security-Policy",
+      [
+        "default-src 'self'",
+        // /~flock.js and /~api/analytics are same-origin Lovable proxies.
+        `script-src 'self' 'nonce-${nonce}' https://js.stripe.com https://challenges.cloudflare.com`,
+        "script-src-attr 'none'",
+        // React/Radix and charts use inline styles; scripts remain nonce-protected.
+        "style-src 'self' 'unsafe-inline' https://fonts.googleapis.com",
+        "font-src 'self' data: https://fonts.gstatic.com",
+        "img-src 'self' data: blob: https:",
+        "connect-src 'self' https://ynxuotbjfxkcrfvkrltr.supabase.co wss://ynxuotbjfxkcrfvkrltr.supabase.co https://api.stripe.com https://r.stripe.com https://m.stripe.network https://challenges.cloudflare.com https://auth.lovable.dev https://oauth.lovable.app",
+        "frame-src https://js.stripe.com https://hooks.stripe.com https://checkout.stripe.com https://challenges.cloudflare.com https://auth.lovable.dev https://oauth.lovable.app",
+        preview
+          ? "frame-ancestors 'self' https://lovable.dev https://*.lovable.dev"
+          : "frame-ancestors 'none'",
+        "worker-src 'self' blob:",
+        "base-uri 'self'",
+        "object-src 'none'",
+        "form-action 'self'",
+        "upgrade-insecure-requests",
+      ].join("; "),
+    );
+    // Never reuse a document's per-request nonce via a shared HTML cache.
+    headers.set("Cache-Control", "no-store");
+  }
+  return new Response(response.body, {
+    status: response.status,
+    statusText: response.statusText,
+    headers,
+  });
+}
diff --git a/src/routeTree.gen.ts b/src/routeTree.gen.ts
index 816517a8..b1917623 100644
--- a/src/routeTree.gen.ts
+++ b/src/routeTree.gen.ts
@@ -57,6 +57,7 @@ import { Route as WelcomeRouteImport } from './routes/welcome'
 import { Route as WhitepaperRouteImport } from './routes/whitepaper'
 import { Route as DotwellKnownOauthAuthorizationServerRouteImport } from './routes/[.]well-known.oauth-authorization-server'
 import { Route as DotwellKnownOauthProtectedResourceRouteImport } from './routes/[.]well-known.oauth-protected-resource'
+import { Route as DotwellKnownSecurityDottxtRouteImport } from './routes/[.]well-known.security[.]txt'
 import { Route as AccountAgentsRouteImport } from './routes/account.agents'
 import { Route as AccountBillingRouteImport } from './routes/account.billing'
 import { Route as AccountCloudSkillsRouteImport } from './routes/account.cloud-skills'
@@ -432,6 +433,12 @@ const DotwellKnownOauthProtectedResourceRoute =
     path: '/.well-known/oauth-protected-resource',
     getParentRoute: () => rootRouteImport,
   } as any)
+const DotwellKnownSecurityDottxtRoute =
+  DotwellKnownSecurityDottxtRouteImport.update({
+    id: '/.well-known/security.txt',
+    path: '/.well-known/security.txt',
+    getParentRoute: () => rootRouteImport,
+  } as any)
 const AccountAgentsRoute = AccountAgentsRouteImport.update({
   id: '/account/agents',
   path: '/account/agents',
@@ -1168,6 +1175,7 @@ export interface FileRoutesByFullPath {
   '/whitepaper': typeof WhitepaperRoute
   '/.well-known/oauth-authorization-server': typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   '/.well-known/oauth-protected-resource': typeof DotwellKnownOauthProtectedResourceRouteWithChildren
+  '/.well-known/security.txt': typeof DotwellKnownSecurityDottxtRoute
   '/account/agents': typeof AccountAgentsRoute
   '/account/billing': typeof AccountBillingRoute
   '/account/cloud-skills': typeof AccountCloudSkillsRoute
@@ -1349,6 +1357,7 @@ export interface FileRoutesByTo {
   '/whitepaper': typeof WhitepaperRoute
   '/.well-known/oauth-authorization-server': typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   '/.well-known/oauth-protected-resource': typeof DotwellKnownOauthProtectedResourceRouteWithChildren
+  '/.well-known/security.txt': typeof DotwellKnownSecurityDottxtRoute
   '/account/agents': typeof AccountAgentsRoute
   '/account/billing': typeof AccountBillingRoute
   '/account/cloud-skills': typeof AccountCloudSkillsRoute
@@ -1532,6 +1541,7 @@ export interface FileRoutesById {
   '/whitepaper': typeof WhitepaperRoute
   '/.well-known/oauth-authorization-server': typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   '/.well-known/oauth-protected-resource': typeof DotwellKnownOauthProtectedResourceRouteWithChildren
+  '/.well-known/security.txt': typeof DotwellKnownSecurityDottxtRoute
   '/account/agents': typeof AccountAgentsRoute
   '/account/billing': typeof AccountBillingRoute
   '/account/cloud-skills': typeof AccountCloudSkillsRoute
@@ -1716,6 +1726,7 @@ export interface FileRouteTypes {
     | '/whitepaper'
     | '/.well-known/oauth-authorization-server'
     | '/.well-known/oauth-protected-resource'
+    | '/.well-known/security.txt'
     | '/account/agents'
     | '/account/billing'
     | '/account/cloud-skills'
@@ -1897,6 +1908,7 @@ export interface FileRouteTypes {
     | '/whitepaper'
     | '/.well-known/oauth-authorization-server'
     | '/.well-known/oauth-protected-resource'
+    | '/.well-known/security.txt'
     | '/account/agents'
     | '/account/billing'
     | '/account/cloud-skills'
@@ -2079,6 +2091,7 @@ export interface FileRouteTypes {
     | '/whitepaper'
     | '/.well-known/oauth-authorization-server'
     | '/.well-known/oauth-protected-resource'
+    | '/.well-known/security.txt'
     | '/account/agents'
     | '/account/billing'
     | '/account/cloud-skills'
@@ -2262,6 +2275,7 @@ export interface RootRouteChildren {
   WhitepaperRoute: typeof WhitepaperRoute
   DotwellKnownOauthAuthorizationServerRoute: typeof DotwellKnownOauthAuthorizationServerRouteWithChildren
   DotwellKnownOauthProtectedResourceRoute: typeof DotwellKnownOauthProtectedResourceRouteWithChildren
+  DotwellKnownSecurityDottxtRoute: typeof DotwellKnownSecurityDottxtRoute
   AccountAgentsRoute: typeof AccountAgentsRoute
   AccountBillingRoute: typeof AccountBillingRoute
   AccountCloudSkillsRoute: typeof AccountCloudSkillsRoute
@@ -2696,6 +2710,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof DotwellKnownOauthProtectedResourceRouteImport
       parentRoute: typeof rootRouteImport
     }
+    '/.well-known/security.txt': {
+      id: '/.well-known/security.txt'
+      path: '/.well-known/security.txt'
+      fullPath: '/.well-known/security.txt'
+      preLoaderRoute: typeof DotwellKnownSecurityDottxtRouteImport
+      parentRoute: typeof rootRouteImport
+    }
     '/account/agents': {
       id: '/account/agents'
       path: '/account/agents'
@@ -3879,6 +3900,7 @@ const rootRouteChildren: RootRouteChildren = {
     DotwellKnownOauthAuthorizationServerRouteWithChildren,
   DotwellKnownOauthProtectedResourceRoute:
     DotwellKnownOauthProtectedResourceRouteWithChildren,
+  DotwellKnownSecurityDottxtRoute: DotwellKnownSecurityDottxtRoute,
   AccountAgentsRoute: AccountAgentsRoute,
   AccountBillingRoute: AccountBillingRoute,
   AccountCloudSkillsRoute: AccountCloudSkillsRoute,
diff --git a/src/router.tsx b/src/router.tsx
index 3423d598..1d56c8d7 100644
--- a/src/router.tsx
+++ b/src/router.tsx
@@ -2,7 +2,7 @@ import { QueryClient } from "@tanstack/react-query";
 import { createRouter } from "@tanstack/react-router";
 import { routeTree } from "./routeTree.gen";
 
-export const getRouter = () => {
+export const getRouter = async () => {
   const queryClient = new QueryClient();
 
   const router = createRouter({
@@ -12,5 +12,14 @@ export const getRouter = () => {
     defaultPreloadStaleTime: 0,
   });
 
+  if (import.meta.env.SSR) {
+    const { requestCspNonce } = await import("./lib/csp-context.server");
+    router.options.ssr = { ...router.options.ssr, nonce: requestCspNonce() };
+  } else {
+    router.options.ssr = {
+      ...router.options.ssr,
+      nonce: document.querySelector<HTMLScriptElement>("script[nonce]")?.nonce,
+    };
+  }
   return router;
 };
diff --git a/src/routes/[.]well-known.security[.]txt.ts b/src/routes/[.]well-known.security[.]txt.ts
new file mode 100644
index 00000000..87f0271f
--- /dev/null
+++ b/src/routes/[.]well-known.security[.]txt.ts
@@ -0,0 +1,18 @@
+import { createFileRoute } from "@tanstack/react-router";
+import securityTxt from "../../public/.well-known/security.txt?raw";
+
+// Explicit route as well as the public asset: dot directories may bypass static serving.
+export const Route = createFileRoute("/.well-known/security.txt")({
+  server: {
+    handlers: {
+      GET: () =>
+        new Response(securityTxt, {
+          headers: {
+            "Content-Type": "text/plain; charset=utf-8",
+            "Cache-Control": "public, max-age=3600",
+            "X-Content-Type-Options": "nosniff",
+          },
+        }),
+    },
+  },
+});
diff --git a/src/server.ts b/src/server.ts
index 11096a43..4b5f3e35 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -1,4 +1,6 @@
 import "./lib/error-capture";
+import { withCspNonce } from "./lib/csp-context.server";
+import { responseSecurity } from "./lib/response-security.server";
 
 import { consumeLastCapturedError } from "./lib/error-capture";
 import { renderErrorPage } from "./lib/error-page";
@@ -100,7 +102,7 @@ function withTimeout<T>(promise: Promise<T>, ms: number): Promise<T | "__timeout
   ]);
 }
 
-export default {
+const server = {
   async fetch(request: Request, env: unknown, ctx: unknown) {
     try {
       const redirect = canonicalRedirect(request);
@@ -130,3 +132,12 @@ export default {
     }
   },
 };
+
+export default {
+  async fetch(request: Request, env: unknown, ctx: unknown) {
+    const nonce = btoa(String.fromCharCode(...crypto.getRandomValues(new Uint8Array(24))));
+    return withCspNonce(nonce, async () =>
+      responseSecurity(await server.fetch(request, env, ctx), nonce, request.url),
+    );
+  },
+};
diff --git a/tests/response-security.test.ts b/tests/response-security.test.ts
new file mode 100644
index 00000000..ad13414b
--- /dev/null
+++ b/tests/response-security.test.ts
@@ -0,0 +1,87 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import { responseSecurity } from "../src/lib/response-security.server.ts";
+import { withCspNonce, requestCspNonce } from "../src/lib/csp-context.server.ts";
+
+const html = () =>
+  new Response("<html></html>", {
+    status: 503,
+    headers: { "Content-Type": "text/html; charset=utf-8", "Retry-After": "5" },
+  });
+
+test("HTML gets nonce CSP, denies framing, and cannot be cached", async () => {
+  const response = responseSecurity(html(), "test-nonce", "https://superagentskill.com/");
+  const csp = response.headers.get("Content-Security-Policy")!;
+  assert.match(csp, /script-src 'self' 'nonce-test-nonce'/);
+  assert.match(csp, /script-src-attr 'none'/);
+  assert.match(csp, /frame-ancestors 'none'/);
+  assert.match(csp, /https:\/\/js.stripe.com/);
+  assert.match(csp, /wss:\/\/ynxuotbjfxkcrfvkrltr.supabase.co/);
+  assert.doesNotMatch(
+    csp.split(";").find((d) => d.trim().startsWith("script-src "))!,
+    /unsafe-inline|unsafe-eval/,
+  );
+  assert.equal(response.headers.get("X-Frame-Options"), "DENY");
+  assert.equal(response.headers.get("Cache-Control"), "no-store");
+  assert.equal(response.status, 503);
+  assert.equal(response.headers.get("Retry-After"), "5");
+  assert.equal(await response.text(), "<html></html>");
+});
+
+test("only actual Lovable previews allow the editor's framing origins", () => {
+  for (const host of [
+    "preview.lovable.app",
+    "superagentskill.com",
+    "preview.lovable.app.evil.test",
+  ]) {
+    const response = responseSecurity(html(), "nonce", `https://${host}/`);
+    const preview = host === "preview.lovable.app";
+    assert.equal(response.headers.get("X-Frame-Options"), preview ? "SAMEORIGIN" : "DENY");
+    assert.equal(
+      response.headers.get("Content-Security-Policy")!.includes("https://*.lovable.dev"),
+      preview,
+    );
+  }
+});
+
+test("JSON, redirects, and empty responses retain their semantics", async () => {
+  for (const response of [
+    Response.json({ ok: true }),
+    Response.redirect("https://superagentskill.com"),
+    new Response(null, { status: 204 }),
+  ]) {
+    const expectedBody = await response.clone().text();
+    const secured = responseSecurity(response, "nonce", "https://superagentskill.com/");
+    assert.equal(secured.headers.get("Content-Security-Policy"), null);
+    assert.equal(secured.status, response.status);
+    assert.equal(secured.headers.get("X-Frame-Options"), "DENY");
+    assert.equal(await secured.text(), expectedBody);
+  }
+});
+
+test("concurrent async request contexts keep their nonce isolated", async () => {
+  assert.equal(requestCspNonce(), undefined);
+  await Promise.all(
+    ["first", "second"].map((nonce) =>
+      withCspNonce(nonce, async () => {
+        await new Promise((resolve) => setTimeout(resolve, 5));
+        assert.equal(requestCspNonce(), nonce);
+      }),
+    ),
+  );
+  assert.equal(requestCspNonce(), undefined);
+});
+
+test("disclosure document has the published contact and a bounded expiry", async () => {
+  const body = await readFile(
+    new URL("../public/.well-known/security.txt", import.meta.url),
+    "utf8",
+  );
+  assert.match(body, /^Contact: mailto:contact@zeroagency.ai$/m);
+  assert.match(body, /^Canonical: https:\/\/superagentskill.com\/\.well-known\/security.txt$/m);
+  assert.match(body, /^Preferred-Languages: en, pt-BR$/m);
+  const expires = Date.parse(body.match(/^Expires: (.+)$/m)![1]);
+  assert.ok(expires > Date.now());
+  assert.ok(expires < Date.now() + 365 * 24 * 60 * 60 * 1000);
+});