diff --git a/scripts/ci/validate-content-policy.mjs b/scripts/ci/validate-content-policy.mjs
index cab99a42a7..0bf23b02db 100644
--- a/scripts/ci/validate-content-policy.mjs
+++ b/scripts/ci/validate-content-policy.mjs
@@ -364,6 +364,8 @@ function githubSourceRef(value) {
     if (url.hostname.toLowerCase() === "raw.githubusercontent.com") {
       if (parts.length < 4) return null;
       return {
+        owner: parts[0].toLowerCase(),
+        repo: parts[1].replace(/\.git$/i, "").toLowerCase(),
         ref: parts[2],
         path: parts.slice(3).join("/"),
       };
@@ -374,6 +376,8 @@ function githubSourceRef(value) {
       (parts[2] === "blob" || parts[2] === "raw")
     ) {
       return {
+        owner: parts[0].toLowerCase(),
+        repo: parts[1].replace(/\.git$/i, "").toLowerCase(),
         ref: parts[3],
         path: parts.slice(4).join("/"),
       };
@@ -388,13 +392,106 @@ function isScriptPath(value) {
   return /\.(?:sh|bash|zsh|ps1)$/i.test(normalizeText(value));
 }
 
-function isImmutableGithubScriptSourceUrl(value) {
-  const source = githubSourceRef(value);
-  return Boolean(
-    source &&
-    FULL_COMMIT_SHA_PATTERN.test(source.ref) &&
-    isScriptPath(source.path),
+function githubRepoRef(value) {
+  const raw = normalizeText(value);
+  if (!raw) return null;
+  try {
+    const url = new URL(raw);
+    if (
+      url.protocol !== "https:" ||
+      url.hostname.toLowerCase() !== "github.com"
+    ) {
+      return null;
+    }
+    const parts = url.pathname.split("/").filter(Boolean);
+    if (parts.length < 2) return null;
+    return {
+      owner: parts[0].toLowerCase(),
+      repo: parts[1].replace(/\.git$/i, "").toLowerCase(),
+    };
+  } catch {
+    return null;
+  }
+}
+
+function githubRepoKey(source) {
+  if (!source?.owner || !source?.repo) return "";
+  return `${source.owner}/${source.repo}`;
+}
+
+function collectGitCloneRepos(value) {
+  const text = normalizeText(value);
+  const repos = [];
+  const clonePattern =
+    /\bgit\s+clone\b[^\n;&|]*?(https:\/\/github\.com\/[^\s`'"<>]+|git@github\.com:[^\s`'"<>]+)/gi;
+  for (const match of text.matchAll(clonePattern)) {
+    const rawRepo = match[1].replace(
+      /^git@github\.com:/i,
+      "https://github.com/",
+    );
+    const repo = githubRepoRef(rawRepo);
+    if (repo) repos.push(repo);
+  }
+  return repos;
+}
+
+function normalizeScriptPath(value) {
+  return normalizeText(value)
+    .replace(/^['"`]+|['"`]+$/g, "")
+    .replace(/^(?:\.\.?\/)+/, "")
+    .replace(/\/{2,}/g, "/")
+    .toLowerCase();
+}
+
+function collectLocalScriptInstallRefs(value) {
+  const text = normalizeText(value);
+  const scriptPattern =
+    /(?:^|[\s`;&|])(?:(?:bash|sh|zsh|pwsh|powershell)\s+)?((?:\.{1,2}\/|[\w.-]+\/)?[\w./-]*(?:install|setup|start|bootstrap|init)[\w.-]*\.(?:sh|bash|zsh|ps1))\b/gim;
+  return [...text.matchAll(scriptPattern)]
+    .map((match) => ({
+      path: normalizeScriptPath(match[1]),
+      index: match.index ?? 0,
+    }))
+    .filter((script) => script.path);
+}
+
+function checkoutCommitIndex(value, commit) {
+  const escapedCommit = commit.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+  const match = normalizeText(value).match(
+    new RegExp(
+      `\\bgit\\s+(?:checkout|switch\\s+--detach)\\s+(?:[^\\n;&|]*\\s)?${escapedCommit}\\b`,
+      "i",
+    ),
+  );
+  return match?.index ?? -1;
+}
+
+function hasBoundImmutableGithubScriptEvidence(sourceUrls, installText) {
+  const clonedRepoKeys = new Set(
+    collectGitCloneRepos(installText).map(githubRepoKey),
   );
+  if (!clonedRepoKeys.size) return false;
+  const executedScripts = collectLocalScriptInstallRefs(installText);
+  if (!executedScripts.length) return false;
+
+  return sourceUrls.some((value) => {
+    const source = githubSourceRef(value);
+    if (
+      !source ||
+      !FULL_COMMIT_SHA_PATTERN.test(source.ref) ||
+      !isScriptPath(source.path) ||
+      !clonedRepoKeys.has(githubRepoKey(source))
+    ) {
+      return false;
+    }
+
+    const checkoutIndex = checkoutCommitIndex(installText, source.ref);
+    if (checkoutIndex < 0) return false;
+    const scriptPath = normalizeScriptPath(source.path);
+    return executedScripts.some(
+      (script) => script.path === scriptPath && checkoutIndex < script.index,
+    );
+  });
 }
 
 function isMutableGithubSourceUrl(value) {
@@ -735,7 +832,7 @@ function addContentRiskSignals(report, fields, content) {
 
   if (
     referencesClonedLocalScriptInstall(installText) &&
-    !submittedSourceUrls.some(isImmutableGithubScriptSourceUrl)
+    !hasBoundImmutableGithubScriptEvidence(submittedSourceUrls, installText)
   ) {
     const mutableSources = submittedSourceUrls.filter(isMutableGithubSourceUrl);
     addFlag(
diff --git a/tests/content-policy-validation.test.ts b/tests/content-policy-validation.test.ts
index 5e374b33e5..e4db01efe1 100644
--- a/tests/content-policy-validation.test.ts
+++ b/tests/content-policy-validation.test.ts
@@ -157,6 +157,136 @@ cd example-mcp
     );
   });
 
+  it("rejects unrelated immutable script evidence for cloned local scripts", () => {
+    const tmpDir = fs.mkdtempSync(
+      path.join(os.tmpdir(), "heyclaude-content-policy-"),
+    );
+    const unrelatedRevision = "0123456789abcdef0123456789abcdef01234567";
+    const content = `---
+title: Example MCP
+category: mcp
+description: Example MCP server with unrelated pinned script evidence.
+repoUrl: https://github.com/attacker/mutable-installer-poc
+installCommand: Clone the repository, then run ./start.sh.
+safetyNotes:
+  - Runs a local startup script from cloned source.
+sourceUrls:
+  - https://raw.githubusercontent.com/unrelated/benign/${unrelatedRevision}/scripts/safe.sh
+---
+
+Clone the repository and start the server:
+
+\`\`\`bash
+git clone https://github.com/attacker/mutable-installer-poc.git
+cd mutable-installer-poc
+./start.sh
+\`\`\`
+`;
+
+    const result = runContentPolicy(tmpDir, content, "same_repo_direct", [
+      {
+        filename: "content/mcp/example-mcp.mdx",
+        status: "added",
+        content,
+      },
+    ]);
+
+    expect(result.status).not.toBe(0);
+    const output = JSON.parse(fs.readFileSync(result.outputJson, "utf8"));
+    expect(output.reviewFlags).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ id: "mutable_script_install_source" }),
+      ]),
+    );
+  });
+
+  it("rejects immutable evidence for a different script path in the cloned repo", () => {
+    const tmpDir = fs.mkdtempSync(
+      path.join(os.tmpdir(), "heyclaude-content-policy-"),
+    );
+    const revision = "9845479d0aeb7523abaab85723d0dfcf832fe1d3";
+    const content = `---
+title: Example MCP
+category: mcp
+description: Example MCP server with pinned evidence for the wrong script.
+repoUrl: https://github.com/example/example-mcp
+installCommand: Clone the repository, check out reviewed commit ${revision}, then run ./docker-start.sh.
+safetyNotes:
+  - Runs a local Docker stack from cloned source.
+sourceUrls:
+  - https://raw.githubusercontent.com/example/example-mcp/${revision}/scripts/safe-start.sh
+---
+
+Clone the repository and start the stack:
+
+\`\`\`bash
+git clone https://github.com/example/example-mcp.git
+cd example-mcp
+git checkout ${revision}
+./docker-start.sh
+\`\`\`
+`;
+
+    const result = runContentPolicy(tmpDir, content, "same_repo_direct", [
+      {
+        filename: "content/mcp/example-mcp.mdx",
+        status: "added",
+        content,
+      },
+    ]);
+
+    expect(result.status).not.toBe(0);
+    const output = JSON.parse(fs.readFileSync(result.outputJson, "utf8"));
+    expect(output.reviewFlags).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ id: "mutable_script_install_source" }),
+      ]),
+    );
+  });
+
+  it("rejects immutable script evidence unless install instructions check out that commit", () => {
+    const tmpDir = fs.mkdtempSync(
+      path.join(os.tmpdir(), "heyclaude-content-policy-"),
+    );
+    const revision = "9845479d0aeb7523abaab85723d0dfcf832fe1d3";
+    const content = `---
+title: Example MCP
+category: mcp
+description: Example MCP server with a pinned script URL but mutable checkout.
+repoUrl: https://github.com/example/example-mcp
+installCommand: Clone the repository, then run ./docker-start.sh.
+safetyNotes:
+  - Runs a local Docker stack from cloned source.
+sourceUrls:
+  - https://raw.githubusercontent.com/example/example-mcp/${revision}/docker-start.sh
+---
+
+Clone the repository and start the stack:
+
+\`\`\`bash
+git clone https://github.com/example/example-mcp.git
+cd example-mcp
+./docker-start.sh
+\`\`\`
+`;
+
+    const result = runContentPolicy(tmpDir, content, "same_repo_direct", [
+      {
+        filename: "content/mcp/example-mcp.mdx",
+        status: "added",
+        content,
+      },
+    ]);
+
+    expect(result.status).not.toBe(0);
+    const output = JSON.parse(fs.readFileSync(result.outputJson, "utf8"));
+    expect(output.reviewFlags).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({ id: "mutable_script_install_source" }),
+      ]),
+    );
+  });
+
   it("allows cloned local scripts with immutable script source evidence", () => {
     const tmpDir = fs.mkdtempSync(
       path.join(os.tmpdir(), "heyclaude-content-policy-"),