diff --git a/packages/core/src/lint/hyperframeLinter.test.ts b/packages/core/src/lint/hyperframeLinter.test.ts
index ec18fd93d..e8dbaf35d 100644
--- a/packages/core/src/lint/hyperframeLinter.test.ts
+++ b/packages/core/src/lint/hyperframeLinter.test.ts
@@ -115,6 +115,7 @@ describe("lintHyperframeHtml", () => {
     const html = `<template id="rockets-template">
   <div data-composition-id="rockets" data-width="1920" data-height="1080">
     <div id="rocket-container"></div>
+    <script src="https://cdn.jsdelivr.net/npm/gsap@3/dist/gsap.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/lottie-web/5.12.2/lottie.min.js"></script>
     <script>
       window.__timelines = window.__timelines || {};
@@ -123,10 +124,11 @@ describe("lintHyperframeHtml", () => {
   </div>
 </template>`;
     const result = lintHyperframeHtml(html, { filePath: "compositions/rockets.html" });
-    const finding = result.findings.find((f) => f.code === "external_script_dependency");
+    const finding = result.findings.find(
+      (f) => f.code === "external_script_dependency" && f.message.includes("cdnjs.cloudflare.com"),
+    );
     expect(finding).toBeDefined();
     expect(finding?.severity).toBe("info");
-    expect(finding?.message).toContain("cdnjs.cloudflare.com");
     // info findings do not count as errors — ok should still be true
     expect(result.ok).toBe(true);
     expect(result.errorCount).toBe(0);
@@ -725,4 +727,145 @@ describe("template_literal_selector rule", () => {
     expect(finding).toBeDefined();
     expect(finding?.severity).toBe("warning");
   });
+
+  // ── Missing adapter library script checks ──────────────────────────────
+
+  it("reports error when GSAP is used without a GSAP script tag", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080"></div>
+  <script>
+    window.__timelines = window.__timelines || {};
+    const tl = gsap.timeline({ paused: true });
+    tl.to("#box", { x: 100, duration: 1 }, 0);
+    window.__timelines["main"] = tl;
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_gsap_script");
+    expect(finding).toBeDefined();
+    expect(finding?.severity).toBe("error");
+    expect(finding?.message).toContain("GSAP");
+  });
+
+  it("does not report missing_gsap_script when GSAP CDN script is present", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080"></div>
+  <script src="https://cdn.jsdelivr.net/npm/gsap@3/dist/gsap.min.js"></script>
+  <script>
+    window.__timelines = window.__timelines || {};
+    const tl = gsap.timeline({ paused: true });
+    tl.to("#box", { x: 100, duration: 1 }, 0);
+    window.__timelines["main"] = tl;
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_gsap_script");
+    expect(finding).toBeUndefined();
+  });
+
+  it("reports error when Lottie container exists without a Lottie script tag", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080">
+    <div id="lottie-player" data-lottie-src="animation.json"></div>
+  </div>
+  <script>
+    window.__timelines = window.__timelines || {};
+    window.__timelines["main"] = gsap.timeline({ paused: true });
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_lottie_script");
+    expect(finding).toBeDefined();
+    expect(finding?.severity).toBe("error");
+    expect(finding?.message).toContain("Lottie");
+  });
+
+  it("reports error when lottie.loadAnimation is used without a Lottie script tag", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080"></div>
+  <script>
+    window.__timelines = window.__timelines || {};
+    window.__timelines["main"] = gsap.timeline({ paused: true });
+    lottie.loadAnimation({ container: document.getElementById('lottie'), path: 'anim.json' });
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_lottie_script");
+    expect(finding).toBeDefined();
+    expect(finding?.severity).toBe("error");
+  });
+
+  it("does not report missing_lottie_script when Lottie CDN script is present", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080">
+    <div id="lottie-player" data-lottie-src="animation.json"></div>
+  </div>
+  <script src="https://cdn.jsdelivr.net/npm/lottie-web@5/build/player/lottie.min.js"></script>
+  <script>
+    window.__timelines = window.__timelines || {};
+    window.__timelines["main"] = gsap.timeline({ paused: true });
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_lottie_script");
+    expect(finding).toBeUndefined();
+  });
+
+  it("reports error when Three.js is used without a Three.js script tag", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080"></div>
+  <script>
+    window.__timelines = window.__timelines || {};
+    window.__timelines["main"] = gsap.timeline({ paused: true });
+    const scene = new THREE.Scene();
+    const renderer = new THREE.WebGLRenderer();
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_three_script");
+    expect(finding).toBeDefined();
+    expect(finding?.severity).toBe("error");
+    expect(finding?.message).toContain("Three.js");
+  });
+
+  it("does not report missing_three_script when Three.js CDN script is present", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080"></div>
+  <script src="https://cdn.jsdelivr.net/npm/three@0.160/build/three.min.js"></script>
+  <script>
+    window.__timelines = window.__timelines || {};
+    window.__timelines["main"] = gsap.timeline({ paused: true });
+    const scene = new THREE.Scene();
+    const renderer = new THREE.WebGLRenderer();
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const finding = result.findings.find((f) => f.code === "missing_three_script");
+    expect(finding).toBeUndefined();
+  });
+
+  it("does not report any adapter errors for composition with no adapter usage", () => {
+    const html = `
+<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080">
+    <div id="content">Hello World</div>
+  </div>
+  <script>
+    window.__timelines = window.__timelines || {};
+    window.__timelines["main"] = { totalDuration: function() { return 3; } };
+  </script>
+</body></html>`;
+    const result = lintHyperframeHtml(html);
+    const adapterFindings = result.findings.filter((f) =>
+      ["missing_gsap_script", "missing_lottie_script", "missing_three_script"].includes(f.code),
+    );
+    expect(adapterFindings).toHaveLength(0);
+  });
 });
diff --git a/packages/core/src/lint/hyperframeLinter.ts b/packages/core/src/lint/hyperframeLinter.ts
index 61ca8e58d..9efcf51a6 100644
--- a/packages/core/src/lint/hyperframeLinter.ts
+++ b/packages/core/src/lint/hyperframeLinter.ts
@@ -713,8 +713,6 @@ export function lintHyperframeHtml(
   // ── Caption lint rules ──────────────────────────────────────────────────
 
   // Rule: caption_exit_missing_hard_kill
-  // Exit tweens (tl.to with opacity: 0) can fail when karaoke word-level tweens
-  // conflict, leaving captions stuck on screen. A hard tl.set kill is needed.
   for (const script of scripts) {
     const content = script.content;
     const hasExitTween = /\.to\s*\([^,]+,\s*\{[^}]*opacity\s*:\s*0/.test(content);
@@ -737,8 +735,61 @@ export function lintHyperframeHtml(
     }
   }
 
+  // ── Missing adapter library script checks ───────────────────────────────
+  {
+    const allScriptTexts = scripts.filter((s) => !/\bsrc\s*=/.test(s.attrs)).map((s) => s.content);
+    const allScriptSrcs = scripts
+      .map((s) => readAttr(`<script ${s.attrs}>`, "src") || "")
+      .filter(Boolean);
+
+    const usesGsap = allScriptTexts.some((t) =>
+      /gsap\.(to|from|fromTo|timeline|set|registerPlugin)\b/.test(t),
+    );
+    const hasGsapScript = allScriptSrcs.some((src) => /gsap/i.test(src));
+
+    if (usesGsap && !hasGsapScript) {
+      pushFinding({
+        code: "missing_gsap_script",
+        severity: "error",
+        message: "Composition uses GSAP but no GSAP script is loaded. The animation will not run.",
+        fixHint:
+          'Add <script src="https://cdn.jsdelivr.net/npm/gsap@3/dist/gsap.min.js"></script> before your animation script.',
+      });
+    }
+
+    const hasLottieAttr = tags.some((t) => readAttr(t.raw, "data-lottie-src") !== null);
+    const usesLottieApi = allScriptTexts.some((t) =>
+      /lottie\.(loadAnimation|setSpeed|play|stop|destroy)\b/.test(t),
+    );
+    const hasLottieScript = allScriptSrcs.some((src) => /lottie/i.test(src));
+
+    if ((hasLottieAttr || usesLottieApi) && !hasLottieScript) {
+      pushFinding({
+        code: "missing_lottie_script",
+        severity: "error",
+        message:
+          "Composition uses Lottie but no Lottie script is loaded. The animation will not render.",
+        fixHint:
+          'Add <script src="https://cdn.jsdelivr.net/npm/lottie-web@5/build/player/lottie.min.js"></script> before your Lottie code.',
+      });
+    }
+
+    const usesThree = allScriptTexts.some((t) => /\bTHREE\./.test(t));
+    const hasThreeScript = allScriptSrcs.some((src) => /three/i.test(src));
+
+    if (usesThree && !hasThreeScript) {
+      pushFinding({
+        code: "missing_three_script",
+        severity: "error",
+        message:
+          "Composition uses Three.js but no Three.js script is loaded. The 3D scene will not render.",
+        fixHint:
+          'Add <script src="https://cdn.jsdelivr.net/npm/three@0.160/build/three.min.js"></script> before your Three.js code.',
+      });
+    }
+  }
+
   // Rule: caption_text_overflow_risk
-  // Captions with nowrap text and no max-width will clip off-screen.
   for (const style of styles) {
     const content = style.content;
     const captionBlocks = content.matchAll(
@@ -763,7 +814,6 @@ export function lintHyperframeHtml(
   }
 
   // Rule: caption_container_relative_position
-  // position: relative on caption containers causes overflow and stacking issues.
   for (const style of styles) {
     const content = style.content;
     const captionBlocks = content.matchAll(
