diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index dcd07a3..6049a59 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1,277 +1,158 @@
 import { useEffect, useMemo, useState } from "react";
 import {
   callSkill,
-  fileToBrowserDocument,
   loadAgentConfig,
   loadSession,
-  maybeAuthorize,
+  sampleArgs,
   signInUrl,
 } from "./a2a.js";
 
-const MAX_FILE_BYTES = 64 * 1024;
-const MAX_FILES = 4;
-const ACCEPT = ".json,.csv,.txt,application/json,text/csv,text/plain";
-
-const SUCCESS_FIXTURE = [
-  { vendor: "Acme Bearings", quantity: 500, unit_price: 10.75, delivery_days: 12, warranty_months: 12 },
-  { vendor: "Beta Industrial", quantity: 500, unit_price: 9.1, delivery_days: 8, warranty_months: 18 },
-];
-
-const EMPTY_QUOTE = { vendor: "", quantity: 1, unit_price: 0, delivery_days: 0, warranty_months: 0 };
-const DEFAULT_WEIGHTS = { price: 50, delivery: 30, warranty: 20 };
-
 export function App() {
   const [config, setConfig] = useState(null);
   const [session, setSession] = useState(null);
-  const [loadError, setLoadError] = useState(null);
-  const [comparisonId, setComparisonId] = useState("studio-quote-v1");
-  const [quotes, setQuotes] = useState(SUCCESS_FIXTURE);
-  const [weights, setWeights] = useState(DEFAULT_WEIGHTS);
-  const [files, setFiles] = useState([]);
+  const [selectedSkillName, setSelectedSkillName] = useState("");
+  const [argsText, setArgsText] = useState("{}");
   const [result, setResult] = useState(null);
-  const [historyResult, setHistoryResult] = useState(null);
   const [error, setError] = useState(null);
   const [running, setRunning] = useState(false);
 
   useEffect(() => {
     loadAgentConfig()
-      .then(async (data) => {
+      .then((data) => {
         setConfig(data);
-        try {
-          setSession(await loadSession(data));
-        } catch {
-          setSession({ authenticated: false });
+        const firstSkill = data.skills?.[0];
+        if (firstSkill) {
+          setSelectedSkillName(firstSkill.name);
+          setArgsText(JSON.stringify(sampleArgs(firstSkill), null, 2));
         }
+        return loadSession(data).catch(() => null);
       })
-      .catch((err) => setLoadError(err.message || String(err)));
+      .then((sessionData) => setSession(sessionData))
+      .catch((err) => setError(err.message || String(err)));
   }, []);
 
-  const needsSignIn = Boolean(config?.auth?.invokeRequiresSession && session && !session.authenticated);
-  const signInHref = useMemo(() => (config ? signInUrl(config) : null), [config]);
-  const totalWeight = Number(weights.price || 0) + Number(weights.delivery || 0) + Number(weights.warranty || 0);
+  const selectedSkill = useMemo(
+    () => config?.skills?.find((skill) => skill.name === selectedSkillName),
+    [config, selectedSkillName],
+  );
 
-  function updateQuote(index, field, value) {
-    setQuotes((current) => current.map((quote, i) => (i === index ? { ...quote, [field]: value } : quote)));
+  const needsSignIn = Boolean(
+    config?.auth?.invokeRequiresSession && session && !session.authenticated,
+  );
+  const signInHref = useMemo(
+    () => (config && needsSignIn ? signInUrl(config) : null),
+    [config, needsSignIn],
+  );
+
+  function selectSkill(skill) {
+    setSelectedSkillName(skill.name);
+    setArgsText(JSON.stringify(sampleArgs(skill), null, 2));
+    setResult(null);
+    setError(null);
   }
 
-  function addQuote() {
-    if (quotes.length < 10) setQuotes((current) => [...current, { ...EMPTY_QUOTE }]);
-  }
-
-  function removeQuote(index) {
-    setQuotes((current) => current.filter((_, i) => i !== index));
-  }
-
-  function normalizeQuotes() {
-    return quotes.map((quote) => ({
-      vendor: String(quote.vendor || "").trim(),
-      quantity: Number(quote.quantity),
-      unit_price: Number(quote.unit_price),
-      delivery_days: Number(quote.delivery_days),
-      warranty_months: Number(quote.warranty_months),
-    }));
-  }
-
-  async function runCompare(event) {
+  async function runSkill(event) {
     event.preventDefault();
-    if (!config) return;
-    if (needsSignIn) return maybeAuthorize(config);
+    if (!config || !selectedSkill) return;
     setRunning(true);
     setError(null);
     setResult(null);
     try {
-      let data;
-      if (files.length) {
-        const docs = await Promise.all(files.map(fileToBrowserDocument));
-        data = await callSkill(config, "compare_quotes_from_browser_upload", {
-          comparison_id: comparisonId,
-          documents: docs,
-          weights: coerceWeights(weights),
-        });
-      } else {
-        data = await callSkill(config, "compare_quotes", {
-          comparison_id: comparisonId,
-          quotes: normalizeQuotes(),
-          weights: coerceWeights(weights),
-        });
-      }
-      if (!data.ok) setError(data.code || "Quote comparison failed validation.");
+      const args = JSON.parse(argsText || "{}");
+      const data = await callSkill(config, selectedSkill.name, args);
       setResult(data);
     } catch (err) {
-      if (err.status === 401) return maybeAuthorize(config);
       setError(err.message || String(err));
     } finally {
       setRunning(false);
     }
   }
 
-  async function reloadComparison() {
-    if (!config) return;
-    if (needsSignIn) return maybeAuthorize(config);
-    setRunning(true);
-    setError(null);
-    try {
-      const data = await callSkill(config, "get_comparison", { comparison_id: comparisonId });
-      if (!data.ok) setError(data.code || "Comparison not found.");
-      setHistoryResult(data);
-      if (data.ok) setResult(data);
-    } catch (err) {
-      if (err.status === 401) return maybeAuthorize(config);
-      setError(err.message || String(err));
-    } finally {
-      setRunning(false);
-    }
+  if (!config) {
+    return (
+      <main className="loading">
+        <p>{error || "Loading A2A agent contract..."}</p>
+      </main>
+    );
   }
 
-  function useFixture(kind) {
-    setFiles([]);
-    setComparisonId(kind === "failure" ? "studio-quote-invalid" : "studio-quote-v1");
-    setQuotes(kind === "failure" ? [
-      { vendor: "Only Vendor", quantity: 1, unit_price: 10, delivery_days: 5, warranty_months: 6 },
-    ] : SUCCESS_FIXTURE);
-    setWeights(DEFAULT_WEIGHTS);
-    setResult(null);
-    setHistoryResult(null);
-    setError(null);
-  }
-
-  function onFilesSelected(event) {
-    const picked = Array.from(event.target.files || []);
-    const tooLarge = picked.find((file) => file.size > MAX_FILE_BYTES);
-    if (picked.length > MAX_FILES) return setError(`Upload at most ${MAX_FILES} files.`);
-    if (tooLarge) return setError(`${tooLarge.name} exceeds 64 KiB.`);
-    setFiles(picked);
-    setError(null);
-  }
-
-  if (loadError) return <main className="loading"><p>{loadError}</p></main>;
-  if (!config) return <main className="loading"><p>Loading QuoteJudge...</p></main>;
-
   return (
     <main className="app-shell">
-      <header className="hero">
-        <nav className="topbar" aria-label="QuoteJudge status">
-          <div>
-            <span className="logo">QJ</span>
-            <strong>QuoteJudge Studio</strong>
-          </div>
-          <div className="session-pill">
-            {session?.authenticated ? "Signed in" : "Signed out"}
-            {needsSignIn && signInHref ? <a href={signInHref}>Sign in to run</a> : null}
-          </div>
-        </nav>
-        <section className="hero-grid">
-          <div>
-            <p className="eyebrow">Weighted vendor quote decisions</p>
-            <h1>Pick the best quote, save the evidence, reopen it later.</h1>
-            <p className="lede">
-              Upload or paste supplier quotes, tune price/delivery/warranty weights, and persist a per-user production receipt without sending secrets to the browser.
-            </p>
-            <div className="actions">
-              <button type="button" onClick={() => useFixture("success")}>Load success fixture</button>
-              <button type="button" className="secondary" onClick={() => useFixture("failure")}>Load failure fixture</button>
-              <button type="button" className="secondary" onClick={reloadComparison} disabled={running}>Reopen saved</button>
-            </div>
-          </div>
-          <div className="score-card" aria-live="polite">
-            <span>Current recommendation</span>
-            <strong>{result?.recommendation?.vendor || "Run a comparison"}</strong>
-            <p>{result?.recommendation?.rationale || "Beta wins the bundled fixture because it is cheaper, faster, and has a longer warranty."}</p>
-          </div>
-        </section>
-      </header>
+      <aside className="sidebar">
+        <div>
+          <p className="eyebrow">A2A packed app</p>
+          <h1>quote-judge-studio-v1</h1>
+          <p className="agent-meta">
+            {config.agent.name} v{config.agent.version}
+          </p>
+        </div>
 
-      <form className="studio" onSubmit={runCompare}>
-        <section className="panel inputs-panel">
-          <div className="section-title">
-            <div>
-              <p className="eyebrow">1. Quote data</p>
-              <h2>Paste quotes or upload a file</h2>
-            </div>
-            <label className="id-label">
-              Comparison ID
-              <input value={comparisonId} onChange={(event) => setComparisonId(event.target.value)} />
-            </label>
-          </div>
-
-          <div className="upload-box">
-            <label>
-              Browser upload bridge (JSON/CSV/text, 64 KiB each)
-              <input type="file" accept={ACCEPT} multiple onChange={onFilesSelected} />
-            </label>
-            <small>{files.length ? files.map((file) => file.name).join(", ") : "No file selected; form rows below will be used."}</small>
-          </div>
-
-          <div className="quotes-table" role="group" aria-label="Vendor quotes">
-            {quotes.map((quote, index) => (
-              <div className="quote-row" key={index}>
-                <label>Vendor<input value={quote.vendor} onChange={(e) => updateQuote(index, "vendor", e.target.value)} /></label>
-                <label>Qty<input type="number" min="1" value={quote.quantity} onChange={(e) => updateQuote(index, "quantity", e.target.value)} /></label>
-                <label>Unit price<input type="number" min="0" step="0.01" value={quote.unit_price} onChange={(e) => updateQuote(index, "unit_price", e.target.value)} /></label>
-                <label>Days<input type="number" min="0" value={quote.delivery_days} onChange={(e) => updateQuote(index, "delivery_days", e.target.value)} /></label>
-                <label>Warranty<input type="number" min="0" value={quote.warranty_months} onChange={(e) => updateQuote(index, "warranty_months", e.target.value)} /></label>
-                <button type="button" className="icon" onClick={() => removeQuote(index)} aria-label={`Remove quote ${index + 1}`}>×</button>
-              </div>
-            ))}
-          </div>
-          <button type="button" className="secondary" onClick={addQuote} disabled={quotes.length >= 10}>Add quote</button>
-        </section>
-
-        <section className="panel weights-panel">
-          <p className="eyebrow">2. Decision weights</p>
-          <h2>Score priorities</h2>
-          {Object.keys(DEFAULT_WEIGHTS).map((key) => (
-            <label className="slider" key={key}>
-              <span>{key} <strong>{weights[key]}</strong></span>
-              <input type="range" min="0" max="100" value={weights[key]} onChange={(e) => setWeights((w) => ({ ...w, [key]: Number(e.target.value) }))} />
-            </label>
+        <nav className="skill-list" aria-label="Agent skills">
+          {(config.skills || []).map((skill) => (
+            <button
+              className={skill.name === selectedSkillName ? "skill active" : "skill"}
+              key={skill.name}
+              onClick={() => selectSkill(skill)}
+              type="button"
+            >
+              <span>{skill.name}</span>
+              <small>{skill.stream ? "streaming" : "request"}</small>
+            </button>
           ))}
-          <p className={totalWeight > 0 ? "hint" : "hint danger"}>Total weight: {totalWeight}. At least one priority must be non-zero.</p>
-          {needsSignIn ? <a className="primary-link" href={signInHref || "#"}>Sign in to run comparisons</a> : (
-            <button className="primary" type="submit" disabled={running || totalWeight <= 0}>{running ? "Comparing..." : "Compare and save"}</button>
-          )}
-        </section>
-      </form>
+        </nav>
 
-      {error ? <section className="alert" role="alert">{error}</section> : null}
+        <div className="session">
+          <span>{session?.authenticated ? "Signed in" : needsSignIn ? "Signed out" : "Local session"}</span>
+          <strong>{session?.user?.email || session?.org?.slug || "dev@example.local"}</strong>
+          {/* Skills that spend the caller's LLM budget need a signed-in
+              visitor even when the page itself is public, so offer the way in
+              rather than failing at the first click. */}
+          {needsSignIn && signInHref ? (
+            <a className="signin" href={signInHref}>Sign in to run</a>
+          ) : null}
+        </div>
+      </aside>
 
-      <section className="results-grid">
-        <ResultPanel result={result} />
-        <section className="panel">
-          <p className="eyebrow">Durable reload</p>
-          <h2>Saved comparison</h2>
-          <button type="button" className="secondary" onClick={reloadComparison} disabled={running}>Get {comparisonId}</button>
-          <pre>{JSON.stringify(historyResult || { message: "Run compare, then reopen the same ID in a later invocation." }, null, 2)}</pre>
+      <section className="workbench">
+        <header className="toolbar">
+          <div>
+            <p className="eyebrow">Skill runner</p>
+            <h2>{selectedSkill?.name || "No skills found"}</h2>
+          </div>
+          <a href={config.docs.base} rel="noreferrer" target="_blank">
+            Docs
+          </a>
+        </header>
+
+        {selectedSkill ? (
+          <form className="runner" onSubmit={runSkill}>
+            <label>
+              Arguments JSON
+              <textarea
+                spellCheck="false"
+                value={argsText}
+                onChange={(event) => setArgsText(event.target.value)}
+              />
+            </label>
+            <button disabled={running} type="submit">
+              {running ? "Running..." : `Run ${selectedSkill.name}`}
+            </button>
+          </form>
+        ) : (
+          <p className="empty">Add a `@a2a.tool` to your agent to make it callable here.</p>
+        )}
+
+        <section className="panels">
+          <div className="panel">
+            <h3>Input schema</h3>
+            <pre>{JSON.stringify(selectedSkill?.input_schema || {}, null, 2)}</pre>
+          </div>
+          <div className="panel">
+            <h3>Result</h3>
+            <pre>{error || JSON.stringify(result, null, 2) || "No run yet."}</pre>
+          </div>
         </section>
       </section>
     </main>
   );
 }
-
-function ResultPanel({ result }) {
-  return (
-    <section className="panel">
-      <p className="eyebrow">3. Result and receipt</p>
-      <h2>{result?.ok ? "Comparison saved" : "No saved result yet"}</h2>
-      {result?.rankings?.length ? (
-        <ol className="rankings">
-          {result.rankings.map((row) => (
-            <li key={row.vendor}>
-              <strong>#{row.rank} {row.vendor}</strong>
-              <span>Score {row.score} · BRL {row.total_price} · {row.delivery_days} days · {row.warranty_months} mo warranty</span>
-            </li>
-          ))}
-        </ol>
-      ) : null}
-      <pre>{JSON.stringify(result || { message: "Results from the live backend appear here." }, null, 2)}</pre>
-    </section>
-  );
-}
-
-function coerceWeights(weights) {
-  return {
-    price: Number(weights.price),
-    delivery: Number(weights.delivery),
-    warranty: Number(weights.warranty),
-  };
-}