diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index 5c31913..6049a59 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1,339 +1,157 @@
 import { useEffect, useMemo, useState } from "react";
-import { callSkill, fileToBrowserDocument, loadAgentConfig, loadSession, signInUrl } from "./a2a.js";
-
-const DEFAULT_QUOTES = [
-  { 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 DEFAULT_WEIGHTS = { price: 50, delivery: 30, warranty: 20 };
-
-function blankQuote() {
-  return { vendor: "", quantity: 1, unit_price: 0, delivery_days: 0, warranty_months: 0 };
-}
-
-function normalizeQuote(quote) {
-  return {
-    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),
-  };
-}
-
-function parsePastedQuotes(text) {
-  const trimmed = text.trim();
-  if (!trimmed) return [];
-  try {
-    const parsed = JSON.parse(trimmed);
-    const rows = Array.isArray(parsed) ? parsed : parsed.quotes;
-    if (Array.isArray(rows)) return rows.map(normalizeQuote);
-  } catch {
-    // Fall through to CSV-ish parsing.
-  }
-  const lines = trimmed.split(/\r?\n/).filter(Boolean);
-  const hasHeader = /vendor|supplier/i.test(lines[0] || "");
-  const rows = hasHeader ? lines.slice(1) : lines;
-  return rows.map((line) => {
-    const parts = line.split(/[,;|\t]/).map((part) => part.trim());
-    return normalizeQuote({
-      vendor: parts[0],
-      quantity: parts[1],
-      unit_price: parts[2],
-      delivery_days: parts[3],
-      warranty_months: parts[4],
-    });
-  });
-}
-
-function validateQuotes(quotes, weights) {
-  const complete = quotes.map(normalizeQuote).filter((quote) => quote.vendor);
-  if (complete.length < 2) return "Add at least two vendor quotes before comparing.";
-  for (const quote of complete) {
-    if (!Number.isFinite(quote.quantity) || quote.quantity <= 0) return `${quote.vendor}: quantity must be greater than 0.`;
-    if (!Number.isFinite(quote.unit_price) || quote.unit_price < 0) return `${quote.vendor}: unit price must be 0 or greater.`;
-    if (!Number.isFinite(quote.delivery_days) || quote.delivery_days < 0) return `${quote.vendor}: delivery days must be 0 or greater.`;
-    if (!Number.isFinite(quote.warranty_months) || quote.warranty_months < 0) return `${quote.vendor}: warranty must be 0 or greater.`;
-  }
-  const totalWeight = Number(weights.price) + Number(weights.delivery) + Number(weights.warranty);
-  if (!Number.isFinite(totalWeight) || totalWeight <= 0) return "Set at least one positive weight.";
-  return null;
-}
+import {
+  callSkill,
+  loadAgentConfig,
+  loadSession,
+  sampleArgs,
+  signInUrl,
+} from "./a2a.js";
 
 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(DEFAULT_QUOTES);
-  const [weights, setWeights] = useState(DEFAULT_WEIGHTS);
-  const [pasteText, setPasteText] = useState("");
+  const [selectedSkillName, setSelectedSkillName] = useState("");
+  const [argsText, setArgsText] = useState("{}");
   const [result, setResult] = useState(null);
-  const [history, setHistory] = useState([]);
-  const [status, setStatus] = useState("");
-  const [error, setError] = useState("");
+  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)));
   }, []);
 
-  useEffect(() => {
-    try {
-      const saved = JSON.parse(window.localStorage.getItem("quotejudge.history") || "[]");
-      if (Array.isArray(saved)) setHistory(saved.slice(0, 8));
-    } catch {
-      setHistory([]);
-    }
-  }, []);
+  const selectedSkill = useMemo(
+    () => config?.skills?.find((skill) => skill.name === selectedSkillName),
+    [config, selectedSkillName],
+  );
 
-  const needsSignIn = Boolean(config?.auth?.invokeRequiresSession && session && !session.authenticated);
-  const authHref = useMemo(() => (config ? signInUrl(config) : null), [config]);
-  const validation = validateQuotes(quotes, weights);
-  const totalWeight = Number(weights.price) + Number(weights.delivery) + Number(weights.warranty);
+  const needsSignIn = Boolean(
+    config?.auth?.invokeRequiresSession && session && !session.authenticated,
+  );
+  const signInHref = useMemo(
+    () => (config && needsSignIn ? signInUrl(config) : null),
+    [config, needsSignIn],
+  );
 
-  function updateQuote(index, field, value) {
-    setQuotes((current) => current.map((quote, i) => (i === index ? { ...quote, [field]: value } : quote)));
+  function selectSkill(skill) {
+    setSelectedSkillName(skill.name);
+    setArgsText(JSON.stringify(sampleArgs(skill), null, 2));
+    setResult(null);
+    setError(null);
   }
 
-  function remember(id) {
-    const next = [id, ...history.filter((item) => item !== id)].slice(0, 8);
-    setHistory(next);
-    window.localStorage.setItem("quotejudge.history", JSON.stringify(next));
-  }
-
-  function applyPastedQuotes() {
-    setError("");
-    try {
-      const parsed = parsePastedQuotes(pasteText);
-      if (parsed.length < 2) {
-        setError("Paste JSON, CSV, or pipe-separated text with at least two quotes.");
-        return;
-      }
-      setQuotes(parsed);
-      setStatus(`Loaded ${parsed.length} pasted quotes.`);
-    } catch (err) {
-      setError(err.message || "Could not parse pasted quotes.");
-    }
-  }
-
-  async function compare(event) {
+  async function runSkill(event) {
     event.preventDefault();
-    if (!config) return;
-    setError("");
-    setStatus("");
-    const message = validateQuotes(quotes, weights);
-    if (message) {
-      setError(message);
-      return;
-    }
+    if (!config || !selectedSkill) return;
     setRunning(true);
+    setError(null);
+    setResult(null);
     try {
-      const data = await callSkill(config, "compare_quotes", {
-        comparison_id: comparisonId,
-        quotes: quotes.map(normalizeQuote).filter((quote) => quote.vendor),
-        weights: {
-          price: Number(weights.price),
-          delivery: Number(weights.delivery),
-          warranty: Number(weights.warranty),
-        },
-      });
+      const args = JSON.parse(argsText || "{}");
+      const data = await callSkill(config, selectedSkill.name, args);
       setResult(data);
-      if (data.ok) {
-        remember(data.comparison_id);
-        setStatus("Comparison saved. You can refresh and reopen it by ID.");
-      } else {
-        setError(data.message || data.code || "Comparison failed.");
-      }
-    } catch (err) {
-      if (err.status === 401 && authHref) setError("Session expired. Sign in again to run QuoteJudge.");
-      else setError(err.message || String(err));
-    } finally {
-      setRunning(false);
-    }
-  }
-
-  async function reopen(id = comparisonId) {
-    if (!config || !id) return;
-    setRunning(true);
-    setError("");
-    setStatus("");
-    try {
-      const data = await callSkill(config, "get_comparison", { comparison_id: id });
-      setResult(data);
-      setComparisonId(id);
-      if (data.ok) {
-        remember(id);
-        setStatus("Saved comparison reopened from managed Postgres.");
-      } else {
-        setError(data.message || "No saved comparison found for this ID.");
-      }
-    } catch (err) {
-      if (err.status === 401 && authHref) setError("Session expired. Sign in again to reopen comparisons.");
-      else setError(err.message || String(err));
-    } finally {
-      setRunning(false);
-    }
-  }
-
-  async function handleFiles(event) {
-    if (!config) return;
-    const files = Array.from(event.target.files || []);
-    if (!files.length) return;
-    setRunning(true);
-    setError("");
-    setStatus("");
-    try {
-      const documents = await Promise.all(files.map((file) => fileToBrowserDocument(file)));
-      const data = await callSkill(config, "compare_uploaded_quotes_browser", {
-        comparison_id: comparisonId,
-        documents,
-        weights: {
-          price: Number(weights.price),
-          delivery: Number(weights.delivery),
-          warranty: Number(weights.warranty),
-        },
-      });
-      setResult(data);
-      if (data.ok) {
-        setQuotes(data.quotes.map(({ vendor, quantity, unit_price, delivery_days, warranty_months }) => ({ vendor, quantity, unit_price, delivery_days, warranty_months })));
-        remember(data.comparison_id);
-        setStatus("Uploaded quotes parsed, compared, and saved.");
-      } else {
-        setError(data.message || data.code || "Upload comparison failed.");
-      }
     } catch (err) {
       setError(err.message || String(err));
     } finally {
-      event.target.value = "";
       setRunning(false);
     }
   }
 
   if (!config) {
-    return <main className="loading"><p>{loadError || "Loading QuoteJudge…"}</p></main>;
+    return (
+      <main className="loading">
+        <p>{error || "Loading A2A agent contract..."}</p>
+      </main>
+    );
   }
 
   return (
     <main className="app-shell">
-      <section className="hero card">
+      <aside className="sidebar">
         <div>
-          <p className="eyebrow">QuoteJudge Studio</p>
-          <h1>Pick the best vendor quote with weighted, auditable scoring.</h1>
-          <p className="lede">Upload or paste quotes, tune price/delivery/warranty importance, save the comparison, and reopen it after refresh. Results are calculated by typed A2A backend tools and stored per signed-in user.</p>
+          <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>
-        <div className="session-box">
-          <span className={session?.authenticated ? "dot ok" : "dot warn"} />
+
+        <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>
+          ))}
+        </nav>
+
+        <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="workbench">
+        <header className="toolbar">
           <div>
-            <strong>{session?.authenticated ? "Signed in" : "Sign-in required to run"}</strong>
-            <p>{session?.user?.email || session?.org?.slug || "Platform auth protects saved comparisons."}</p>
+            <p className="eyebrow">Skill runner</p>
+            <h2>{selectedSkill?.name || "No skills found"}</h2>
           </div>
-          {needsSignIn && authHref ? <a className="button secondary" href={authHref}>Sign in</a> : null}
-        </div>
-      </section>
+          <a href={config.docs.base} rel="noreferrer" target="_blank">
+            Docs
+          </a>
+        </header>
 
-      <form className="grid" onSubmit={compare}>
-        <section className="card editor">
-          <div className="section-head">
-            <div>
-              <p className="eyebrow">Inputs</p>
-              <h2>Vendor quotes</h2>
-            </div>
-            <button type="button" className="button ghost" onClick={() => setQuotes((rows) => [...rows, blankQuote()])}>Add quote</button>
-          </div>
-
-          <label className="field id-field">Comparison ID
-            <input value={comparisonId} onChange={(e) => setComparisonId(e.target.value)} placeholder="studio-quote-v1" />
-          </label>
-
-          <div className="quote-list">
-            {quotes.map((quote, index) => (
-              <article 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>Delivery days<input type="number" min="0" value={quote.delivery_days} onChange={(e) => updateQuote(index, "delivery_days", e.target.value)} /></label>
-                <label>Warranty months<input type="number" min="0" value={quote.warranty_months} onChange={(e) => updateQuote(index, "warranty_months", e.target.value)} /></label>
-                <button type="button" aria-label={`Remove quote ${index + 1}`} onClick={() => setQuotes((rows) => rows.filter((_, i) => i !== index))}>×</button>
-              </article>
-            ))}
-          </div>
-
-          <div className="paste-upload">
-            <label>Paste JSON, CSV, or vendor|qty|price|delivery|warranty text
-              <textarea value={pasteText} onChange={(e) => setPasteText(e.target.value)} placeholder="vendor,quantity,unit_price,delivery_days,warranty_months…" />
+        {selectedSkill ? (
+          <form className="runner" onSubmit={runSkill}>
+            <label>
+              Arguments JSON
+              <textarea
+                spellCheck="false"
+                value={argsText}
+                onChange={(event) => setArgsText(event.target.value)}
+              />
             </label>
-            <div className="actions">
-              <button type="button" className="button secondary" onClick={applyPastedQuotes}>Use pasted quotes</button>
-              <label className="button secondary upload">Upload CSV/JSON/TXT
-                <input type="file" multiple accept=".csv,.json,.txt,text/csv,text/plain,application/json" onChange={handleFiles} />
-              </label>
-            </div>
+            <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>
-
-        <aside className="card controls">
-          <p className="eyebrow">Scoring</p>
-          <h2>Weights</h2>
-          {Object.entries(weights).map(([key, value]) => (
-            <label className="slider" key={key}>{key}<strong>{value}</strong>
-              <input type="range" min="0" max="100" value={value} onChange={(e) => setWeights((w) => ({ ...w, [key]: Number(e.target.value) }))} />
-            </label>
-          ))}
-          <p className="hint">Total weight: {totalWeight}. Scores normalize each dimension from 0 to 1, then apply these weights.</p>
-          {validation ? <p className="validation">{validation}</p> : null}
-          {error ? <p className="error">{error}</p> : null}
-          {status ? <p className="status">{status}</p> : null}
-          <button className="button primary" disabled={running || needsSignIn || Boolean(validation)} type="submit">{running ? "Running…" : "Compare & save"}</button>
-          <button className="button secondary" disabled={running || needsSignIn} type="button" onClick={() => reopen()}>Reopen by ID</button>
-          {needsSignIn && authHref ? <a className="signin-note" href={authHref}>Sign in with A2A Cloud to call backend tools.</a> : null}
-          <div className="history">
-            <h3>Recent IDs</h3>
-            {history.length ? history.map((id) => <button key={id} type="button" onClick={() => reopen(id)}>{id}</button>) : <p>No saved comparisons opened in this browser yet.</p>}
-          </div>
-        </aside>
-      </form>
-
-      <section className="card result-card">
-        <div className="section-head">
-          <div>
-            <p className="eyebrow">Backend result</p>
-            <h2>{result?.ok ? `Recommended: ${result.recommendation.vendor}` : "No recommendation yet"}</h2>
-          </div>
-          {result?.ok ? <span className="score">Score {result.recommendation.score.toFixed(2)}</span> : null}
-        </div>
-        {result?.ok ? (
-          <>
-            <p className="rationale">{result.recommendation.rationale}</p>
-            <div className="table-wrap">
-              <table>
-                <thead><tr><th>Vendor</th><th>Total</th><th>Delivery</th><th>Warranty</th><th>Weighted score</th></tr></thead>
-                <tbody>
-                  {result.quotes.map((quote) => (
-                    <tr key={quote.vendor} className={quote.vendor === result.recommendation.vendor ? "winner" : ""}>
-                      <td>{quote.vendor}</td>
-                      <td>{quote.subtotal.toLocaleString(undefined, { style: "currency", currency: "BRL" })}</td>
-                      <td>{quote.delivery_days} days</td>
-                      <td>{quote.warranty_months} months</td>
-                      <td>{quote.scores.weighted_total.toFixed(2)}</td>
-                    </tr>
-                  ))}
-                </tbody>
-              </table>
-            </div>
-          </>
-        ) : (
-          <p className="empty">Run a comparison or reopen a saved ID. Fewer than two quotes are blocked before calling the backend and also rejected by the typed tool.</p>
-        )}
       </section>
     </main>
   );