feat(models): capability toggles for custom models with upsert and live caps refresh

- AddCustomModelModal lets users pick vision/reasoning caps when adding a model
- POST /api/models/custom whitelists caps to booleans
- aliasRepo.addCustomModel upserts — re-adding updates caps/name in place
- /api/models includes custom llm models with stored caps overriding the heuristic
- useModelCaps refetches on customModelChanged instead of trusting a stale cache

Co-Authored-By: Claude Code <noreply@anthropic.com>

src/app/(dashboard)/dashboard/providers/[id]/AddCustomModelModal.js

@@ -2,17 +2,21 @@
 
 import { useState, useEffect } from "react";
 import PropTypes from "prop-types";
-import { Button, Modal } from "@/shared/components";
+import { Button, Modal, Toggle } from "@/shared/components";
+import { CAPACITY_META } from "@/shared/constants/models";
+
+const defaultCaps = () => Object.fromEntries(Object.keys(CAPACITY_META).map((key) => [key, false]));
 
 export default function AddCustomModelModal({ isOpen, providerAlias, providerDisplayAlias, onSave, onClose }) {
   const [modelId, setModelId] = useState("");
+  const [caps, setCaps] = useState(defaultCaps);
   const [testStatus, setTestStatus] = useState(null); // null | "testing" | "ok" | "error"
   const [testError, setTestError] = useState("");
   const [saving, setSaving] = useState(false);
 
   // Reset state when modal opens
   useEffect(() => {
-    if (isOpen) { setModelId(""); setTestStatus(null); setTestError(""); }
+    if (isOpen) { setModelId(""); setCaps(defaultCaps()); setTestStatus(null); setTestError(""); }
   }, [isOpen]);
 
   // Strip provider's own alias prefix (e.g. "cc/model" -> "model" for cc provider)
@@ -46,7 +50,7 @@ export default function AddCustomModelModal({ isOpen, providerAlias, providerDis
     if (!cleanId || saving) return;
     setSaving(true);
     try {
-      await onSave(cleanId);
+      await onSave(cleanId, caps);
     } finally {
       setSaving(false);
     }
@@ -86,6 +90,22 @@ export default function AddCustomModelModal({ isOpen, providerAlias, providerDis
           </p>
         </div>
 
+        <div>
+          <label className="text-sm font-medium mb-1.5 block">Capabilities</label>
+          <div className="flex flex-wrap gap-4">
+            {Object.entries(CAPACITY_META).map(([key, meta]) => (
+              <Toggle
+                key={key}
+                checked={!!caps[key]}
+                onChange={(v) => setCaps((prev) => ({ ...prev, [key]: v }))}
+                label={meta.label}
+                description={meta.desc}
+                size="sm"
+              />
+            ))}
+          </div>
+        </div>
+
         {/* Test result */}
         {testStatus === "ok" && (
           <div className="flex items-center gap-2 text-sm text-green-600">

src/app/(dashboard)/dashboard/providers/[id]/page.js

@@ -527,12 +527,12 @@ export default function ProviderDetailPage() {
     }
   };
 
-  const handleAddCustomModel = async (modelId, type = "llm", providerAliasOverride = providerStorageAlias) => {
+  const handleAddCustomModel = async (modelId, type = "llm", providerAliasOverride = providerStorageAlias, caps) => {
     try {
       const res = await fetch("/api/models/custom", {
         method: "POST",
         headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ providerAlias: providerAliasOverride, id: modelId, type }),
+        body: JSON.stringify({ providerAlias: providerAliasOverride, id: modelId, type, ...(caps ? { caps } : {}) }),
       });
       if (res.ok) {
         await fetchCustomModels();
@@ -1781,8 +1781,8 @@ export default function ProviderDetailPage() {
           isOpen={showAddCustomModel}
           providerAlias={providerStorageAlias}
           providerDisplayAlias={providerDisplayAlias}
-          onSave={async (modelId) => {
-            await handleAddCustomModel(modelId, "llm", providerStorageAlias);
+          onSave={async (modelId, caps) => {
+            await handleAddCustomModel(modelId, "llm", providerStorageAlias, caps);
             setShowAddCustomModel(false);
           }}
           onClose={() => setShowAddCustomModel(false)}

src/app/api/models/custom/route.js

@@ -1,8 +1,19 @@
 import { NextResponse } from "next/server";
 import { getCustomModels, addCustomModel, deleteCustomModel } from "@/models";
+import { CAPACITY_META } from "@/shared/constants/models";
 
 export const dynamic = "force-dynamic";
 
+// Whitelist capability keys to boolean values — ignore anything else
+function sanitizeCaps(caps) {
+  if (!caps || typeof caps !== "object") return null;
+  const clean = {};
+  for (const key of Object.keys(CAPACITY_META)) {
+    if (typeof caps[key] === "boolean") clean[key] = caps[key];
+  }
+  return Object.keys(clean).length ? clean : null;
+}
+
 // GET /api/models/custom - List all custom models
 export async function GET() {
   try {
@@ -17,11 +28,12 @@ export async function GET() {
 // POST /api/models/custom - Add custom model
 export async function POST(request) {
   try {
-    const { providerAlias, id, type, name } = await request.json();
+    const { providerAlias, id, type, name, caps } = await request.json();
     if (!providerAlias || !id) {
       return NextResponse.json({ error: "providerAlias and id required" }, { status: 400 });
     }
-    const added = await addCustomModel({ providerAlias, id, type: type || "llm", name });
+    const cleanCaps = sanitizeCaps(caps);
+    const added = await addCustomModel({ providerAlias, id, type: type || "llm", name, ...(cleanCaps ? { caps: cleanCaps } : {}) });
     return NextResponse.json({ success: true, added });
   } catch (error) {
     console.log("Error adding custom model:", error);

src/app/api/models/route.js

@@ -1,5 +1,5 @@
 import { NextResponse } from "next/server";
-import { getModelAliases, setModelAlias } from "@/models";
+import { getModelAliases, setModelAlias, getCustomModels } from "@/models";
 import { getDisabledModels } from "@/lib/disabledModelsDb";
 import { AI_MODELS } from "@/shared/constants/config";
 import { getProviderAlias } from "@/shared/constants/providers";
@@ -37,6 +37,33 @@ export async function GET() {
         };
       });
 
+    // Custom models ride along; their stored caps override the name heuristic
+    const seenFull = new Set(models.map((m) => m.fullModel));
+    const customModels = (await getCustomModels()).filter((m) => {
+      if (!m?.id || (m.kind || m.type || "llm") !== "llm") return false;
+      return !seenFull.has(`${m.providerAlias}/${m.id}`);
+    });
+    for (const m of customModels) {
+      const fullModel = `${m.providerAlias}/${m.id}`;
+      const c = getCapabilitiesForModel(m.providerAlias, m.id);
+      models.push({
+        provider: m.providerAlias,
+        model: m.id,
+        name: m.name || m.id,
+        fullModel,
+        routedModel: fullModel,
+        alias: modelAliases[fullModel] || m.id,
+        caps: {
+          vision: c.vision,
+          search: c.search,
+          reasoning: c.reasoning,
+          contextWindow: c.contextWindow,
+          maxOutput: c.maxOutput,
+          ...(m.caps || {}),
+        },
+      });
+    }
+
     return NextResponse.json({ models });
   } catch (error) {
     console.log("Error fetching models:", error);

src/lib/db/repos/aliasRepo.js

@@ -29,15 +29,21 @@ export async function getCustomModels() {
   return Object.values(all);
 }
 
-// Atomic check-then-insert inside transaction to prevent duplicate races
-export async function addCustomModel({ providerAlias, id, type = "llm", name }) {
+// Atomic upsert inside transaction to prevent duplicate races.
+// Re-adding an existing model updates caps/name without resetting omitted fields.
+export async function addCustomModel({ providerAlias, id, type = "llm", name, caps }) {
   const k = customKey(providerAlias, id, type);
   const db = await getAdapter();
   let added = false;
   db.transaction(() => {
-    const row = db.get(`SELECT 1 FROM kv WHERE scope = 'customModels' AND key = ?`, [k]);
-    if (row) return;
-    const value = stringifyJson({ providerAlias, id, type, name: name || id });
+    const row = db.get(`SELECT value FROM kv WHERE scope = 'customModels' AND key = ?`, [k]);
+    if (row) {
+      const prev = parseJson(row.value) || {};
+      const next = { ...prev, ...(name ? { name } : {}), ...(caps ? { caps } : {}) };
+      db.run(`UPDATE kv SET value = ? WHERE scope = 'customModels' AND key = ?`, [stringifyJson(next), k]);
+      return;
+    }
+    const value = stringifyJson({ providerAlias, id, type, name: name || id, ...(caps ? { caps } : {}) });
     db.run(`INSERT INTO kv(scope, key, value) VALUES('customModels', ?, ?)`, [k, value]);
     added = true;
   });

src/shared/hooks/useModelCaps.js

@@ -59,16 +59,25 @@ export function useModelCaps() {
   const [byId, setById] = useState(() => cache?.byId || {});
 
   useEffect(() => {
-    if (cache) {
-      setByFull(cache.byFull);
-      setById(cache.byId);
-      return;
-    }
     let alive = true;
-    loadModelCaps().then((maps) => {
+    const sync = (maps) => {
       if (alive) { setByFull(maps.byFull); setById(maps.byId); }
-    });
-    return () => { alive = false; };
+    };
+    if (cache) {
+      sync(cache);
+    } else {
+      loadModelCaps().then(sync);
+    }
+    // Custom models change at runtime — drop the shared cache and refetch
+    const invalidate = () => {
+      cache = null;
+      loadModelCaps().then(sync);
+    };
+    window.addEventListener("customModelChanged", invalidate);
+    return () => {
+      alive = false;
+      window.removeEventListener("customModelChanged", invalidate);
+    };
   }, []);
 
   const getCaps = useCallback(