diff --git a/index.mjs b/index.mjs
index 1a42997..5e33814 100644
--- a/index.mjs
+++ b/index.mjs
@@ -243,7 +243,10 @@ export async function CrofaiPlugin() {
     // second pass, not plugin-returned model variants).
     config: async (config) => {
       config.provider = config.provider || {};
+      // Preserve any pre-existing user config (whitelist, blacklist, options, etc.)
+      // before setting our provider definition fields.
       config.provider.crofai = {
+        ...config.provider.crofai,
         id: PROVIDER_ID,
         name: "CrofAI",
         npm: "@ai-sdk/openai-compatible",
diff --git a/test/plugin.test.js b/test/plugin.test.js
index 45df098..88c1ec9 100644
--- a/test/plugin.test.js
+++ b/test/plugin.test.js
@@ -60,6 +60,46 @@ describe("config hook", () => {
     assert.equal(cfg.provider.crofai.id, "crofai");
   });
 
+  it("preserves user-defined whitelist, blacklist, and options on the crofai provider", async () => {
+    const hooks = await CrofaiPlugin();
+    const cfg = {
+      provider: {
+        crofai: {
+          whitelist: ["deepseek-v4-pro", "kimi-k2.6"],
+          blacklist: ["some-model-i-dont-want"],
+          options: { timeout: 300000 },
+        },
+      },
+    };
+    await hooks.config(cfg);
+
+    const p = cfg.provider.crofai;
+    assert.deepEqual(p.whitelist, ["deepseek-v4-pro", "kimi-k2.6"], "whitelist should survive config hook");
+    assert.deepEqual(p.blacklist, ["some-model-i-dont-want"], "blacklist should survive config hook");
+    assert.deepEqual(p.options, { timeout: 300000 }, "options should survive config hook");
+    // Core provider fields should still be set
+    assert.equal(p.id, "crofai");
+    assert.equal(p.npm, "@ai-sdk/openai-compatible");
+  });
+
+  it("allows overriding provider options while preserving whitelist", async () => {
+    const hooks = await CrofaiPlugin();
+    const cfg = {
+      provider: {
+        crofai: {
+          whitelist: ["kimi-k2.6"],
+        },
+      },
+    };
+    await hooks.config(cfg);
+
+    assert.deepEqual(
+      cfg.provider.crofai.whitelist,
+      ["kimi-k2.6"],
+      "whitelist alone should survive the config hook",
+    );
+  });
+
   it("injects all models from cache with full config data", async () => {
     const cachePath = getCachePath();
     const cacheDir = join(cachePath, "..");