fix(providers): add official opencode client User-Agent to opencode-free

src/providers/registry.ts

@@ -2435,6 +2435,7 @@ export const PROVIDER_REGISTRY: readonly ProviderRegistryEntry[] = [
     note: "No key needed — public desktop tier. OpenCode currently advertises about 200 Big Pickle/free-model requests per 5 hours. The same Zen gateway can also short-window rate-limit free models at roughly 15-20 requests/minute, and may return generic 429s without Retry-After (opencodex synthesizes backoff only when that header is omitted). Free models are discovered live from Zen. Data use: per OpenCode's Zen docs (https://opencode.ai/docs/zen/), prompts sent to free models may be retained and used for training/improvement — do not send confidential material through this provider.",
     dashboardUrl: "https://opencode.ai",
     staticHeaders: {
+      "User-Agent": "opencode",
       "x-opencode-client": "desktop",
     },
     modelReasoningEfforts: Object.fromEntries(OPENCODE_FREE_DEEPSEEK_MODELS.map(id => [id, deepseekThinkingEffortsFor(id)])),

tests/management-provider-validation.test.ts

@@ -2888,11 +2888,11 @@ describe("provider management validation", () => {
     };
 
     // Clearing user-managed headers must not delete the registry-owned static
-    // metadata (opencode-free's x-opencode-client marker) the transport relies on.
+    // metadata (opencode-free's User-Agent and x-opencode-client markers) the transport relies on.
     expect((await patch("opencode-free", { headers: null }))?.status).toBe(200);
-    expect(liveConfig.providers["opencode-free"].headers).toEqual({ "x-opencode-client": "desktop" });
+    expect(liveConfig.providers["opencode-free"].headers).toEqual({ "User-Agent": "opencode", "x-opencode-client": "desktop" });
     const saved = JSON.parse(readFileSync(join(TEST_DIR, "config.json"), "utf8")) as OcxConfig;
-    expect(saved.providers["opencode-free"]?.headers).toEqual({ "x-opencode-client": "desktop" });
+    expect(saved.providers["opencode-free"]?.headers).toEqual({ "User-Agent": "opencode", "x-opencode-client": "desktop" });
   });
   test("concurrent provider PATCHes merge different headers", async () => {
     if (existsSync(TEST_DIR)) rmSync(TEST_DIR, { recursive: true });

tests/opencode-free-provider.test.ts

@@ -29,12 +29,14 @@ describe("opencode-free provider", () => {
 
   test("static headers include only the public client marker", () => {
     expect(entry?.staticHeaders?.["Authorization"]).toBeUndefined();
+    expect(entry?.staticHeaders?.["User-Agent"]).toBe("opencode");
     expect(entry?.staticHeaders?.["x-opencode-client"]).toBe("desktop");
   });
 
   test("providerConfigSeed propagates static headers", () => {
     const seed = providerConfigSeed(entry!);
     expect(seed.headers?.["Authorization"]).toBeUndefined();
+    expect(seed.headers?.["User-Agent"]).toBe("opencode");
     expect(seed.headers?.["x-opencode-client"]).toBe("desktop");
     expect(seed.keyOptional).toBe(true);
     expect(seed.liveModels).toBe(true);
@@ -55,6 +57,7 @@ describe("opencode-free provider", () => {
     const req = adapter.buildRequest(minimalRequest());
     const headers = req.headers as Record<string, string>;
     expect(headers["Authorization"]).toBeUndefined();
+    expect(headers["User-Agent"]).toBe("opencode");
     expect(headers["x-opencode-client"]).toBe("desktop");
     expect(req.url).toBe("https://opencode.ai/zen/v1/chat/completions");
   });