diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
new file mode 100644
index 0000000..221e0c8
--- /dev/null
+++ b/.gitea/workflows/ci.yml
@@ -0,0 +1,34 @@
+name: CI
+
+on:
+    push:
+        branches: ["main"]
+    pull_request:
+        branches: ["main"]
+
+jobs:
+    ci:
+        name: Build & Test
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v4
+
+            - name: Install pnpm
+              uses: pnpm/action-setup@v6
+
+            - name: Setup Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: "22"
+                  cache: "pnpm"
+
+            - name: Install dependencies
+              run: pnpm install
+
+            - name: Build
+              run: pnpm build
+
+            - name: Test
+              run: pnpm test
diff --git a/package.json b/package.json
index a0a3b06..77ecff2 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "build": "tsc",
     "dev": "tsc --watch",
     "start": "node dist/index.js",
+    "test": "vitest run",
     "prepublishOnly": "pnpm build"
   },
   "dependencies": {
@@ -19,7 +20,8 @@
   },
   "devDependencies": {
     "@types/node": "^22.19.21",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "vitest": "^4.1.9"
   },
   "engines": {
     "node": ">=22"
diff --git a/src/client.test.ts b/src/client.test.ts
new file mode 100644
index 0000000..6ece315
--- /dev/null
+++ b/src/client.test.ts
@@ -0,0 +1,163 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { BetterNewsClient } from "./client.js";
+
+function makeFetch(status: number, body: unknown) {
+    return vi.fn().mockResolvedValue({
+        ok: status >= 200 && status < 300,
+        status,
+        statusText: "OK",
+        json: () => Promise.resolve(body),
+        text: () => Promise.resolve(String(body)),
+    });
+}
+
+describe("BetterNewsClient", () => {
+    beforeEach(() => {
+        vi.unstubAllGlobals();
+    });
+
+    it("sends Authorization header with api key", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_test");
+        await client.get("/api/test");
+
+        const [, init] = fetch.mock.calls[0];
+        expect(init.headers["Authorization"]).toBe("Bearer bn_sk_test");
+    });
+
+    it("uses the configured baseUrl", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost:3000");
+        await client.get("/api/news");
+
+        const [url] = fetch.mock.calls[0];
+        expect(url).toBe("http://localhost:3000/api/news");
+    });
+
+    it("defaults baseUrl to https://api.betternews.app", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x");
+        await client.get("/api/news");
+
+        const [url] = fetch.mock.calls[0];
+        expect(url).toMatch(/^https:\/\/api\.betternews\.app/);
+    });
+
+    it("appends query string params", async () => {
+        const fetch = makeFetch(200, []);
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.get("/api/news", { page: 2, limit: 10 });
+
+        const [url] = fetch.mock.calls[0];
+        expect(url).toContain("page=2");
+        expect(url).toContain("limit=10");
+    });
+
+    it("omits undefined query params", async () => {
+        const fetch = makeFetch(200, []);
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.get("/api/news", { page: 1, limit: undefined });
+
+        const [url] = fetch.mock.calls[0];
+        expect(url).toContain("page=1");
+        expect(url).not.toContain("limit");
+    });
+
+    it("does not send Content-Type on GET requests", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.get("/api/news");
+
+        const [, init] = fetch.mock.calls[0];
+        expect(init.headers["Content-Type"]).toBeUndefined();
+    });
+
+    it("sends Content-Type application/json on POST with body", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.post("/api/news", { title: "Test" });
+
+        const [, init] = fetch.mock.calls[0];
+        expect(init.headers["Content-Type"]).toBe("application/json");
+        expect(init.body).toBe(JSON.stringify({ title: "Test" }));
+    });
+
+    it("does not send Content-Type on POST without body", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.post("/api/news/abc/submit");
+
+        const [, init] = fetch.mock.calls[0];
+        expect(init.headers["Content-Type"]).toBeUndefined();
+    });
+
+    it("throws with API error message on non-ok response", async () => {
+        const fetch = vi.fn().mockResolvedValue({
+            ok: false,
+            status: 404,
+            statusText: "Not Found",
+            json: () => Promise.resolve({ message: "news item not found" }),
+        });
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await expect(client.get("/api/news/bad-id")).rejects.toThrow(
+            "BetterNews API error 404: news item not found",
+        );
+    });
+
+    it("falls back to statusText when error body has no message", async () => {
+        const fetch = vi.fn().mockResolvedValue({
+            ok: false,
+            status: 500,
+            statusText: "Internal Server Error",
+            json: () => Promise.reject(new Error("not json")),
+            text: () => Promise.resolve(""),
+        });
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await expect(client.get("/api/news")).rejects.toThrow(
+            "BetterNews API error 500: Internal Server Error",
+        );
+    });
+
+    it("uses DELETE method", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.delete("/api/news/abc");
+
+        const [, init] = fetch.mock.calls[0];
+        expect(init.method).toBe("DELETE");
+    });
+
+    it("uses PATCH method with body", async () => {
+        const fetch = makeFetch(200, {});
+        vi.stubGlobal("fetch", fetch);
+
+        const client = new BetterNewsClient("bn_sk_x", "http://localhost");
+        await client.patch("/api/news/abc", { title: "Updated" });
+
+        const [, init] = fetch.mock.calls[0];
+        expect(init.method).toBe("PATCH");
+        expect(init.body).toBe(JSON.stringify({ title: "Updated" }));
+    });
+});
diff --git a/src/utils.test.ts b/src/utils.test.ts
new file mode 100644
index 0000000..050a4d0
--- /dev/null
+++ b/src/utils.test.ts
@@ -0,0 +1,35 @@
+import { describe, it, expect } from "vitest";
+import { handleTool } from "./utils.js";
+
+describe("handleTool", () => {
+    it("returns text content on success", async () => {
+        const tool = handleTool(async () => "hello");
+        const result = await tool({});
+        expect(result).toEqual({ content: [{ type: "text", text: "hello" }] });
+        expect(result.isError).toBeUndefined();
+    });
+
+    it("returns isError:true when handler throws an Error", async () => {
+        const tool = handleTool(async () => {
+            throw new Error("something went wrong");
+        });
+        const result = await tool({});
+        expect(result.isError).toBe(true);
+        expect(result.content[0].text).toBe("something went wrong");
+    });
+
+    it("returns isError:true when handler throws a non-Error value", async () => {
+        const tool = handleTool(async () => {
+            throw "string error";
+        });
+        const result = await tool({});
+        expect(result.isError).toBe(true);
+        expect(result.content[0].text).toBe("string error");
+    });
+
+    it("passes args through to the handler", async () => {
+        const tool = handleTool(async (args: { id: string }) => args.id);
+        const result = await tool({ id: "abc-123" });
+        expect(result.content[0].text).toBe("abc-123");
+    });
+});