diff --git a/sdks/typescript-agent-sdk/tests/session.test.ts b/sdks/typescript-agent-sdk/tests/session.test.ts
new file mode 100644
index 00000000000..4ca4d1d8efc
--- /dev/null
+++ b/sdks/typescript-agent-sdk/tests/session.test.ts
@@ -0,0 +1,137 @@
+/**
+ * Spec tests for `SessionHandle`.
+ */
+
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { Agent } from "../src/index.js";
+import { MockProxy } from "./mock-proxy.js";
+
+describe("SessionHandle", () => {
+  let proxy: MockProxy;
+  let baseUrl: string;
+
+  beforeEach(async () => {
+    proxy = new MockProxy();
+    baseUrl = await proxy.start();
+  });
+
+  afterEach(async () => {
+    await proxy.stop();
+  });
+
+  it("send() accepts a string and starts a new run", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    const run = await session.send("hello");
+    expect(run.id).toMatch(/^run_/);
+    expect(run.sessionId).toBe(session.id);
+    expect(run.status).toBe("queued");
+  });
+
+  it("send() accepts a structured input with images", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    const run = await session.send({
+      text: "describe this",
+      images: [{ url: "https://example.com/cat.png" }],
+    });
+    expect(run.id).toMatch(/^run_/);
+  });
+
+  it("send() returns a 409 if a run is already in flight", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    await session.send("first");
+    await expect(
+      session.send({ text: "second", images: [] })
+    ).rejects.toMatchObject({ name: "LiteLLMAgentError", status: 409 });
+  });
+
+  it("getRun() round-trips a run by ID", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    const created = await session.send("yo");
+    const fetched = await session.getRun(created.id);
+    expect(fetched.id).toBe(created.id);
+    expect(fetched.sessionId).toBe(session.id);
+  });
+
+  it("listRuns() returns runs created in this session", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    const r1 = await session.send("one");
+    proxy.complete(r1.id, "done one");
+    const r2 = await session.send("two");
+    proxy.complete(r2.id, "done two");
+
+    const listed = await session.listRuns();
+    const ids = new Set(listed.items.map((r) => r.id));
+    expect(ids).toEqual(new Set([r1.id, r2.id]));
+  });
+
+  it("conversation() returns turns recorded by the proxy", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    await session.send("first message");
+    const turns = await session.conversation();
+    expect(turns.some((t) => t.role === "user" && t.content === "first message")).toBe(
+      true
+    );
+  });
+
+  it("delete() flips status to terminated server-side", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    await session.delete();
+    const proxySession = proxy.findSession(session.id);
+    expect(proxySession?.status).toBe("terminated");
+    expect(session.status).toBe("terminated");
+  });
+
+  it("terminate() is an alias for delete()", async () => {
+    const agent = await Agent.create({
+      apiKey: "test-key",
+      baseUrl,
+      name: "s",
+      model: { id: "m" },
+    });
+    const session = await agent.createSession();
+    await session.terminate();
+    expect(proxy.findSession(session.id)?.status).toBe("terminated");
+  });
+});