diff --git a/packages/server/src/server/voice-mcp-bridge.test.ts b/packages/server/src/server/voice-mcp-bridge.test.ts
new file mode 100644
index 000000000..942d55925
--- /dev/null
+++ b/packages/server/src/server/voice-mcp-bridge.test.ts
@@ -0,0 +1,93 @@
+import os from "node:os";
+import path from "node:path";
+import { mkdtemp, rm } from "node:fs/promises";
+import { describe, expect, test } from "vitest";
+import { experimental_createMCPClient } from "ai";
+import { z } from "zod";
+import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import pino from "pino";
+
+import { createVoiceMcpBridgeSocketServer } from "./voice-mcp-bridge.js";
+
+describe("voice MCP bridge", () => {
+  test("proxies stdio MCP messages through unix socket bridge", async () => {
+    const tmpRoot = await mkdtemp(path.join(os.tmpdir(), "paseo-voice-mcp-bridge-"));
+    const socketPath = path.join(tmpRoot, "voice-mcp.sock");
+    const callerAgentId = "voice-agent-bridge-test";
+
+    const bridge = createVoiceMcpBridgeSocketServer({
+      socketPath,
+      logger: pino({ level: "silent" }),
+      createAgentMcpServerForCaller: async (callerId) => {
+        const server = new McpServer({
+          name: "bridge-test-server",
+          version: "1.0.0",
+        });
+
+        server.registerTool(
+          "echo_caller",
+          {
+            value: z.string().optional(),
+          },
+          async (args) => {
+            return {
+              content: [
+                {
+                  type: "text",
+                  text: JSON.stringify({
+                    callerAgentId: callerId,
+                    value: args.value ?? null,
+                  }),
+                },
+              ],
+              structuredContent: {
+                callerAgentId: callerId,
+                value: args.value ?? null,
+              },
+            };
+          }
+        );
+
+        return server;
+      },
+    });
+
+    await bridge.start();
+
+    const tsxBin = path.resolve(process.cwd(), "../../node_modules/.bin/tsx");
+    const serverIndex = path.resolve(process.cwd(), "src/server/index.ts");
+
+    const transport = new StdioClientTransport({
+      command: process.execPath,
+      args: [
+        tsxBin,
+        serverIndex,
+        "__paseo_voice_mcp_bridge",
+        "--socket",
+        socketPath,
+        "--caller-agent-id",
+        callerAgentId,
+      ],
+    });
+
+    const client = await experimental_createMCPClient({ transport });
+
+    try {
+      const result = await client.callTool({
+        name: "echo_caller",
+        args: { value: "ok" },
+      });
+
+      const payload =
+        ((result as { structuredContent?: { callerAgentId?: string; value?: string | null } })
+          .structuredContent) ?? null;
+
+      expect(payload?.callerAgentId).toBe(callerAgentId);
+    } finally {
+      await client.close();
+      await bridge.stop();
+      await rm(tmpRoot, { recursive: true, force: true });
+    }
+  }, 30_000);
+});