diff --git a/package-lock.json b/package-lock.json
index 39b18d35..9c64924e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "0.0.44",
       "license": "Apache-2.0",
       "dependencies": {
-        "@agentclientprotocol/sdk": "^0.21.0",
+        "@agentclientprotocol/sdk": "^0.22.1",
         "@openai/codex": "^0.128.0",
         "diff": "^8.0.3",
         "open": "^11.0.0",
@@ -28,9 +28,9 @@
       }
     },
     "node_modules/@agentclientprotocol/sdk": {
-      "version": "0.21.0",
-      "resolved": "https://registry.npmjs.org/@agentclientprotocol/sdk/-/sdk-0.21.0.tgz",
-      "integrity": "sha512-ONj+Q8qOdNQp5XbH5jnMwzT9IKZJsSN0p0lkceS4GtUtNOPVLpNzSS8gqQdGMKfBvA0ESbkL8BTaSN1Rc9miEw==",
+      "version": "0.22.1",
+      "resolved": "https://registry.npmjs.org/@agentclientprotocol/sdk/-/sdk-0.22.1.tgz",
+      "integrity": "sha512-DfqXtl/8gO9NImq094MTaCXEU2vkhh6v7q/kT+9UjZxUqj8hYaya2OjLVIqn16MzNHcXEpShTR2RIauLSYeDQQ==",
       "license": "Apache-2.0",
       "peerDependencies": {
         "zod": "^3.25.0 || ^4.0.0"
diff --git a/package.json b/package.json
index 09ae5b96..9c35aa89 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "vitest": "^4.0.10"
   },
   "dependencies": {
-    "@agentclientprotocol/sdk": "^0.21.0",
+    "@agentclientprotocol/sdk": "^0.22.1",
     "@openai/codex": "^0.128.0",
     "diff": "^8.0.3",
     "open": "^11.0.0",
diff --git a/src/CodexAcpClient.ts b/src/CodexAcpClient.ts
index 9f478110..4cc759b4 100644
--- a/src/CodexAcpClient.ts
+++ b/src/CodexAcpClient.ts
@@ -332,12 +332,16 @@ export class CodexAcpClient {
      */
     private createMcpSeverConfig(mcpServer: McpServer): JsonObject {
         if ("type" in mcpServer) {
-            if (mcpServer.type == "sse") {
-                throw RequestError.invalidRequest("Codex doesn't support MCP SSE transport protocol")
-            }
-            return {
-                "url": mcpServer.url,
-                "http_headers": Object.fromEntries(mcpServer.headers.map(h => [h.name, h.value])),
+            switch (mcpServer.type) {
+                case "acp":
+                    throw RequestError.invalidRequest("Codex doesn't support MCP ACP transport protocol")
+                case "sse":
+                    throw RequestError.invalidRequest("Codex doesn't support MCP SSE transport protocol")
+                case "http":
+                    return {
+                        "url": mcpServer.url,
+                        "http_headers": Object.fromEntries(mcpServer.headers.map(h => [h.name, h.value])),
+                    }
             }
         }
         return {
diff --git a/src/CodexAcpServer.ts b/src/CodexAcpServer.ts
index 38b93d40..dbf05a91 100644
--- a/src/CodexAcpServer.ts
+++ b/src/CodexAcpServer.ts
@@ -113,6 +113,7 @@ export class CodexAcpServer implements acp.Agent {
                     list: { }
                 },
                 mcpCapabilities: {
+                    acp: false,
                     http: true,
                     sse: false
                 }
diff --git a/src/__tests__/CodexACPAgent/initialize.test.ts b/src/__tests__/CodexACPAgent/initialize.test.ts
index 372fee82..f9cf3f2e 100644
--- a/src/__tests__/CodexACPAgent/initialize.test.ts
+++ b/src/__tests__/CodexACPAgent/initialize.test.ts
@@ -44,6 +44,7 @@ describe('CodexACPAgent - initialize', () => {
                     list: {},
                 },
                 mcpCapabilities: {
+                    acp: false,
                     http: true,
                     sse: false,
                 },