fix: separate codex mcp into codex mcp-server and codex app-server (#4471)
This is a very large PR with some non-backwards-compatible changes. Historically, `codex mcp` (or `codex mcp serve`) started a JSON-RPC-ish server that had two overlapping responsibilities: - Running an MCP server, providing some basic tool calls. - Running the app server used to power experiences such as the VS Code extension. This PR aims to separate these into distinct concepts: - `codex mcp-server` for the MCP server - `codex app-server` for the "application server" Note `codex mcp` still exists because it already has its own subcommands for MCP management (`list`, `add`, etc.) The MCP logic continues to live in `codex-rs/mcp-server` whereas the refactored app server logic is in the new `codex-rs/app-server` folder. Note that most of the existing integration tests in `codex-rs/mcp-server/tests/suite` were actually for the app server, so all the tests have been moved with the exception of `codex-rs/mcp-server/tests/suite/mod.rs`. Because this is already a large diff, I tried not to change more than I had to, so `codex-rs/app-server/tests/common/mcp_process.rs` still uses the name `McpProcess` for now, but I will do some mechanical renamings to things like `AppServer` in subsequent PRs. While `mcp-server` and `app-server` share some overlapping functionality (like reading streams of JSONL and dispatching based on message types) and some differences (completely different message types), I ended up doing a bit of copypasta between the two crates, as both have somewhat similar `message_processor.rs` and `outgoing_message.rs` files for now, though I expect them to diverge more in the near future. One material change is that of the initialize handshake for `codex app-server`, as we no longer use the MCP types for that handshake. Instead, we update `codex-rs/protocol/src/mcp_protocol.rs` to add an `Initialize` variant to `ClientRequest`, which takes the `ClientInfo` object we need to update the `USER_AGENT_SUFFIX` in `codex-rs/app-server/src/message_processor.rs`. One other material change is in `codex-rs/app-server/src/codex_message_processor.rs` where I eliminated a use of the `send_event_as_notification()` method I am generally trying to deprecate (because it blindly maps an `EventMsg` into a `JSONNotification`) in favor of `send_server_notification()`, which takes a `ServerNotification`, as that is intended to be a custom enum of all notification types supported by the app server. So to make this update, I had to introduce a new variant of `ServerNotification`, `SessionConfigured`, which is a non-backwards compatible change with the old `codex mcp`, and clients will have to be updated after the next release that contains this PR. Note that `codex-rs/app-server/tests/suite/list_resume.rs` also had to be update to reflect this change. I introduced `codex-rs/utils/json-to-toml/src/lib.rs` as a small utility crate to avoid some of the copying between `mcp-server` and `app-server`.
This commit is contained in:
Michael Bolin
GitHub
146
codex-rs/app-server/tests/suite/login.rs
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146
codex-rs/app-server/tests/suite/login.rs
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use std::path::Path;
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use std::time::Duration;
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use app_test_support::McpProcess;
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use app_test_support::to_response;
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use codex_login::login_with_api_key;
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use codex_protocol::mcp_protocol::CancelLoginChatGptParams;
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use codex_protocol::mcp_protocol::CancelLoginChatGptResponse;
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use codex_protocol::mcp_protocol::GetAuthStatusParams;
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use codex_protocol::mcp_protocol::GetAuthStatusResponse;
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use codex_protocol::mcp_protocol::LoginChatGptResponse;
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use codex_protocol::mcp_protocol::LogoutChatGptResponse;
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use mcp_types::JSONRPCResponse;
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use mcp_types::RequestId;
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use tempfile::TempDir;
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use tokio::time::timeout;
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const DEFAULT_READ_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(10);
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// Helper to create a config.toml; mirrors create_conversation.rs
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fn create_config_toml(codex_home: &Path) -> std::io::Result<()> {
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let config_toml = codex_home.join("config.toml");
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std::fs::write(
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config_toml,
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r#"
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model = "mock-model"
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approval_policy = "never"
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sandbox_mode = "danger-full-access"
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model_provider = "mock_provider"
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[model_providers.mock_provider]
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name = "Mock provider for test"
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base_url = "http://127.0.0.1:0/v1"
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wire_api = "chat"
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request_max_retries = 0
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stream_max_retries = 0
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"#,
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)
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
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async fn logout_chatgpt_removes_auth() {
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let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
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create_config_toml(codex_home.path()).expect("write config.toml");
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login_with_api_key(codex_home.path(), "sk-test-key").expect("seed api key");
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assert!(codex_home.path().join("auth.json").exists());
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let mut mcp = McpProcess::new_with_env(codex_home.path(), &[("OPENAI_API_KEY", None)])
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.await
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.expect("spawn mcp process");
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timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())
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.await
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.expect("init timeout")
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.expect("init failed");
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let id = mcp
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.send_logout_chat_gpt_request()
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.await
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.expect("send logoutChatGpt");
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let resp: JSONRPCResponse = timeout(
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DEFAULT_READ_TIMEOUT,
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mcp.read_stream_until_response_message(RequestId::Integer(id)),
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)
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.await
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.expect("logoutChatGpt timeout")
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.expect("logoutChatGpt response");
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let _ok: LogoutChatGptResponse = to_response(resp).expect("deserialize logout response");
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assert!(
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!codex_home.path().join("auth.json").exists(),
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"auth.json should be deleted"
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);
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// Verify status reflects signed-out state.
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let status_id = mcp
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.send_get_auth_status_request(GetAuthStatusParams {
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include_token: Some(true),
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refresh_token: Some(false),
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})
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.await
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.expect("send getAuthStatus");
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let status_resp: JSONRPCResponse = timeout(
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DEFAULT_READ_TIMEOUT,
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mcp.read_stream_until_response_message(RequestId::Integer(status_id)),
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)
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.await
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.expect("getAuthStatus timeout")
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.expect("getAuthStatus response");
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let status: GetAuthStatusResponse = to_response(status_resp).expect("deserialize status");
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assert_eq!(status.auth_method, None);
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assert_eq!(status.auth_token, None);
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
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async fn login_and_cancel_chatgpt() {
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let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
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create_config_toml(codex_home.path()).unwrap_or_else(|err| panic!("write config.toml: {err}"));
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let mut mcp = McpProcess::new(codex_home.path())
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.await
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.expect("spawn mcp process");
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timeout(DEFAULT_READ_TIMEOUT, mcp.initialize())
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.await
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.expect("init timeout")
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.expect("init failed");
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let login_id = mcp
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.send_login_chat_gpt_request()
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.await
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.expect("send loginChatGpt");
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let login_resp: JSONRPCResponse = timeout(
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DEFAULT_READ_TIMEOUT,
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mcp.read_stream_until_response_message(RequestId::Integer(login_id)),
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)
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.await
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.expect("loginChatGpt timeout")
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.expect("loginChatGpt response");
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let login: LoginChatGptResponse = to_response(login_resp).expect("deserialize login resp");
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let cancel_id = mcp
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.send_cancel_login_chat_gpt_request(CancelLoginChatGptParams {
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login_id: login.login_id,
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})
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.await
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.expect("send cancelLoginChatGpt");
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let cancel_resp: JSONRPCResponse = timeout(
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DEFAULT_READ_TIMEOUT,
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mcp.read_stream_until_response_message(RequestId::Integer(cancel_id)),
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)
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.await
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.expect("cancelLoginChatGpt timeout")
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.expect("cancelLoginChatGpt response");
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let _ok: CancelLoginChatGptResponse =
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to_response(cancel_resp).expect("deserialize cancel response");
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// Optionally observe the completion notification; do not fail if it races.
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let maybe_note = timeout(
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Duration::from_secs(2),
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mcp.read_stream_until_notification_message("codex/event/login_chat_gpt_complete"),
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)
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.await;
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if maybe_note.is_err() {
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eprintln!("warning: did not observe login_chat_gpt_complete notification after cancel");
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}
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}
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