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Give hosted Codex Apps an independent MCP protocol opt-in (#44318)

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## Why

Hosted Codex Apps shared the `mcp_2026_07_28` protocol setting with other MCP servers, preventing independent protocol selection.

## What changed

- Add `features.codex_apps_mcp_2026_07_28`, disabled by default, for the host-owned HTTP `codex_apps` server. Enabling it attempts 2026-07-28 discovery with Legacy fallback.
- Keep other servers, including third-party registrations with Apps-like names or URLs and local stdio servers, governed by `mcp_2026_07_28`.
- Support the new flag through `experimentalFeature/enablement/set` and refresh protocol settings in existing sessions. Track protocol mode per server when deciding whether to reuse connections.

## Testing

Add coverage for independent feature and protocol selection, hosted event-stream protocol selection, standalone Legacy defaults and discovery fallback, and runtime enablement refreshing an existing app-server thread.

GitOrigin-RevId: 640e8e251f0c45e5f4829cc2b73c3082cf42f715
This commit is contained in:
thomas
2026-09-09 22:22:08 +00:00
committed by copyberry
parent e1b23086ac
commit eb680c0558
18 changed files with 431 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
codex-rs/core/src/session/mod.rs
+24
View File
@@ -1931,6 +1931,18 @@ impl Session {
config.mcp_servers = next_config.mcp_servers.clone();
config.mcp_optional_startup_grace = next_config.mcp_optional_startup_grace;
config.mcp_oauth_credentials_store_mode = next_config.mcp_oauth_credentials_store_mode;
if let Err(err) = config.features.set_enabled(
Feature::Mcp20260728,
next_config.features.enabled(Feature::Mcp20260728),
) {
warn!("failed to refresh MCP protocol config: {err}");
}
if let Err(err) = config.features.set_enabled(
Feature::CodexAppsMcp20260728,
next_config.features.enabled(Feature::CodexAppsMcp20260728),
) {
warn!("failed to refresh Codex Apps MCP protocol config: {err}");
}
if let Err(err) = config.features.set_enabled(
Feature::SecretAuthStorage,
next_config.features.enabled(Feature::SecretAuthStorage),
@@ -1987,6 +1999,18 @@ impl Session {
config.mcp_servers = next_config.mcp_servers;
config.mcp_optional_startup_grace = next_config.mcp_optional_startup_grace;
config.mcp_oauth_credentials_store_mode = next_config.mcp_oauth_credentials_store_mode;
if let Err(err) = config.features.set_enabled(
Feature::Mcp20260728,
next_config.features.enabled(Feature::Mcp20260728),
) {
warn!("failed to refresh MCP protocol config: {err}");
}
if let Err(err) = config.features.set_enabled(
Feature::CodexAppsMcp20260728,
next_config.features.enabled(Feature::CodexAppsMcp20260728),
) {
warn!("failed to refresh Codex Apps MCP protocol config: {err}");
}
if let Err(err) = config.features.set_enabled(
Feature::SecretAuthStorage,
next_config.features.enabled(Feature::SecretAuthStorage),