feat: support product-scoped plugins. (#15041)

1. Added SessionSource::Custom(String) and --session-source.
  2. Enforced plugin and skill products by session_source.
  3. Applied the same filtering to curated background refresh.

codex-rs/app-server/src/codex_message_processor.rs

@@ -5631,6 +5631,17 @@ impl CodexMessageProcessor {
         };
         let app_summaries =
             plugin_app_helpers::load_plugin_app_summaries(&config, &outcome.plugin.apps).await;
+        let visible_skills = outcome
+            .plugin
+            .skills
+            .iter()
+            .filter(|skill| {
+                skill.matches_product_restriction_for_product(
+                    self.thread_manager.session_source().restriction_product(),
+                )
+            })
+            .cloned()
+            .collect::<Vec<_>>();
         let plugin = PluginDetail {
             marketplace_name: outcome.marketplace_name,
             marketplace_path: outcome.marketplace_path,
@@ -5645,7 +5656,7 @@ impl CodexMessageProcessor {
                 interface: outcome.plugin.interface.map(plugin_interface_to_info),
             },
             description: outcome.plugin.description,
-            skills: plugin_skills_to_info(&outcome.plugin.skills),
+            skills: plugin_skills_to_info(&visible_skills),
             apps: app_summaries,
             mcp_servers: outcome.plugin.mcp_server_names,
         };

codex-rs/app-server/src/lib.rs

@@ -336,6 +336,7 @@ pub async fn run_main(
         loader_overrides,
         default_analytics_enabled,
         AppServerTransport::Stdio,
+        SessionSource::VSCode,
     )
     .await
 }
@@ -346,6 +347,7 @@ pub async fn run_main_with_transport(
     loader_overrides: LoaderOverrides,
     default_analytics_enabled: bool,
     transport: AppServerTransport,
+    session_source: SessionSource,
 ) -> IoResult<()> {
     let (transport_event_tx, mut transport_event_rx) =
         mpsc::channel::<TransportEvent>(CHANNEL_CAPACITY);
@@ -621,7 +623,7 @@ pub async fn run_main_with_transport(
             feedback: feedback.clone(),
             log_db,
             config_warnings,
-            session_source: SessionSource::VSCode,
+            session_source,
             enable_codex_api_key_env: false,
         });
         let mut thread_created_rx = processor.thread_created_receiver();

codex-rs/app-server/src/main.rs

@@ -4,6 +4,7 @@ use codex_app_server::run_main_with_transport;
 use codex_arg0::Arg0DispatchPaths;
 use codex_arg0::arg0_dispatch_or_else;
 use codex_core::config_loader::LoaderOverrides;
+use codex_protocol::protocol::SessionSource;
 use codex_utils_cli::CliConfigOverrides;
 use std::path::PathBuf;
 
@@ -21,6 +22,15 @@ struct AppServerArgs {
         default_value = AppServerTransport::DEFAULT_LISTEN_URL
     )]
     listen: AppServerTransport,
+
+    /// Session source used to derive product restrictions and metadata.
+    #[arg(
+        long = "session-source",
+        value_name = "SOURCE",
+        default_value = "vscode",
+        value_parser = SessionSource::from_startup_arg
+    )]
+    session_source: SessionSource,
 }
 
 fn main() -> anyhow::Result<()> {
@@ -32,6 +42,7 @@ fn main() -> anyhow::Result<()> {
             ..Default::default()
         };
         let transport = args.listen;
+        let session_source = args.session_source;
 
         run_main_with_transport(
             arg0_paths,
@@ -39,6 +50,7 @@ fn main() -> anyhow::Result<()> {
             loader_overrides,
             /*default_analytics_enabled*/ false,
             transport,
+            session_source,
         )
         .await?;
         Ok(())