diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bf9f5e..e942d41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `claude_read_skill` path traversal: added `canonicalize()` + `starts_with()` validation to prevent reading arbitrary files via crafted skill paths (lib.rs)
 
 ### Fixed
+- Sidecar env var stripping now whitelists `CLAUDE_CODE_EXPERIMENTAL_*` vars (both Rust sidecar.rs and JS agent-runner.ts) — previously all `CLAUDE*` vars were stripped, blocking feature flags like agent teams from reaching the SDK (sidecar.rs, agent-runner.ts)
 - E2E terminal tab tests: scoped selectors to `.tab-bar .tab-title` (was `.tab-title` which matched project tabs), used `browser.execute()` for DOM text reads to avoid stale element issues (bterminal.test.ts)
 - E2E wdio.conf.js: added `wdio:enforceWebDriverClassic: true` to disable BiDi negotiation (wdio v9 injects `webSocketUrl:true` which tauri-driver rejects), removed unnecessary `browserName: 'wry'`, fixed binary path to Cargo workspace target dir (`v2/target/debug/` not `v2/src-tauri/target/debug/`)
 - E2E consolidated to single spec file: Tauri creates one app session per spec file; multiple files caused "invalid session id" on 2nd+ file (wdio.conf.js, bterminal.test.ts)
diff --git a/v2/bterminal-core/src/sidecar.rs b/v2/bterminal-core/src/sidecar.rs
index bc6e5f6..34a851b 100644
--- a/v2/bterminal-core/src/sidecar.rs
+++ b/v2/bterminal-core/src/sidecar.rs
@@ -66,10 +66,13 @@ impl SidecarManager {
 
         log::info!("Starting sidecar: {} {}", cmd.program, cmd.args.join(" "));
 
-        // Build a clean environment stripping all CLAUDE* vars to prevent
-        // the SDK from detecting nesting when BTerminal is launched from a Claude Code terminal
+        // Build a clean environment stripping CLAUDE* vars to prevent
+        // the SDK from detecting nesting when BTerminal is launched from a Claude Code terminal.
+        // Whitelist CLAUDE_CODE_EXPERIMENTAL_* so feature flags (e.g. agent teams) pass through.
         let clean_env: Vec<(String, String)> = std::env::vars()
-            .filter(|(k, _)| !k.starts_with("CLAUDE"))
+            .filter(|(k, _)| {
+                !k.starts_with("CLAUDE") || k.starts_with("CLAUDE_CODE_EXPERIMENTAL_")
+            })
             .collect();
 
         let mut child = Command::new(&cmd.program)
diff --git a/v2/sidecar/agent-runner.ts b/v2/sidecar/agent-runner.ts
index f8b4125..4d648fd 100644
--- a/v2/sidecar/agent-runner.ts
+++ b/v2/sidecar/agent-runner.ts
@@ -83,10 +83,13 @@ async function handleQuery(msg: QueryMessage) {
 
   const controller = new AbortController();
 
-  // Strip CLAUDE* env vars to prevent nesting detection by the spawned CLI
+  // Strip CLAUDE* and ANTHROPIC_* env vars to prevent nesting detection by the spawned CLI.
+  // Whitelist CLAUDE_CODE_EXPERIMENTAL_* so feature flags (e.g. agent teams) pass through.
   const cleanEnv: Record<string, string | undefined> = {};
   for (const [key, value] of Object.entries(process.env)) {
-    if (!key.startsWith('CLAUDE') && !key.startsWith('ANTHROPIC_')) {
+    if (key.startsWith('CLAUDE_CODE_EXPERIMENTAL_')) {
+      cleanEnv[key] = value;
+    } else if (!key.startsWith('CLAUDE') && !key.startsWith('ANTHROPIC_')) {
       cleanEnv[key] = value;
     }
   }