diff --git a/internal/runtime/executor/claude_executor.go b/internal/runtime/executor/claude_executor.go
index ee0dfd80..fb20526b 100644
--- a/internal/runtime/executor/claude_executor.go
+++ b/internal/runtime/executor/claude_executor.go
@@ -551,8 +551,8 @@ func applyClaudeHeaders(r *http.Request, apiKey string, stream bool) {
 	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Arch", "arm64")
 	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Os", "MacOS")
 	misc.EnsureHeader(r.Header, ginHeaders, "X-Stainless-Timeout", "60")
+	misc.EnsureHeader(r.Header, ginHeaders, "User-Agent", "claude-cli/1.0.83 (external, cli)")
 	r.Header.Set("Connection", "keep-alive")
-	r.Header.Set("User-Agent", "claude-cli/1.0.83 (external, cli)")
 	r.Header.Set("Accept-Encoding", "gzip, deflate, br, zstd")
 	if stream {
 		r.Header.Set("Accept", "text/event-stream")
diff --git a/internal/runtime/executor/codex_executor.go b/internal/runtime/executor/codex_executor.go
index 30562c51..e0e04598 100644
--- a/internal/runtime/executor/codex_executor.go
+++ b/internal/runtime/executor/codex_executor.go
@@ -532,6 +532,7 @@ func applyCodexHeaders(r *http.Request, auth *cliproxyauth.Auth, token string) {
 	misc.EnsureHeader(r.Header, ginHeaders, "Version", "0.21.0")
 	misc.EnsureHeader(r.Header, ginHeaders, "Openai-Beta", "responses=experimental")
 	misc.EnsureHeader(r.Header, ginHeaders, "Session_id", uuid.NewString())
+	misc.EnsureHeader(r.Header, ginHeaders, "User-Agent", "codex_cli_rs/0.50.0 (Mac OS 26.0.1; arm64) Apple_Terminal/464")
 
 	r.Header.Set("Accept", "text/event-stream")
 	r.Header.Set("Connection", "Keep-Alive")