fix(client): cache authEnvKeys results to reduce allocations

CHANGELOG.md

@@ -22,6 +22,7 @@ Repo: https://github.com/openclaw/acpx
 
 - Sessions/load: fall back to a fresh ACP session when adapters reject `session/load` with JSON-RPC `-32601` or `-32602`, so persistent session reconnects do not crash on partial load support. (#174) Thanks @Bortlesboat.
 - Flows/runtime: finalize interrupted `flow run` bundles as failed instead of leaving them stuck at `running` when the process receives `SIGHUP`, `SIGINT`, or `SIGTERM`.
+- Client/auth: cache derived auth env key lists per auth method to avoid repeated allocations during credential lookup. (#167) Thanks @Yuan-ManX.
 
 ## 2026.3.12 (v0.3.0)
 

src/client.ts

@@ -664,7 +664,7 @@ function toEnvToken(value: string): string {
     .toUpperCase();
 }
 
-function authEnvKeys(methodId: string): string[] {
+function buildAuthEnvKeys(methodId: string): string[] {
   const token = toEnvToken(methodId);
   const keys = new Set<string>([methodId]);
   if (token) {
@@ -674,6 +674,18 @@ function authEnvKeys(methodId: string): string[] {
   return [...keys];
 }
 
+const authEnvKeysCache = new Map<string, string[]>();
+
+function authEnvKeys(methodId: string): string[] {
+  const cached = authEnvKeysCache.get(methodId);
+  if (cached) {
+    return cached;
+  }
+  const keys = buildAuthEnvKeys(methodId);
+  authEnvKeysCache.set(methodId, keys);
+  return keys;
+}
+
 function readEnvCredential(methodId: string): string | undefined {
   for (const key of authEnvKeys(methodId)) {
     const value = process.env[key];