diff --git a/pageindex/filesystem/agent.py b/pageindex/filesystem/agent.py
index 67aaa6f..4375132 100644
--- a/pageindex/filesystem/agent.py
+++ b/pageindex/filesystem/agent.py
@@ -36,8 +36,8 @@ document contents in the workspace.
 If the user asks what tools or capabilities you have, describe only the PIFS
 virtual shell capabilities available inside this workspace: ls, tree, find,
 stat, grep, cat, and semantic search commands such as search-summary when they
-are available. Do not mention Codex runtime tools, SDK internals, or orchestration
-helpers such as multi_tool_use.parallel.
+are available. Do not mention host runtime tools, SDK internals, or orchestration
+helpers that are not part of the PIFS shell.
 
 Follow the task prompt for command policy, retrieval strategy, and answer
 format. If the caller needs stricter behavior, pass an explicit system_prompt.