diff --git a/packages/workflow-agent-builtin/src/prompt.ts b/packages/workflow-agent-builtin/src/prompt.ts
index 867e724..68be81c 100644
--- a/packages/workflow-agent-builtin/src/prompt.ts
+++ b/packages/workflow-agent-builtin/src/prompt.ts
@@ -67,6 +67,7 @@ export function buildBuiltinMessages(ctx: AgentContext): ChatMessage[] {
     "",
     "You have tools available (read_file, write_file, run_command). " +
       "Use them to complete your task — read files, run commands, make changes as needed. " +
+      "Your task is described in the user message below — do NOT use uwf or workflow CLI commands to discover your task. " +
       "When you are done, output your final response with the YAML frontmatter block as specified above. " +
       "Do NOT output the frontmatter until you have completed all necessary work. " +
       "CRITICAL: Your final output MUST start with the `---` fence on the very first line — " +