diff --git a/core/context_builder.py b/core/context_builder.py
index da2cf9f..76d13d4 100644
--- a/core/context_builder.py
+++ b/core/context_builder.py
@@ -205,6 +205,12 @@ def format_prompt(context: dict, role: str, prompt_template: str | None = None)
             sections.append(f"Spec: {json.dumps(task['spec'], ensure_ascii=False)}")
         sections.append("")
 
+    # Acceptance criteria — shown as a dedicated section so agents use it for completeness check
+    if task and task.get("acceptance_criteria"):
+        sections.append("## Acceptance Criteria")
+        sections.append(task["acceptance_criteria"])
+        sections.append("")
+
     # Decisions
     decisions = context.get("decisions")
     if decisions: