Rebuild agent-builder on a2a-pack 0.1.51

tests/test_builder_prompt.py

@@ -14,6 +14,7 @@ from agent_builder.builder import (
 from agent_builder.config import Settings
 from agent_builder.tools import A2A_PACK_MIN_VERSION
 from deepagents.backends import StateBackend
+from agent import _build_failure_error
 
 
 class BuilderPromptTests(unittest.TestCase):
@@ -132,6 +133,13 @@ class BuilderPromptTests(unittest.TestCase):
         for skill_name in expected:
             self.assertIn(f"{BUILDER_SKILL_SOURCE}{skill_name}/", paths)
 
+    def test_build_failure_error_classifies_budget_exhaustion(self) -> None:
+        self.assertEqual(
+            _build_failure_error(RuntimeError("Budget has been exceeded! Key=abc")),
+            "LLM budget exceeded before deployment; retry with a larger budget "
+            "or a smaller build scope",
+        )
+
     def test_project_backend_keeps_deepagents_artifacts_inside_project_grant(self) -> None:
         backend = _build_project_backend(
             BuilderContext(