Sanitize generated pricing fields

tests/test_builder_prompt.py

@@ -12,7 +12,7 @@ from agent_builder.builder import (
     _with_builder_skills,
 )
 from agent_builder.config import Settings
-from agent_builder.tools import A2A_PACK_MIN_VERSION
+from agent_builder.tools import A2A_PACK_MIN_VERSION, _strip_unsupported_pricing_fields
 from deepagents.backends import StateBackend
 from agent import _build_failure_error
 
@@ -68,6 +68,48 @@ class BuilderPromptTests(unittest.TestCase):
         self.assertIn("caller_pays_llm=False", files["a2apack-agent-authoring/SKILL.md"])
         self.assertIn("ctx.llm.api_key", files["agent-quality-review/SKILL.md"])
 
+    def test_prompt_rejects_platform_derived_pricing_fields(self) -> None:
+        self.assertIn("runtime.pricing.compute", SYSTEM_PROMPT)
+        self.assertIn("runtime.pricing.total_usd", SYSTEM_PROMPT)
+        self.assertIn("price_per_call_usd", SYSTEM_PROMPT)
+
+        files = _builder_skill_files()
+        for path in (
+            "a2apack-agent-authoring/SKILL.md",
+            "agent-quality-review/SKILL.md",
+        ):
+            self.assertIn("runtime.pricing.compute", files[path])
+            self.assertIn("runtime.pricing.total_usd", files[path])
+            self.assertIn("compute=", files[path])
+            self.assertIn("total_usd=", files[path])
+
+    def test_pricing_sanitizer_removes_derived_agent_card_fields(self) -> None:
+        source = '''
+from a2a_pack import Pricing
+
+pricing = Pricing(
+    price_per_call_usd=0.05,
+    compute={
+        "cpu_usd": 0.000833,
+        "memory_usd": 0.00018,
+    },
+    total_usd=0.10125,
+    caller_pays_llm=False,
+    notes="caller gets the real billing projection from the platform",
+)
+
+inline = Pricing(price_per_call_usd=0.01, compute={"runtime_seconds": 600}, total_usd=0.02, caller_pays_llm=False)
+'''
+
+        sanitized, removed = _strip_unsupported_pricing_fields(source)
+
+        self.assertEqual(set(removed), {"compute", "total_usd"})
+        self.assertIn("price_per_call_usd=0.05", sanitized)
+        self.assertIn("caller_pays_llm=False", sanitized)
+        self.assertNotIn("compute=", sanitized)
+        self.assertNotIn("total_usd=", sanitized)
+        compile(sanitized, "agent.py", "exec")
+
     def test_prompt_requires_resource_mirror_for_heavy_agents(self) -> None:
         self.assertIn("declare resources in BOTH places", SYSTEM_PROMPT)
         self.assertIn("resources = Resources", SYSTEM_PROMPT)