fix: keep builder artifacts inside workspace grant

agent_builder/builder.py

@@ -17,6 +17,7 @@ from .tools import ToolContext, build_tools
 
 BUILDER_SKILL_SOURCE = "/.agent-builder/skills/"
 _BUILDER_SKILL_NAMESPACE = ("agent-builder", "skills")
+_BUILDER_ARTIFACT_DIR = ".agent-builder"
 
 
 @dataclass(frozen=True)
@@ -324,7 +325,10 @@ def _build_project_backend(ctx: BuilderContext, *, settings: Settings) -> Any |
             from a2a_pack.deepagents import WorkspaceBackend
         except Exception:  # noqa: BLE001
             return _with_builder_skills(StateBackend())
-        return _with_builder_skills(WorkspaceBackend(ctx.workspace))
+        return _with_builder_skills(
+            WorkspaceBackend(ctx.workspace),
+            artifacts_root=f"/{prefix}/{_BUILDER_ARTIFACT_DIR}",
+        )
     try:
         from a2a_pack import Grant, WorkspaceAccess, WorkspaceMode
         from a2a_pack.deepagents import WorkspaceBackend
@@ -357,10 +361,13 @@ def _build_project_backend(ctx: BuilderContext, *, settings: Settings) -> Any |
             write_prefixes=(f"{prefix}/", "outputs/"),
         )
     )
-    return _with_builder_skills(WorkspaceBackend(workspace))
+    return _with_builder_skills(
+        WorkspaceBackend(workspace),
+        artifacts_root=f"/{prefix}/{_BUILDER_ARTIFACT_DIR}",
+    )
 
 
-def _with_builder_skills(default_backend: Any) -> Any:
+def _with_builder_skills(default_backend: Any, *, artifacts_root: str = "/") -> Any:
     skill_store = InMemoryStore()
     for path, content in _builder_skill_files().items():
         skill_store.put(
@@ -375,6 +382,7 @@ def _with_builder_skills(default_backend: Any) -> Any:
     return CompositeBackend(
         default=default_backend,
         routes={BUILDER_SKILL_SOURCE: skill_backend},
+        artifacts_root=artifacts_root,
     )
 
 

agent_builder/tools.py

@@ -28,7 +28,7 @@ if TYPE_CHECKING:
     from .config import Settings
 
 
-A2A_PACK_MIN_VERSION = "0.1.32"
+A2A_PACK_MIN_VERSION = "0.1.33"
 
 
 @dataclass(frozen=True)