Add HyperFrames skills

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011h6NB8JQtfPc6eRCefEzBB

.agents/skills/media-use/audio/scripts/lib/gemini-auth.py

@@ -0,0 +1,52 @@
+"""Obtain Gemini OAuth headers without persisting credentials or tokens."""
+
+import json
+import os
+import sys
+
+# Keep the credential subprocess protocol UTF-8 on every platform.
+for _stream in (sys.stdout, sys.stderr):
+    if hasattr(_stream, "reconfigure"):
+        _stream.reconfigure(encoding="utf-8", errors=_stream.errors)
+
+
+def authenticate():
+    try:
+        from google.auth.transport.requests import Request
+        from google.oauth2 import service_account
+    except ImportError:
+        return {"error": "Service-account auth needs Python packages: pip install google-auth requests"}
+
+    try:
+        path = os.environ.get("GOOGLE_APPLICATION_CREDENTIALS")
+        if path:
+            with open(path, encoding="utf-8") as source:
+                info = json.load(source)
+        else:
+            info = json.loads(os.environ["GCS_CREDS"])
+        if info.get("type") != "service_account":
+            return {"error": "Gemini requires service-account JSON, not user ADC credentials"}
+        # Only exchange credentials with Google's OAuth server.
+        info["token_uri"] = "https://oauth2.googleapis.com/token"
+        credentials = service_account.Credentials.from_service_account_info(
+            info,
+            scopes=[
+                "https://www.googleapis.com/auth/generative-language.retriever",
+            ],
+        )
+        credentials.refresh(Request())
+        project = (
+            os.environ.get("GOOGLE_CLOUD_PROJECT")
+            or os.environ.get("GCLOUD_PROJECT_ID")
+            or info.get("project_id")
+        )
+        return {"token": credentials.token, "project": project}
+    except Exception:
+        # Library exceptions can contain credential data. Never forward them.
+        return {"error": "Gemini service-account authentication failed; check credentials, permissions, and network access"}
+
+
+if __name__ == "__main__":
+    result = authenticate()
+    print(json.dumps(result))
+    sys.exit(1 if "error" in result else 0)