Python: Warn when advertised MCP archives are rejected

python/packages/core/agent_framework/_skills.py

@@ -4721,16 +4721,16 @@ async def _download(self, entry: _McpSkillIndexEntry) -> tuple[bytes, str | None
 
         blob = _mcp_first_blob(result)
         if blob is None:
-            logger.debug("Skipping skill '%s': archive resource returned no binary content", entry.name)
+            logger.warning("Skipping skill '%s': archive resource returned no binary content", entry.name)
             return None
 
         data, mime_type = blob
         if not data:
-            logger.debug("Skipping skill '%s': archive resource returned empty content", entry.name)
+            logger.warning("Skipping skill '%s': archive resource returned empty content", entry.name)
             return None
 
         if len(data) > self._max_size_bytes:
-            logger.debug(
+            logger.warning(
                 "Skipping skill '%s': archive resource exceeds the maximum allowed size (%d bytes)",
                 entry.name,
                 self._max_size_bytes,
@@ -4749,7 +4749,9 @@ def _build_skill(self, entry: _McpSkillIndexEntry, data: bytes, mime_type: str |
         """
         archive_format = _detect_archive_format(data, mime_type, entry.url)
         if archive_format is _ArchiveFormat.UNKNOWN:
-            logger.debug("Skipping skill '%s': unsupported archive media type '%s'", entry.name, mime_type or "(none)")
+            logger.warning(
+                "Skipping skill '%s': unsupported archive media type '%s'", entry.name, mime_type or "(none)"
+            )
             return None
 
         try:
@@ -4766,13 +4768,13 @@ def _skill_from_files(self, entry: _McpSkillIndexEntry, files: dict[str, bytes])
         """Assemble an in-memory :class:`FileSkill` from the archive's extracted files."""
         skill_md_key = self._find_skill_md(files)
         if skill_md_key is None:
-            logger.debug("Skipping skill '%s': archive contains no SKILL.md", entry.name)
+            logger.warning("Skipping skill '%s': archive contains no SKILL.md", entry.name)
             return None
 
         try:
             content = files[skill_md_key].decode("utf-8")
         except UnicodeDecodeError:
-            logger.debug("Skipping skill '%s': SKILL.md is not valid UTF-8", entry.name)
+            logger.warning("Skipping skill '%s': SKILL.md is not valid UTF-8", entry.name)
             return None
 
         frontmatter = FileSkillsSource._extract_frontmatter(  # pyright: ignore[reportPrivateUsage]
@@ -4782,7 +4784,7 @@ def _skill_from_files(self, entry: _McpSkillIndexEntry, files: dict[str, bytes])
             return None
 
         if frontmatter.name != entry.name:
-            logger.debug(
+            logger.warning(
                 "Skipping skill '%s': SKILL.md frontmatter name '%s' does not match the advertised entry name",
                 entry.name,
                 frontmatter.name,

python/packages/core/tests/core/test_mcp_skills.py

@@ -917,6 +917,23 @@ async def test_frontmatter_name_mismatch_is_skipped(self) -> None:
         skills = await source.get_skills(_SOURCE_CTX)
         assert skills == []
 
+    async def test_frontmatter_name_mismatch_is_logged_as_warning(self, caplog: pytest.LogCaptureFixture) -> None:
+        url = "skill://archives/packaged-skill.zip"
+        index = _make_archive_index("packaged-skill", url)
+        mismatched = ARCHIVE_SKILL_MD.replace("name: packaged-skill", "name: different-name")
+        archive = _make_zip({"SKILL.md": mismatched.encode()})
+        client = _archive_client(index, url, archive, "application/zip")
+
+        source = MCPSkillsSource(client=client)
+        with caplog.at_level("WARNING", logger="agent_framework._skills"):
+            skills = await source.get_skills(_SOURCE_CTX)
+
+        assert skills == []
+        assert any(
+            record.levelname == "WARNING" and "does not match the advertised entry name" in record.message
+            for record in caplog.records
+        )
+
     @pytest.mark.asyncio
     async def test_archive_without_skill_md_is_skipped(self) -> None:
         url = "skill://archives/packaged-skill.zip"