Add /interop endpoint to Tool Shed tools API.

Mirror Galaxy's /api/tools/{id}/versions/{v}/interop on the Tool Shed so
galaxy-tool-cache can fetch a tool's parsed model from either service with
the same URL shape. Returns ShedParsedTool, same as the bare versioned path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/tool_shed/test/functional/test_shed_tools.py

@@ -70,6 +70,20 @@ class TestShedToolsApi(ShedApiTestCase):
         tool_response = self.api_interactor.get(url)
         tool_response.raise_for_status()
 
+    def test_tool_interop(self):
+        populator = self.populator
+        repository = populator.setup_column_maker_repo(prefix="toolinterop")
+        tool_id = populator.tool_guid(self, repository, "Add_a_column1")
+        tool_shed_base, encoded_tool_id = encode_identifier(tool_id)
+        url = f"tools/{encoded_tool_id}/versions/1.1.0/interop"
+        tool_response = self.api_interactor.get(url)
+        tool_response.raise_for_status()
+        parsed = tool_response.json()
+        assert parsed["id"] == "Add_a_column1"
+        assert parsed["version"] == "1.1.0"
+        assert "inputs" in parsed
+        assert "outputs" in parsed
+
     def test_tool_source(self):
         populator = self.populator
         repository = populator.setup_column_maker_repo(prefix="toolsource")

lib/tool_shed/webapp/api2/tools.py

@@ -155,6 +155,19 @@ class FastAPITools:
     ) -> ShedParsedTool:
         return parsed_tool_model_cached_for(trans, tool_id, tool_version)
 
+    @router.get(
+        "/api/tools/{tool_id}/versions/{tool_version}/interop",
+        operation_id="tools__interop",
+        summary="Return Galaxy's meta model description of the tool's metadata, inputs, and outputs.",
+    )
+    def interop(
+        self,
+        trans: SessionRequestContext = DependsOnTrans,
+        tool_id: str = TOOL_ID_PATH_PARAM,
+        tool_version: str = TOOL_VERSION_PATH_PARAM,
+    ) -> ShedParsedTool:
+        return parsed_tool_model_cached_for(trans, tool_id, tool_version)
+
     @router.get(
         "/api/tools/{tool_id}/versions/{tool_version}/parameter_request_schema",
         operation_id="tools__parameter_request_schema",