Support MCP in packaged Python runtime

python/sdk/tests/test_smoke_model.py

@@ -30,3 +30,44 @@ def test_child_prompt_precedes_runtime_context(prompt_name: str, expected: str)
         for chunk in chunks
         for choice in chunk.get("choices", [])
     )
+
+
+def test_mcp_smoke_requests_the_discovered_tool() -> None:
+    chunks = SMOKE["completion_chunks"]({
+        "messages": [{"role": "user", "content": SMOKE["MCP_PROMPT"]}],
+        "tools": [{"type": "function", "function": {"name": "mcp__fixture__add"}}],
+    })
+
+    calls = [
+        call
+        for chunk in chunks
+        for choice in chunk.get("choices", [])
+        for call in choice.get("delta", {}).get("tool_calls", [])
+    ]
+    assert calls[0]["function"] == {
+        "name": "mcp__fixture__add",
+        "arguments": '{"a": 19, "b": 23}',
+    }
+
+
+def test_mcp_smoke_accepts_the_external_server_result() -> None:
+    chunks = SMOKE["completion_chunks"]({
+        "messages": [
+            {"role": "user", "content": SMOKE["MCP_PROMPT"]},
+            {
+                "role": "assistant",
+                "tool_calls": [{
+                    "id": "mcp-add",
+                    "type": "function",
+                    "function": {"name": "mcp__fixture__add", "arguments": '{}'},
+                }],
+            },
+            {"role": "tool", "tool_call_id": "mcp-add", "content": "42"},
+        ],
+    })
+
+    assert any(
+        choice.get("delta", {}).get("content") == SMOKE["MCP_TEXT"]
+        for chunk in chunks
+        for choice in chunk.get("choices", [])
+    )