Include instructions in MCP inspect output (#4873)

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fastmcp_slim/fastmcp/utilities/inspect.py

@@ -489,6 +489,7 @@ async def format_mcp_info(mcp: FastMCP[Any] | SDKServer) -> bytes:
                 "mcp": importlib.metadata.version("mcp"),  # MCP protocol version
             },
             "serverInfo": server_info,
+            "instructions": client.initialize_result.instructions,
             "capabilities": {},  # MCP format doesn't include capabilities at top level
             "tools": tools_result.tools,
             "prompts": prompts_result.prompts,

tests/utilities/test_inspect_icons.py

@@ -425,6 +425,7 @@ class TestFormatFunctions:
 
         # Check server version in MCP format
         assert data["serverInfo"]["version"] == "2.0.0"
+        assert data["instructions"] == "Test instructions"
 
         # MCP format SHOULD have environment fields
         assert "environment" in data