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src/main/java/spring/ai/mcp/McpFunctionCallback.java

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+/*
+* Copyright 2024 - 2024 the original author or authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* https://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+package spring.ai.mcp;
+
+import java.util.Map;
+
+import spring.ai.mcp.client.McpClient;
+import spring.ai.mcp.spec.McpSchema.CallToolRequest;
+import spring.ai.mcp.spec.McpSchema.CallToolResult;
+import spring.ai.mcp.spec.McpSchema.Tool;
+
+import org.springframework.ai.model.ModelOptionsUtils;
+import org.springframework.ai.model.function.FunctionCallback;
+
+/**
+ * @author Christian Tzolov
+ * @since 1.0.0
+ */
+
+public class McpFunctionCallback implements FunctionCallback {
+
+	private final McpClient mcpClient;
+
+	private final Tool tool;
+
+	public McpFunctionCallback(McpClient clientSession, Tool tool) {
+		this.mcpClient = clientSession;
+		this.tool = tool;
+	}
+
+	@Override
+	public String getName() {
+		return this.tool.name();
+	}
+
+	@Override
+	public String getDescription() {
+		return this.tool.description();
+	}
+
+	@Override
+	public String getInputTypeSchema() {
+		return ModelOptionsUtils.toJsonString(this.tool.inputSchema());
+	}
+
+	@Override
+	public String call(String functionInput) {
+		Map<String, Object> arguments = ModelOptionsUtils.jsonToMap(functionInput);
+		CallToolResult response = this.mcpClient.callTool(new CallToolRequest(this.getName(), arguments));
+		// Todo handle errors
+		return ModelOptionsUtils.toJsonString(response.content());
+	}
+
+}