Merge pull request #17 from modelcontextprotocol/ochafik/add-elicitation-tool

Add elicitInputs tool to MCP server

Author: bhosmer-ant

src/modules/mcp/services/mcp.ts

@@ -4,6 +4,7 @@ import {
   CompleteRequestSchema,
   CreateMessageRequest,
   CreateMessageResultSchema,
+  ElicitResultSchema,
   GetPromptRequestSchema,
   ListPromptsRequestSchema,
   ListResourcesRequestSchema,
@@ -87,6 +88,7 @@ enum ToolName {
   GET_TINY_IMAGE = "getTinyImage",
   ANNOTATED_MESSAGE = "annotatedMessage",
   GET_RESOURCE_REFERENCE = "getResourceReference",
+  ELICIT_INPUTS = "elicitInputs",
 }
 
 enum PromptName {
@@ -446,12 +448,18 @@ export const createMcpServer = (): McpServerWrapper => {
           "Returns a resource reference that can be used by MCP clients",
         inputSchema: zodToJsonSchema(GetResourceReferenceSchema) as ToolInput,
       },
+      {
+        name: ToolName.ELICIT_INPUTS,
+        description:
+          "Elicitation test tool that demonstrates how to request user input with various field types",
+        inputSchema: { type: "object" , properties: {} },
+      },
     ];
 
     return { tools };
   });
 
-  server.setRequestHandler(CallToolRequestSchema, async (request) => {
+  server.setRequestHandler(CallToolRequestSchema, async (request, extra) => {
     const { name, arguments: args } = request.params;
 
     if (name === ToolName.ECHO) {
@@ -624,6 +632,90 @@ export const createMcpServer = (): McpServerWrapper => {
       return { content };
     }
 
+    if (name === ToolName.ELICIT_INPUTS) {
+      const result = await extra.sendRequest({
+        method: 'elicitation/create',
+        params: {
+          message: "Please provide inputs for the following fields:",
+          requestedSchema: {
+            type: "object",
+            properties: {
+              name: {
+                title: "Full Name",
+                type: "string",
+                description: "Your full, legal name",
+              },
+              check: {
+                title: "Agree to terms",
+                type: "boolean",
+                description: "A boolean check",
+              },
+              color: {
+                title: "Favorite Color",
+                type: "string",
+                description: "Favorite color (open text)",
+                default: "blue",
+              },
+              email: {
+                title: "Email Address",
+                type: "string",
+                format: "email",
+                description:
+                  "Your email address (will be verified, and never shared with anyone else)",
+              },
+              homepage: {
+                type: "string",
+                format: "uri",
+                description: "Homepage / personal site",
+              },
+              birthdate: {
+                title: "Birthdate",
+                type: "string",
+                format: "date",
+                description:
+                  "Your date of birth (will never be shared with anyone else)",
+              },
+              integer: {
+                title: "Favorite Integer",
+                type: "integer",
+                description:
+                  "Your favorite integer (do not give us your phone number, pin, or other sensitive info)",
+                minimum: 1,
+                maximum: 100,
+                default: 42,
+              },
+              number: {
+                title: "Favorite Number",
+                type: "number",
+                description: "Favorite number (there are no wrong answers)",
+                minimum: 0,
+                maximum: 1000,
+                default: 3.14,
+              },
+              petType: {
+                title: "Pet type",
+                type: "string",
+                enum: ["cats", "dogs", "birds", "fish", "reptiles"],
+                enumNames: ["Cats", "Dogs", "Birds", "Fish", "Reptiles"],
+                default: "dogs",
+                description: "Your favorite pet type",
+              },
+            },
+            required: ["name"],
+          },
+        }
+      }, ElicitResultSchema, {timeout: 10 * 60 * 1000 /* 10 minutes */});
+
+      return {
+        content: [
+          {
+            type: "text",
+            text: `Elicitation result: ${JSON.stringify(result, null, 2)}`,
+          },
+        ],
+      };
+    }
+
     throw new Error(`Unknown tool: ${name}`);
   });