feat: support Standard Schema for tool/prompt schemas (#1689)

Co-authored-by: Matt Carey <mcarey@cloudflare.com>

examples/server/src/arktypeExample.ts

@@ -0,0 +1,28 @@
+#!/usr/bin/env node
+/**
+ * Minimal MCP server using ArkType for schema validation.
+ * ArkType implements the Standard Schema spec with built-in JSON Schema conversion.
+ */
+
+import { McpServer, StdioServerTransport } from '@modelcontextprotocol/server';
+import { type } from 'arktype';
+
+const server = new McpServer({
+    name: 'arktype-example',
+    version: '1.0.0'
+});
+
+// Register a tool with ArkType schema
+server.registerTool(
+    'greet',
+    {
+        description: 'Generate a greeting',
+        inputSchema: type({ name: 'string' })
+    },
+    async ({ name }) => ({
+        content: [{ type: 'text', text: `Hello, ${name}!` }]
+    })
+);
+
+const transport = new StdioServerTransport();
+await server.connect(transport);

examples/server/src/valibotExample.ts

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+/**
+ * Minimal MCP server using Valibot for schema validation.
+ * Use toStandardJsonSchema() from @valibot/to-json-schema to create
+ * StandardJSONSchemaV1-compliant schemas.
+ */
+
+import { McpServer, StdioServerTransport } from '@modelcontextprotocol/server';
+import { toStandardJsonSchema } from '@valibot/to-json-schema';
+import * as v from 'valibot';
+
+const server = new McpServer({
+    name: 'valibot-example',
+    version: '1.0.0'
+});
+
+// Register a tool with Valibot schema
+server.registerTool(
+    'greet',
+    {
+        description: 'Generate a greeting',
+        inputSchema: toStandardJsonSchema(v.object({ name: v.string() }))
+    },
+    async ({ name }) => ({
+        content: [{ type: 'text', text: `Hello, ${name}!` }]
+    })
+);
+
+const transport = new StdioServerTransport();
+await server.connect(transport);