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198
README.md
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@ -11,6 +11,7 @@
- [Resources](#resources)
- [Tools](#tools)
- [Prompts](#prompts)
- [Completions](#completions)
- [Running Your Server](#running-your-server)
- [stdio](#stdio)
- [Streamable HTTP](#streamable-http)
@ -150,6 +151,33 @@ server.registerResource(
}]
})
);
// Resource with context-aware completion
server.registerResource(
"repository",
new ResourceTemplate("github://repos/{owner}/{repo}", {
list: undefined,
complete: {
// Provide intelligent completions based on previously resolved parameters
repo: (value, context) => {
if (context?.arguments?.["owner"] === "org1") {
return ["project1", "project2", "project3"].filter(r => r.startsWith(value));
}
return ["default-repo"].filter(r => r.startsWith(value));
}
}
}),
{
title: "GitHub Repository",
description: "Repository information"
},
async (uri, { owner, repo }) => ({
contents: [{
uri: uri.href,
text: `Repository: ${owner}/${repo}`
}]
})
);
```
### Tools
@ -233,12 +261,14 @@ Tools can return `ResourceLink` objects to reference resources without embedding
Prompts are reusable templates that help LLMs interact with your server effectively:
```typescript
import { completable } from "@modelcontextprotocol/sdk/server/completable.js";
server.registerPrompt(
"review-code",
{
title: "Code Review",
description: "Review code for best practices and potential issues",
arguments: { code: z.string() }
argsSchema: { code: z.string() }
},
({ code }) => ({
messages: [{
@ -250,6 +280,68 @@ server.registerPrompt(
}]
})
);
// Prompt with context-aware completion
server.registerPrompt(
"team-greeting",
{
title: "Team Greeting",
description: "Generate a greeting for team members",
argsSchema: {
department: completable(z.string(), (value) => {
// Department suggestions
return ["engineering", "sales", "marketing", "support"].filter(d => d.startsWith(value));
}),
name: completable(z.string(), (value, context) => {
// Name suggestions based on selected department
const department = context?.arguments?.["department"];
if (department === "engineering") {
return ["Alice", "Bob", "Charlie"].filter(n => n.startsWith(value));
} else if (department === "sales") {
return ["David", "Eve", "Frank"].filter(n => n.startsWith(value));
} else if (department === "marketing") {
return ["Grace", "Henry", "Iris"].filter(n => n.startsWith(value));
}
return ["Guest"].filter(n => n.startsWith(value));
})
}
},
({ department, name }) => ({
messages: [{
role: "assistant",
content: {
type: "text",
text: `Hello ${name}, welcome to the ${department} team!`
}
}]
})
);
```
### Completions
MCP supports argument completions to help users fill in prompt arguments and resource template parameters. See the examples above for [resource completions](#resources) and [prompt completions](#prompts).
#### Client Usage
```typescript
// Request completions for any argument
const result = await client.complete({
ref: {
type: "ref/prompt", // or "ref/resource"
name: "example" // or uri: "template://..."
},
argument: {
name: "argumentName",
value: "partial" // What the user has typed so far
},
context: { // Optional: Include previously resolved arguments
arguments: {
previousArg: "value"
}
}
});
```
### Display Names and Metadata
@ -772,6 +864,109 @@ const transport = new StdioServerTransport();
await server.connect(transport);
```
### Eliciting User Input
MCP servers can request additional information from users through the elicitation feature. This is useful for interactive workflows where the server needs user input or confirmation:
```typescript
// Server-side: Restaurant booking tool that asks for alternatives
server.tool(
"book-restaurant",
{
restaurant: z.string(),
date: z.string(),
partySize: z.number()
},
async ({ restaurant, date, partySize }) => {
// Check availability
const available = await checkAvailability(restaurant, date, partySize);
if (!available) {
// Ask user if they want to try alternative dates
const result = await server.server.elicitInput({
message: `No tables available at ${restaurant} on ${date}. Would you like to check alternative dates?`,
requestedSchema: {
type: "object",
properties: {
checkAlternatives: {
type: "boolean",
title: "Check alternative dates",
description: "Would you like me to check other dates?"
},
flexibleDates: {
type: "string",
title: "Date flexibility",
description: "How flexible are your dates?",
enum: ["next_day", "same_week", "next_week"],
enumNames: ["Next day", "Same week", "Next week"]
}
},
required: ["checkAlternatives"]
}
});
if (result.action === "accept" && result.content?.checkAlternatives) {
const alternatives = await findAlternatives(
restaurant,
date,
partySize,
result.content.flexibleDates as string
);
return {
content: [{
type: "text",
text: `Found these alternatives: ${alternatives.join(", ")}`
}]
};
}
return {
content: [{
type: "text",
text: "No booking made. Original date not available."
}]
};
}
// Book the table
await makeBooking(restaurant, date, partySize);
return {
content: [{
type: "text",
text: `Booked table for ${partySize} at ${restaurant} on ${date}`
}]
};
}
);
```
Client-side: Handle elicitation requests
```typescript
// This is a placeholder - implement based on your UI framework
async function getInputFromUser(message: string, schema: any): Promise<{
action: "accept" | "decline" | "cancel";
data?: Record<string, any>;
}> {
// This should be implemented depending on the app
throw new Error("getInputFromUser must be implemented for your platform");
}
client.setRequestHandler(ElicitRequestSchema, async (request) => {
const userResponse = await getInputFromUser(
request.params.message,
request.params.requestedSchema
);
return {
action: userResponse.action,
content: userResponse.action === "accept" ? userResponse.data : undefined
};
});
```
**Note**: Elicitation requires client support. Clients must declare the `elicitation` capability during initialization.
### Writing MCP Clients
The SDK provides a high-level client interface:
@ -820,6 +1015,7 @@ const result = await client.callTool({
arg1: "value"
}
});
```
### Proxy Authorization Requests Upstream

4
package-lock.json generated
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@ -1,12 +1,12 @@
{
"name": "@modelcontextprotocol/sdk",
"version": "1.11.4",
"version": "1.12.3",
"lockfileVersion": 3,
"requires": true,
"packages": {
"": {
"name": "@modelcontextprotocol/sdk",
"version": "1.11.4",
"version": "1.12.3",
"license": "MIT",
"dependencies": {
"ajv": "^6.12.6",

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@ -1,3 +1,4 @@
import { LATEST_PROTOCOL_VERSION } from '../types.js';
import {
discoverOAuthMetadata,
startAuthorization,
@ -202,7 +203,7 @@ describe("OAuth Authorization", () => {
const [url, options] = calls[0];
expect(url.toString()).toBe("https://auth.example.com/.well-known/oauth-authorization-server");
expect(options.headers).toEqual({
"MCP-Protocol-Version": "2025-03-26"
"MCP-Protocol-Version": LATEST_PROTOCOL_VERSION
});
});

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@ -14,6 +14,7 @@ import {
ListToolsRequestSchema,
CallToolRequestSchema,
CreateMessageRequestSchema,
ElicitRequestSchema,
ListRootsRequestSchema,
ErrorCode,
} from "../types.js";
@ -597,6 +598,43 @@ test("should only allow setRequestHandler for declared capabilities", () => {
}).toThrow("Client does not support roots capability");
});
test("should allow setRequestHandler for declared elicitation capability", () => {
const client = new Client(
{
name: "test-client",
version: "1.0.0",
},
{
capabilities: {
elicitation: {},
},
},
);
// This should work because elicitation is a declared capability
expect(() => {
client.setRequestHandler(ElicitRequestSchema, () => ({
action: "accept",
content: {
username: "test-user",
confirmed: true,
},
}));
}).not.toThrow();
// This should throw because sampling is not a declared capability
expect(() => {
client.setRequestHandler(CreateMessageRequestSchema, () => ({
model: "test-model",
role: "assistant",
content: {
type: "text",
text: "Test response",
},
}));
}).toThrow("Client does not support sampling capability");
});
/***
* Test: Type Checking
* Test that custom request/notification/result schemas can be used with the Client class.

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@ -307,6 +307,14 @@ export class Client<
}
break;
case "elicitation/create":
if (!this._capabilities.elicitation) {
throw new Error(
`Client does not support elicitation capability (required for ${method})`,
);
}
break;
case "roots/list":
if (!this._capabilities.roots) {
throw new Error(

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@ -14,11 +14,13 @@ import {
ListResourcesResultSchema,
LoggingMessageNotificationSchema,
ResourceListChangedNotificationSchema,
ElicitRequestSchema,
ResourceLink,
ReadResourceRequest,
ReadResourceResultSchema,
ResourceLink,
} from '../../types.js';
import { getDisplayName } from '../../shared/metadataUtils.js';
import Ajv from "ajv";
// Create readline interface for user input
const readline = createInterface({
@ -58,6 +60,7 @@ function printHelp(): void {
console.log(' call-tool <name> [args] - Call a tool with optional JSON arguments');
console.log(' greet [name] - Call the greet tool');
console.log(' multi-greet [name] - Call the multi-greet tool with notifications');
console.log(' collect-info [type] - Test elicitation with collect-user-info tool (contact/preferences/feedback)');
console.log(' start-notifications [interval] [count] - Start periodic notifications');
console.log(' run-notifications-tool-with-resumability [interval] [count] - Run notification tool with resumability');
console.log(' list-prompts - List available prompts');
@ -120,6 +123,10 @@ function commandLoop(): void {
await callMultiGreetTool(args[1] || 'MCP User');
break;
case 'collect-info':
await callCollectInfoTool(args[1] || 'contact');
break;
case 'start-notifications': {
const interval = args[1] ? parseInt(args[1], 10) : 2000;
const count = args[2] ? parseInt(args[2], 10) : 10;
@ -204,15 +211,212 @@ async function connect(url?: string): Promise<void> {
console.log(`Connecting to ${serverUrl}...`);
try {
// Create a new client
// Create a new client with elicitation capability
client = new Client({
name: 'example-client',
version: '1.0.0'
}, {
capabilities: {
elicitation: {},
},
});
client.onerror = (error) => {
console.error('\x1b[31mClient error:', error, '\x1b[0m');
}
// Set up elicitation request handler with proper validation
client.setRequestHandler(ElicitRequestSchema, async (request) => {
console.log('\n🔔 Elicitation Request Received:');
console.log(`Message: ${request.params.message}`);
console.log('Requested Schema:');
console.log(JSON.stringify(request.params.requestedSchema, null, 2));
const schema = request.params.requestedSchema;
const properties = schema.properties;
const required = schema.required || [];
// Set up AJV validator for the requested schema
const ajv = new Ajv();
const validate = ajv.compile(schema);
let attempts = 0;
const maxAttempts = 3;
while (attempts < maxAttempts) {
attempts++;
console.log(`\nPlease provide the following information (attempt ${attempts}/${maxAttempts}):`);
const content: Record<string, unknown> = {};
let inputCancelled = false;
// Collect input for each field
for (const [fieldName, fieldSchema] of Object.entries(properties)) {
const field = fieldSchema as {
type?: string;
title?: string;
description?: string;
default?: unknown;
enum?: string[];
minimum?: number;
maximum?: number;
minLength?: number;
maxLength?: number;
format?: string;
};
const isRequired = required.includes(fieldName);
let prompt = `${field.title || fieldName}`;
// Add helpful information to the prompt
if (field.description) {
prompt += ` (${field.description})`;
}
if (field.enum) {
prompt += ` [options: ${field.enum.join(', ')}]`;
}
if (field.type === 'number' || field.type === 'integer') {
if (field.minimum !== undefined && field.maximum !== undefined) {
prompt += ` [${field.minimum}-${field.maximum}]`;
} else if (field.minimum !== undefined) {
prompt += ` [min: ${field.minimum}]`;
} else if (field.maximum !== undefined) {
prompt += ` [max: ${field.maximum}]`;
}
}
if (field.type === 'string' && field.format) {
prompt += ` [format: ${field.format}]`;
}
if (isRequired) {
prompt += ' *required*';
}
if (field.default !== undefined) {
prompt += ` [default: ${field.default}]`;
}
prompt += ': ';
const answer = await new Promise<string>((resolve) => {
readline.question(prompt, (input) => {
resolve(input.trim());
});
});
// Check for cancellation
if (answer.toLowerCase() === 'cancel' || answer.toLowerCase() === 'c') {
inputCancelled = true;
break;
}
// Parse and validate the input
try {
if (answer === '' && field.default !== undefined) {
content[fieldName] = field.default;
} else if (answer === '' && !isRequired) {
// Skip optional empty fields
continue;
} else if (answer === '') {
throw new Error(`${fieldName} is required`);
} else {
// Parse the value based on type
let parsedValue: unknown;
if (field.type === 'boolean') {
parsedValue = answer.toLowerCase() === 'true' || answer.toLowerCase() === 'yes' || answer === '1';
} else if (field.type === 'number') {
parsedValue = parseFloat(answer);
if (isNaN(parsedValue as number)) {
throw new Error(`${fieldName} must be a valid number`);
}
} else if (field.type === 'integer') {
parsedValue = parseInt(answer, 10);
if (isNaN(parsedValue as number)) {
throw new Error(`${fieldName} must be a valid integer`);
}
} else if (field.enum) {
if (!field.enum.includes(answer)) {
throw new Error(`${fieldName} must be one of: ${field.enum.join(', ')}`);
}
parsedValue = answer;
} else {
parsedValue = answer;
}
content[fieldName] = parsedValue;
}
} catch (error) {
console.log(`❌ Error: ${error}`);
// Continue to next attempt
break;
}
}
if (inputCancelled) {
return { action: 'cancel' };
}
// If we didn't complete all fields due to an error, try again
if (Object.keys(content).length !== Object.keys(properties).filter(name =>
required.includes(name) || content[name] !== undefined
).length) {
if (attempts < maxAttempts) {
console.log('Please try again...');
continue;
} else {
console.log('Maximum attempts reached. Declining request.');
return { action: 'decline' };
}
}
// Validate the complete object against the schema
const isValid = validate(content);
if (!isValid) {
console.log('❌ Validation errors:');
validate.errors?.forEach(error => {
console.log(` - ${error.dataPath || 'root'}: ${error.message}`);
});
if (attempts < maxAttempts) {
console.log('Please correct the errors and try again...');
continue;
} else {
console.log('Maximum attempts reached. Declining request.');
return { action: 'decline' };
}
}
// Show the collected data and ask for confirmation
console.log('\n✅ Collected data:');
console.log(JSON.stringify(content, null, 2));
const confirmAnswer = await new Promise<string>((resolve) => {
readline.question('\nSubmit this information? (yes/no/cancel): ', (input) => {
resolve(input.trim().toLowerCase());
});
});
if (confirmAnswer === 'yes' || confirmAnswer === 'y') {
return {
action: 'accept',
content,
};
} else if (confirmAnswer === 'cancel' || confirmAnswer === 'c') {
return { action: 'cancel' };
} else if (confirmAnswer === 'no' || confirmAnswer === 'n') {
if (attempts < maxAttempts) {
console.log('Please re-enter the information...');
continue;
} else {
return { action: 'decline' };
}
}
}
console.log('Maximum attempts reached. Declining request.');
return { action: 'decline' };
});
transport = new StreamableHTTPClientTransport(
new URL(serverUrl),
{
@ -358,7 +562,7 @@ async function callTool(name: string, args: Record<string, unknown>): Promise<vo
console.log('Tool result:');
const resourceLinks: ResourceLink[] = [];
result.content.forEach(item => {
if (item.type === 'text') {
console.log(` ${item.text}`);
@ -383,7 +587,7 @@ async function callTool(name: string, args: Record<string, unknown>): Promise<vo
console.log(` [Unknown content type]:`, item);
}
});
// Offer to read resource links
if (resourceLinks.length > 0) {
console.log(`\nFound ${resourceLinks.length} resource link(s). Use 'read-resource <uri>' to read their content.`);
@ -403,6 +607,11 @@ async function callMultiGreetTool(name: string): Promise<void> {
await callTool('multi-greet', { name });
}
async function callCollectInfoTool(infoType: string): Promise<void> {
console.log(`Testing elicitation with collect-user-info tool (${infoType})...`);
await callTool('collect-user-info', { infoType });
}
async function startNotifications(interval: number, count: number): Promise<void> {
console.log(`Starting notification stream: interval=${interval}ms, count=${count || 'unlimited'}`);
await callTool('start-notification-stream', { interval, count });
@ -546,7 +755,7 @@ async function readResource(uri: string): Promise<void> {
if (content.mimeType) {
console.log(` Type: ${content.mimeType}`);
}
if ('text' in content && typeof content.text === 'string') {
console.log(' Content:');
console.log(' ---');

View file

@ -5,7 +5,7 @@ import { McpServer } from '../../server/mcp.js';
import { StreamableHTTPServerTransport } from '../../server/streamableHttp.js';
import { getOAuthProtectedResourceMetadataUrl, mcpAuthMetadataRouter } from '../../server/auth/router.js';
import { requireBearerAuth } from '../../server/auth/middleware/bearerAuth.js';
import { CallToolResult, GetPromptResult, isInitializeRequest, ReadResourceResult, ResourceLink } from '../../types.js';
import { CallToolResult, GetPromptResult, isInitializeRequest, PrimitiveSchemaDefinition, ReadResourceResult, ResourceLink } from '../../types.js';
import { InMemoryEventStore } from '../shared/inMemoryEventStore.js';
import { setupAuthServer } from './demoInMemoryOAuthProvider.js';
import { OAuthMetadata } from 'src/shared/auth.js';
@ -86,6 +86,155 @@ const getServer = () => {
};
}
);
// Register a tool that demonstrates elicitation (user input collection)
// This creates a closure that captures the server instance
server.tool(
'collect-user-info',
'A tool that collects user information through elicitation',
{
infoType: z.enum(['contact', 'preferences', 'feedback']).describe('Type of information to collect'),
},
async ({ infoType }): Promise<CallToolResult> => {
let message: string;
let requestedSchema: {
type: 'object';
properties: Record<string, PrimitiveSchemaDefinition>;
required?: string[];
};
switch (infoType) {
case 'contact':
message = 'Please provide your contact information';
requestedSchema = {
type: 'object',
properties: {
name: {
type: 'string',
title: 'Full Name',
description: 'Your full name',
},
email: {
type: 'string',
title: 'Email Address',
description: 'Your email address',
format: 'email',
},
phone: {
type: 'string',
title: 'Phone Number',
description: 'Your phone number (optional)',
},
},
required: ['name', 'email'],
};
break;
case 'preferences':
message = 'Please set your preferences';
requestedSchema = {
type: 'object',
properties: {
theme: {
type: 'string',
title: 'Theme',
description: 'Choose your preferred theme',
enum: ['light', 'dark', 'auto'],
enumNames: ['Light', 'Dark', 'Auto'],
},
notifications: {
type: 'boolean',
title: 'Enable Notifications',
description: 'Would you like to receive notifications?',
default: true,
},
frequency: {
type: 'string',
title: 'Notification Frequency',
description: 'How often would you like notifications?',
enum: ['daily', 'weekly', 'monthly'],
enumNames: ['Daily', 'Weekly', 'Monthly'],
},
},
required: ['theme'],
};
break;
case 'feedback':
message = 'Please provide your feedback';
requestedSchema = {
type: 'object',
properties: {
rating: {
type: 'integer',
title: 'Rating',
description: 'Rate your experience (1-5)',
minimum: 1,
maximum: 5,
},
comments: {
type: 'string',
title: 'Comments',
description: 'Additional comments (optional)',
maxLength: 500,
},
recommend: {
type: 'boolean',
title: 'Would you recommend this?',
description: 'Would you recommend this to others?',
},
},
required: ['rating', 'recommend'],
};
break;
default:
throw new Error(`Unknown info type: ${infoType}`);
}
try {
// Use the underlying server instance to elicit input from the client
const result = await server.server.elicitInput({
message,
requestedSchema,
});
if (result.action === 'accept') {
return {
content: [
{
type: 'text',
text: `Thank you! Collected ${infoType} information: ${JSON.stringify(result.content, null, 2)}`,
},
],
};
} else if (result.action === 'decline') {
return {
content: [
{
type: 'text',
text: `No information was collected. User declined to provide ${infoType} information.`,
},
],
};
} else {
return {
content: [
{
type: 'text',
text: `Information collection was cancelled by the user.`,
},
],
};
}
} catch (error) {
return {
content: [
{
type: 'text',
text: `Error collecting ${infoType} information: ${error}`,
},
],
};
}
}
);
// Register a simple prompt with title
server.registerPrompt(
@ -178,10 +327,10 @@ const getServer = () => {
server.registerResource(
'example-file-1',
'file:///example/file1.txt',
{
{
title: 'Example File 1',
description: 'First example file for ResourceLink demonstration',
mimeType: 'text/plain'
mimeType: 'text/plain'
},
async (): Promise<ReadResourceResult> => {
return {
@ -198,10 +347,10 @@ const getServer = () => {
server.registerResource(
'example-file-2',
'file:///example/file2.txt',
{
{
title: 'Example File 2',
description: 'Second example file for ResourceLink demonstration',
mimeType: 'text/plain'
mimeType: 'text/plain'
},
async (): Promise<ReadResourceResult> => {
return {
@ -328,7 +477,7 @@ if (useOAuth) {
authMiddleware = requireBearerAuth({
verifier: tokenVerifier,
requiredScopes: ['mcp:tools'],
requiredScopes: [],
resourceMetadataUrl: getOAuthProtectedResourceMetadataUrl(mcpServerUrl),
});
}

View file

@ -5,7 +5,7 @@ import { Client } from '../client/index.js';
import { StreamableHTTPClientTransport } from '../client/streamableHttp.js';
import { McpServer } from '../server/mcp.js';
import { StreamableHTTPServerTransport } from '../server/streamableHttp.js';
import { CallToolResultSchema, ListToolsResultSchema, ListResourcesResultSchema, ListPromptsResultSchema, DEFAULT_NEGOTIATED_PROTOCOL_VERSION } from '../types.js';
import { CallToolResultSchema, ListToolsResultSchema, ListResourcesResultSchema, ListPromptsResultSchema, LATEST_PROTOCOL_VERSION } from '../types.js';
import { z } from 'zod';
describe('Streamable HTTP Transport Session Management', () => {
@ -145,7 +145,7 @@ describe('Streamable HTTP Transport Session Management', () => {
params: {}
}, ListToolsResultSchema);
});
it('should operate without session management', async () => {
// Create and connect a client
@ -220,15 +220,15 @@ describe('Streamable HTTP Transport Session Management', () => {
});
const transport = new StreamableHTTPClientTransport(baseUrl);
// Verify protocol version is not set before connecting
expect(transport.protocolVersion).toBeUndefined();
await client.connect(transport);
// Verify protocol version is set after connecting
expect(transport.protocolVersion).toBe(DEFAULT_NEGOTIATED_PROTOCOL_VERSION);
expect(transport.protocolVersion).toBe(LATEST_PROTOCOL_VERSION);
// Clean up
await transport.close();
});

View file

@ -15,6 +15,9 @@ export enum McpZodTypeKind {
export type CompleteCallback<T extends ZodTypeAny = ZodTypeAny> = (
value: T["_input"],
context?: {
arguments?: Record<string, string>;
},
) => T["_input"][] | Promise<T["_input"][]>;
export interface CompletableDef<T extends ZodTypeAny = ZodTypeAny>

View file

@ -10,6 +10,7 @@ import {
LATEST_PROTOCOL_VERSION,
SUPPORTED_PROTOCOL_VERSIONS,
CreateMessageRequestSchema,
ElicitRequestSchema,
ListPromptsRequestSchema,
ListResourcesRequestSchema,
ListToolsRequestSchema,
@ -267,6 +268,318 @@ test("should respect client capabilities", async () => {
await expect(server.listRoots()).rejects.toThrow(/^Client does not support/);
});
test("should respect client elicitation capabilities", async () => {
const server = new Server(
{
name: "test server",
version: "1.0",
},
{
capabilities: {
prompts: {},
resources: {},
tools: {},
logging: {},
},
enforceStrictCapabilities: true,
},
);
const client = new Client(
{
name: "test client",
version: "1.0",
},
{
capabilities: {
elicitation: {},
},
},
);
client.setRequestHandler(ElicitRequestSchema, (params) => ({
action: "accept",
content: {
username: params.params.message.includes("username") ? "test-user" : undefined,
confirmed: true,
},
}));
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
server.connect(serverTransport),
]);
expect(server.getClientCapabilities()).toEqual({ elicitation: {} });
// This should work because elicitation is supported by the client
await expect(
server.elicitInput({
message: "Please provide your username",
requestedSchema: {
type: "object",
properties: {
username: {
type: "string",
title: "Username",
description: "Your username",
},
confirmed: {
type: "boolean",
title: "Confirm",
description: "Please confirm",
default: false,
},
},
required: ["username"],
},
}),
).resolves.toEqual({
action: "accept",
content: {
username: "test-user",
confirmed: true,
},
});
// This should still throw because sampling is not supported by the client
await expect(
server.createMessage({
messages: [],
maxTokens: 10,
}),
).rejects.toThrow(/^Client does not support/);
});
test("should validate elicitation response against requested schema", async () => {
const server = new Server(
{
name: "test server",
version: "1.0",
},
{
capabilities: {
prompts: {},
resources: {},
tools: {},
logging: {},
},
enforceStrictCapabilities: true,
},
);
const client = new Client(
{
name: "test client",
version: "1.0",
},
{
capabilities: {
elicitation: {},
},
},
);
// Set up client to return valid response
client.setRequestHandler(ElicitRequestSchema, (request) => ({
action: "accept",
content: {
name: "John Doe",
email: "john@example.com",
age: 30,
},
}));
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
server.connect(serverTransport),
]);
// Test with valid response
await expect(
server.elicitInput({
message: "Please provide your information",
requestedSchema: {
type: "object",
properties: {
name: {
type: "string",
minLength: 1,
},
email: {
type: "string",
minLength: 1,
},
age: {
type: "integer",
minimum: 0,
maximum: 150,
},
},
required: ["name", "email"],
},
}),
).resolves.toEqual({
action: "accept",
content: {
name: "John Doe",
email: "john@example.com",
age: 30,
},
});
});
test("should reject elicitation response with invalid data", async () => {
const server = new Server(
{
name: "test server",
version: "1.0",
},
{
capabilities: {
prompts: {},
resources: {},
tools: {},
logging: {},
},
enforceStrictCapabilities: true,
},
);
const client = new Client(
{
name: "test client",
version: "1.0",
},
{
capabilities: {
elicitation: {},
},
},
);
// Set up client to return invalid response (missing required field, invalid age)
client.setRequestHandler(ElicitRequestSchema, (request) => ({
action: "accept",
content: {
email: "", // Invalid - too short
age: -5, // Invalid age
},
}));
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
server.connect(serverTransport),
]);
// Test with invalid response
await expect(
server.elicitInput({
message: "Please provide your information",
requestedSchema: {
type: "object",
properties: {
name: {
type: "string",
minLength: 1,
},
email: {
type: "string",
minLength: 1,
},
age: {
type: "integer",
minimum: 0,
maximum: 150,
},
},
required: ["name", "email"],
},
}),
).rejects.toThrow(/does not match requested schema/);
});
test("should allow elicitation decline and cancel without validation", async () => {
const server = new Server(
{
name: "test server",
version: "1.0",
},
{
capabilities: {
prompts: {},
resources: {},
tools: {},
logging: {},
},
enforceStrictCapabilities: true,
},
);
const client = new Client(
{
name: "test client",
version: "1.0",
},
{
capabilities: {
elicitation: {},
},
},
);
let requestCount = 0;
client.setRequestHandler(ElicitRequestSchema, (request) => {
requestCount++;
if (requestCount === 1) {
return { action: "decline" };
} else {
return { action: "cancel" };
}
});
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
server.connect(serverTransport),
]);
const schema = {
type: "object" as const,
properties: {
name: { type: "string" as const },
},
required: ["name"],
};
// Test decline - should not validate
await expect(
server.elicitInput({
message: "Please provide your name",
requestedSchema: schema,
}),
).resolves.toEqual({
action: "decline",
});
// Test cancel - should not validate
await expect(
server.elicitInput({
message: "Please provide your name",
requestedSchema: schema,
}),
).resolves.toEqual({
action: "cancel",
});
});
test("should respect server notification capabilities", async () => {
const server = new Server(
{

View file

@ -8,6 +8,9 @@ import {
ClientCapabilities,
CreateMessageRequest,
CreateMessageResultSchema,
ElicitRequest,
ElicitResult,
ElicitResultSchema,
EmptyResultSchema,
Implementation,
InitializedNotificationSchema,
@ -18,6 +21,8 @@ import {
ListRootsRequest,
ListRootsResultSchema,
LoggingMessageNotification,
McpError,
ErrorCode,
Notification,
Request,
ResourceUpdatedNotification,
@ -28,6 +33,7 @@ import {
ServerResult,
SUPPORTED_PROTOCOL_VERSIONS,
} from "../types.js";
import Ajv from "ajv";
export type ServerOptions = ProtocolOptions & {
/**
@ -129,6 +135,14 @@ export class Server<
}
break;
case "elicitation/create":
if (!this._clientCapabilities?.elicitation) {
throw new Error(
`Client does not support elicitation (required for ${method})`,
);
}
break;
case "roots/list":
if (!this._clientCapabilities?.roots) {
throw new Error(
@ -296,6 +310,44 @@ export class Server<
);
}
async elicitInput(
params: ElicitRequest["params"],
options?: RequestOptions,
): Promise<ElicitResult> {
const result = await this.request(
{ method: "elicitation/create", params },
ElicitResultSchema,
options,
);
// Validate the response content against the requested schema if action is "accept"
if (result.action === "accept" && result.content) {
try {
const ajv = new Ajv();
const validate = ajv.compile(params.requestedSchema);
const isValid = validate(result.content);
if (!isValid) {
throw new McpError(
ErrorCode.InvalidParams,
`Elicitation response content does not match requested schema: ${ajv.errorsText(validate.errors)}`,
);
}
} catch (error) {
if (error instanceof McpError) {
throw error;
}
throw new McpError(
ErrorCode.InternalError,
`Error validating elicitation response: ${error}`,
);
}
}
return result;
}
async listRoots(
params?: ListRootsRequest["params"],
options?: RequestOptions,

View file

@ -14,6 +14,7 @@ import {
LoggingMessageNotificationSchema,
Notification,
TextContent,
ElicitRequestSchema,
} from "../types.js";
import { ResourceTemplate } from "./mcp.js";
import { completable } from "./completable.js";
@ -3521,12 +3522,12 @@ describe("prompt()", () => {
);
expect(result.resources).toHaveLength(2);
// Resource 1 should have its own metadata
expect(result.resources[0].name).toBe("Resource 1");
expect(result.resources[0].description).toBe("Individual resource description");
expect(result.resources[0].mimeType).toBe("text/plain");
// Resource 2 should inherit template metadata
expect(result.resources[1].name).toBe("Resource 2");
expect(result.resources[1].description).toBe("Template description");
@ -3592,7 +3593,7 @@ describe("prompt()", () => {
);
expect(result.resources).toHaveLength(1);
// All fields should be from the individual resource, not the template
expect(result.resources[0].name).toBe("Overridden Name");
expect(result.resources[0].description).toBe("Overridden description");
@ -3698,41 +3699,532 @@ describe("Tool title precedence", () => {
});
test("getDisplayName unit tests for title precedence", () => {
// Test 1: Only name
expect(getDisplayName({ name: "tool_name" })).toBe("tool_name");
// Test 2: Name and title - title wins
expect(getDisplayName({
name: "tool_name",
title: "Tool Title"
expect(getDisplayName({
name: "tool_name",
title: "Tool Title"
})).toBe("Tool Title");
// Test 3: Name and annotations.title - annotations.title wins
expect(getDisplayName({
expect(getDisplayName({
name: "tool_name",
annotations: { title: "Annotations Title" }
})).toBe("Annotations Title");
// Test 4: All three - title wins (correct precedence)
expect(getDisplayName({
name: "tool_name",
expect(getDisplayName({
name: "tool_name",
title: "Regular Title",
annotations: { title: "Annotations Title" }
})).toBe("Regular Title");
// Test 5: Empty title should not be used
expect(getDisplayName({
name: "tool_name",
expect(getDisplayName({
name: "tool_name",
title: "",
annotations: { title: "Annotations Title" }
})).toBe("Annotations Title");
// Test 6: Undefined vs null handling
expect(getDisplayName({
name: "tool_name",
expect(getDisplayName({
name: "tool_name",
title: undefined,
annotations: { title: "Annotations Title" }
})).toBe("Annotations Title");
});
test("should support resource template completion with resolved context", async () => {
const mcpServer = new McpServer({
name: "test server",
version: "1.0",
});
const client = new Client({
name: "test client",
version: "1.0",
});
mcpServer.registerResource(
"test",
new ResourceTemplate("github://repos/{owner}/{repo}", {
list: undefined,
complete: {
repo: (value, context) => {
if (context?.arguments?.["owner"] === "org1") {
return ["project1", "project2", "project3"].filter(r => r.startsWith(value));
} else if (context?.arguments?.["owner"] === "org2") {
return ["repo1", "repo2", "repo3"].filter(r => r.startsWith(value));
}
return [];
},
},
}),
{
title: "GitHub Repository",
description: "Repository information"
},
async () => ({
contents: [
{
uri: "github://repos/test/test",
text: "Test content",
},
],
}),
);
const [clientTransport, serverTransport] =
InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
mcpServer.server.connect(serverTransport),
]);
// Test with microsoft owner
const result1 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/resource",
uri: "github://repos/{owner}/{repo}",
},
argument: {
name: "repo",
value: "p",
},
context: {
arguments: {
owner: "org1",
},
},
},
},
CompleteResultSchema,
);
expect(result1.completion.values).toEqual(["project1", "project2", "project3"]);
expect(result1.completion.total).toBe(3);
// Test with facebook owner
const result2 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/resource",
uri: "github://repos/{owner}/{repo}",
},
argument: {
name: "repo",
value: "r",
},
context: {
arguments: {
owner: "org2",
},
},
},
},
CompleteResultSchema,
);
expect(result2.completion.values).toEqual(["repo1", "repo2", "repo3"]);
expect(result2.completion.total).toBe(3);
// Test with no resolved context
const result3 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/resource",
uri: "github://repos/{owner}/{repo}",
},
argument: {
name: "repo",
value: "t",
},
},
},
CompleteResultSchema,
);
expect(result3.completion.values).toEqual([]);
expect(result3.completion.total).toBe(0);
});
test("should support prompt argument completion with resolved context", async () => {
const mcpServer = new McpServer({
name: "test server",
version: "1.0",
});
const client = new Client({
name: "test client",
version: "1.0",
});
mcpServer.registerPrompt(
"test-prompt",
{
title: "Team Greeting",
description: "Generate a greeting for team members",
argsSchema: {
department: completable(z.string(), (value) => {
return ["engineering", "sales", "marketing", "support"].filter(d => d.startsWith(value));
}),
name: completable(z.string(), (value, context) => {
const department = context?.arguments?.["department"];
if (department === "engineering") {
return ["Alice", "Bob", "Charlie"].filter(n => n.startsWith(value));
} else if (department === "sales") {
return ["David", "Eve", "Frank"].filter(n => n.startsWith(value));
} else if (department === "marketing") {
return ["Grace", "Henry", "Iris"].filter(n => n.startsWith(value));
}
return ["Guest"].filter(n => n.startsWith(value));
}),
}
},
async ({ department, name }) => ({
messages: [
{
role: "assistant",
content: {
type: "text",
text: `Hello ${name}, welcome to the ${department} team!`,
},
},
],
}),
);
const [clientTransport, serverTransport] =
InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
mcpServer.server.connect(serverTransport),
]);
// Test with engineering department
const result1 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/prompt",
name: "test-prompt",
},
argument: {
name: "name",
value: "A",
},
context: {
arguments: {
department: "engineering",
},
},
},
},
CompleteResultSchema,
);
expect(result1.completion.values).toEqual(["Alice"]);
// Test with sales department
const result2 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/prompt",
name: "test-prompt",
},
argument: {
name: "name",
value: "D",
},
context: {
arguments: {
department: "sales",
},
},
},
},
CompleteResultSchema,
);
expect(result2.completion.values).toEqual(["David"]);
// Test with marketing department
const result3 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/prompt",
name: "test-prompt",
},
argument: {
name: "name",
value: "G",
},
context: {
arguments: {
department: "marketing",
},
},
},
},
CompleteResultSchema,
);
expect(result3.completion.values).toEqual(["Grace"]);
// Test with no resolved context
const result4 = await client.request(
{
method: "completion/complete",
params: {
ref: {
type: "ref/prompt",
name: "test-prompt",
},
argument: {
name: "name",
value: "G",
},
},
},
CompleteResultSchema,
);
expect(result4.completion.values).toEqual(["Guest"]);
});
});
describe("elicitInput()", () => {
const checkAvailability = jest.fn().mockResolvedValue(false);
const findAlternatives = jest.fn().mockResolvedValue([]);
const makeBooking = jest.fn().mockResolvedValue("BOOKING-123");
let mcpServer: McpServer;
let client: Client;
beforeEach(() => {
jest.clearAllMocks();
// Create server with restaurant booking tool
mcpServer = new McpServer({
name: "restaurant-booking-server",
version: "1.0.0",
});
// Register the restaurant booking tool from README example
mcpServer.tool(
"book-restaurant",
{
restaurant: z.string(),
date: z.string(),
partySize: z.number()
},
async ({ restaurant, date, partySize }) => {
// Check availability
const available = await checkAvailability(restaurant, date, partySize);
if (!available) {
// Ask user if they want to try alternative dates
const result = await mcpServer.server.elicitInput({
message: `No tables available at ${restaurant} on ${date}. Would you like to check alternative dates?`,
requestedSchema: {
type: "object",
properties: {
checkAlternatives: {
type: "boolean",
title: "Check alternative dates",
description: "Would you like me to check other dates?"
},
flexibleDates: {
type: "string",
title: "Date flexibility",
description: "How flexible are your dates?",
enum: ["next_day", "same_week", "next_week"],
enumNames: ["Next day", "Same week", "Next week"]
}
},
required: ["checkAlternatives"]
}
});
if (result.action === "accept" && result.content?.checkAlternatives) {
const alternatives = await findAlternatives(
restaurant,
date,
partySize,
result.content.flexibleDates as string
);
return {
content: [{
type: "text",
text: `Found these alternatives: ${alternatives.join(", ")}`
}]
};
}
return {
content: [{
type: "text",
text: "No booking made. Original date not available."
}]
};
}
await makeBooking(restaurant, date, partySize);
return {
content: [{
type: "text",
text: `Booked table for ${partySize} at ${restaurant} on ${date}`
}]
};
}
);
// Create client with elicitation capability
client = new Client(
{
name: "test-client",
version: "1.0.0",
},
{
capabilities: {
elicitation: {},
},
}
);
});
test("should successfully elicit additional information", async () => {
// Mock availability check to return false
checkAvailability.mockResolvedValue(false);
findAlternatives.mockResolvedValue(["2024-12-26", "2024-12-27", "2024-12-28"]);
// Set up client to accept alternative date checking
client.setRequestHandler(ElicitRequestSchema, async (request) => {
expect(request.params.message).toContain("No tables available at ABC Restaurant on 2024-12-25");
return {
action: "accept",
content: {
checkAlternatives: true,
flexibleDates: "same_week"
}
};
});
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
mcpServer.server.connect(serverTransport),
]);
// Call the tool
const result = await client.callTool({
name: "book-restaurant",
arguments: {
restaurant: "ABC Restaurant",
date: "2024-12-25",
partySize: 2
}
});
expect(checkAvailability).toHaveBeenCalledWith("ABC Restaurant", "2024-12-25", 2);
expect(findAlternatives).toHaveBeenCalledWith("ABC Restaurant", "2024-12-25", 2, "same_week");
expect(result.content).toEqual([{
type: "text",
text: "Found these alternatives: 2024-12-26, 2024-12-27, 2024-12-28"
}]);
});
test("should handle user declining to elicitation request", async () => {
// Mock availability check to return false
checkAvailability.mockResolvedValue(false);
// Set up client to decline alternative date checking
client.setRequestHandler(ElicitRequestSchema, async () => {
return {
action: "accept",
content: {
checkAlternatives: false
}
};
});
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
mcpServer.server.connect(serverTransport),
]);
// Call the tool
const result = await client.callTool({
name: "book-restaurant",
arguments: {
restaurant: "ABC Restaurant",
date: "2024-12-25",
partySize: 2
}
});
expect(checkAvailability).toHaveBeenCalledWith("ABC Restaurant", "2024-12-25", 2);
expect(findAlternatives).not.toHaveBeenCalled();
expect(result.content).toEqual([{
type: "text",
text: "No booking made. Original date not available."
}]);
});
test("should handle user cancelling the elicitation", async () => {
// Mock availability check to return false
checkAvailability.mockResolvedValue(false);
// Set up client to cancel the elicitation
client.setRequestHandler(ElicitRequestSchema, async () => {
return {
action: "cancel"
};
});
const [clientTransport, serverTransport] = InMemoryTransport.createLinkedPair();
await Promise.all([
client.connect(clientTransport),
mcpServer.server.connect(serverTransport),
]);
// Call the tool
const result = await client.callTool({
name: "book-restaurant",
arguments: {
restaurant: "ABC Restaurant",
date: "2024-12-25",
partySize: 2
}
});
expect(checkAvailability).toHaveBeenCalledWith("ABC Restaurant", "2024-12-25", 2);
expect(findAlternatives).not.toHaveBeenCalled();
expect(result.content).toEqual([{
type: "text",
text: "No booking made. Original date not available."
}]);
});
});

View file

@ -293,7 +293,7 @@ export class McpServer {
}
const def: CompletableDef<ZodString> = field._def;
const suggestions = await def.complete(request.params.argument.value);
const suggestions = await def.complete(request.params.argument.value, request.params.context);
return createCompletionResult(suggestions);
}
@ -324,7 +324,7 @@ export class McpServer {
return EMPTY_COMPLETION_RESULT;
}
const suggestions = await completer(request.params.argument.value);
const suggestions = await completer(request.params.argument.value, request.params.context);
return createCompletionResult(suggestions);
}
@ -1068,6 +1068,9 @@ export class McpServer {
*/
export type CompleteResourceTemplateCallback = (
value: string,
context?: {
arguments?: Record<string, string>;
},
) => string[] | Promise<string[]>;
/**

View file

@ -15,7 +15,7 @@ export function getDisplayName(metadata: BaseMetadata): string {
if (metadata.title !== undefined && metadata.title !== '') {
return metadata.title;
}
// Then check for annotations.title (only present in Tool objects)
if ('annotations' in metadata) {
const metadataWithAnnotations = metadata as BaseMetadata & { annotations?: { title?: string } };
@ -23,14 +23,7 @@ export function getDisplayName(metadata: BaseMetadata): string {
return metadataWithAnnotations.annotations.title;
}
}
// Finally fall back to name
return metadata.name;
}
/**
* Checks if an object has a custom title different from its name.
*/
export function hasCustomTitle(metadata: BaseMetadata): boolean {
return metadata.title !== undefined && metadata.title !== metadata.name;
}

View file

@ -465,6 +465,7 @@ describe("mergeCapabilities", () => {
experimental: {
feature: true,
},
elicitation: {},
roots: {
newProp: true,
},
@ -473,6 +474,7 @@ describe("mergeCapabilities", () => {
const merged = mergeCapabilities(base, additional);
expect(merged).toEqual({
sampling: {},
elicitation: {},
roots: {
listChanged: true,
newProp: true,

View file

@ -4,14 +4,15 @@ import {
ResourceLinkSchema,
ContentBlockSchema,
PromptMessageSchema,
CallToolResultSchema
CallToolResultSchema,
CompleteRequestSchema
} from "./types.js";
describe("Types", () => {
test("should have correct latest protocol version", () => {
expect(LATEST_PROTOCOL_VERSION).toBeDefined();
expect(LATEST_PROTOCOL_VERSION).toBe("2025-03-26");
expect(LATEST_PROTOCOL_VERSION).toBe("2025-06-18");
});
test("should have correct supported protocol versions", () => {
expect(SUPPORTED_PROTOCOL_VERSIONS).toBeDefined();
@ -19,6 +20,7 @@ describe("Types", () => {
expect(SUPPORTED_PROTOCOL_VERSIONS).toContain(LATEST_PROTOCOL_VERSION);
expect(SUPPORTED_PROTOCOL_VERSIONS).toContain("2024-11-05");
expect(SUPPORTED_PROTOCOL_VERSIONS).toContain("2024-10-07");
expect(SUPPORTED_PROTOCOL_VERSIONS).toContain("2025-03-26");
});
describe("ResourceLink", () => {
@ -223,4 +225,91 @@ describe("Types", () => {
}
});
});
describe("CompleteRequest", () => {
test("should validate a CompleteRequest without resolved field", () => {
const request = {
method: "completion/complete",
params: {
ref: { type: "ref/prompt", name: "greeting" },
argument: { name: "name", value: "A" }
}
};
const result = CompleteRequestSchema.safeParse(request);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.method).toBe("completion/complete");
expect(result.data.params.ref.type).toBe("ref/prompt");
expect(result.data.params.context).toBeUndefined();
}
});
test("should validate a CompleteRequest with resolved field", () => {
const request = {
method: "completion/complete",
params: {
ref: { type: "ref/resource", uri: "github://repos/{owner}/{repo}" },
argument: { name: "repo", value: "t" },
context: {
arguments: {
"{owner}": "microsoft"
}
}
}
};
const result = CompleteRequestSchema.safeParse(request);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.params.context?.arguments).toEqual({
"{owner}": "microsoft"
});
}
});
test("should validate a CompleteRequest with empty resolved field", () => {
const request = {
method: "completion/complete",
params: {
ref: { type: "ref/prompt", name: "test" },
argument: { name: "arg", value: "" },
context: {
arguments: {}
}
}
};
const result = CompleteRequestSchema.safeParse(request);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.params.context?.arguments).toEqual({});
}
});
test("should validate a CompleteRequest with multiple resolved variables", () => {
const request = {
method: "completion/complete",
params: {
ref: { type: "ref/resource", uri: "api://v1/{tenant}/{resource}/{id}" },
argument: { name: "id", value: "123" },
context: {
arguments: {
"{tenant}": "acme-corp",
"{resource}": "users"
}
}
}
};
const result = CompleteRequestSchema.safeParse(request);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.params.context?.arguments).toEqual({
"{tenant}": "acme-corp",
"{resource}": "users"
});
}
});
});
});

View file

@ -1,9 +1,10 @@
import { z, ZodTypeAny } from "zod";
export const LATEST_PROTOCOL_VERSION = "2025-03-26";
export const LATEST_PROTOCOL_VERSION = "2025-06-18";
export const DEFAULT_NEGOTIATED_PROTOCOL_VERSION = "2025-03-26";
export const SUPPORTED_PROTOCOL_VERSIONS = [
LATEST_PROTOCOL_VERSION,
"2025-03-26",
"2024-11-05",
"2024-10-07",
];
@ -44,8 +45,9 @@ export const RequestSchema = z.object({
const BaseNotificationParamsSchema = z
.object({
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -58,8 +60,9 @@ export const NotificationSchema = z.object({
export const ResultSchema = z
.object({
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -236,6 +239,10 @@ export const ClientCapabilitiesSchema = z
* Present if the client supports sampling from an LLM.
*/
sampling: z.optional(z.object({}).passthrough()),
/**
* Present if the client supports eliciting user input.
*/
elicitation: z.optional(z.object({}).passthrough()),
/**
* Present if the client supports listing roots.
*/
@ -435,6 +442,11 @@ export const ResourceContentsSchema = z
* The MIME type of this resource, if known.
*/
mimeType: z.optional(z.string()),
/**
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -474,8 +486,9 @@ export const ResourceSchema = BaseMetadataSchema.extend({
mimeType: z.optional(z.string()),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
});
@ -501,8 +514,9 @@ export const ResourceTemplateSchema = BaseMetadataSchema.extend({
mimeType: z.optional(z.string()),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
});
@ -637,6 +651,11 @@ export const PromptSchema = BaseMetadataSchema.extend({
* A list of arguments to use for templating the prompt.
*/
arguments: z.optional(z.array(PromptArgumentSchema)),
/**
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
});
/**
@ -682,8 +701,9 @@ export const TextContentSchema = z
text: z.string(),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -704,8 +724,9 @@ export const ImageContentSchema = z
mimeType: z.string(),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -726,8 +747,9 @@ export const AudioContentSchema = z
mimeType: z.string(),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -739,6 +761,11 @@ export const EmbeddedResourceSchema = z
.object({
type: z.literal("resource"),
resource: z.union([TextResourceContentsSchema, BlobResourceContentsSchema]),
/**
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -883,8 +910,9 @@ export const ToolSchema = BaseMetadataSchema.extend({
annotations: z.optional(ToolAnnotationsSchema),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
});
@ -1115,6 +1143,107 @@ export const CreateMessageResultSchema = ResultSchema.extend({
]),
});
/* Elicitation */
/**
* Primitive schema definition for boolean fields.
*/
export const BooleanSchemaSchema = z
.object({
type: z.literal("boolean"),
title: z.optional(z.string()),
description: z.optional(z.string()),
default: z.optional(z.boolean()),
})
.passthrough();
/**
* Primitive schema definition for string fields.
*/
export const StringSchemaSchema = z
.object({
type: z.literal("string"),
title: z.optional(z.string()),
description: z.optional(z.string()),
minLength: z.optional(z.number()),
maxLength: z.optional(z.number()),
format: z.optional(z.enum(["email", "uri", "date", "date-time"])),
})
.passthrough();
/**
* Primitive schema definition for number fields.
*/
export const NumberSchemaSchema = z
.object({
type: z.enum(["number", "integer"]),
title: z.optional(z.string()),
description: z.optional(z.string()),
minimum: z.optional(z.number()),
maximum: z.optional(z.number()),
})
.passthrough();
/**
* Primitive schema definition for enum fields.
*/
export const EnumSchemaSchema = z
.object({
type: z.literal("string"),
title: z.optional(z.string()),
description: z.optional(z.string()),
enum: z.array(z.string()),
enumNames: z.optional(z.array(z.string())),
})
.passthrough();
/**
* Union of all primitive schema definitions.
*/
export const PrimitiveSchemaDefinitionSchema = z.union([
BooleanSchemaSchema,
StringSchemaSchema,
NumberSchemaSchema,
EnumSchemaSchema,
]);
/**
* A request from the server to elicit user input via the client.
* The client should present the message and form fields to the user.
*/
export const ElicitRequestSchema = RequestSchema.extend({
method: z.literal("elicitation/create"),
params: BaseRequestParamsSchema.extend({
/**
* The message to present to the user.
*/
message: z.string(),
/**
* The schema for the requested user input.
*/
requestedSchema: z
.object({
type: z.literal("object"),
properties: z.record(z.string(), PrimitiveSchemaDefinitionSchema),
required: z.optional(z.array(z.string())),
})
.passthrough(),
}),
});
/**
* The client's response to an elicitation/create request from the server.
*/
export const ElicitResultSchema = ResultSchema.extend({
/**
* The user's response action.
*/
action: z.enum(["accept", "decline", "cancel"]),
/**
* The collected user input content (only present if action is "accept").
*/
content: z.optional(z.record(z.string(), z.unknown())),
});
/* Autocomplete */
/**
* A reference to a resource or resource template definition.
@ -1169,6 +1298,14 @@ export const CompleteRequestSchema = RequestSchema.extend({
value: z.string(),
})
.passthrough(),
context: z.optional(
z.object({
/**
* Previously-resolved variables in a URI template or prompt.
*/
arguments: z.optional(z.record(z.string(), z.string())),
})
),
}),
});
@ -1210,8 +1347,9 @@ export const RootSchema = z
name: z.optional(z.string()),
/**
* Reserved by MCP for protocol-level metadata; implementations must not make assumptions about its contents.
*/
* See [MCP specification](https://github.com/modelcontextprotocol/modelcontextprotocol/blob/47339c03c143bb4ec01a26e721a1b8fe66634ebe/docs/specification/draft/basic/index.mdx#general-fields)
* for notes on _meta usage.
*/
_meta: z.optional(z.object({}).passthrough()),
})
.passthrough();
@ -1264,6 +1402,7 @@ export const ClientNotificationSchema = z.union([
export const ClientResultSchema = z.union([
EmptyResultSchema,
CreateMessageResultSchema,
ElicitResultSchema,
ListRootsResultSchema,
]);
@ -1271,6 +1410,7 @@ export const ClientResultSchema = z.union([
export const ServerRequestSchema = z.union([
PingRequestSchema,
CreateMessageRequestSchema,
ElicitRequestSchema,
ListRootsRequestSchema,
]);
@ -1418,6 +1558,15 @@ export type SamplingMessage = Infer<typeof SamplingMessageSchema>;
export type CreateMessageRequest = Infer<typeof CreateMessageRequestSchema>;
export type CreateMessageResult = Infer<typeof CreateMessageResultSchema>;
/* Elicitation */
export type BooleanSchema = Infer<typeof BooleanSchemaSchema>;
export type StringSchema = Infer<typeof StringSchemaSchema>;
export type NumberSchema = Infer<typeof NumberSchemaSchema>;
export type EnumSchema = Infer<typeof EnumSchemaSchema>;
export type PrimitiveSchemaDefinition = Infer<typeof PrimitiveSchemaDefinitionSchema>;
export type ElicitRequest = Infer<typeof ElicitRequestSchema>;
export type ElicitResult = Infer<typeof ElicitResultSchema>;
/* Autocomplete */
export type ResourceTemplateReference = Infer<typeof ResourceTemplateReferenceSchema>;
/**