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rename: sdk-client->client, sdk-server->server, sdk-core->core, sdk-examples-client->examples-client, sdk-examples-server->examples-server, sdk-examples-shared->examples-shared
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‎.changeset/config.json‎

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"access": "public",
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"baseBranch": "main",
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"updateInternalDependencies": "patch",
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"ignore": [
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"@modelcontextprotocol/sdk-examples-client",
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"@modelcontextprotocol/sdk-examples-server",
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"@modelcontextprotocol/sdk-examples-shared"
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]
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"ignore": ["@modelcontextprotocol/examples-client", "@modelcontextprotocol/examples-server", "@modelcontextprotocol/examples-shared"]
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}

‎.changeset/tender-snails-fold.md‎

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---
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'@modelcontextprotocol/sdk-client': patch
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'@modelcontextprotocol/sdk-server': patch
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'@modelcontextprotocol/client': patch
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'@modelcontextprotocol/server': patch
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---
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Initial 2.0.0-alpha.0 client and server package

‎CLAUDE.md‎

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# Run a single package script (examples)
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# Run a single package script from the repo root with pnpm filter
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pnpm --filter @modelcontextprotocol/sdk-core test # vitest run (core)
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pnpm --filter @modelcontextprotocol/sdk-core test:watch # vitest (watch)
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pnpm --filter @modelcontextprotocol/sdk-core test -- path/to/file.test.ts
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pnpm --filter @modelcontextprotocol/sdk-core test -- -t "test name"
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pnpm --filter @modelcontextprotocol/core test # vitest run (core)
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pnpm --filter @modelcontextprotocol/core test:watch # vitest (watch)
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pnpm --filter @modelcontextprotocol/core test -- path/to/file.test.ts
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pnpm --filter @modelcontextprotocol/core test -- -t "test name"
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```
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## Code Style Guidelines

‎README.md‎

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This monorepo publishes split packages:
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- **`@modelcontextprotocol/sdk-server`**: build MCP servers
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- **`@modelcontextprotocol/sdk-client`**: build MCP clients
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- **`@modelcontextprotocol/server`**: build MCP servers
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- **`@modelcontextprotocol/client`**: build MCP clients
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Both packages have a **required peer dependency** on `zod` for schema validation. The SDK internally imports from `zod/v4`, but remains compatible with projects using Zod v3.25+.
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### Server
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```bash
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npm install @modelcontextprotocol/sdk-server zod
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npm install @modelcontextprotocol/server zod
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```
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### Client
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```bash
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npm install @modelcontextprotocol/sdk-client zod
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npm install @modelcontextprotocol/client zod
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```
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## Quick Start (runnable examples)
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2. **Run a Streamable HTTP example server**:
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```bash
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pnpm --filter @modelcontextprotocol/sdk-examples-server exec tsx src/simpleStreamableHttp.ts
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pnpm --filter @modelcontextprotocol/examples-server exec tsx src/simpleStreamableHttp.ts
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```
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Alternatively, from within the example package:
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3. **Run the interactive client in another terminal**:
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```bash
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pnpm --filter @modelcontextprotocol/sdk-examples-client exec tsx src/simpleStreamableHttp.ts
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pnpm --filter @modelcontextprotocol/examples-client exec tsx src/simpleStreamableHttp.ts
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```
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Alternatively, from within the example package:

‎docs/faq.md‎

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### Why do I see `TS2589: Type instantiation is excessively deep and possibly infinite` after upgrading the SDK?
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This TypeScript error can appear when upgrading to newer SDK versions that support Zod v4 (for example, from older `@modelcontextprotocol/sdk` releases to newer `@modelcontextprotocol/sdk-client` / `@modelcontextprotocol/sdk-server` releases) **and** your project ends up with
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multiple `zod` versions in the dependency tree.
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This TypeScript error can appear when upgrading to newer SDK versions that support Zod v4 (for example, from older `@modelcontextprotocol/sdk` releases to newer `@modelcontextprotocol/client` / `@modelcontextprotocol/server` releases) **and** your project ends up with multiple
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`zod` versions in the dependency tree.
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When there are multiple copies or versions of `zod`, TypeScript may try to instantiate very complex, cross-version types and hit its recursion limits, resulting in `TS2589`. This scenario is discussed in GitHub issue
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[#1180](https://github.com/modelcontextprotocol/typescript-sdk/issues/1180#event-21236550401).

‎docs/server.md‎

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## Server overview
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This SDK lets you build MCP servers in TypeScript and connect them to different transports. For most use cases you will use `McpServer` from `@modelcontextprotocol/sdk-server` and choose one of:
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This SDK lets you build MCP servers in TypeScript and connect them to different transports. For most use cases you will use `McpServer` from `@modelcontextprotocol/server` and choose one of:
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- **Streamable HTTP** (recommended for remote servers)
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- **HTTP + SSE** (deprecated, for backwards compatibility only)
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MCP servers running on localhost are vulnerable to DNS rebinding attacks. Use `createMcpExpressApp()` to create an Express app with DNS rebinding protection enabled by default:
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```typescript
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import { createMcpExpressApp } from '@modelcontextprotocol/sdk-server';
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import { createMcpExpressApp } from '@modelcontextprotocol/server';
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// Protection auto-enabled (default host is 127.0.0.1)
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const app = createMcpExpressApp();
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```typescript
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import { createMcpExpressApp } from '@modelcontextprotocol/sdk-server';
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import { createMcpExpressApp } from '@modelcontextprotocol/server';
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const app = createMcpExpressApp({
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Tools, resources and prompts support a `title` field for human‑readable names. Older APIs can also attach `annotations.title`. To compute the correct display name on the client, use:
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- `getDisplayName` from `@modelcontextprotocol/sdk-client`
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- `getDisplayName` from `@modelcontextprotocol/client`
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## Multi‑node deployment patterns
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‎examples/client/README.md‎

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# MCP TypeScript SDK Examples (Client)
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This directory contains runnable MCP **client** examples built with `@modelcontextprotocol/sdk-client`.
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This directory contains runnable MCP **client** examples built with `@modelcontextprotocol/client`.
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For server examples, see [`../server/README.md`](../server/README.md). For guided docs, see [`../../docs/client.md`](../../docs/client.md).
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```bash
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pnpm --filter @modelcontextprotocol/examples-client exec tsx src/simpleStreamableHttp.ts
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```bash
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pnpm --filter @modelcontextprotocol/examples-server exec tsx src/elicitationUrlExample.ts
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```
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Then run the client:
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pnpm --filter @modelcontextprotocol/examples-client exec tsx src/elicitationUrlExample.ts
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```

‎examples/client/package.json‎

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{
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"name": "@modelcontextprotocol/sdk-examples-client",
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"name": "@modelcontextprotocol/examples-client",
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"private": true,
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"version": "2.0.0-alpha.0",
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"description": "Model Context Protocol implementation for TypeScript",
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},
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"dependencies": {
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"@modelcontextprotocol/sdk-client": "workspace:^",
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"@modelcontextprotocol/client": "workspace:^",
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"@modelcontextprotocol/examples-shared": "workspace:^",
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‎examples/client/src/elicitationUrlExample.ts‎

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} from '@modelcontextprotocol/client';
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} from '@modelcontextprotocol/client';
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import { InMemoryOAuthClientProvider } from './simpleOAuthClientProvider.js';
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‎examples/client/src/multipleClientsParallel.ts‎

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import type { CallToolRequest, CallToolResult } from '@modelcontextprotocol/sdk-client';
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import type { CallToolRequest, CallToolResult } from '@modelcontextprotocol/client';
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Client,
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/**
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* Multiple Clients MCP Example

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