v2: Errors refactor (ProtocolError, SdkError, OAuthError) (#1454)
This commit is contained in:
Konstantin Konstantinov
GitHub
parent
160902eb2e
commit
0f0a4eb7c8
1 changed files with 1086 additions and 705 deletions
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@ -20,13 +20,13 @@ Remove the old package and install only what you need:
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npm uninstall @modelcontextprotocol/sdk
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```
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| You need | Install |
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|----------|---------|
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| Client only | `npm install @modelcontextprotocol/client` |
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| Server only | `npm install @modelcontextprotocol/server` |
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| Server + Node.js HTTP | `npm install @modelcontextprotocol/server @modelcontextprotocol/node` |
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| Server + Express | `npm install @modelcontextprotocol/server @modelcontextprotocol/express` |
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| Server + Hono | `npm install @modelcontextprotocol/server @modelcontextprotocol/hono` |
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| You need | Install |
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| --------------------- | ------------------------------------------------------------------------ |
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| Client only | `npm install @modelcontextprotocol/client` |
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| Server only | `npm install @modelcontextprotocol/server` |
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| Server + Node.js HTTP | `npm install @modelcontextprotocol/server @modelcontextprotocol/node` |
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| Server + Express | `npm install @modelcontextprotocol/server @modelcontextprotocol/express` |
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| Server + Hono | `npm install @modelcontextprotocol/server @modelcontextprotocol/hono` |
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`@modelcontextprotocol/core` is installed automatically as a dependency.
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@ -36,65 +36,175 @@ Replace all `@modelcontextprotocol/sdk/...` imports using this table.
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### Client imports
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| v1 import path | v2 package |
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|----------------|------------|
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| `@modelcontextprotocol/sdk/client/index.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/auth.js` | `@modelcontextprotocol/client` |
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| v1 import path | v2 package |
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| ---------------------------------------------------- | ------------------------------ |
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| `@modelcontextprotocol/sdk/client/index.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/auth.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/streamableHttp.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/sse.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/stdio.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/websocket.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/sse.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/stdio.js` | `@modelcontextprotocol/client` |
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| `@modelcontextprotocol/sdk/client/websocket.js` | `@modelcontextprotocol/client` |
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### Server imports
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| v1 import path | v2 package |
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|----------------|------------|
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| `@modelcontextprotocol/sdk/server/mcp.js` | `@modelcontextprotocol/server` |
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| `@modelcontextprotocol/sdk/server/index.js` | `@modelcontextprotocol/server` |
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| `@modelcontextprotocol/sdk/server/stdio.js` | `@modelcontextprotocol/server` |
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| v1 import path | v2 package |
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| ---------------------------------------------------- | ----------------------------------------------------------------------------------- |
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| `@modelcontextprotocol/sdk/server/mcp.js` | `@modelcontextprotocol/server` |
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| `@modelcontextprotocol/sdk/server/index.js` | `@modelcontextprotocol/server` |
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| `@modelcontextprotocol/sdk/server/stdio.js` | `@modelcontextprotocol/server` |
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| `@modelcontextprotocol/sdk/server/streamableHttp.js` | `@modelcontextprotocol/node` (class renamed to `NodeStreamableHTTPServerTransport`) |
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| `@modelcontextprotocol/sdk/server/sse.js` | REMOVED (migrate to Streamable HTTP) |
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| `@modelcontextprotocol/sdk/server/auth/*` | REMOVED (use external auth library) |
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| `@modelcontextprotocol/sdk/server/middleware.js` | `@modelcontextprotocol/express` (signature changed, see section 8) |
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| `@modelcontextprotocol/sdk/server/sse.js` | REMOVED (migrate to Streamable HTTP) |
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| `@modelcontextprotocol/sdk/server/auth/*` | REMOVED (use external auth library) |
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| `@modelcontextprotocol/sdk/server/middleware.js` | `@modelcontextprotocol/express` (signature changed, see section 8) |
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### Types / shared imports
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| v1 import path | v2 package |
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|----------------|------------|
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| `@modelcontextprotocol/sdk/types.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/protocol.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/transport.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/stdio.js` | `@modelcontextprotocol/core` |
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| v1 import path | v2 package |
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| ------------------------------------------------- | ---------------------------- |
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| `@modelcontextprotocol/sdk/types.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/protocol.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/transport.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/stdio.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/uriTemplate.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/auth.js` | `@modelcontextprotocol/core` |
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| `@modelcontextprotocol/sdk/shared/auth.js` | `@modelcontextprotocol/core` |
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Notes:
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- `@modelcontextprotocol/client` and `@modelcontextprotocol/server` both re-export everything from `@modelcontextprotocol/core`, so you can import types from whichever package you already depend on.
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- When multiple v1 imports map to the same v2 package, consolidate them into a single import statement.
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- If code imports from `sdk/client/...`, install `@modelcontextprotocol/client`. If from `sdk/server/...`, install `@modelcontextprotocol/server`. If from `sdk/types.js` or `sdk/shared/...` only, install `@modelcontextprotocol/core`.
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## 4. Renamed Symbols
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| v1 symbol | v2 symbol | v2 package |
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|-----------|-----------|------------|
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| v1 symbol | v2 symbol | v2 package |
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| ------------------------------- | ----------------------------------- | ---------------------------- |
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| `StreamableHTTPServerTransport` | `NodeStreamableHTTPServerTransport` | `@modelcontextprotocol/node` |
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## 5. Removed / Renamed Type Aliases and Symbols
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| v1 (removed) | v2 (replacement) |
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|--------------|------------------|
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| `JSONRPCError` | `JSONRPCErrorResponse` |
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| `JSONRPCErrorSchema` | `JSONRPCErrorResponseSchema` |
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| `isJSONRPCError` | `isJSONRPCErrorResponse` |
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| `isJSONRPCResponse` | `isJSONRPCResultResponse` |
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| `ResourceReference` | `ResourceTemplateReference` |
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| `ResourceReferenceSchema` | `ResourceTemplateReferenceSchema` |
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| `IsomorphicHeaders` | REMOVED (use Web Standard `Headers`) |
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| `AuthInfo` (from `server/auth/types.js`) | `AuthInfo` (now in `@modelcontextprotocol/core`) |
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| v1 (removed) | v2 (replacement) |
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| ---------------------------------------- | -------------------------------------------------------- |
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| `JSONRPCError` | `JSONRPCErrorResponse` |
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| `JSONRPCErrorSchema` | `JSONRPCErrorResponseSchema` |
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| `isJSONRPCError` | `isJSONRPCErrorResponse` |
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| `isJSONRPCResponse` | `isJSONRPCResultResponse` |
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| `ResourceReference` | `ResourceTemplateReference` |
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| `ResourceReferenceSchema` | `ResourceTemplateReferenceSchema` |
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| `IsomorphicHeaders` | REMOVED (use Web Standard `Headers`) |
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| `AuthInfo` (from `server/auth/types.js`) | `AuthInfo` (now in `@modelcontextprotocol/core`) |
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| `McpError` | `ProtocolError` |
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| `ErrorCode` | `ProtocolErrorCode` |
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| `ErrorCode.RequestTimeout` | `SdkErrorCode.RequestTimeout` |
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| `ErrorCode.ConnectionClosed` | `SdkErrorCode.ConnectionClosed` |
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| `StreamableHTTPError` | REMOVED (use `SdkError` with `SdkErrorCode.ClientHttp*`) |
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All other symbols from `@modelcontextprotocol/sdk/types.js` retain their original names (e.g., `CallToolResultSchema`, `ListToolsResultSchema`, etc.).
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**Unchanged APIs** (only import paths changed): `Client` constructor and methods, `McpServer` constructor, `server.connect()`, `server.close()`, all client transports (`StreamableHTTPClientTransport`, `SSEClientTransport`, `StdioClientTransport`), `StdioServerTransport`, all Zod schemas, all callback return types.
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### Error class changes
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Two error classes now exist:
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- **`ProtocolError`** (renamed from `McpError`): Protocol errors that cross the wire as JSON-RPC responses
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- **`SdkError`** (new): Local SDK errors that never cross the wire
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| Error scenario | v1 type | v2 type |
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| -------------------------------- | -------------------------------------------- | ----------------------------------------------------------------- |
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| Request timeout | `McpError` with `ErrorCode.RequestTimeout` | `SdkError` with `SdkErrorCode.RequestTimeout` |
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| Connection closed | `McpError` with `ErrorCode.ConnectionClosed` | `SdkError` with `SdkErrorCode.ConnectionClosed` |
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| Capability not supported | `new Error(...)` | `SdkError` with `SdkErrorCode.CapabilityNotSupported` |
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| Not connected | `new Error('Not connected')` | `SdkError` with `SdkErrorCode.NotConnected` |
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| Invalid params (server response) | `McpError` with `ErrorCode.InvalidParams` | `ProtocolError` with `ProtocolErrorCode.InvalidParams` |
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| HTTP transport error | `StreamableHTTPError` | `SdkError` with `SdkErrorCode.ClientHttp*` |
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| Failed to open SSE stream | `StreamableHTTPError` | `SdkError` with `SdkErrorCode.ClientHttpFailedToOpenStream` |
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| 401 after auth flow | `StreamableHTTPError` | `SdkError` with `SdkErrorCode.ClientHttpAuthentication` |
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| 403 after upscoping | `StreamableHTTPError` | `SdkError` with `SdkErrorCode.ClientHttpForbidden` |
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| Unexpected content type | `StreamableHTTPError` | `SdkError` with `SdkErrorCode.ClientHttpUnexpectedContent` |
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| Session termination failed | `StreamableHTTPError` | `SdkError` with `SdkErrorCode.ClientHttpFailedToTerminateSession` |
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New `SdkErrorCode` enum values:
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- `SdkErrorCode.NotConnected` = `'NOT_CONNECTED'`
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- `SdkErrorCode.AlreadyConnected` = `'ALREADY_CONNECTED'`
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- `SdkErrorCode.NotInitialized` = `'NOT_INITIALIZED'`
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- `SdkErrorCode.CapabilityNotSupported` = `'CAPABILITY_NOT_SUPPORTED'`
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- `SdkErrorCode.RequestTimeout` = `'REQUEST_TIMEOUT'`
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- `SdkErrorCode.ConnectionClosed` = `'CONNECTION_CLOSED'`
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- `SdkErrorCode.SendFailed` = `'SEND_FAILED'`
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- `SdkErrorCode.ClientHttpNotImplemented` = `'CLIENT_HTTP_NOT_IMPLEMENTED'`
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- `SdkErrorCode.ClientHttpAuthentication` = `'CLIENT_HTTP_AUTHENTICATION'`
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- `SdkErrorCode.ClientHttpForbidden` = `'CLIENT_HTTP_FORBIDDEN'`
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- `SdkErrorCode.ClientHttpUnexpectedContent` = `'CLIENT_HTTP_UNEXPECTED_CONTENT'`
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- `SdkErrorCode.ClientHttpFailedToOpenStream` = `'CLIENT_HTTP_FAILED_TO_OPEN_STREAM'`
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- `SdkErrorCode.ClientHttpFailedToTerminateSession` = `'CLIENT_HTTP_FAILED_TO_TERMINATE_SESSION'`
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Update error handling:
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```typescript
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// v1
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if (error instanceof McpError && error.code === ErrorCode.RequestTimeout) { ... }
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// v2
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import { SdkError, SdkErrorCode } from '@modelcontextprotocol/core';
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if (error instanceof SdkError && error.code === SdkErrorCode.RequestTimeout) { ... }
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```
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Update HTTP transport error handling:
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```typescript
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// v1
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import { StreamableHTTPError } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
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if (error instanceof StreamableHTTPError) {
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console.log('HTTP status:', error.code);
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}
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// v2
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import { SdkError, SdkErrorCode } from '@modelcontextprotocol/core';
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if (error instanceof SdkError && error.code === SdkErrorCode.ClientHttpFailedToOpenStream) {
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const status = (error.data as { status?: number })?.status;
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}
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```
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### OAuth error consolidation
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Individual OAuth error classes replaced with single `OAuthError` class and `OAuthErrorCode` enum:
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| v1 Class | v2 Equivalent |
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| ------------------------------ | ---------------------------------------------------------- |
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| `InvalidRequestError` | `OAuthError` with `OAuthErrorCode.InvalidRequest` |
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| `InvalidClientError` | `OAuthError` with `OAuthErrorCode.InvalidClient` |
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| `InvalidGrantError` | `OAuthError` with `OAuthErrorCode.InvalidGrant` |
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| `UnauthorizedClientError` | `OAuthError` with `OAuthErrorCode.UnauthorizedClient` |
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| `UnsupportedGrantTypeError` | `OAuthError` with `OAuthErrorCode.UnsupportedGrantType` |
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| `InvalidScopeError` | `OAuthError` with `OAuthErrorCode.InvalidScope` |
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| `AccessDeniedError` | `OAuthError` with `OAuthErrorCode.AccessDenied` |
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| `ServerError` | `OAuthError` with `OAuthErrorCode.ServerError` |
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| `TemporarilyUnavailableError` | `OAuthError` with `OAuthErrorCode.TemporarilyUnavailable` |
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| `UnsupportedResponseTypeError` | `OAuthError` with `OAuthErrorCode.UnsupportedResponseType` |
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| `UnsupportedTokenTypeError` | `OAuthError` with `OAuthErrorCode.UnsupportedTokenType` |
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| `InvalidTokenError` | `OAuthError` with `OAuthErrorCode.InvalidToken` |
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| `MethodNotAllowedError` | `OAuthError` with `OAuthErrorCode.MethodNotAllowed` |
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| `TooManyRequestsError` | `OAuthError` with `OAuthErrorCode.TooManyRequests` |
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| `InvalidClientMetadataError` | `OAuthError` with `OAuthErrorCode.InvalidClientMetadata` |
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| `InsufficientScopeError` | `OAuthError` with `OAuthErrorCode.InsufficientScope` |
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| `InvalidTargetError` | `OAuthError` with `OAuthErrorCode.InvalidTarget` |
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| `CustomOAuthError` | `new OAuthError(customCode, message)` |
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Removed: `OAUTH_ERRORS` constant.
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Update OAuth error handling:
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```typescript
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// v1
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import { InvalidClientError, InvalidGrantError } from '@modelcontextprotocol/core';
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if (error instanceof InvalidClientError) { ... }
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// v2
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import { OAuthError, OAuthErrorCode } from '@modelcontextprotocol/core';
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if (error instanceof OAuthError && error.code === OAuthErrorCode.InvalidClient) { ... }
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```
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**Unchanged APIs** (only import paths changed): `Client` constructor and methods, `McpServer` constructor, `server.connect()`, `server.close()`, all client transports (`StreamableHTTPClientTransport`, `SSEClientTransport`, `StdioClientTransport`), `StdioServerTransport`, all Zod
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schemas, all callback return types.
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## 6. McpServer API Changes
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@ -105,21 +215,25 @@ The variadic `.tool()`, `.prompt()`, `.resource()` methods are removed. Use the
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```typescript
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// v1: server.tool(name, schema, callback)
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server.tool('greet', { name: z.string() }, async ({ name }) => {
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return { content: [{ type: 'text', text: `Hello, ${name}!` }] };
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return { content: [{ type: 'text', text: `Hello, ${name}!` }] };
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});
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// v1: server.tool(name, description, schema, callback)
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server.tool('greet', 'Greet a user', { name: z.string() }, async ({ name }) => {
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return { content: [{ type: 'text', text: `Hello, ${name}!` }] };
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return { content: [{ type: 'text', text: `Hello, ${name}!` }] };
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});
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// v2: server.registerTool(name, config, callback)
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server.registerTool('greet', {
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description: 'Greet a user',
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inputSchema: { name: z.string() },
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}, async ({ name }) => {
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return { content: [{ type: 'text', text: `Hello, ${name}!` }] };
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});
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server.registerTool(
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'greet',
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{
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description: 'Greet a user',
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inputSchema: { name: z.string() }
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},
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async ({ name }) => {
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return { content: [{ type: 'text', text: `Hello, ${name}!` }] };
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}
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);
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```
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Config object fields: `title?`, `description?`, `inputSchema?`, `outputSchema?`, `annotations?`, `_meta?`
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@ -129,15 +243,19 @@ Config object fields: `title?`, `description?`, `inputSchema?`, `outputSchema?`,
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```typescript
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// v1: server.prompt(name, schema, callback)
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server.prompt('summarize', { text: z.string() }, async ({ text }) => {
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return { messages: [{ role: 'user', content: { type: 'text', text } }] };
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return { messages: [{ role: 'user', content: { type: 'text', text } }] };
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});
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// v2: server.registerPrompt(name, config, callback)
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server.registerPrompt('summarize', {
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argsSchema: { text: z.string() },
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}, async ({ text }) => {
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return { messages: [{ role: 'user', content: { type: 'text', text } }] };
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});
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server.registerPrompt(
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'summarize',
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{
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argsSchema: { text: z.string() }
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},
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async ({ text }) => {
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return { messages: [{ role: 'user', content: { type: 'text', text } }] };
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}
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);
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```
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Config object fields: `title?`, `description?`, `argsSchema?`
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@ -146,13 +264,13 @@ Config object fields: `title?`, `description?`, `argsSchema?`
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```typescript
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// v1: server.resource(name, uri, callback)
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server.resource('config', 'config://app', async (uri) => {
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return { contents: [{ uri: uri.href, text: '{}' }] };
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server.resource('config', 'config://app', async uri => {
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return { contents: [{ uri: uri.href, text: '{}' }] };
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});
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// v2: server.registerResource(name, uri, metadata, callback)
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server.registerResource('config', 'config://app', {}, async (uri) => {
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return { contents: [{ uri: uri.href, text: '{}' }] };
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server.registerResource('config', 'config://app', {}, async uri => {
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return { contents: [{ uri: uri.href, text: '{}' }] };
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});
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```
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@ -180,7 +298,8 @@ extra.requestInfo?.headers.get('mcp-session-id')
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### Server-side auth
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All server OAuth exports removed: `mcpAuthRouter`, `OAuthServerProvider`, `OAuthTokenVerifier`, `requireBearerAuth`, `authenticateClient`, `ProxyOAuthServerProvider`, `allowedMethods`, and associated types. Use an external auth library (e.g., `better-auth`). See `examples/server/src/` for demos.
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All server OAuth exports removed: `mcpAuthRouter`, `OAuthServerProvider`, `OAuthTokenVerifier`, `requireBearerAuth`, `authenticateClient`, `ProxyOAuthServerProvider`, `allowedMethods`, and associated types. Use an external auth library (e.g., `better-auth`). See
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`examples/server/src/` for demos.
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### Host header validation (Express)
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@ -214,26 +333,26 @@ server.setNotificationHandler('notifications/message', (notification) => { ... }
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Schema to method string mapping:
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| v1 Schema | v2 Method String |
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|-----------|-----------------|
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| `InitializeRequestSchema` | `'initialize'` |
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| `CallToolRequestSchema` | `'tools/call'` |
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| `ListToolsRequestSchema` | `'tools/list'` |
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| `ListPromptsRequestSchema` | `'prompts/list'` |
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| `GetPromptRequestSchema` | `'prompts/get'` |
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| `ListResourcesRequestSchema` | `'resources/list'` |
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| `ReadResourceRequestSchema` | `'resources/read'` |
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| `CreateMessageRequestSchema` | `'sampling/createMessage'` |
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| `ElicitRequestSchema` | `'elicitation/create'` |
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| `SetLevelRequestSchema` | `'logging/setLevel'` |
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| `PingRequestSchema` | `'ping'` |
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| `LoggingMessageNotificationSchema` | `'notifications/message'` |
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| `ToolListChangedNotificationSchema` | `'notifications/tools/list_changed'` |
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| v1 Schema | v2 Method String |
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| --------------------------------------- | ---------------------------------------- |
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| `InitializeRequestSchema` | `'initialize'` |
|
||||
| `CallToolRequestSchema` | `'tools/call'` |
|
||||
| `ListToolsRequestSchema` | `'tools/list'` |
|
||||
| `ListPromptsRequestSchema` | `'prompts/list'` |
|
||||
| `GetPromptRequestSchema` | `'prompts/get'` |
|
||||
| `ListResourcesRequestSchema` | `'resources/list'` |
|
||||
| `ReadResourceRequestSchema` | `'resources/read'` |
|
||||
| `CreateMessageRequestSchema` | `'sampling/createMessage'` |
|
||||
| `ElicitRequestSchema` | `'elicitation/create'` |
|
||||
| `SetLevelRequestSchema` | `'logging/setLevel'` |
|
||||
| `PingRequestSchema` | `'ping'` |
|
||||
| `LoggingMessageNotificationSchema` | `'notifications/message'` |
|
||||
| `ToolListChangedNotificationSchema` | `'notifications/tools/list_changed'` |
|
||||
| `ResourceListChangedNotificationSchema` | `'notifications/resources/list_changed'` |
|
||||
| `PromptListChangedNotificationSchema` | `'notifications/prompts/list_changed'` |
|
||||
| `ProgressNotificationSchema` | `'notifications/progress'` |
|
||||
| `CancelledNotificationSchema` | `'notifications/cancelled'` |
|
||||
| `InitializedNotificationSchema` | `'notifications/initialized'` |
|
||||
| `PromptListChangedNotificationSchema` | `'notifications/prompts/list_changed'` |
|
||||
| `ProgressNotificationSchema` | `'notifications/progress'` |
|
||||
| `CancelledNotificationSchema` | `'notifications/cancelled'` |
|
||||
| `InitializedNotificationSchema` | `'notifications/initialized'` |
|
||||
|
||||
Request/notification params remain fully typed. Remove unused schema imports after migration.
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue