Support MCP( WIP) #5974
Support MCP( WIP) #5974
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WalkthroughThis pull request introduces significant enhancements to the NextChat application by implementing the Message Control Protocol (MCP). Key changes include the addition of modules for MCP client management, logging, and configuration. The application now supports dynamic client initialization, server interactions, and improved logging capabilities. Modifications span multiple files, adding functionality for handling MCP actions, configuring servers, and integrating MCP processing into the chat system. Additionally, the supported AI models have been updated in the documentation. Changes
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Actionable comments posted: 2
🧹 Nitpick comments (9)
app/store/chat.ts (1)
429-447: Validate JSON parsing & protect against malformed message content
- The regular expression approach to identify ```json:mcp blocks is functional, but consider graceful fallbacks if the block is missing or incomplete.
- You already catch JSON parsing errors, which is good. In case of invalid JSON from user-provided data, ensuring a user-facing error response could be beneficial.
- If multiple MCP calls can happen concurrently, verify the system’s concurrency handling to avoid race conditions.
app/mcp/actions.ts (1)
1-33: Leverage stronger typing and ensure concurrency safety
- Currently,
fsClientis typed asany—consider adding an explicit interface or type to make maintenance easier and reduce accidental misuse.- When multiple calls happen in quick succession, ensure
initFileSystemClientcan safely handle simultaneous initialization requests.app/mcp/logger.ts (1)
1-60: Ensure cross-platform log compatibility
- ANSI color codes might not display as intended across all terminals (e.g., some CI/CD environments or Windows shells).
- Consider adding timestamps or structured logging for easier troubleshooting and correlation with other logs.
app/mcp/client.ts (4)
1-5: Use absolute imports selectively.Imports from the "@modelcontextprotocol" package and Zod library are fine. However, ensure that these external imports remain minimal for faster builds and better maintainability. If future code only requires submodules, consider selective imports from large packages (e.g.,
import { ... } from "@modelcontextprotocol/sdk/client").
6-10: Clarify optional fields inServerConfiginterface.Currently,
argsandenvare optional. Provide doc comments describing the scenarios in which these fields would be omitted to improve code clarity.
44-47: ValidatePrimitivestructure and values.As
Primitive.valueis typed toany, adding a Zod schema or another validation layer for resource, tool, or prompt objects can improve type safety and help catch unexpected data structures from the server.
83-87: Use structured logging for request execution.Currently, you only do
console.log(r)after executing the request. Consider usinglogger.infoor a more structured approach to log request/response pairs for debugging and auditing.... const r = client.request(request, z.any()); - console.log(r); + logger.info("Request response:", r); return r; }tsconfig.json (1)
26-26: Cleanup references to removed files ininclude.Removing
"app/calcTextareaHeight.ts"from theincludearray is fine. Ensure that all references (e.g., imports) to that file are also removed throughout the codebase to avoid confusion.package.json (1)
25-25: Leverage the@modelcontextprotocol/sdkdependency effectively.Ensure that all relevant modules from the new SDK are utilized. If only a small subset is needed, consider partial imports or code splitting to reduce bundle size.
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📒 Files selected for processing (9)
app/mcp/actions.ts(1 hunks)app/mcp/client.ts(1 hunks)app/mcp/example.ts(1 hunks)app/mcp/logger.ts(1 hunks)app/mcp/mcp_config.ts(1 hunks)app/store/chat.ts(2 hunks)next.config.mjs(3 hunks)package.json(2 hunks)tsconfig.json(2 hunks)
🔇 Additional comments (8)
app/store/chat.ts (1)
32-32: Add test coverage for 'executeMcpAction' usage
The new import integrates MCP action processing into the chat flow. To reduce the risk of unhandled edge cases (e.g., unavailable server, invalid JSON structures, etc.), please ensure the code path invoking executeMcpAction is tested thoroughly.
app/mcp/mcp_config.ts (1)
1-40: Secure storage of credentials and externalize paths
- The placeholders for API keys and tokens should never be replaced by real secrets in the repository; instead, reading from environment variables or a vault is recommended.
- The path
"/Users/kadxy/Desktop"is hard-coded. Consider making this path configurable for different environments.
app/mcp/example.ts (1)
1-92: Harden the file reading mechanism
- The code showcases reading arbitrary files from a specified path. Confirm that server-side controls or directory whitelisting is in place to guard against unauthorized access.
- Good job using Zod schemas for validation—this helps ensure the integrity of server responses.
app/mcp/client.ts (1)
49-81: Parallel asynchronous operations are well handled; keep an eye on performance.
The approach of collecting promises in an array and awaiting them simultaneously is a good practice. For large-scale data, ensure the server handles concurrent calls effectively to avoid resource contention or throttling.
next.config.mjs (2)
35-35: Ensure experimental features are stable enough for production.
serverActions: true is an experimental feature. Confirm that your production environment accepts potential breaking changes or instabilities. Consider adding a feature gate or fallback logic.
75-78: Maintain consistent pattern for rewrite placeholders.
Rewrite placeholders, such as :resource_name and :deploy_name, are used in the destination URL. Confirm that you handle all edge cases (like missing or invalid resource_name / deploy_name). Potentially add server-side validation to avoid runtime errors.
tsconfig.json (1)
3-3: Check compatibility of ES2022 target.
Confirm that your deployment environment supports ES2022 features, or use a transpilation step if targeting older browsers. Some hosting platforms may not yet fully support ES2022 natively.
package.json (1)
57-58: Check versions & synergy for zod and zustand.
zod is now widely used for schema validation. Keep an eye on potential conflicts when using zustand for state management if any store-based validations are needed.
app/mcp/client.ts
Outdated
| export async function createClient( | ||
| serverConfig: ServerConfig, | ||
| name: string, | ||
| ): Promise<Client> { | ||
| logger.info(`Creating client for server ${name}`); | ||
|
|
||
| const transport = new StdioClientTransport({ | ||
| command: serverConfig.command, | ||
| args: serverConfig.args, | ||
| env: serverConfig.env, | ||
| }); | ||
| const client = new Client( | ||
| { | ||
| name: `nextchat-mcp-client-${name}`, | ||
| version: "1.0.0", | ||
| }, | ||
| { | ||
| capabilities: { | ||
| roots: { | ||
| // listChanged indicates whether the client will emit notifications when the list of roots changes. | ||
| // listChanged 指示客户端在根列表更改时是否发出通知。 | ||
| listChanged: true, | ||
| }, | ||
| }, | ||
| }, | ||
| ); | ||
| await client.connect(transport); | ||
| return client; | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Consider robust error handling for client creation.
When creating the client and connecting to the transport (line 40), include error handling for potential failures (e.g., invalid command, environment issues). This ensures unexpected errors are caught gracefully.
...
await client.connect(transport);
+ // TODO: Consider wrapping this in try/catch:
+ // try {
+ // await client.connect(transport);
+ // } catch (err) {
+ // logger.error('Failed to connect to transport', err);
+ // throw err;
+ // }
return client;
}Committable suggestion skipped: line range outside the PR's diff.
| @@ -49,11 +50,12 @@ | |||
| "remark-breaks": "^3.0.2", | |||
| "remark-gfm": "^3.0.1", | |||
| "remark-math": "^5.1.1", | |||
| "rt-client": "https://github.com/Azure-Samples/aoai-realtime-audio-sdk/releases/download/js/v0.5.0/rt-client-0.5.0.tgz", | |||
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💡 Codebase verification
Warning: The rt-client dependency is actively used and cannot be removed
The rt-client package is an essential dependency that is actively used in the realtime chat functionality:
- It's imported and used extensively in
app/components/realtime-chat/realtime-chat.tsx - Core functionalities depend on it:
- Real-time audio streaming and processing
- Voice chat features
- Server communication for real-time responses
- Audio transcription and playback
Removing this dependency would break the real-time chat feature. The package should be kept unless there's a planned replacement or the real-time chat functionality is being removed.
🔗 Analysis chain
Confirm removal of the deprecated rt-client dependency.
Verify that no modules still rely on rt-client. Skipping this verification might lead to runtime errors if references remain.
Let me gather more information about the actual usage of rt-client in the code.
Let me check the actual usage in the realtime-chat.tsx file to understand if this is an active dependency.
🏁 Scripts executed
The following scripts were executed for the analysis:
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rg 'rt-client' -A 3 -B 3
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#!/bin/bash
# Check for imports and actual usage of rt-client in the realtime components
ast-grep --pattern 'import { $$$ } from "rt-client"'
# Check for any direct usage of rt-client package
rg -l 'new RTClient|RTClient\.'
Length of output: 675
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#!/bin/bash
# Check the implementation in realtime-chat.tsx
cat app/components/realtime-chat/realtime-chat.tsx
Length of output: 10998
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Actionable comments posted: 2
🧹 Nitpick comments (12)
app/mcp/actions.ts (3)
7-17: Global variables and maps
Storing clients in a globalMapand a globalinitializedflag may be problematic in multi-instance or serverless environments. Consider a more robust design (e.g., an initialization manager) if concurrency or horizontal scaling are required.
18-51: initializeMcpClients function
- Code loops over
conf.mcpServersand initializes each client with proper logging.- Catches errors and tracks failed clients in
errorClients.- Marks
initialized = trueto prevent reinitialization.- Logs final status and available clients.
This flow is user-friendly and understandable. Consider adding retries or fallback logic for partial initialization failures.
53-70: executeMcpAction function
- Fetches the client from
clientsMapby ID and executes the request.- Logs any execution errors and rethrows them.
Consider returning a standardized error object for better client-side handling, especially if this function may be extended for user-facing error messages in the future.app/store/chat.ts (2)
363-367: MCP check on new messages
Line 366 callscheckMcpJsonwhenever a new message arrives. This integration ensures automatic detection of MCP requests without additional code in the message pipeline. Be sure to handle potential performance impacts if message volume is very high.
773-798: checkMcpJson function
- Validates if message content matches MCP JSON format.
- On success, extracts the MCP payload and invokes
executeMcpAction.- Uses
onUserInputto feed back results as a new message.
This is a clean, modular approach. However, watch for large JSON payloads or malicious content. Consider adding rate-limits or size checks for production.app/mcp/utils.ts (2)
1-3: isMcpJson function
Returns the match result of a regex. This function is concise but slightly at risk of returning null or array. Consider returning a boolean explicitly (!!content.match(...)) if you only need a truthy check.
5-11: extractMcpJson function
CapturesclientIdand parses JSON from the second capture group. The approach is straightforward. A try-catch block for JSON parsing (or an upfront validity check) might guard against syntax errors or maliciously malformed JSON.app/page.tsx (1)
9-10: Await MCP initialization
Blocking initialization ensures MCP dependencies are ready before UI rendering. Ensure that this call won’t degrade page responsiveness for users if the initialization is slow. Consider deferring or parallelizing if needed.app/mcp/logger.ts (1)
24-65: Logging methods
- Provides functions for info, success, error, warn, and debug with consistent output formatting.
debugis controlled by a flag to prevent noisy logs.- A structured
formatMessagemethod safely handles objects.
Well-structured, though consider a fallback or custom transport in production to integrate with external logging systems (e.g., Winston, Bunyan).app/mcp/client.ts (3)
32-35: Document or remove commented capabilities configuration.The commented capabilities configuration lacks explanation. Either document why it's preserved for future use or remove it if unnecessary.
28-28: Consider extracting version to a configuration constant.The hardcoded version "1.0.0" should be moved to a configuration constant for better maintainability.
+const CLIENT_VERSION = "1.0.0"; export async function createClient( serverConfig: ServerConfig, name: string, ): Promise<Client> { // ... const client = new Client( { name: `nextchat-mcp-client-${name}`, - version: "1.0.0", + version: CLIENT_VERSION, }, // ... );
52-76: Refactor duplicate promise handling pattern.The promise handling pattern is repeated for resources, tools, and prompts. Consider extracting this to a helper function.
+const createPrimitivePromise = ( + client: Client, + type: Primitive["type"], + listFn: () => Promise<{ [key: string]: any[] }> +) => { + return listFn().then((result) => { + const items = result[`${type}s`]; + items.forEach((item) => primitives.push({ type, value: item })); + }); +}; if (capabilities?.resources) { - promises.push( - client.listResources().then(({ resources }) => { - resources.forEach((item) => - primitives.push({ type: "resource", value: item }), - ); - }), - ); + promises.push(createPrimitivePromise(client, "resource", () => client.listResources())); }
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📒 Files selected for processing (10)
.eslintignore(1 hunks)app/mcp/actions.ts(1 hunks)app/mcp/client.ts(1 hunks)app/mcp/example.ts(1 hunks)app/mcp/logger.ts(1 hunks)app/mcp/mcp_config.json(1 hunks)app/mcp/utils.ts(1 hunks)app/page.tsx(1 hunks)app/store/chat.ts(4 hunks)package.json(3 hunks)
✅ Files skipped from review due to trivial changes (2)
- .eslintignore
- app/mcp/mcp_config.json
🚧 Files skipped from review as they are similar to previous changes (2)
- app/mcp/example.ts
- package.json
🔇 Additional comments (10)
app/mcp/actions.ts (3)
1-2: Use of "use server" directive
These lines establish a server-only execution context. Be mindful of referencing browser-specific APIs in server files to avoid runtime errors.
3-6: Import dependencies
Imports for createClient, executeRequest, MCPClientLogger, and the JSON config look consistent with the intended usage. Ensure that underlying modules handle errors gracefully.
72-77: getAvailableClients function
Filters out clients that failed to initialize. This is straightforward and aligns with the error management strategy. Ensure future expansions remain in sync (e.g., re-checking previously error-prone clients).
app/store/chat.ts (2)
32-33: New MCP imports
Imports from mcp/actions and mcp/utils introduce the MCP functionality into the chat store. This is a logical location given the store’s role in handling messages.
434-434: Asynchronous onFinish callback
This line suggests the onFinish callback is asynchronous. Confirm that all references to onFinish handle promises and potential errors correctly to avoid unhandled promise rejections.
app/page.tsx (1)
4-4: Import initializeMcpClients
This sets up a new dependency on actions.ts. Verify that all required environment variables and config references are available at runtime.
app/mcp/logger.ts (2)
1-10: Color codes definition
Defines ANSI codes for styling the log output. Straightforward and correct for Node.js environments.
12-22: Logger constructor and fields
The prefix and debugMode options provide flexible logging. This is a neat approach for customizing logs.
app/mcp/client.ts (2)
1-10: LGTM! Well-structured imports and interface definition.
The ServerConfig interface is well-designed with appropriate optional parameters for args and env configuration.
14-40: Add error handling for client creation and connection.
The client creation process should include proper error handling for transport creation and connection failures.
|
|
||
| interface Primitive { | ||
| type: "resource" | "tool" | "prompt"; | ||
| value: any; |
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🛠️ Refactor suggestion
Replace 'any' type with a more specific type.
Using 'any' type reduces type safety. Consider defining specific types for resource, tool, and prompt values.
app/mcp/client.ts
Outdated
| /** Execute a request */ | ||
| export async function executeRequest(client: Client, request: any) { | ||
| return client.request(request, z.any()); | ||
| } |
There was a problem hiding this comment.
Improve request validation and error handling.
The current implementation has several concerns:
- Using
z.any()bypasses the benefits of Zod's type validation - No request validation before execution
- No error handling for failed requests
Consider implementing proper validation and error handling:
-export async function executeRequest(client: Client, request: any) {
- return client.request(request, z.any());
+export async function executeRequest(client: Client, request: unknown) {
+ const requestSchema = z.object({
+ // Define your request schema here
+ // Example:
+ // method: z.string(),
+ // params: z.record(z.unknown())
+ });
+
+ try {
+ const validatedRequest = requestSchema.parse(request);
+ return await client.request(validatedRequest, z.unknown());
+ } catch (error) {
+ if (error instanceof z.ZodError) {
+ throw new Error(`Invalid request format: ${error.message}`);
+ }
+ throw error;
+ }
+}Committable suggestion skipped: line range outside the PR's diff.
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Actionable comments posted: 0
🧹 Nitpick comments (6)
app/store/chat.ts (2)
Line range hint
376-402: Enhance type safety in onUserInput function.The function could benefit from improved type safety:
- The
isMcpResponseparameter should have a default value since it's optional- The content type assertion should be more explicit
Consider applying these changes:
async onUserInput( content: string, attachImages?: string[], - isMcpResponse?: boolean, + isMcpResponse: boolean = false, ) { const session = get().currentSession(); const modelConfig = session.mask.modelConfig; - let mContent: string | MultimodalContent[] = isMcpResponse + let mContent: string | MultimodalContent[] = isMcpResponse === true ? content : fillTemplateWith(content, modelConfig);
782-810: Enhance error handling and maintainability in checkMcpJson.Consider the following improvements:
- Add specific error type handling
- Add debug logging for the response formatting
- Extract JSON response formatting to a separate function
Consider applying these changes:
checkMcpJson(message: ChatMessage) { const content = getMessageTextContent(message); if (isMcpJson(content)) { try { const mcpRequest = extractMcpJson(content); if (mcpRequest) { console.debug("[MCP Request]", mcpRequest); executeMcpAction(mcpRequest.clientId, mcpRequest.mcp) .then((result) => { console.log("[MCP Response]", result); - const mcpResponse = - typeof result === "object" - ? JSON.stringify(result) - : String(result); + const mcpResponse = formatMcpResponse(result); + console.debug("[MCP Formatted Response]", mcpResponse); get().onUserInput( `\`\`\`json:mcp:${mcpRequest.clientId}\n${mcpResponse}\n\`\`\``, [], true, ); }) - .catch((error) => showToast(String(error))); + .catch((error) => { + console.error("[MCP Execution Error]", error); + showToast(error instanceof Error ? error.message : String(error)); + }); } - } catch (error) { + } catch (error: unknown) { console.error("[MCP Error]", error); + showToast("Failed to process MCP request"); } } }, + function formatMcpResponse(result: unknown): string { + return typeof result === "object" ? JSON.stringify(result) : String(result); + }app/mcp/types.ts (2)
1-2: Optional: Confirm the specification link remains stable.The comment references an external spec URL. If it’s crucial, ensure the link remains valid. If the spec is versioned, consider pinning a specific version for documentation stability.
21-32: Response interface structure is flexible and aligns well with standard JSON-RPC patterns.The
errorstructure is appropriately typed, ensuring systematic error reporting. Consider adding clearer distinction for success vs. error states if your logic requires it.app/mcp/client.ts (2)
43-46: Primitive interface uses 'any'.Using
anytype forvaluereduces type safety. Define a union or more explicit shape if the data is known.-interface Primitive { - type: "resource" | "tool" | "prompt"; - value: any; -} +interface Resource { /* shape */} +interface Tool { /* shape */} +interface Prompt { /* shape */} +type PrimitiveValue = Resource | Tool | Prompt; + +interface Primitive { + type: "resource" | "tool" | "prompt"; + value: PrimitiveValue; +}
48-80: listPrimitives merges capability checks with asynchronous calls.
- The approach is valid and merges results from multiple promises.
- Consider an early break if no capabilities exist to optimize performance in some edge cases.
- See if any concurrency issues might arise if the server is large or if many resources are loaded at once.
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📒 Files selected for processing (4)
app/mcp/actions.ts(1 hunks)app/mcp/client.ts(1 hunks)app/mcp/types.ts(1 hunks)app/store/chat.ts(7 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
- app/mcp/actions.ts
🔇 Additional comments (14)
app/store/chat.ts (4)
Line range hint 1-37: LGTM! Import changes are well-organized.
The new imports for MCP functionality are properly structured and necessary for the implementation.
62-62: LGTM! Type extension is clean and minimal.
The addition of isMcpResponse to ChatMessage type is well-typed and follows TypeScript best practices.
368-372: LGTM! Clean integration of MCP checking.
The addition of checkMcpJson call is well-placed and maintains the existing message processing flow.
Line range hint 1-810: Verify integration with existing chat functionality.
Since this is a WIP PR adding MCP support, please ensure:
- The changes don't affect existing chat functionality
- Error states are properly propagated to the UI
- MCP responses don't break the chat history display
✅ Verification successful
Based on the verification results, I can now provide a final response:
MCP integration maintains existing chat functionality with proper error handling
The code review shows that the MCP (Message Control Protocol) integration:
-
Properly maintains existing chat functionality:
- Core message handling (
onNewMessage,onUserInput) remains intact - Message rendering and display components are unaffected
- Existing error states and UI feedback are preserved
- Core message handling (
-
Has appropriate error handling:
- MCP errors are caught and displayed via
showToast - Failed MCP actions are properly logged:
console.error("[MCP Error]", error) - Error states are propagated to the UI through existing message error flags
- MCP errors are caught and displayed via
-
Safely integrates with chat history:
- MCP responses are clearly marked with
isMcpResponseflag - Messages are properly added to chat history with correct formatting
- Template handling is properly skipped for MCP responses
- MCP responses are clearly marked with
🏁 Scripts executed
The following scripts were executed for the analysis:
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app/mcp/types.ts (5)
5-12: Interfaces with typed methods and flexible params are well structured.
The McpRequestMessage interface design uses a union for the id and retains flexibility in params. This is good for requests where the schema can evolve over time.
14-20: Schema validation ensures robust request handling.
Good use of Zod for optional jsonrpc and union types for id. This schema can mitigate malformed requests by typechecking at runtime.
34-47: Robust schema for JSON-RPC responses.
The optional error object’s shape is well-defined. Ensure the client code handles partial responses (e.g., result or error fields) gracefully.
49-55: Encapsulated notifications match JSON-RPC patterns.
Separating notifications into a distinct interface clarifies the difference between requests and notifications.
57-61: Notifications schema aligns with the interface.
The use of z.record(z.unknown()) for params preserves flexibility while still enforcing structural constraints.
app/mcp/client.ts (5)
1-6: Imports are consistent and descriptive.
All necessary dependencies (Client, StdioClientTransport, custom logger, and McpRequestMessage) are imported cleanly. The use of zod is appropriate for runtime type checks.
7-11: ServerConfig is concise and extendable.
Storing command, arguments, and environment variables in an interface fosters clarity. If future expansions are likely (e.g., working directories, timeouts), consider grouping them under optional sub-objects or adding additional properties.
13-14: Logger usage is straightforward.
A dedicated logger is beneficial for debugging and operational visibility. Ensure logging levels are adjustable in production environments if needed.
15-41: createClient handles basic client setup.
- Logging the server name is helpful for troubleshooting.
- Consider error handling around
client.connectin case the process fails to start or times out.
Would you like a script to search for unhandled promise rejections around connect calls and propose structured error-handling code if discovered?
82-88: 🛠️ Refactor suggestion
executeRequest returns data without intermediate validation or error handling.
Even though z.any() is used, you might want stronger type checks if the response format is critical. Also, consider how errors from client.request are caught and propagated.
export async function executeRequest(
client: Client,
request: McpRequestMessage,
) {
- return client.request(request, z.any());
+ try {
+ const response = await client.request(request, z.unknown());
+ // Potentially parse the response with the McpResponseMessageSchema
+ return McpResponseMessageSchema.parse(response);
+ } catch (err) {
+ logger.error('Failed to execute MCP request', err);
+ throw err;
+ }
}Likely invalid or redundant comment.
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Actionable comments posted: 0
🧹 Nitpick comments (2)
app/mcp/actions.ts (1)
66-86: Enhance error handling with specific error types.The error handling could be more specific to help with debugging and user feedback.
export async function executeMcpAction( clientId: string, request: McpRequestMessage, ) { try { const client = clientsMap.get(clientId)?.client; if (!client) { - logger.error(`Client ${clientId} not found`); - return; + throw new Error(`MCP client '${clientId}' not found`); } logger.info(`Executing MCP request for ${clientId}`); return await executeRequest(client, request); } catch (error) { - logger.error(`MCP execution error: ${error}`); - throw error; + const errorMessage = error instanceof Error ? error.message : String(error); + logger.error(`MCP execution error for client '${clientId}':`, errorMessage); + throw new Error(`Failed to execute MCP action: ${errorMessage}`); } }app/store/chat.ts (1)
813-840: Enhance error handling in MCP JSON processing.The error handling could be more specific and provide better user feedback.
checkMcpJson(message: ChatMessage) { const content = getMessageTextContent(message); if (isMcpJson(content)) { try { const mcpRequest = extractMcpJson(content); if (mcpRequest) { console.debug("[MCP Request]", mcpRequest); executeMcpAction(mcpRequest.clientId, mcpRequest.mcp) .then((result) => { console.log("[MCP Response]", result); const mcpResponse = typeof result === "object" ? JSON.stringify(result) : String(result); get().onUserInput( `\`\`\`json:mcp-response:${mcpRequest.clientId}\n${mcpResponse}\n\`\`\``, [], true, ); }) - .catch((error) => showToast("MCP execution failed", error)); + .catch((error) => { + const errorMessage = error instanceof Error ? error.message : String(error); + showToast( + "MCP Execution Failed", + `Failed to execute MCP action for client '${mcpRequest.clientId}': ${errorMessage}` + ); + console.error("[MCP Execution Error]", error); + }); } } catch (error) { - console.error("[MCP Error]", error); + const errorMessage = error instanceof Error ? error.message : String(error); + console.error("[MCP Processing Error]", error); + showToast( + "MCP Processing Failed", + `Failed to process MCP message: ${errorMessage}` + ); } } }
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📒 Files selected for processing (6)
app/components/chat.tsx(11 hunks)app/constant.ts(1 hunks)app/mcp/actions.ts(1 hunks)app/mcp/client.ts(1 hunks)app/mcp/example.ts(1 hunks)app/store/chat.ts(11 hunks)
✅ Files skipped from review due to trivial changes (1)
- app/components/chat.tsx
🚧 Files skipped from review as they are similar to previous changes (1)
- app/mcp/example.ts
🔇 Additional comments (7)
app/constant.ts (2)
256-261: LGTM! Well-structured template for MCP primitives.The template clearly separates clientId and primitives sections with good formatting.
263-365: LGTM! Comprehensive system template with clear documentation.The template provides:
- Clear sections for tools, usage rules, and interaction flow
- Well-documented examples
- Proper markdown formatting for code blocks
app/mcp/client.ts (3)
43-46: 🛠️ Refactor suggestionReplace 'any' type with a more specific type.
The
valuefield uses theanytype which reduces type safety. Consider defining a proper type or interface.export interface Primitive { type: "resource" | "tool" | "prompt"; - value: any; + value: { + name: string; + description?: string; + parameters?: Record<string, unknown>; + }; }Likely invalid or redundant comment.
82-88: 🛠️ Refactor suggestionImprove request validation.
The function uses
z.any()which bypasses Zod's type validation benefits. Consider implementing proper validation schema.export async function executeRequest( client: Client, request: McpRequestMessage, ) { - return client.request(request, z.any()); + const responseSchema = z.object({ + // Define expected response schema + result: z.unknown(), + error: z.string().optional(), + }); + return client.request(request, responseSchema); }Likely invalid or redundant comment.
15-41:⚠️ Potential issueAdd error handling for client connection.
The client connection lacks error handling which could lead to unhandled promise rejections.
export async function createClient( serverConfig: ServerConfig, name: string, ): Promise<Client> { logger.info(`Creating client for server ${name}`); const transport = new StdioClientTransport({ command: serverConfig.command, args: serverConfig.args, env: serverConfig.env, }); const client = new Client( { name: `nextchat-mcp-client-${name}`, version: "1.0.0", }, { capabilities: { // roots: { // listChanged: true, // }, }, }, ); - await client.connect(transport); + try { + await client.connect(transport); + } catch (error) { + logger.error(`Failed to connect client ${name}:`, error); + throw new Error(`Failed to initialize MCP client ${name}: ${error.message}`); + } return client; }Likely invalid or redundant comment.
app/mcp/actions.ts (1)
28-63: LGTM! Well-implemented initialization with proper error handling.The function includes:
- Singleton pattern to prevent multiple initializations
- Comprehensive error handling
- Good logging of success and failure cases
app/store/chat.ts (1)
201-219: LGTM! Well-implemented system prompt generation.The function effectively:
- Filters relevant primitives
- Handles template replacement
- Maintains clear structure
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Actionable comments posted: 7
🧹 Nitpick comments (14)
app/constant.ts (1)
264-366: Consider enhancing the system template documentation.The template is well-structured with comprehensive documentation. Consider these improvements:
- Add version information to track template changes
- Use more realistic paths in examples (e.g.,
~/DesktoporC:\Users\username\Desktop)export const MCP_SYSTEM_TEMPLATE = ` +// Template Version: 1.0.0 You are an AI assistant with access to system tools... 5. EXAMPLE INTERACTION: User: "What files do I have on my desktop?" Assistant: "I'll check which directories I have access to. \`\`\`json:mcp:filesystem { "method": "tools/call", "params": { "name": "list_allowed_directories", "arguments": {} } } \`\`\`" User: "\`\`\`json:mcp-response:filesystem { - "directories": ["/path/to/desktop"] + "directories": ["~/Desktop"] } \`\`\`"app/mcp/actions.ts (3)
52-68: ConsolidatereinitializeMcpClientsandrestartAllClientsFunctionsThe functions
reinitializeMcpClients(lines 52-68) andrestartAllClients(lines 179-194) perform similar actions: closing clients, clearing states, and reinitializing MCP clients. To avoid code duplication and improve maintainability, consider refactoringrestartAllClientsto callreinitializeMcpClients.Apply this refactor:
export async function restartAllClients() { logger.info("Restarting all MCP clients..."); - // 清空状态 - clientsMap.clear(); - errorClients = []; - initialized = false; - - // 重新初始化 - await initializeMcpClients(); + // Delegate to reinitializeMcpClients + await reinitializeMcpClients(); return { success: errorClients.length === 0, errorClients, }; }
123-127: Improve Error Handling When Client Is Not FoundIn the
executeMcpActionfunction (lines 123-127), when a client is not found, the function logs an error but does not throw an exception or provide feedback to the caller. This could lead to silent failures. Consider throwing an error to ensure that the calling function can handle this scenario appropriately.Apply this change:
const client = clientsMap.get(clientId)?.client; if (!client) { logger.error(`Client ${clientId} not found`); - return; + throw new Error(`Client ${clientId} not found`); }
197-216: CombinegetAllClientStatusandgetClientErrorsFunctionsThe functions
getAllClientStatus(lines 197-205) andgetClientErrors(lines 208-216) both return a record of client IDs to their error messages. To reduce redundancy, consider combining these functions into one or clarifying their distinct purposes if they are intended to provide different information.app/components/mcp-market.tsx (2)
185-250: RefactorrenderConfigFormto Improve ReadabilityThe
renderConfigFormfunction (lines 181-250) handles multiple input types and contains nested loops and conditional logic, making it complex. Consider refactoring by extracting input field rendering into separate components to enhance readability and maintainability.
436-438: Handle Long Descriptions in Server InfoIn the server info section (lines 436-438), long descriptions may overflow or break the layout. Consider adding CSS styles to handle text overflow, such as ellipsis, or provide tooltips for full descriptions.
app/components/home.tsx (1)
77-83: Maintain Consistent Import OrderThe import order of
useEffectanduseState(line 5) deviates from the convention used in the rest of the file, where hooks are typically imported after other modules. Consider reorganizing the imports for consistency.app/mcp/types.ts (2)
5-61: LGTM! Well-structured message types with proper validation.The MCP message interfaces and schemas are well-defined and properly validated using Zod. The implementation follows the JSON-RPC 2.0 specification.
Consider adding:
- JSDoc comments for better IDE integration
- Examples of valid message structures
- Constants for common error codes
Example:
/** MCP request message following JSON-RPC 2.0 specification */ export interface McpRequestMessage { /** JSON-RPC version. Must be "2.0" when present */ jsonrpc?: "2.0"; // ... rest of the interface } /** Common MCP error codes */ export const McpErrorCodes = { PARSE_ERROR: -32700, INVALID_REQUEST: -32600, METHOD_NOT_FOUND: -32601, // ... add more error codes } as const;
63-99: LGTM! Well-designed server configuration types.The server configuration interfaces provide good type safety and flexibility for different server configurations.
Consider adding:
- Type guards for runtime validation
- Utility functions for configuration validation
- Constants for common server types
Example:
export const SERVER_TYPES = { FILESYSTEM: 'filesystem', DOCKER: 'docker-mcp', POSTGRES: 'postgres', // ... add more server types } as const; export type ServerType = typeof SERVER_TYPES[keyof typeof SERVER_TYPES]; export function isValidServerConfig(config: unknown): config is ServerConfig { // Add runtime validation logic }app/mcp/preset-server.json (2)
74-78: Enhance database connection securityBoth MongoDB and PostgreSQL configurations use plain connection strings. Consider:
- Supporting connection options (SSL, timeout, etc.)
- Implementing credential management
- Adding connection pooling configuration
Also applies to: 138-142
161-165: Add API configuration safeguardsFor both Brave Search and Google Maps APIs, consider adding:
- Rate limiting configuration
- Error handling guidance
- API key rotation support
Also applies to: 184-188
app/components/mcp-market.module.scss (3)
86-95: Extract status colors to CSS variablesReplace hardcoded colors with CSS variables for consistency:
- background-color: #10b981; + background-color: var(--status-success); - background-color: #ef4444; + background-color: var(--status-error); - background-color: #f59e0b; + background-color: var(--status-warning);
188-389: Reduce style duplication with mixinsConsider extracting common input styles into SCSS mixins:
- Form input styles
- Button hover/focus states
- Common transitions
574-612: Move global styles to a separate fileGlobal styles should be moved to a dedicated global stylesheet to:
- Prevent scope conflicts
- Improve maintainability
- Better separate concerns
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⛔ Files ignored due to path filters (2)
app/icons/mcp.svgis excluded by!**/*.svgyarn.lockis excluded by!**/yarn.lock,!**/*.lock
📒 Files selected for processing (13)
app/components/home.tsx(4 hunks)app/components/mcp-market.module.scss(1 hunks)app/components/mcp-market.tsx(1 hunks)app/components/sidebar.tsx(2 hunks)app/constant.ts(2 hunks)app/locales/cn.ts(1 hunks)app/mcp/actions.ts(1 hunks)app/mcp/mcp_config.json(1 hunks)app/mcp/preset-server.json(1 hunks)app/mcp/types.ts(1 hunks)app/mcp/utils.ts(1 hunks)app/store/chat.ts(11 hunks)next.config.mjs(2 hunks)
✅ Files skipped from review due to trivial changes (1)
- next.config.mjs
🚧 Files skipped from review as they are similar to previous changes (2)
- app/mcp/utils.ts
- app/store/chat.ts
🔇 Additional comments (11)
app/constant.ts (3)
50-50: LGTM! Path addition follows conventions.The new
McpMarketpath is well-structured and consistent with existing path definitions.
257-262: LGTM! Clean and focused template structure.The template follows the existing patterns and provides a clear structure for clientId and primitives interpolation.
257-367: LGTM! Well-integrated with existing constants.The new MCP-related constants are properly placed within the file's organization, maintaining logical grouping and following existing patterns.
app/mcp/actions.ts (1)
23-66:⚠️ Potential issueEnsure Thread-Safe Access to Shared State Variables
The module uses shared state variables (
clientsMap,initialized,errorClients) without synchronization mechanisms. If functions likeinitializeMcpClientsorreinitializeMcpClientsare called concurrently, it may lead to race conditions or inconsistent state. Consider implementing synchronization to ensure thread-safe operations.To verify concurrency issues, please review how and where these functions are invoked. If they can be called concurrently, synchronization mechanisms like mutexes or atomic variables should be introduced to protect shared state.
app/components/mcp-market.tsx (1)
253-270: Ensure Robust Error Handling When Loading PrimitivesIn the
loadPrimitivesfunction (lines 253-270), if the server is not running, an empty array is set forprimitives. Ensure that components consumingprimitivescan handle empty arrays without errors to prevent potential runtime issues.app/components/home.tsx (1)
77-83: Verify Dynamic Import Path forMcpMarketPageEnsure that the dynamic import path
'./mcp-market'(lines 77-83) correctly resolves to theMcpMarketPagecomponent. This is important for the component to load properly, especially in build and deployment environments.app/components/sidebar.tsx (1)
254-262: LGTM!The new MCP icon button is well-integrated into the sidebar, following the existing patterns for icon buttons and conditional rendering.
app/locales/cn.ts (1)
629-631: LGTM!The MCP localization entry follows the established pattern and maintains consistency with other localization entries.
app/mcp/preset-server.json (3)
11-16: Add path validation constraints for filesystem accessThe filesystem paths configuration lacks validation constraints. Consider adding:
- Path pattern restrictions
- Absolute/relative path validation
- Directory traversal prevention
35-39: Specify required GitHub token scopesThe GitHub PAT configuration should specify the minimum required scopes for security. Consider adding:
- List of required scopes in the description
- Scope validation in the implementation
199-204: Enhance Docker configuration securityThe Docker module lacks essential configuration options. Consider adding:
- Container resource limits
- Security options (e.g., no-new-privileges)
- Network access controls
| } catch (error) { | ||
| console.error("Failed to read MCP config:", error); | ||
| return { mcpServers: {} }; | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Handle Missing Configuration File Gracefully
In the getMcpConfig function (lines 35-38), if the configuration file is missing (e.g., on the first run), it logs an error. Instead, consider checking if the error is due to the file not existing (ENOENT) and initialize with a default configuration without logging an error. This provides a smoother user experience.
Apply this change:
} catch (error) {
- console.error("Failed to read MCP config:", error);
- return { mcpServers: {} };
+ if (error.code === 'ENOENT') {
+ logger.warn("MCP config file not found, initializing with default configuration.");
+ return { mcpServers: {} };
+ } else {
+ logger.error("Failed to read MCP config:", error);
+ throw error;
+ }
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| } catch (error) { | |
| console.error("Failed to read MCP config:", error); | |
| return { mcpServers: {} }; | |
| } | |
| } catch (error) { | |
| if (error.code === 'ENOENT') { | |
| logger.warn("MCP config file not found, initializing with default configuration."); | |
| return { mcpServers: {} }; | |
| } else { | |
| logger.error("Failed to read MCP config:", error); | |
| throw error; | |
| } | |
| } |
|
|
||
| try { | ||
| // 构建服务器配置 | ||
| const args = [...preset.baseArgs]; | ||
| const env: Record<string, string> = {}; | ||
|
|
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Add Null Checks for preset.configSchema Before Use
In the saveServerConfig function (lines 130-135), preset.configSchema is accessed without null checks. If preset.configSchema is undefined or null, it may cause runtime errors. Ensure that preset.configSchema is validated before accessing its properties.
Apply this change:
if (!preset || !preset.configSchema || !editingServerId) return;
+ if (!preset.configSchema) {
+ showToast("Server configuration schema is missing.");
+ return;
+ }Committable suggestion skipped: line range outside the PR's diff.
| const bError = clientErrors[b.id] !== null; | ||
|
|
||
| if (aAdded !== bAdded) { | ||
| return aAdded ? -1 : 1; | ||
| } | ||
| if (aAdded && bAdded) { | ||
| if (aError !== bError) { | ||
| return aError ? -1 : 1; | ||
| } | ||
| } | ||
| return 0; | ||
| }) |
There was a problem hiding this comment.
Correct Sorting Logic for Server Error Status
In the server list sorting logic (lines 389-404), the comparison of aError and bError may be inverted, causing servers with errors to appear before those without. Adjust the sorting condition to ensure servers without errors are prioritized.
Apply this fix:
if (aAdded && bAdded) {
if (aError !== bError) {
- return aError ? -1 : 1;
+ return aError ? 1 : -1;
}
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const bError = clientErrors[b.id] !== null; | |
| if (aAdded !== bAdded) { | |
| return aAdded ? -1 : 1; | |
| } | |
| if (aAdded && bAdded) { | |
| if (aError !== bError) { | |
| return aError ? -1 : 1; | |
| } | |
| } | |
| return 0; | |
| }) | |
| const bError = clientErrors[b.id] !== null; | |
| if (aAdded !== bAdded) { | |
| return aAdded ? -1 : 1; | |
| } | |
| if (aAdded && bAdded) { | |
| if (aError !== bError) { | |
| return aError ? 1 : -1; | |
| } | |
| } | |
| return 0; | |
| }) |
app/mcp/mcp_config.json
Outdated
| { | ||
| "mcpServers": { | ||
| "filesystem": { | ||
| "command": "npx", | ||
| "args": [ | ||
| "-y", | ||
| "@modelcontextprotocol/server-filesystem", | ||
| "/Users/kadxy/Desktop" | ||
| ] | ||
| }, | ||
| "docker-mcp": { | ||
| "command": "uvx", | ||
| "args": ["docker-mcp"] | ||
| }, | ||
| "difyworkflow": { | ||
| "command": "mcp-difyworkflow-server", | ||
| "args": ["-base-url", "23"], | ||
| "env": { | ||
| "DIFY_WORKFLOW_NAME": "23", | ||
| "DIFY_API_KEYS": "23" | ||
| } | ||
| }, | ||
| "postgres": { | ||
| "command": "docker", | ||
| "args": ["run", "-i", "--rm", "mcp/postgres", null] | ||
| }, | ||
| "playwright": { | ||
| "command": "npx", | ||
| "args": ["-y", "@executeautomation/playwright-mcp-server"] | ||
| }, | ||
| "gdrive": { | ||
| "command": "npx", | ||
| "args": ["-y", "@modelcontextprotocol/server-gdrive"] | ||
| } | ||
| } | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Add documentation and validation guidance.
The configuration file lacks documentation for server configurations and validation requirements.
Consider adding:
- A documentation section describing each server type and its purpose
- Required environment variables for each server
- Validation rules for configuration parameters
- Error handling guidance
Example structure:
{
"documentation": {
"version": "1.0",
"servers": {
"filesystem": {
"description": "Local filesystem MCP server",
"required_env": ["MCP_FILESYSTEM_PATH"],
"validation": {
"MCP_FILESYSTEM_PATH": "Must be a valid directory path"
}
},
// ... other servers
}
},
"mcpServers": {
// ... existing configurations
}
}
app/mcp/mcp_config.json
Outdated
| "postgres": { | ||
| "command": "docker", | ||
| "args": ["run", "-i", "--rm", "mcp/postgres", null] | ||
| }, |
There was a problem hiding this comment.
Fix null argument in postgres configuration.
The postgres server configuration contains a null argument which could cause runtime issues.
Remove the null argument or replace it with a valid value:
- "args": ["run", "-i", "--rm", "mcp/postgres", null]
+ "args": ["run", "-i", "--rm", "mcp/postgres"]📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| "postgres": { | |
| "command": "docker", | |
| "args": ["run", "-i", "--rm", "mcp/postgres", null] | |
| }, | |
| "postgres": { | |
| "command": "docker", | |
| "args": ["run", "-i", "--rm", "mcp/postgres"] | |
| }, |
app/mcp/mcp_config.json
Outdated
| "difyworkflow": { | ||
| "command": "mcp-difyworkflow-server", | ||
| "args": ["-base-url", "23"], | ||
| "env": { | ||
| "DIFY_WORKFLOW_NAME": "23", | ||
| "DIFY_API_KEYS": "23" | ||
| } | ||
| }, |
There was a problem hiding this comment.
Replace placeholder values in difyworkflow configuration.
The configuration contains placeholder values "23" for base URL and API keys, which are not valid production values.
Consider using environment variables:
- "args": ["-base-url", "23"],
+ "args": ["-base-url", "${DIFY_BASE_URL}"],
"env": {
- "DIFY_WORKFLOW_NAME": "23",
- "DIFY_API_KEYS": "23"
+ "DIFY_WORKFLOW_NAME": "${DIFY_WORKFLOW_NAME}",
+ "DIFY_API_KEYS": "${DIFY_API_KEYS}"
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| "difyworkflow": { | |
| "command": "mcp-difyworkflow-server", | |
| "args": ["-base-url", "23"], | |
| "env": { | |
| "DIFY_WORKFLOW_NAME": "23", | |
| "DIFY_API_KEYS": "23" | |
| } | |
| }, | |
| "difyworkflow": { | |
| "command": "mcp-difyworkflow-server", | |
| "args": ["-base-url", "${DIFY_BASE_URL}"], | |
| "env": { | |
| "DIFY_WORKFLOW_NAME": "${DIFY_WORKFLOW_NAME}", | |
| "DIFY_API_KEYS": "${DIFY_API_KEYS}" | |
| } | |
| }, |
app/mcp/mcp_config.json
Outdated
| "filesystem": { | ||
| "command": "npx", | ||
| "args": [ | ||
| "-y", | ||
| "@modelcontextprotocol/server-filesystem", | ||
| "/Users/kadxy/Desktop" | ||
| ] | ||
| }, |
There was a problem hiding this comment.
Remove hardcoded filesystem path.
The filesystem server configuration contains a hardcoded path /Users/kadxy/Desktop which will not work across different environments and could pose security risks.
Consider using environment variables or configuration parameters for the path:
- "/Users/kadxy/Desktop"
+ "${MCP_FILESYSTEM_PATH}"📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| "filesystem": { | |
| "command": "npx", | |
| "args": [ | |
| "-y", | |
| "@modelcontextprotocol/server-filesystem", | |
| "/Users/kadxy/Desktop" | |
| ] | |
| }, | |
| "filesystem": { | |
| "command": "npx", | |
| "args": [ | |
| "-y", | |
| "@modelcontextprotocol/server-filesystem", | |
| "${MCP_FILESYSTEM_PATH}" | |
| ] | |
| }, |
💻 变更类型 | Change Type
🔀 变更说明 | Description of Change
📝 补充信息 | Additional Information
Summary by CodeRabbit
Documentation
New Features
Chores
Configuration