Evaluate SDK middleware for history/tracing #1024
Description
Context
TypeScript SDK PR #1406 adds message middleware support:
modelcontextprotocol/typescript-sdk#1406
This adds sendMiddleware and receiveMiddleware options to Protocol, allowing transformation of JSON-RPC messages before sending and after receiving.
Potential Uses in Inspector V2
| Use Case | How Middleware Helps |
|---|---|
| History capture | receiveMiddleware could capture all messages for History page without modifying client logic |
| Request tracing | sendMiddleware could inject trace IDs for parent-child correlation |
| Protocol extensions | Add custom capabilities to initialize (e.g., inspector metadata) |
| Plugin architecture | Plugins could register middleware to intercept/modify messages |
| Debugging | Inject timestamps, add debugging headers |
Action Items
- Monitor PR #1406 for merge
- When merged, evaluate integration into
McpContext.tsx - Consider for request trace model (linking tool calls to sampling requests)
- Evaluate for plugin hooks in client features PR
Related
- feat(client): add Mantine UI with MCP SDK integration #1022 (Mantine UI) - current McpContext uses direct SDK connection
- spec: Add client features UX patterns (sampling/elicitation) #1011 (client features UX spec) - request trace model spec
- Inspector V2 Data Spec #983 (data spec) - history/logging architecture