fix(mcp): add no-op prompts/list and resources/list handlers

.changeset/ctx7-1604-prompts-resources-handlers.md

@@ -0,0 +1,5 @@
+---
+"@upstash/context7-mcp": patch
+---
+
+Advertise empty `prompts` and `resources` capabilities with no-op `prompts/list` and `resources/list` handlers. Some MCP clients (e.g. opencode) call these unconditionally and treat `-32601 Method not found` as a fatal connection error rather than honoring the negotiated capabilities, which previously prevented the server from loading.

packages/mcp/src/index.ts

@@ -2,6 +2,10 @@
 
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import {
+  ListPromptsRequestSchema,
+  ListResourcesRequestSchema,
+} from "@modelcontextprotocol/sdk/types.js";
 import { z } from "zod";
 import { searchLibraries, fetchLibraryContext } from "./lib/api.js";
 import { ClientContext } from "./lib/encryption.js";
@@ -316,6 +320,12 @@ Workflow: call first without researchMode. If that doesn't answer the question,
     }
   );
 
+  server.server.registerCapabilities({ prompts: {}, resources: {} });
+  server.server.setRequestHandler(ListPromptsRequestSchema, async () => ({ prompts: [] }));
+  server.server.setRequestHandler(ListResourcesRequestSchema, async () => ({
+    resources: [],
+  }));
+
   return server;
 }