Skip MCP era probe for Bailian-compatible connect.

Omit Client versionNegotiation so the SDK stays on legacy initialize; Bailian answers the 2026 server/discover probe with HTTP 500 and never reaches search.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/client.js

@@ -32,9 +32,12 @@ export async function callMcpSearch(server, key, args, signal) {
   }
 
   let runtime;
+  // Do not opt into MCP 2026 era negotiation. SDK default is legacy (plain
+  // 2025 initialize, no server/discover probe). Bailian/DashScope answers
+  // that probe with HTTP 500 and connect fails before any search call.
   const client = new Client(
-    { name: 'dsh-search-mcp', version: '0.2.41' },
-    { capabilities: {}, versionNegotiation: { mode: 'auto' } },
+    { name: 'dsh-search-mcp', version: '0.2.42' },
+    { capabilities: {} },
   );
   try {
     runtime = server.transport === 'stdio'

package.json

@@ -1,6 +1,6 @@
 {
   "name": "dsh-search-mcp",
-  "version": "0.2.41",
+  "version": "0.2.42",
   "description": "Replace dsh's built-in web search with search MCP servers (Tavily / Brave / Exa / Perplexity / DuckDuckGo / custom), configured from the web Settings page. When this plugin is enabled the built-in DeepSeek search provider is disabled.",
   "type": "module",
   "main": "lib/index.js",

test/compatibility.test.js

@@ -12,7 +12,7 @@ test('package exports resolve and peerDependencies stay open', async () => {
   assert.equal(pkg.exports['.'], './lib/index.js')
   assert.equal(pkg.exports['./client'], './lib/client.browser.js')
   assert.equal(pkg.engines.node, '>=20')
-  assert.equal(pkg.version, '0.2.41')
+  assert.equal(pkg.version, '0.2.42')
   assert.equal(pkg.dsh.client.immediately, false)
   assert.equal(pkg.dependencies['@modelcontextprotocol/client'], '2.0.0')
   assert.ok(!Object.hasOwn(pkg.dependencies, '@modelcontextprotocol/sdk'))
@@ -99,7 +99,10 @@ test('HTTP transport inherits DSH proxy with env fallback and pins DNS on direct
   assert.match(transport, /parseHttpEndpoint/)
   assert.match(transport, /validateHttpEndpoint\(server\.url, \{ signal \}\)/)
   assert.match(transport, /redirect: 'error'/)
-  assert.match(transport, /versionNegotiation:\s*\{\s*mode:\s*['"]auto['"]/)
+  // Bailian rejects the MCP 2026 era probe (HTTP 500); keep Client options
+  // at legacy default (capabilities only — no negotiation field).
+  assert.match(transport, /\{\s*capabilities:\s*\{\s*\}\s*\}/)
+  assert.doesNotMatch(transport, /mode:\s*['"]auto['"]/)
 })
 
 test('bundle inserts search-mcp without pinning web.searchProvider (Desktop 0.2 boot-safe)', async () => {