fix(opencode): respect MCP server capabilities (#31271)

packages/opencode/src/mcp/index.ts

@@ -204,7 +204,7 @@ function fetchFromClient<T extends { name: string }>(
   return Effect.tryPromise({
     try: () => listFn(client),
     catch: (e: any) => {
-      log.error(`failed to get ${label}`, { clientName, error: e.message })
+      log.warn(`failed to get ${label}`, { clientName, error: e.message })
       return e
     },
   }).pipe(
@@ -472,7 +472,7 @@ export const layer = Layer.effect(
         return { status } satisfies CreateResult
       }
 
-      const listed = yield* defs(key, mcpClient, mcp.timeout)
+      const listed = mcpClient.getServerCapabilities()?.tools ? yield* defs(key, mcpClient, mcp.timeout) : []
       if (!listed) {
         yield* Effect.tryPromise(() => mcpClient.close()).pipe(Effect.ignore)
         return { status: { status: "failed", error: "Failed to get tools" } } satisfies CreateResult
@@ -508,6 +508,7 @@ export const layer = Layer.effect(
     )
 
     function watch(s: State, name: string, client: MCPClient, bridge: EffectBridge.Shape, timeout?: number) {
+      if (!client.getServerCapabilities()?.tools) return
       client.setNotificationHandler(ToolListChangedNotificationSchema, async () => {
         log.info("tools list changed notification received", { server: name })
         if (s.clients[name] !== client || s.status[name]?.status !== "connected") return
@@ -718,12 +719,21 @@ export const layer = Layer.effect(
 
     const prompts = Effect.fn("MCP.prompts")(function* () {
       const s = yield* InstanceState.get(state)
-      return yield* collectFromConnected(s, (c) => c.listPrompts().then((r) => r.prompts), "prompts")
+      return yield* collectFromConnected(
+        s,
+        (c) => (c.getServerCapabilities()?.prompts ? c.listPrompts().then((r) => r.prompts) : Promise.resolve([])),
+        "prompts",
+      )
     })
 
     const resources = Effect.fn("MCP.resources")(function* () {
       const s = yield* InstanceState.get(state)
-      return yield* collectFromConnected(s, (c) => c.listResources().then((r) => r.resources), "resources")
+      return yield* collectFromConnected(
+        s,
+        (c) =>
+          c.getServerCapabilities()?.resources ? c.listResources().then((r) => r.resources) : Promise.resolve([]),
+        "resources",
+      )
     })
 
     const withClient = Effect.fnUntraced(function* <A>(
@@ -848,7 +858,11 @@ export const layer = Layer.effect(
           Effect.tapError(() => Effect.tryPromise(() => client?.close() ?? Promise.resolve()).pipe(Effect.ignore)),
         )
 
-        const listed = client ? yield* defs(mcpName, client, mcpConfig.timeout) : undefined
+        const listed = client
+          ? client.getServerCapabilities()?.tools
+            ? yield* defs(mcpName, client, mcpConfig.timeout)
+            : []
+          : undefined
         if (!client || !listed) {
           yield* Effect.tryPromise(() => client?.close() ?? Promise.resolve()).pipe(Effect.ignore)
           return { status: "failed", error: "Failed to get tools" } as Status