fix(mcp): show auth URL when browser cannot open in remote sessions (#7884)

packages/opencode/src/cli/cmd/mcp.ts

@@ -13,6 +13,7 @@ import { Installation } from "../../installation"
 import path from "path"
 import { Global } from "../../global"
 import { modify, applyEdits } from "jsonc-parser"
+import { Bus } from "../../bus"
 
 function getAuthStatusIcon(status: MCP.AuthStatus): string {
   switch (status) {
@@ -227,6 +228,16 @@ export const McpAuthCommand = cmd({
         const spinner = prompts.spinner()
         spinner.start("Starting OAuth flow...")
 
+        // Subscribe to browser open failure events to show URL for manual opening
+        const unsubscribe = Bus.subscribe(MCP.BrowserOpenFailed, (evt) => {
+          if (evt.properties.mcpName === serverName) {
+            spinner.stop("Could not open browser automatically")
+            prompts.log.warn("Please open this URL in your browser to authenticate:")
+            prompts.log.info(evt.properties.url)
+            spinner.start("Waiting for authorization...")
+          }
+        })
+
         try {
           const status = await MCP.authenticate(serverName)
 
@@ -256,6 +267,8 @@ export const McpAuthCommand = cmd({
         } catch (error) {
           spinner.stop("Authentication failed", 1)
           prompts.log.error(error instanceof Error ? error.message : String(error))
+        } finally {
+          unsubscribe()
         }
 
         prompts.outro("Done")