Agents: enhance SSH and remote agent host management

[roblourens]

Brings the Agents app's SSH/remote-host management UX in line with the vscode-remote-ssh extension, and adds an inline manage-everything command. (Written by Copilot)

SSH host picker

Rewrites "Agents: Connect to Remote Agent Host via SSH" to mirror the remote-ssh "Connect to SSH" picker:

• Configured Host aliases from ~/.ssh/config (recursively expanding Include) listed at the top.
• Footer entries: + Add New SSH Host... and Configure SSH Hosts... (both also F1-able as their own commands).
• A dynamic synthetic ➤ user@host entry appears as soon as the typed value parses as a valid SSH connection string. Press Enter and we connect directly without ever creating a config entry.

The previous "Enter manually" item is gone — the synthetic entry replaces it.

New SSH commands

• Add New SSH Host... — ensures ~/.ssh exists (mode 0700), creates ~/.ssh/config if missing (mode 0600), opens it, and inserts a Host alias / HostName hostname / User user snippet via SnippetController2 with tabstops on each placeholder.
• Configure SSH Hosts... — calls a new ISSHRemoteAgentHostService.listSSHConfigFiles() (user config + /etc/ssh/ssh_config on POSIX or %ProgramData%\ssh\ssh_config on Windows when present), shows a quick pick (skipped when only one), and opens the chosen file. The user file is created on demand if picked and missing.

Workspace picker Manage submenu — inline X buttons

Non-tunnel remote entries now render an inline X (remove) button in the Manage submenu, same as recently-opened folders at the top level. Implemented by propagating onRemove from child IActions through ActionListWidget when building submenu items.

New "Manage Remote Agent Hosts..." command (F1)

A unified picker that shows the same set of items as the workspace picker's Manage submenu — connected remotes (with X buttons) plus the contributed Add/Manage actions. Picking a connected remote opens the per-remote actions popup (Reconnect / Remove / Copy address / Open Settings / Show Output). The actions popup logic was extracted into showRemoteHostOptions(accessor, provider) so it's shared between the workspace picker and the new command.

Internal cleanup

• Centralized command IDs in RemoteAgentHostCommandIds.
• Added listSSHConfigFiles() to ISSHRemoteAgentHostService + impls (node, electron-browser, browser-null) and test mocks.
• Wrapped the SSH picker's QuickPick and event subscriptions in a DisposableStore that disposes on onDidHide to avoid a leaked-disposable warning.

Verification

Verified live in the Agents window via the launch skill: SSH picker shows aliases + synthetic entry + footer items; Add New SSH Host opens ~/.ssh/config with active snippet tabstops; Configure SSH Hosts shows the file picker and opens the chosen file; Manage Remote Agent Hosts opens the unified picker.

[Copilot]

Pull request overview

Updates the Agents (sessions) remote-agent-host UX to better match VS Code Remote-SSH, adds SSH config management commands, and introduces a unified “Manage Remote Agent Hosts…” command that reuses the same per-remote actions UI across entry points.

Changes:

• Reworked the SSH connect flow to list ~/.ssh/config hosts, add footer actions, and allow direct [user@]host[:port] connect via a synthetic entry.
• Added SSH host/config management commands and a new ISSHRemoteAgentHostService.listSSHConfigFiles() API (plus implementations/mocks).
• Unified remote-host options UI via shared helpers and enabled inline “remove” (X) for non-tunnel remote entries by propagating onRemove through ActionListWidget submenus.

Show a summary per file

File	Description
src/vs/sessions/contrib/remoteAgentHost/browser/remoteHostOptions.ts	New shared helpers for remote status labels/hover and per-remote options quick pick.
src/vs/sessions/contrib/remoteAgentHost/browser/remoteAgentHostActions.ts	SSH picker rewrite + new SSH management commands + centralized command IDs.
src/vs/sessions/contrib/remoteAgentHost/browser/remoteAgentHost.contribution.ts	Registers the new “Manage Remote Agent Hosts…” action contribution.
src/vs/sessions/contrib/remoteAgentHost/browser/manageRemoteAgentHosts.ts	New unified management picker combining connected/known remotes with contributed actions.
src/vs/sessions/contrib/chat/browser/sessionWorkspacePicker.ts	Reuses shared remote-host options helpers and adds inline remove for non-tunnel remotes.
src/vs/sessions/contrib/chat/browser/scopedWorkspacePicker.ts	Constructor updated to match WorkspacePicker DI changes (instantiation service).
src/vs/platform/agentHost/test/electron-browser/sshRemoteAgentHostService.test.ts	Updates test mock to include new SSH config methods.
src/vs/platform/agentHost/test/electron-browser/sshRelayTransport.test.ts	Updates test mock to include new SSH config methods.
src/vs/platform/agentHost/node/sshRemoteAgentHostService.ts	Adds ensure/list SSH config file helpers in the node main service.
src/vs/platform/agentHost/electron-browser/sshRemoteAgentHostServiceImpl.ts	Exposes new SSH config methods via IPC proxy to the renderer service.
src/vs/platform/agentHost/common/sshRemoteAgentHost.ts	Extends SSH service interfaces with ensure/list SSH config file APIs.
src/vs/platform/agentHost/browser/nullSshRemoteAgentHostService.ts	Adds browser-null stubs for the new SSH config methods.
src/vs/platform/actionWidget/browser/actionList.ts	Propagates onRemove into submenu items to enable inline X buttons in submenus.

Copilot's findings

Comments suppressed due to low confidence (1)

src/vs/sessions/contrib/remoteAgentHost/browser/manageRemoteAgentHosts.ts:165

• When invoking menu-contributed actions, this uses commandService.executeCommand(selected.action.id) which drops any MenuItemAction arguments/options (options.args, options.arg, shouldForwardArgs) and can change behavior compared to how the same actions run from the menu/submenu. Prefer calling selected.action.run() (or otherwise preserve the action’s configured args) so the unified picker truly matches the Manage submenu behavior.

			if (selected.kind === 'remote') {
				// Defer to allow the picker to fully hide before opening options
				setTimeout(() => instantiationService.invokeFunction(a => showRemoteHostOptions(a, selected.provider)), 1);
			} else if (selected.kind === 'menu-action') {
				commandService.executeCommand(selected.action.id);
			}

• Files reviewed: 13/13 changed files
• Comments generated: 2