plugins/mcp: allow disabling/enabling similar to extensions

[connor4312]

Introduces an EnablementModel which is used to allow users to enable and disable both plugins and MCP at both a workspace and global level. Accessible on the mcp/plugins editors, inline within the marketplace view, and in the chat customizations view.

Closes #243620
Closes #300271

[Copilot]

Pull request overview

Adds a shared enablement model (profile + workspace scoped) so users can enable/disable agent plugins and MCP servers consistently across the workbench (editors, marketplace surfaces, and AI Customizations UI), and ensures disabled contributions don’t participate in discovery/tool registration.

Changes:

• Introduces a reusable EnablementModel persisted in profile/workspace storage and integrates it into agent plugins and MCP services.
• Updates MCP and plugin discovery/tool registration paths to skip disabled items and surfaces enable/disable actions in relevant UIs.
• Refactors AI Customizations list UIs with a shared group-header renderer and adds disabled styling/status messaging.

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/vs/workbench/contrib/mcp/test/common/testMcpService.ts	Adds a test enablement model stub to satisfy new IMcpService.enablementModel.
src/vs/workbench/contrib/mcp/test/common/mcpResourceFilesystem.test.ts	Updates McpService construction for new storage/enablement dependency.
src/vs/workbench/contrib/mcp/test/common/mcpGatewayToolBrokerChannel.test.ts	Extends MCP server test doubles with enablement observable.
src/vs/workbench/contrib/mcp/common/mcpTypes.ts	Extends MCP types to expose server enablement and service enablement model.
src/vs/workbench/contrib/mcp/common/mcpService.ts	Wires EnablementModel into MCP service and avoids autostart/tooling for disabled servers.
src/vs/workbench/contrib/mcp/common/mcpServer.ts	Adds enablement observable on McpServer derived from the enablement model.
src/vs/workbench/contrib/mcp/common/mcpLanguageModelToolContribution.ts	Skips registering tools from disabled MCP servers.
src/vs/workbench/contrib/mcp/common/discovery/pluginMcpDiscovery.ts	Skips MCP discovery contributions from disabled plugins.
src/vs/workbench/contrib/mcp/browser/mcpWorkbenchService.ts	Reacts to server enablement changes and surfaces disabled status messages.
src/vs/workbench/contrib/mcp/browser/mcpServerEditor.ts	Adds enable/disable dropdown actions to MCP server editor UI.
src/vs/workbench/contrib/mcp/browser/mcpServerActions.ts	Implements MCP enable/disable (global/workspace) actions and adds them to context menus.
src/vs/workbench/contrib/mcp/browser/mcpCommands.ts	Updates MCP quick pick to label disabled servers and open details instead of options when disabled.
src/vs/workbench/contrib/chat/test/common/promptSyntax/service/promptsService.test.ts	Updates plugin service stubs to the new enablement model shape.
src/vs/workbench/contrib/chat/test/common/promptSyntax/computeAutomaticInstructions.test.ts	Updates plugin service stubs to the new enablement model shape.
src/vs/workbench/contrib/chat/common/promptSyntax/service/promptsServiceImpl.ts	Filters plugin hooks/prompt contributions based on enablement state.
src/vs/workbench/contrib/chat/common/plugins/agentPluginServiceImpl.ts	Introduces plugin enablement model and rewires plugin discovery to use it.
src/vs/workbench/contrib/chat/common/plugins/agentPluginService.ts	Updates plugin interfaces to expose enablement state/model instead of boolean enabled.
src/vs/workbench/contrib/chat/common/enablement.ts	New shared profile/workspace enablement persistence model and helpers.
src/vs/workbench/contrib/chat/browser/enablementStatusWidget.ts	New reusable widget to display “disabled” status messages in editors.
src/vs/workbench/contrib/chat/browser/enablementActions.ts	New helper to build standard enable/disable action sets and context menu groups.
src/vs/workbench/contrib/chat/browser/aiCustomization/pluginListWidget.ts	Updates plugin list UI to reflect enablement states and reuse shared group header renderer.
src/vs/workbench/contrib/chat/browser/aiCustomization/media/aiCustomizationManagement.css	Adds disabled styling for list items/status badges.
src/vs/workbench/contrib/chat/browser/aiCustomization/mcpListWidget.ts	Updates MCP list UI to reflect disabled servers and reuse shared group header renderer.
src/vs/workbench/contrib/chat/browser/aiCustomization/customizationGroupHeaderRenderer.ts	New shared group header renderer used by MCP/plugin list widgets.
src/vs/workbench/contrib/chat/browser/agentPluginsView.ts	Updates agent plugins view to use new enablement-based actions and disabled styling.
src/vs/workbench/contrib/chat/browser/agentPluginEditor/agentPluginEditor.ts	Integrates enable/disable dropdowns and status widget into plugin editor.
src/vs/workbench/contrib/chat/browser/agentPluginActions.ts	New shared plugin actions (install/uninstall/open + enablement dropdown/context menu).
src/vs/sessions/contrib/sessions/test/browser/aiCustomizationShortcutsWidget.fixture.ts	Updates fixture for plugin service API changes.
src/vs/sessions/contrib/sessions/browser/customizationsToolbar.contribution.ts	Updates counts/observers to new plugin service API.
src/vs/sessions/contrib/sessions/browser/customizationCounts.ts	Updates plugin counts to new plugin service API.
src/vs/sessions/contrib/aiCustomizationTreeView/browser/aiCustomizationOverviewView.ts	Updates plugin counts to new plugin service API.

Comments suppressed due to low confidence (1)

src/vs/workbench/contrib/chat/common/plugins/agentPluginServiceImpl.ts:859

• Marketplace-installed plugins still have an enabled flag in IPluginMarketplaceService.installedPlugins, but discovery no longer uses it. This likely re-enables plugins that users previously disabled (and makes setInstalledPluginEnabled effectively dead code) unless there is a migration elsewhere. Consider seeding the new EnablementModel from entry.enabled (when no explicit enablement override exists yet) or continue gating discovery based on entry.enabled until the storage-based enablement fully replaces it.

		const installed = this._pluginMarketplaceService.installedPlugins.get();
		const sources: IPluginSource[] = [];

		for (const entry of installed) {
			let stat;
			try {
				stat = await this._fileService.resolve(entry.pluginUri);
			} catch {
				this._logService.debug(`[MarketplaceAgentPluginDiscovery] Could not resolve installed plugin: ${entry.pluginUri.toString()}`);
				continue;
			}

			if (!stat.isDirectory) {
				this._logService.debug(`[MarketplaceAgentPluginDiscovery] Installed plugin path is not a directory: ${entry.pluginUri.toString()}`);
				continue;
			}

			sources.push({
				uri: stat.resource,
				fromMarketplace: entry.plugin,
				remove: () => {

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