feat(coding-agent): added disabledExtensions setting to filter skills

Fixes #413

packages/coding-agent/CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 
 ## [Unreleased]
+### Added
+
+- Added `disabledExtensions` setting to allow disabling specific extensions and skills by ID
+- Added support for filtering skills by disabled extension IDs with `skill:` prefix
 
 ## [13.12.1] - 2026-03-15
 ### Added

packages/coding-agent/src/config/settings-schema.ts

@@ -1574,6 +1574,7 @@ export interface SkillsSettings {
 	customDirectories?: string[];
 	ignoredSkills?: string[];
 	includeSkills?: string[];
+	disabledExtensions?: string[];
 }
 
 export interface CommitSettings {

packages/coding-agent/src/extensibility/skills.ts

@@ -83,6 +83,7 @@ export async function loadSkills(options: LoadSkillsOptions = {}): Promise<LoadS
 		customDirectories = [],
 		ignoredSkills = [],
 		includeSkills = [],
+		disabledExtensions = [],
 	} = options;
 
 	// Early return if skills are disabled
@@ -123,8 +124,12 @@ export async function loadSkills(options: LoadSkillsOptions = {}): Promise<LoadS
 		return ignoredSkills.some(pattern => new Bun.Glob(pattern).match(name));
 	}
 
+	const disabledSkillNames = new Set(
+		(disabledExtensions ?? []).filter(id => id.startsWith("skill:")).map(id => id.slice(6)),
+	);
 	// Filter skills by source and patterns first
 	const filteredSkills = result.items.filter(capSkill => {
+		if (disabledSkillNames.has(capSkill.name)) return false;
 		if (!isSourceEnabled(capSkill._source)) return false;
 		if (matchesIgnorePatterns(capSkill.name)) return false;
 		if (!matchesIncludePatterns(capSkill.name)) return false;

packages/coding-agent/src/sdk.ts

@@ -627,8 +627,11 @@ export async function createAgentSession(options: CreateAgentSessionOptions = {}
 		modelRegistry.refreshInBackground();
 	}
 	const skillsSettings = settings.getGroup("skills") as SkillsSettings;
+	const disabledExtensionIds = settings.get("disabledExtensions") ?? [];
 	const discoveredSkillsPromise =
-		options.skills === undefined ? discoverSkills(cwd, agentDir, skillsSettings) : undefined;
+		options.skills === undefined
+			? discoverSkills(cwd, agentDir, { ...skillsSettings, disabledExtensions: disabledExtensionIds })
+			: undefined;
 
 	// Initialize provider preferences from settings
 	const webSearchProvider = settings.get("providers.webSearch");
@@ -1006,12 +1009,14 @@ export async function createAgentSession(options: CreateAgentSessionOptions = {}
 			...(options.additionalExtensionPaths ?? []),
 			...((settings.get("extensions") as string[]) ?? []),
 		];
+		const disabledExtensionIds = settings.get("disabledExtensions") ?? [];
 		extensionsResult = await logger.timeAsync(
 			"discoverAndLoadExtensions",
 			discoverAndLoadExtensions,
 			configuredPaths,
 			cwd,
 			eventBus,
+			disabledExtensionIds,
 		);
 		for (const { path, error } of extensionsResult.errors) {
 			logger.error("Failed to load extension", { path, error });