refactor(flags): migrate external skills flag (#27685)

packages/opencode/src/effect/runtime-flags.ts

@@ -17,6 +17,7 @@ export class Service extends ConfigService.Service<Service>()("@opencode/Runtime
   disableDefaultPlugins: bool("OPENCODE_DISABLE_DEFAULT_PLUGINS"),
   disableChannelDb: bool("OPENCODE_DISABLE_CHANNEL_DB"),
   disableEmbeddedWebUi: bool("OPENCODE_DISABLE_EMBEDDED_WEB_UI"),
+  disableExternalSkills: bool("OPENCODE_DISABLE_EXTERNAL_SKILLS"),
   disableClaudeCodeSkills: Config.all({
     broad: bool("OPENCODE_DISABLE_CLAUDE_CODE"),
     direct: bool("OPENCODE_DISABLE_CLAUDE_CODE_SKILLS"),

packages/opencode/src/skill/index.ts

@@ -5,7 +5,6 @@ import { NamedError } from "@opencode-ai/core/util/error"
 import type { Agent } from "@/agent/agent"
 import { Bus } from "@/bus"
 import { InstanceState } from "@/effect/instance-state"
-import { Flag } from "@opencode-ai/core/flag/flag"
 import { Global } from "@opencode-ai/core/global"
 import { Permission } from "@/permission"
 import { AppFileSystem } from "@opencode-ai/core/filesystem"
@@ -166,6 +165,7 @@ const discoverSkills = Effect.fnUntraced(function* (
   discovery: Discovery.Interface,
   fsys: AppFileSystem.Interface,
   global: Global.Interface,
+  disableExternalSkills: boolean,
   disableClaudeCodeSkills: boolean,
   directory: string,
   worktree: string,
@@ -173,7 +173,7 @@ const discoverSkills = Effect.fnUntraced(function* (
   const state: ScanState = { matches: new Set(), dirs: new Set() }
 
   const externalDirs: string[] = []
-  if (!Flag.OPENCODE_DISABLE_EXTERNAL_SKILLS) {
+  if (!disableExternalSkills) {
     if (!disableClaudeCodeSkills) externalDirs.push(CLAUDE_EXTERNAL_DIR)
     externalDirs.push(AGENTS_EXTERNAL_DIR)
 
@@ -249,6 +249,7 @@ export const layer = Layer.effect(
           discovery,
           fsys,
           global,
+          flags.disableExternalSkills,
           flags.disableClaudeCodeSkills,
           ctx.directory,
           ctx.worktree,