fix: allow experimental flags to override umbrella (#29273)

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

@@ -1,4 +1,4 @@
-import { Config, ConfigProvider, Context, Effect, Layer } from "effect"
+import { Config, ConfigProvider, Context, Effect, Layer, Option } from "effect"
 import { ConfigService } from "@/effect/config-service"
 
 const bool = (name: string) => Config.boolean(name).pipe(Config.withDefault(false))
@@ -9,7 +9,9 @@ const positiveInteger = (name: string) =>
   )
 const experimental = bool("OPENCODE_EXPERIMENTAL")
 const enabledByExperimental = (name: string) =>
-  Config.all({ experimental, enabled: bool(name) }).pipe(Config.map((flags) => flags.experimental || flags.enabled))
+  Config.all({ experimental, enabled: Config.boolean(name).pipe(Config.option) }).pipe(
+    Config.map((flags) => Option.getOrElse(flags.enabled, () => flags.experimental)),
+  )
 
 export class Service extends ConfigService.Service<Service>()("@opencode/RuntimeFlags", {
   autoShare: bool("OPENCODE_AUTO_SHARE"),

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

@@ -213,6 +213,21 @@ describe("RuntimeFlags", () => {
     }),
   )
 
+  it.effect("specific experimental flags override OPENCODE_EXPERIMENTAL", () =>
+    Effect.gen(function* () {
+      const flags = yield* readFlags.pipe(
+        Effect.provide(
+          fromConfig({
+            OPENCODE_EXPERIMENTAL: "true",
+            OPENCODE_EXPERIMENTAL_ICON_DISCOVERY: "false",
+          }),
+        ),
+      )
+
+      expect(flags.experimentalIconDiscovery).toBe(false)
+    }),
+  )
+
   it.effect("experimentalOxfmt defaults to false", () =>
     Effect.gen(function* () {
       const flags = yield* readFlags.pipe(Effect.provide(fromConfig({})))