diff --git a/packages/opencode/src/cli/cmd/tui/plugin/internal.ts b/packages/opencode/src/cli/cmd/tui/plugin/internal.ts
index eaa9dfb320..5e0aec3ba1 100644
--- a/packages/opencode/src/cli/cmd/tui/plugin/internal.ts
+++ b/packages/opencode/src/cli/cmd/tui/plugin/internal.ts
@@ -11,7 +11,7 @@ import Notifications from "../feature-plugins/system/notifications"
 import SessionV2Debug from "../feature-plugins/system/session-v2"
 import WhichKey from "../feature-plugins/system/which-key"
 import type { TuiPlugin, TuiPluginModule } from "@opencode-ai/plugin/tui"
-import { Flag } from "@opencode-ai/core/flag/flag"
+import type { RuntimeFlags } from "@/effect/runtime-flags"
 
 export type InternalTuiPlugin = Omit<TuiPluginModule, "id"> & {
   id: string
@@ -19,17 +19,19 @@ export type InternalTuiPlugin = Omit<TuiPluginModule, "id"> & {
   enabled?: boolean
 }
 
-export const INTERNAL_TUI_PLUGINS: InternalTuiPlugin[] = [
-  HomeFooter,
-  HomeTips,
-  SidebarContext,
-  SidebarMcp,
-  SidebarLsp,
-  SidebarTodo,
-  SidebarFiles,
-  SidebarFooter,
-  Notifications,
-  PluginManager,
-  WhichKey,
-  ...(Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM ? [SessionV2Debug] : []),
-]
+export function internalTuiPlugins(flags: Pick<RuntimeFlags.Info, "experimentalEventSystem">): InternalTuiPlugin[] {
+  return [
+    HomeFooter,
+    HomeTips,
+    SidebarContext,
+    SidebarMcp,
+    SidebarLsp,
+    SidebarTodo,
+    SidebarFiles,
+    SidebarFooter,
+    Notifications,
+    PluginManager,
+    WhichKey,
+    ...(flags.experimentalEventSystem ? [SessionV2Debug] : []),
+  ]
+}
diff --git a/packages/opencode/src/cli/cmd/tui/plugin/runtime.ts b/packages/opencode/src/cli/cmd/tui/plugin/runtime.ts
index 4af16d2b8e..420826ad0c 100644
--- a/packages/opencode/src/cli/cmd/tui/plugin/runtime.ts
+++ b/packages/opencode/src/cli/cmd/tui/plugin/runtime.ts
@@ -35,11 +35,13 @@ import { Filesystem } from "@/util/filesystem"
 import { Process } from "@/util/process"
 import { Flock } from "@opencode-ai/core/util/flock"
 import { Flag } from "@opencode-ai/core/flag/flag"
-import { INTERNAL_TUI_PLUGINS, type InternalTuiPlugin } from "./internal"
+import { internalTuiPlugins, type InternalTuiPlugin } from "./internal"
 import { setupSlots, Slot as View } from "./slots"
 import type { HostPluginApi, HostSlots } from "./slots"
 import { ConfigPlugin } from "@/config/plugin"
 import { createCommandShim } from "./command-shim"
+import { RuntimeFlags } from "@/effect/runtime-flags"
+import { Effect } from "effect"
 
 ensureRuntimePluginSupport({ additional: keymapRuntimeModules })
 
@@ -1070,7 +1072,10 @@ async function load(input: { api: Api; config: TuiConfig.Resolved; dispose?: ()
       log.info("skipping external tui plugins in pure mode", { count: config.plugin_origins.length })
     }
 
-    for (const item of INTERNAL_TUI_PLUGINS) {
+    const flags = await Effect.runPromise(
+      RuntimeFlags.Service.use((flags) => Effect.succeed(flags)).pipe(Effect.provide(RuntimeFlags.defaultLayer)),
+    )
+    for (const item of internalTuiPlugins(flags)) {
       log.info("loading internal tui plugin", { id: item.id })
       const entry = loadInternalPlugin(item)
       const meta = createMeta(entry.source, entry.spec, entry.target, undefined, entry.id)
diff --git a/packages/opencode/src/effect/runtime-flags.ts b/packages/opencode/src/effect/runtime-flags.ts
index 3dfb2e99f4..b1b8ab25ac 100644
--- a/packages/opencode/src/effect/runtime-flags.ts
+++ b/packages/opencode/src/effect/runtime-flags.ts
@@ -22,6 +22,7 @@ export class Service extends ConfigService.Service<Service>()("@opencode/Runtime
   experimentalScout: enabledByExperimental("OPENCODE_EXPERIMENTAL_SCOUT"),
   experimentalLspTool: enabledByExperimental("OPENCODE_EXPERIMENTAL_LSP_TOOL"),
   experimentalPlanMode: enabledByExperimental("OPENCODE_EXPERIMENTAL_PLAN_MODE"),
+  experimentalEventSystem: enabledByExperimental("OPENCODE_EXPERIMENTAL_EVENT_SYSTEM"),
   client: Config.string("OPENCODE_CLIENT").pipe(Config.withDefault("cli")),
 }) {}
 
diff --git a/packages/opencode/src/session/compaction.ts b/packages/opencode/src/session/compaction.ts
index f3c160fe73..3340e0fbe9 100644
--- a/packages/opencode/src/session/compaction.ts
+++ b/packages/opencode/src/session/compaction.ts
@@ -18,9 +18,9 @@ import { InstanceState } from "@/effect/instance-state"
 import { isOverflow as overflow, usable } from "./overflow"
 import { makeRuntime } from "@/effect/run-service"
 import { serviceUse } from "@/effect/service-use"
+import { RuntimeFlags } from "@/effect/runtime-flags"
 import { SyncEvent } from "@/sync"
 import { SessionEvent } from "@/v2/session-event"
-import { Flag } from "@opencode-ai/core/flag/flag"
 
 const log = Log.create({ service: "session.compaction" })
 
@@ -221,6 +221,7 @@ export const layer: Layer.Layer<
   | SessionProcessor.Service
   | Provider.Service
   | SyncEvent.Service
+  | RuntimeFlags.Service
 > = Layer.effect(
   Service,
   Effect.gen(function* () {
@@ -232,6 +233,7 @@ export const layer: Layer.Layer<
     const processors = yield* SessionProcessor.Service
     const provider = yield* Provider.Service
     const sync = yield* SyncEvent.Service
+    const flags = yield* RuntimeFlags.Service
 
     const isOverflow = Effect.fn("SessionCompaction.isOverflow")(function* (input: {
       tokens: MessageV2.Assistant["tokens"]
@@ -572,7 +574,7 @@ export const layer: Layer.Layer<
             parts: [],
           },
         )
-        if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+        if (flags.experimentalEventSystem) {
           yield* sync.run(SessionEvent.Compaction.Ended.Sync, {
             sessionID: input.sessionID,
             timestamp: DateTime.makeUnsafe(Date.now()),
@@ -608,7 +610,7 @@ export const layer: Layer.Layer<
         auto: input.auto,
         overflow: input.overflow,
       })
-      if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+      if (flags.experimentalEventSystem) {
         yield* sync.run(SessionEvent.Compaction.Started.Sync, {
           sessionID: input.sessionID,
           timestamp: DateTime.makeUnsafe(Date.now()),
@@ -636,6 +638,7 @@ export const defaultLayer = Layer.suspend(() =>
     Layer.provide(Bus.layer),
     Layer.provide(Config.defaultLayer),
     Layer.provide(SyncEvent.defaultLayer),
+    Layer.provide(RuntimeFlags.defaultLayer),
   ),
 )
 
diff --git a/packages/opencode/src/session/processor.ts b/packages/opencode/src/session/processor.ts
index 506ec0c402..c731239b62 100644
--- a/packages/opencode/src/session/processor.ts
+++ b/packages/opencode/src/session/processor.ts
@@ -25,7 +25,7 @@ import { SyncEvent } from "@/sync"
 import { SessionEvent } from "@/v2/session-event"
 import { Modelv2 } from "@/v2/model"
 import * as DateTime from "effect/DateTime"
-import { Flag } from "@opencode-ai/core/flag/flag"
+import { RuntimeFlags } from "@/effect/runtime-flags"
 
 const DOOM_LOOP_THRESHOLD = 3
 const log = Log.create({ service: "session.processor" })
@@ -98,6 +98,7 @@ export const layer: Layer.Layer<
   | SessionSummary.Service
   | SessionStatus.Service
   | SyncEvent.Service
+  | RuntimeFlags.Service
 > = Layer.effect(
   Service,
   Effect.gen(function* () {
@@ -114,6 +115,7 @@ export const layer: Layer.Layer<
     const status = yield* SessionStatus.Service
     const image = yield* Image.Service
     const sync = yield* SyncEvent.Service
+    const flags = yield* RuntimeFlags.Service
 
     const create = Effect.fn("SessionProcessor.create")(function* (input: Input) {
       // Pre-capture snapshot before the LLM stream starts. The AI SDK
@@ -232,7 +234,7 @@ export const layer: Layer.Layer<
           case "reasoning-start":
             if (value.id in ctx.reasoningMap) return
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Reasoning.Started.Sync, {
                 sessionID: ctx.sessionID,
                 reasoningID: value.id,
@@ -267,7 +269,7 @@ export const layer: Layer.Layer<
           case "reasoning-end":
             if (!(value.id in ctx.reasoningMap)) return
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Reasoning.Ended.Sync, {
                 sessionID: ctx.sessionID,
                 reasoningID: value.id,
@@ -288,7 +290,7 @@ export const layer: Layer.Layer<
               throw new Error(`Tool call not allowed while generating summary: ${value.toolName}`)
             }
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Tool.Input.Started.Sync, {
                 sessionID: ctx.sessionID,
                 callID: value.id,
@@ -319,7 +321,7 @@ export const layer: Layer.Layer<
 
           case "tool-input-end": {
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Tool.Input.Ended.Sync, {
                 sessionID: ctx.sessionID,
                 callID: value.id,
@@ -336,7 +338,7 @@ export const layer: Layer.Layer<
             }
             const toolCall = yield* readToolCall(value.toolCallId)
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Tool.Called.Sync, {
                 sessionID: ctx.sessionID,
                 callID: value.toolCallId,
@@ -422,7 +424,7 @@ export const layer: Layer.Layer<
               attachments: attachments?.length ? attachments : undefined,
             }
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Tool.Success.Sync, {
                 sessionID: ctx.sessionID,
                 callID: value.toolCallId,
@@ -452,7 +454,7 @@ export const layer: Layer.Layer<
           case "tool-error": {
             const toolCall = yield* readToolCall(value.toolCallId)
             // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Tool.Failed.Sync, {
                 sessionID: ctx.sessionID,
                 callID: value.toolCallId,
@@ -477,7 +479,7 @@ export const layer: Layer.Layer<
             if (!ctx.snapshot) ctx.snapshot = yield* snapshot.track()
             if (!ctx.assistantMessage.summary) {
               // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-              if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+              if (flags.experimentalEventSystem) {
                 yield* sync.run(SessionEvent.Step.Started.Sync, {
                   sessionID: ctx.sessionID,
                   agent: input.assistantMessage.agent,
@@ -509,7 +511,7 @@ export const layer: Layer.Layer<
             })
             if (!ctx.assistantMessage.summary) {
               // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-              if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+              if (flags.experimentalEventSystem) {
                 yield* sync.run(SessionEvent.Step.Ended.Sync, {
                   sessionID: ctx.sessionID,
                   finish: value.finishReason,
@@ -566,7 +568,7 @@ export const layer: Layer.Layer<
           case "text-start":
             if (!ctx.assistantMessage.summary) {
               // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-              if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+              if (flags.experimentalEventSystem) {
                 yield* sync.run(SessionEvent.Text.Started.Sync, {
                   sessionID: ctx.sessionID,
                   timestamp: DateTime.makeUnsafe(Date.now()),
@@ -613,7 +615,7 @@ export const layer: Layer.Layer<
             )).text
             if (!ctx.assistantMessage.summary) {
               // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-              if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+              if (flags.experimentalEventSystem) {
                 yield* sync.run(SessionEvent.Text.Ended.Sync, {
                   sessionID: ctx.sessionID,
                   text: ctx.currentText.text,
@@ -709,7 +711,7 @@ export const layer: Layer.Layer<
         }
         if (!ctx.assistantMessage.summary) {
           // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-          if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+          if (flags.experimentalEventSystem) {
             yield* sync.run(SessionEvent.Step.Failed.Sync, {
               sessionID: ctx.sessionID,
               error: {
@@ -763,7 +765,7 @@ export const layer: Layer.Layer<
                 parse,
                 set: (info) => {
                   // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-                  const event = Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM
+                  const event = flags.experimentalEventSystem
                     ? sync.run(SessionEvent.Retried.Sync, {
                         sessionID: ctx.sessionID,
                         attempt: info.attempt,
@@ -826,6 +828,7 @@ export const defaultLayer = Layer.suspend(() =>
     Layer.provide(Bus.layer),
     Layer.provide(Config.defaultLayer),
     Layer.provide(SyncEvent.defaultLayer),
+    Layer.provide(RuntimeFlags.defaultLayer),
   ),
 )
 
diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index 3b1f2c41ae..cae0dd3845 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -23,7 +23,6 @@ import { ToolRegistry } from "@/tool/registry"
 import { ToolJsonSchema } from "@/tool/json-schema"
 import { MCP } from "../mcp"
 import { LSP } from "@/lsp/lsp"
-import { Flag } from "@opencode-ai/core/flag/flag"
 import { ulid } from "ulid"
 import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"
 import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
@@ -957,7 +956,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
               },
             }
             yield* sessions.updatePart(part)
-            if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+            if (flags.experimentalEventSystem) {
               yield* sync.run(SessionEvent.Shell.Started.Sync, {
                 sessionID: input.sessionID,
                 timestamp: DateTime.makeUnsafe(started),
@@ -980,7 +979,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
                 output += "\n\n" + ["<metadata>", "User aborted the command", "</metadata>"].join("\n")
               }
               const completed = Date.now()
-              if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+              if (flags.experimentalEventSystem) {
                 yield* sync.run(SessionEvent.Shell.Ended.Sync, {
                   sessionID: input.sessionID,
                   timestamp: DateTime.makeUnsafe(completed),
@@ -1571,7 +1570,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
         },
       )
       // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-      if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+      if (flags.experimentalEventSystem) {
         yield* sync.run(SessionEvent.Prompted.Sync, {
           sessionID: input.sessionID,
           timestamp: DateTime.makeUnsafe(info.time.created),
@@ -1585,7 +1584,7 @@ NOTE: At any point in time through this workflow you should feel free to ask the
       }
       for (const text of nextPrompt.synthetic) {
         // TODO(v2): Temporary dual-write while migrating session messages to v2 events.
-        if (Flag.OPENCODE_EXPERIMENTAL_EVENT_SYSTEM) {
+        if (flags.experimentalEventSystem) {
           yield* sync.run(SessionEvent.Synthetic.Sync, {
             sessionID: input.sessionID,
             timestamp: DateTime.makeUnsafe(info.time.created),
diff --git a/packages/opencode/test/effect/runtime-flags.test.ts b/packages/opencode/test/effect/runtime-flags.test.ts
index 058fa7559a..c213990172 100644
--- a/packages/opencode/test/effect/runtime-flags.test.ts
+++ b/packages/opencode/test/effect/runtime-flags.test.ts
@@ -33,6 +33,7 @@ describe("RuntimeFlags", () => {
       expect(flags.experimentalScout).toBe(true)
       expect(flags.experimentalLspTool).toBe(true)
       expect(flags.experimentalPlanMode).toBe(true)
+      expect(flags.experimentalEventSystem).toBe(true)
       expect(flags.client).toBe("desktop")
     }),
   )
diff --git a/packages/opencode/test/session/compaction.test.ts b/packages/opencode/test/session/compaction.test.ts
index 2b623511b7..d8a4167902 100644
--- a/packages/opencode/test/session/compaction.test.ts
+++ b/packages/opencode/test/session/compaction.test.ts
@@ -28,6 +28,7 @@ import { testEffect } from "../lib/effect"
 import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
 import { TestConfig } from "../fixture/config"
 import { SyncEvent } from "@/sync"
+import { RuntimeFlags } from "@/effect/runtime-flags"
 
 void Log.init({ print: false })
 
@@ -225,6 +226,7 @@ const deps = Layer.mergeAll(
   Bus.layer,
   Config.defaultLayer,
   SyncEvent.defaultLayer,
+  RuntimeFlags.layer({ experimentalEventSystem: true }),
 )
 
 const env = Layer.mergeAll(
@@ -257,6 +259,7 @@ function compactionProcessLayer(options?: CompactionProcessOptions) {
     ? SessionProcessorModule.SessionProcessor.layer.pipe(
         Layer.provide(summary),
         Layer.provide(Image.defaultLayer),
+        Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
         Layer.provide(status),
       )
     : layer(options?.result ?? "continue")
@@ -272,6 +275,7 @@ function compactionProcessLayer(options?: CompactionProcessOptions) {
     Layer.provide(bus),
     Layer.provide(options?.config ?? Config.defaultLayer),
     Layer.provide(SyncEvent.defaultLayer),
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
   )
 }
 
diff --git a/packages/opencode/test/session/processor-effect.test.ts b/packages/opencode/test/session/processor-effect.test.ts
index fc5e73877d..537665b9a5 100644
--- a/packages/opencode/test/session/processor-effect.test.ts
+++ b/packages/opencode/test/session/processor-effect.test.ts
@@ -25,6 +25,7 @@ import { provideTmpdirServer } from "../fixture/fixture"
 import { testEffect } from "../lib/effect"
 import { raw, reply, TestLLMServer } from "../lib/llm-server"
 import { SyncEvent } from "@/sync"
+import { RuntimeFlags } from "@/effect/runtime-flags"
 
 void Log.init({ print: false })
 
@@ -171,7 +172,12 @@ const deps = Layer.mergeAll(
 ).pipe(Layer.provideMerge(infra))
 const env = Layer.mergeAll(
   TestLLMServer.layer,
-  SessionProcessor.layer.pipe(Layer.provide(summary), Layer.provide(Image.defaultLayer), Layer.provideMerge(deps)),
+  SessionProcessor.layer.pipe(
+    Layer.provide(summary),
+    Layer.provide(Image.defaultLayer),
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
+    Layer.provideMerge(deps),
+  ),
 )
 
 const it = testEffect(env)
diff --git a/packages/opencode/test/session/prompt.test.ts b/packages/opencode/test/session/prompt.test.ts
index de548c9263..c3d113d52f 100644
--- a/packages/opencode/test/session/prompt.test.ts
+++ b/packages/opencode/test/session/prompt.test.ts
@@ -180,7 +180,7 @@ function makeHttp() {
     Layer.provide(Reference.defaultLayer),
     Layer.provide(Ripgrep.defaultLayer),
     Layer.provide(Format.defaultLayer),
-    Layer.provide(RuntimeFlags.layer()),
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
     Layer.provideMerge(todo),
     Layer.provideMerge(question),
     Layer.provideMerge(deps),
@@ -189,9 +189,14 @@ function makeHttp() {
   const proc = SessionProcessor.layer.pipe(
     Layer.provide(summary),
     Layer.provide(Image.defaultLayer),
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
+    Layer.provideMerge(deps),
+  )
+  const compact = SessionCompaction.layer.pipe(
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
+    Layer.provideMerge(proc),
     Layer.provideMerge(deps),
   )
-  const compact = SessionCompaction.layer.pipe(Layer.provideMerge(proc), Layer.provideMerge(deps))
   return Layer.mergeAll(
     TestLLMServer.layer,
     SessionPrompt.layer.pipe(
@@ -206,7 +211,7 @@ function makeHttp() {
       Layer.provideMerge(trunc),
       Layer.provide(Instruction.defaultLayer),
       Layer.provide(SystemPrompt.defaultLayer),
-      Layer.provide(RuntimeFlags.layer()),
+      Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
       Layer.provideMerge(deps),
     ),
   ).pipe(Layer.provide(summary))
diff --git a/packages/opencode/test/session/snapshot-tool-race.test.ts b/packages/opencode/test/session/snapshot-tool-race.test.ts
index 49632a8298..28565699bc 100644
--- a/packages/opencode/test/session/snapshot-tool-race.test.ts
+++ b/packages/opencode/test/session/snapshot-tool-race.test.ts
@@ -138,7 +138,7 @@ function makeHttp() {
     Layer.provide(Reference.defaultLayer),
     Layer.provide(Ripgrep.defaultLayer),
     Layer.provide(Format.defaultLayer),
-    Layer.provide(RuntimeFlags.layer()),
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
     Layer.provideMerge(todo),
     Layer.provideMerge(question),
     Layer.provideMerge(deps),
@@ -147,9 +147,14 @@ function makeHttp() {
   const proc = SessionProcessor.layer.pipe(
     Layer.provide(SessionSummary.defaultLayer),
     Layer.provide(Image.defaultLayer),
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
+    Layer.provideMerge(deps),
+  )
+  const compact = SessionCompaction.layer.pipe(
+    Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
+    Layer.provideMerge(proc),
     Layer.provideMerge(deps),
   )
-  const compact = SessionCompaction.layer.pipe(Layer.provideMerge(proc), Layer.provideMerge(deps))
   return Layer.mergeAll(
     TestLLMServer.layer,
     SessionSummary.defaultLayer,
@@ -165,7 +170,7 @@ function makeHttp() {
       Layer.provideMerge(trunc),
       Layer.provide(Instruction.defaultLayer),
       Layer.provide(SystemPrompt.defaultLayer),
-      Layer.provide(RuntimeFlags.layer()),
+      Layer.provide(RuntimeFlags.layer({ experimentalEventSystem: true })),
       Layer.provideMerge(deps),
     ),
   )