diff --git a/denops/skkeleton/config.ts b/denops/skkeleton/config.ts
index 905274e7..48805635 100644
--- a/denops/skkeleton/config.ts
+++ b/denops/skkeleton/config.ts
@@ -1,5 +1,5 @@
 import { Denops } from "./deps.ts";
-import { ensure, is } from "./deps/unknownutil.ts";
+import { is, u } from "./deps/unknownutil.ts";
 import { getKanaTable, loadKanaTableFiles } from "./kana.ts";
 import { ConfigOptions, Encode, Encoding } from "./types.ts";
 import { homeExpand } from "./util.ts";
@@ -47,11 +47,11 @@ function ensureEncoding(x: unknown): Encoding {
 }
 
 const validators: Validators = {
-  acceptIllegalResult: (x) => ensure(x, is.Boolean),
-  completionRankFile: (x) => ensure(x, is.String),
-  databasePath: (x) => ensure(x, is.String),
-  debug: (x) => ensure(x, is.Boolean),
-  eggLikeNewline: (x) => ensure(x, is.Boolean),
+  acceptIllegalResult: (x) => u.ensure(x, is.Boolean),
+  completionRankFile: (x) => u.ensure(x, is.String),
+  databasePath: (x) => u.ensure(x, is.String),
+  debug: (x) => u.ensure(x, is.Boolean),
+  eggLikeNewline: (x) => u.ensure(x, is.Boolean),
   globalDictionaries: (x): (string | [string, string])[] => {
     if (
       !is.ArrayOf(
@@ -74,11 +74,11 @@ const validators: Validators = {
     }
     return x;
   },
-  immediatelyCancel: (x) => ensure(x, is.Boolean),
-  immediatelyDictionaryRW: (x) => ensure(x, is.Boolean),
-  immediatelyOkuriConvert: (x) => ensure(x, is.Boolean),
+  immediatelyCancel: (x) => u.ensure(x, is.Boolean),
+  immediatelyDictionaryRW: (x) => u.ensure(x, is.Boolean),
+  immediatelyOkuriConvert: (x) => u.ensure(x, is.Boolean),
   kanaTable: (x): string => {
-    const name = ensure(x, is.String);
+    const name = u.ensure(x, is.String);
     try {
       getKanaTable(name);
     } catch {
@@ -86,33 +86,33 @@ const validators: Validators = {
     }
     return name;
   },
-  keepMode: (x) => ensure(x, is.Boolean),
-  keepState: (x) => ensure(x, is.Boolean),
-  markerHenkan: (x) => ensure(x, is.String),
-  markerHenkanSelect: (x) => ensure(x, is.String),
-  registerConvertResult: (x) => ensure(x, is.Boolean),
+  keepMode: (x) => u.ensure(x, is.Boolean),
+  keepState: (x) => u.ensure(x, is.Boolean),
+  markerHenkan: (x) => u.ensure(x, is.String),
+  markerHenkanSelect: (x) => u.ensure(x, is.String),
+  registerConvertResult: (x) => u.ensure(x, is.Boolean),
   selectCandidateKeys: (x) => {
-    const keys = ensure(x, is.String);
+    const keys = u.ensure(x, is.String);
     if (keys.length !== 7) {
       throw TypeError("selectCandidateKeys.length !== 7");
     }
     return keys;
   },
-  setUndoPoint: (x) => ensure(x, is.Boolean),
-  showCandidatesCount: (x) => ensure(x, is.Number),
-  skkServerHost: (x) => ensure(x, is.String),
-  skkServerPort: (x) => ensure(x, is.Number),
+  setUndoPoint: (x) => u.ensure(x, is.Boolean),
+  showCandidatesCount: (x) => u.ensure(x, is.Number),
+  skkServerHost: (x) => u.ensure(x, is.String),
+  skkServerPort: (x) => u.ensure(x, is.Number),
   skkServerReqEnc: ensureEncoding,
   skkServerResEnc: ensureEncoding,
-  sources: (x) => ensure(x, is.ArrayOf(is.String)),
+  sources: (x) => u.ensure(x, is.ArrayOf(is.String)),
   useGoogleJapaneseInput: () => {
     throw '`useGoogleJapaneseInput` is removed. Please use `sources` with "google_japanese_input"';
   },
-  usePopup: (x) => ensure(x, is.Boolean),
+  usePopup: (x) => u.ensure(x, is.Boolean),
   useSkkServer: () => {
     throw '`useSkkServer` is removed. Please use `sources` with "skk_server"';
   },
-  userDictionary: (x) => ensure(x, is.String),
+  userDictionary: (x) => u.ensure(x, is.String),
 };
 
 async function normalize(
diff --git a/denops/skkeleton/deps/unknownutil.ts b/denops/skkeleton/deps/unknownutil.ts
index 11ca144d..5ee94fbf 100644
--- a/denops/skkeleton/deps/unknownutil.ts
+++ b/denops/skkeleton/deps/unknownutil.ts
@@ -1 +1,2 @@
-export * from "https://deno.land/x/unknownutil@v3.16.0/mod.ts";
+export * as u from "https://deno.land/x/unknownutil@v3.16.0/mod.ts";
+export { is } from "https://deno.land/x/unknownutil@v3.16.0/mod.ts";
diff --git a/denops/skkeleton/kana.ts b/denops/skkeleton/kana.ts
index 2c284ec1..7e8679f3 100644
--- a/denops/skkeleton/kana.ts
+++ b/denops/skkeleton/kana.ts
@@ -1,6 +1,6 @@
 import { config } from "./config.ts";
 import { distinctBy } from "./deps/std/collections.ts";
-import { assert, is } from "./deps/unknownutil.ts";
+import { is, u } from "./deps/unknownutil.ts";
 import { functions } from "./function.ts";
 import { romToHira } from "./kana/rom_hira.ts";
 import { romToZen } from "./kana/rom_zen.ts";
@@ -48,7 +48,7 @@ export function registerKanaTable(
     console.log("skkeleton: new kana table");
     console.log(`name: ${name}, table: ${Deno.inspect(rawTable)}`);
   }
-  assert(rawTable, is.Record);
+  u.assert(rawTable, is.Record);
   const table: KanaTable = Object.entries(rawTable).map((
     e,
   ) => [e[0], asKanaResult(e[1])]);
diff --git a/denops/skkeleton/main.ts b/denops/skkeleton/main.ts
index d667c82f..85939abc 100644
--- a/denops/skkeleton/main.ts
+++ b/denops/skkeleton/main.ts
@@ -1,6 +1,6 @@
 import { config, setConfig } from "./config.ts";
 import { autocmd, Denops, fn, op, vars } from "./deps.ts";
-import { assert, AssertError, is } from "./deps/unknownutil.ts";
+import { is, u } from "./deps/unknownutil.ts";
 import { functions, modeFunctions } from "./function.ts";
 import { disable as disableFunc } from "./function/disable.ts";
 import { load as loadDictionary } from "./dictionary.ts";
@@ -45,7 +45,7 @@ function isOpts(x: any): x is Opts {
 
 function assertOpts(x: unknown): asserts x is Opts {
   if (!isOpts(x)) {
-    throw new AssertError("value must be Opts");
+    throw new u.AssertError("value must be Opts");
   }
 }
 
@@ -262,18 +262,18 @@ export async function main(denops: Denops) {
   }
   denops.dispatcher = {
     async config(config: unknown) {
-      assert(config, is.Record);
+      u.assert(config, is.Record);
       await setConfig(config, denops);
       return;
     },
     async registerKeyMap(state: unknown, key: unknown, funcName: unknown) {
-      assert(state, is.String);
-      assert(key, is.String);
+      u.assert(state, is.String);
+      u.assert(key, is.String);
       await receiveNotation(denops);
       registerKeyMap(state, key, funcName);
     },
     registerKanaTable(tableName: unknown, table: unknown, create: unknown) {
-      assert(tableName, is.String);
+      u.assert(tableName, is.String);
       registerKanaTable(tableName, table, !!create);
       return Promise.resolve();
     },
@@ -285,6 +285,8 @@ export async function main(denops: Denops) {
       await init(denops);
       if (func === "handleKey") {
         return buildResult(await handle(opts, vimStatus));
+      } else if (func === "setState") {
+        return buildResult(await enable(opts, vimStatus));
       } else if (func === "enable") {
         return buildResult(await enable(opts, vimStatus));
       } else if (func === "disable") {
@@ -337,8 +339,8 @@ export async function main(denops: Denops) {
       await denops.dispatcher.completeCallback(kana, word);
     },
     async completeCallback(kana: unknown, word: unknown) {
-      assert(kana, is.String);
-      assert(word, is.String);
+      u.assert(kana, is.String);
+      u.assert(word, is.String);
       const lib = await currentLibrary.get();
       await lib.registerHenkanResult("okurinasi", kana, word);
       const context = currentContext.get();
@@ -362,9 +364,9 @@ export async function main(denops: Denops) {
       await currentLibrary.get();
     },
     async updateDatabase(path: unknown, encoding: unknown, force: unknown) {
-      assert(path, is.String);
-      assert(encoding, is.String);
-      assert(force, is.Boolean);
+      u.assert(path, is.String);
+      u.assert(encoding, is.String);
+      u.assert(force, is.Boolean);
       await DenoKvDictionary.create(path, encoding)
         .then((dict) => dict.load(force));
       await denops.cmd(`echomsg 'updated database: "${path}"'`);
diff --git a/denops/skkeleton/notation.ts b/denops/skkeleton/notation.ts
index 1b8f0e04..3d9d28b5 100644
--- a/denops/skkeleton/notation.ts
+++ b/denops/skkeleton/notation.ts
@@ -1,5 +1,5 @@
 import type { Denops } from "./deps.ts";
-import { assert, is } from "./deps/unknownutil.ts";
+import { is, u } from "./deps/unknownutil.ts";
 
 let received = false;
 export let notationToKey: Record<string, string> = {};
@@ -10,10 +10,10 @@ export async function receiveNotation(denops: Denops) {
     return;
   }
   const n2k = await denops.eval("g:skkeleton#notation#notation_to_key");
-  assert(n2k, is.RecordOf(is.String));
+  u.assert(n2k, is.RecordOf(is.String));
   notationToKey = n2k;
   const k2n = await denops.eval("g:skkeleton#notation#key_to_notation");
-  assert(k2n, is.RecordOf(is.String));
+  u.assert(k2n, is.RecordOf(is.String));
   keyToNotation = k2n;
   received = true;
 }
diff --git a/denops/skkeleton/sources/user_dictionary.ts b/denops/skkeleton/sources/user_dictionary.ts
index 4551e345..9d841f8e 100644
--- a/denops/skkeleton/sources/user_dictionary.ts
+++ b/denops/skkeleton/sources/user_dictionary.ts
@@ -11,7 +11,7 @@ import {
   UserDictionaryPath,
 } from "../dictionary.ts";
 import { wrap } from "../deps/iterator_helpers.ts";
-import { assert, is } from "../deps/unknownutil.ts";
+import { is, u } from "../deps/unknownutil.ts";
 
 export class Source implements BaseSource {
   async getDictionaries(): Promise<BaseDictionary[]> {
@@ -166,7 +166,7 @@ export class Dictionary implements UserDictionary {
       return;
     }
     const rankData = JSON.parse(await Deno.readTextFile(rankPath));
-    assert(rankData, is.ArrayOf(is.String));
+    u.assert(rankData, is.ArrayOf(is.String));
     this.#rank = new Map(rankData.map((c, i) => [c, i]));
   }
 
diff --git a/denops/skkeleton/types.ts b/denops/skkeleton/types.ts
index 08adc658..0867d15d 100644
--- a/denops/skkeleton/types.ts
+++ b/denops/skkeleton/types.ts
@@ -1,5 +1,3 @@
-import { isRecord } from "./deps/unknownutil.ts";
-
 export type CompletionData = [string, string[]][];
 export type RankData = [string, number][];
 
@@ -8,13 +6,6 @@ export type CompletionMetadata = {
   kana: string;
 };
 
-export function asCompletionMetadata(x: unknown): CompletionMetadata | null {
-  if (isRecord(x) && x.tag === "skkeleton") {
-    return x as CompletionMetadata;
-  }
-  return null;
-}
-
 export const Encode = {
   "utf-32": "UTF32",
   "utf-16": "UTF16",