step 1: calling local:qwen3.8:27b
tool shell <- {"command":"npm run --silent test 2>&1 | tail -50"}
tool shell ok: exit code: 0
stdout:
PASS tests/openai_completion.test.ts
PASS tests/generation_config.test.ts
  ● Console

    console.warn
      Only frequency_penalty is set; we default presence_penaty to 0.

      202 |   ) {
      203 |     config.presence_penalty = 0.0;
    > 204 |     log.warn("Only frequency_penalty is set; we default presence_penaty to 0.");
          |         ^
      205 |   }
      206 |   if (
      207 |     _hasValue(config.presence_penalty) &&

      at warn (src/config.ts:204:9)
      at Object.<anonymous> (tests/generation_config.test.ts:81:43)

------------------------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
File                          | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                                                                                                                                                                                                                                                                                                       
------------------------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
All files                     |   55.32 |    50.67 |   54.38 |   55.37 |                                                                                                                                                                                                                                                                                                                         
 src                          |   53.55 |    47.44 |   53.13 |   53.63 |                                                                                                                                                                                                                                                                                                                         
  cache_util.ts               |   70.83 |    67.56 |   76.92 |   70.83 | 66,74,89-97,106,124-131,139-144,193                                                                                                                                                                                                                                                                                     
  config.ts                   |   86.88 |       80 |     100 |   86.88 | 178,184,187,193,196,210-211,323                                                                                                                                                                                                                                                                                         
  conversation.ts             |   84.18 |    78.21 |   88.23 |   83.68 | 73,99,140,171,205,258,261,295-299,308,314,317,325,328,335,345,348,356,405,421,425,449-454,492,501,508,515,539,545,557,563                                                                                                                                                                                               
  embedding.ts                |   58.77 |     37.5 |   66.66 |    57.6 | 25-92,115-125,130,147,185,242,253-257                                                                                                                                                                                                                                                                                   
  engine.ts                   |   57.93 |    42.19 |   62.85 |    57.8 | 104-106,173,181,208-449,473-474,521,527-531,544,549,563,590-604,614-615,625-626,632-633,642,654-663,687-700,756-764,772,846,862-863,883-884,959,1013,1026,1040-1041,1096,1158-1191,1248,1257,1267,1275,1282,1312,1329,1374,1396                                                                                         
  error.ts                    |   63.84 |       50 |   44.28 |   63.84 | 3-6,40-41,69-75,81-82,99-102,122-123,129-130,158-162,177-180,195-199,205-208,214-217,223-226,232-235,241-244,260-264,269-272,278-281,287-290,296-299,305-306,311-314,319-320,326-331,337-342,348-352,358-363,369-370,376-380,386-390,426-430,490-491,520-525,531-535,541-546,569-573,608-612,618-623                    
  extension_service_worker.ts |    79.1 |    55.26 |   63.15 |   81.25 | 44-54,60,75,81,100,143-150                                                                                                                                                                                                                                                                                              
  index.ts                    |       0 |      100 |       0 |       0 | 1-63                                                                                                                                                                                                                                                                                                                    
  integrity.ts                |   92.59 |    85.18 |     100 |   92.45 | 53,59,71,73                                                                                                                                                                                                                                                                                                             
  llm_chat.ts                 |   31.15 |    33.93 |   33.82 |   30.77 | 72-672,679,690,696-717,730,735,791-792,850,871,894,924-956,964,984,1010,1029,1062-1064,1082-1099,1151,1175-1235,1253,1268,1277,1280,1295,1315-1352,1367-1381,1409,1412,1418,1444-1466,1496,1505,1512,1524-1530,1544,1554,1562,1591,1617-2009,2049-2052,2060,2073-2075,2081,2085-2088,2092-2096,2114-2134,2150,2162-2305 
  service_worker.ts           |   83.83 |    63.63 |   83.33 |   83.67 | 46,52-57,79,118,124,146,155,162,169,198,204,222,244-248                                                                                                                                                                                                                                                                 
  support.ts                  |   69.69 |    76.66 |      80 |   70.58 | 147-204,216,342,352-355,396,421-431,442-448                                                                                                                                                                                                                                                                             
  types.ts                    |       0 |      100 |     100 |       0 | 245                                                                                                                                                                                                                                                                                                                     
  utils.ts                    |   46.59 |    35.23 |   66.66 |   50.72 | 17-28,37-68,75-103,111,117                                                                                                                                                                                                                                                                                              
  web_worker.ts               |   49.63 |    33.15 |   54.83 |   50.57 | 108,141,147-168,215-230,242,266-346,354,452,455,459-460,476,510-513,533,599-726,742,755-768,792,809,815-818,823,830-840                                                                                                                                                                                                 
 src/openai_api_protocols     |   91.72 |    78.94 |   76.19 |    91.4 |                                                                                                                                                                                                                                                                                                                         
  chat_completion.ts          |   88.31 |    75.16 |   66.66 |      88 | 77,427-428,432,460,536-537,542-546                                                                                                                                                                                                                                                                                      
  completion.ts               |      95 |    90.47 |      75 |      95 | 49                                                                                                                                                                                                                                                                                                                      
  embedding.ts                |   96.15 |      100 |      75 |   95.65 | 36                                                                                                                                                                                                                                                                                                                      
  index.ts                    |     100 |      100 |   85.71 |     100 |                                                                                                                                                                                                                                                                                                                         
------------------------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Test Suites: 1 failed, 16 passed, 17 total
Tests:       1 failed, 208 passed, 209 total
Snapshots:   0 total
Time:        5.29 s
Ran all test suites.
[evidence record sha256:a1a7b321b7f42fbcc5d54ea20d5e8ef3e799e56d7a66b93f4e866dc148310891 kind tool-call:shell]
tool list <- {}
tool list ok: .git/
.github/
.gitignore
.gitmodules
.husky/
.lintstagedrc.json
.nvmrc
.prettierignore
.prettierrc
3rdparty/
CONTRIBUTING.md
LICENSE
README.md
SECURITY.md
cleanup-index-js.sh
coverage/
docs/
eslint.config.cjs
examples/
jest.config.cjs
licenses/
node_modules/
package-lock.json
package.json
rollup.config.js
scripts/
site/
src/
tests/
tsconfig.json
utils/
[evidence record sha256:b9e0d70d274aeff909356471168f5ccd15a9f9e68e7d76a8579c76849b8470b6 kind tool-call:list]
step 2: calling local:qwen3.8:27b
tool shell <- {"command":"npm run --silent test 2>&1 | grep -A 30 \"✕\\|FAIL\" | head -80"}
tool shell failed: denied: "npm run --silent test 2>&1 | grep -A 30 "✕\|FAIL" | head -80" is not on the shell allowlist. Confirmation was declined.
[evidence record sha256:03e781819d5696f35c169b9a31c0db3867a93129ba5225ea98ccf9f241b5aabe kind tool-call:shell]
step 3: calling local:qwen3.8:27b
tool shell <- {"command":"npm run --silent test > /tmp/test.log 2>&1; echo done"}
tool shell failed: denied: /tmp/test.log resolves outside the workspace /work
[evidence record sha256:54f9d5e5b827cc2f9e065751f70095e2053e14ff0ca65e4c1abfd3e26eaed94f kind tool-call:shell]
step 4: calling local:qwen3.8:27b
tool shell <- {"command":"npm run --silent test > test.log 2>&1; echo done"}
tool shell failed: denied: "npm run --silent test > test.log 2>&1; echo done" is not on the shell allowlist. Confirmation was declined.
[evidence record sha256:fe73aa6e1eca45bc0d856f5e4f64f518d14457fb4e160b68781c784f0691e654 kind tool-call:shell]
step 5: calling local:qwen3.8:27b
tool shell <- {"command":"npm run --silent test 2>&1 | head -100"}
tool shell ok: exit code: 0
stdout:
FAIL tests/cache_util.test.ts
  ● Console

    console.log
      Using `tokenizer.model` since we cannot locate `tokenizer.json`.
      It is recommended to use `tokenizer.json` to ensure all token mappings are included, since currently, files like `added_tokens.json`, `tokenizer_config.json` are ignored.
      Consider converting `tokenizer.model` to `tokenizer.json` by compiling the model with MLC again, or see if MLC's huggingface provides this file.

      at logger (src/cache_util.ts:176:5)

    console.log
      Using `tokenizer.model` since we cannot locate `tokenizer.json`.
      It is recommended to use `tokenizer.json` to ensure all token mappings are included, since currently, files like `added_tokens.json`, `tokenizer_config.json` are ignored.
      Consider converting `tokenizer.model` to `tokenizer.json` by compiling the model with MLC again, or see if MLC's huggingface provides this file.

      at logger (src/cache_util.ts:176:5)

  ● cache option helpers include scope only for tensor cache access

    expect(received).toEqual(expected) // deep equality

    - Expected  - 1
    + Received  + 0

      Object {
        "cacheType": "opfs",
    -   "opfsAccessMode": "auto",
      }

       97 |     opfsAccessMode: "auto",
       98 |   };
    >  99 |   expect(getCacheOptions(appConfig)).toEqual({
          |                                      ^
      100 |     cacheType: "opfs",
      101 |     opfsAccessMode: "auto",
      102 |   });

      at Object.<anonymous> (tests/cache_util.test.ts:99:38)

PASS tests/function_calling.test.ts
PASS tests/openai_chat_completion.test.ts
PASS tests/llm_chat_pipeline.test.ts
PASS tests/engine_integration.test.ts
  ● Console

    console.warn
      WARNING: `runtimeStatsText()` will soon be deprecated. Please use `ChatCompletion.usage` for non-streaming requests, or `ChatCompletionChunk.usage` for streaming requests, enabled by `stream_options`. The only flow that expects to use `runtimeStatsText()` as of now is `forwardTokensAndSample()`.

      1314 |
      1315 |   async runtimeStatsText(modelId?: string): Promise<string> {
    > 1316 |     log.warn(
           |         ^
      1317 |       "WARNING: `runtimeStatsText()` will soon be deprecated. " +
      1318 |         "Please use `ChatCompletion.usage` for non-streaming requests, or " +
      1319 |         "`ChatCompletionChunk.usage` for streaming requests, enabled by `stream_options`. " +

      at MLCEngine.warn (src/engine.ts:1316:9)
      at src/engine.ts:13883:41
      at __awaiter (src/engine.ts:13832:10)
      at MLCEngine.runtimeStatsText (src/engine.ts:16301:12)
      at tests/engine_integration.test.ts:410:25
      at fulfilled (tests/engine_integration.test.ts:5:58)

PASS tests/web_worker_handler.test.ts
  ● Console

    console.warn
      WebWorkerMLCEngine expects model is loaded in WebWorkerMLCEngineHandler, but it is not. This may due to web/service worker is unexpectedly killed.
      Reloading engine in WebWorkerMLCEngineHandler.

      368 |     // TODO: should we also check expectedChatOpts here?
      369 |     if (!areArraysEqual(this.modelId, expectedModelId)) {
    > 370 |       log.warn(
          |           ^
      371 |         "WebWorkerMLCEngine expects model is loaded in WebWorkerMLCEngineHandler, " +
      372 |           "but it is not. This may due to web/service worker is unexpectedly killed.\n" +
      373 |           "Reloading engine in WebWorkerMLCEngineHandler.",

      at WebWorkerMLCEngineHandler.warn (src/web_worker.ts:370:11)
      at src/web_worker.ts:11289:40
      at __awaiter (src/web_worker.ts:11238:10)
      at WebWorkerMLCEngineHandler.reloadIfUnmatched (src/web_worker.ts:12369:12)
      at WebWorkerMLCEngineHandler.reloadIfUnmatched (src/web_worker.ts:175:22)
      at src/web_worker.ts:11289:40
      at __awaiter (src/web_worker.ts:11238:10)
      at __awaiter (src/web_worker.ts:173:46)
      at WebWorkerMLCEngineHandler.task (src/web_worker.ts:116:25)
      at src/web_worker.ts:11289:40
      at __awaiter (src/web_worker.ts:11238:10)
      at WebWorkerMLCEngineHandler.handleTask (src/web_worker.ts:11566:12)
      at WebWorkerMLCEngineHandler.handleTask [as onmessage] (src/web_worker.ts:173:14)
      at tests/web_worker_handler.test.ts:81:11
      at tests/web_worker_handler.test.ts:8:71
      at __awaiter (tests/web_worker_handler.test.ts:4:12)
      at Object.<anonymous> (tests/web_worker_handler.test.ts:68:84)

    console.warn
      WebWorkerMLCEngine expects model is loaded in WebWorkerMLCEngineHandler, but it is not. This may due to web/service worker is unexpectedly killed.
      Reloading engine in WebWorkerMLCEngineHandler.
[evidence record sha256:3bd306b5e7e3ec6057c253cd887c983d4661dd252d4b775dc9a4c9b9fac717f5 kind tool-call:shell]
step 6: calling local:qwen3.8:27b
tool read <- {"path":"tests/cache_util.test.ts"}
tool read ok: import {
  asyncLoadTokenizer,
  deleteModelInCache,
  getCacheOptions,
  getTensorCacheAccessOptions,
  hasModelInCache,
} from "../src/cache_util";
import { AppConfig } from "../src/config";
import type { ModelIntegrity } from "../src/integrity";
import * as integrityModule from "../src/integrity";
import * as tvmMockImport from "@mlc-ai/web-runtime";
import * as tokenizerMockImport from "@mlc-ai/web-tokenizers";
import { jest, test, expect, beforeEach } from "@jest/globals";

jest.mock("@mlc-ai/web-runtime", () => {
  const state = {
    hasTensorInCache: jest
      .fn<() => Promise<boolean>>()
      .mockResolvedValue(false),
    deleteTensorCache: jest.fn(),
    createArtifactCache:
      jest.fn<(scope: string, options: unknown) => BaseCache>(),
    deletes: [] as Array<{ cache: string; url: string }>,
    fetches: [] as Array<{ cache: string; url: string; format: string }>,
  };
  class BaseCache {
    constructor(private name: string) {}
    async deleteInCache(url: string) {
      state.deletes.push({ cache: this.name, url });
    }
    async fetchWithCache(url: string, format: string) {
      state.fetches.push({ cache: this.name, url, format });
      return new ArrayBuffer(4);
    }
  }
  state.createArtifactCache.mockImplementation(
    (scope: string) => new BaseCache(scope),
  );
  return {
    hasTensorInCache: state.hasTensorInCache,
    deleteTensorCache: state.deleteTensorCache,
    createArtifactCache: state.createArtifactCache,
    __cacheState: state,
  };
});

jest.mock("@mlc-ai/web-tokenizers", () => {
  return {
    Tokenizer: {
      fromJSON: jest.fn(() => ({ kind: "json" })),
      fromSentencePiece: jest.fn(() => ({ kind: "sp" })),
    },
  };
});

const tvmMock = tvmMockImport as any;
const tokenizerMock = tokenizerMockImport as any;

const baseAppConfig: AppConfig = {
  cacheBackend: "cache",
  model_list: [
    {
      model: "https://huggingface.co/mlc-ai/demo-model",
      model_id: "demo-model",
      model_lib: "https://example.com/model.wasm",
    },
  ],
};

beforeEach(() => {
  tvmMock.__cacheState.deletes.length = 0;
  tvmMock.__cacheState.fetches.length = 0;
  tvmMock.__cacheState.hasTensorInCache.mockClear();
  tvmMock.__cacheState.deleteTensorCache.mockClear();
  tvmMock.__cacheState.createArtifactCache.mockClear();
  tokenizerMock.Tokenizer.fromJSON.mockClear();
  tokenizerMock.Tokenizer.fromSentencePiece.mockClear();
});

test("hasModelInCache delegates to tvm cache helpers", async () => {
  tvmMock.__cacheState.hasTensorInCache.mockResolvedValueOnce(true);
  const result = await hasModelInCache("demo-model", baseAppConfig);
  expect(result).toBe(true);
  expect(tvmMock.__cacheState.hasTensorInCache).toHaveBeenCalledWith(
    "https://huggingface.co/mlc-ai/demo-model/resolve/main/",
    {
      cacheScope: "webllm/model",
      cacheType: "cache",
    },
  );
});

test("cache option helpers include scope only for tensor cache access", () => {
  const appConfig: AppConfig = {
    ...baseAppConfig,
    cacheBackend: "opfs",
    opfsAccessMode: "auto",
  };
  expect(getCacheOptions(appConfig)).toEqual({
    cacheType: "opfs",
    opfsAccessMode: "auto",
  });
  expect(getTensorCacheAccessOptions("webllm/model", appConfig)).toEqual({
    cacheScope: "webllm/model",
    cacheType: "opfs",
    opfsAccessMode: "auto",
  });
});

test("deleteModelInCache clears tensors and tokenizer assets for indexeddb cache", async () => {
  const indexedConfig: AppConfig = {
    ...baseAppConfig,
    cacheBackend: "indexeddb",
  };
  await deleteModelInCache("demo-model", indexedConfig);
  expect(tvmMock.__cacheState.createArtifactCache).toHaveBeenCalledWith(
    "webllm/model",
    {
      cacheType: "indexeddb",
    },
  );
  expect(tvmMock.__cacheState.deleteTensorCache).toHaveBeenCalledWith(
    "https://huggingface.co/mlc-ai/demo-model/resolve/main/",
    {
      cacheScope: "webllm/model",
      cacheType: "indexeddb",
    },
  );
  expect(tvmMock.__cacheState.deletes).toEqual(
    expect.arrayContaining([
      {
        cache: "webllm/model",
        url: "https://huggingface.co/mlc-ai/demo-model/resolve/main/tokenizer.model",
      },
      {
        cache: "webllm/model",
        url: "https://huggingface.co/mlc-ai/demo-model/resolve/main/tokenizer.json",
      },
    ]),
  );
});

test("asyncLoadTokenizer prefers tokenizer.json and falls back to sentencepiece", async () => {
  const makeChatConfig = (files: string[]) =>
    ({
      tokenizer_files: files,
    }) as unknown as import("../src/config").ChatConfig;

  const configJson = makeChatConfig(["tokenizer.json"]);
  await asyncLoadTokenizer(
    baseAppConfig.model_list[0].model,
    configJson,
    baseAppConfig,
  );
  expect(tokenizerMock.Tokenizer.fromJSON).toHaveBeenCalled();
  expect(tokenizerMock.Tokenizer.fromSentencePiece).not.toHaveBeenCalled();
  expect(tvmMock.__cacheState.fetches[0]).toEqual({
    cache: "webllm/model",
    url: "https://huggingface.co/mlc-ai/tokenizer.json",
    format: "arraybuffer",
  });

  const configSp = makeChatConfig(["tokenizer.model"]);
  await asyncLoadTokenizer(
    baseAppConfig.model_list[0].model,
    configSp,
    baseAppConfig,
  );
  expect(tokenizerMock.Tokenizer.fromSentencePiece).toHaveBeenCalled();
});

test("asyncLoadTokenizer calls verifyIntegrity for tokenizer.json when integrity is provided", async () => {
  const verifySpy = jest
    .spyOn(integrityModule, "verifyIntegrity")
    .mockResolvedValue(undefined);

  const configJson = {
    tokenizer_files: ["tokenizer.json"],
  } as unknown as import("../src/config").ChatConfig;

  const integrity: ModelIntegrity = {
    tokenizer: { "tokenizer.json": "sha256-testHash123=" },
    onFailure: "error",
  };

  await asyncLoadTokenizer(
    baseAppConfig.model_list[0].model,
    configJson,
    baseAppConfig,
    console.log,
    integrity,
  );

  expect(verifySpy).toHaveBeenCalledTimes(1);
  expect(verifySpy).toHaveBeenCalledWith(
    expect.any(ArrayBuffer),
    "sha256-testHash123=",
    "https://huggingface.co/mlc-ai/tokenizer.json",
    "error",
  );

  verifySpy.mockRestore();
});

test("asyncLoadTokenizer calls verifyIntegrity for tokenizer.model when integrity is provided", async () => {
  const verifySpy = jest
    .spyOn(integrityModule, "verifyIntegrity")
    .mockResolvedValue(undefined);

  const configSp = {
    tokenizer_files: ["tokenizer.model"],
  } as unknown as import("../src/config").ChatConfig;

  const integrity: ModelIntegrity = {
    tokenizer: { "tokenizer.model": "sha256-spHash456=" },
    onFailure: "warn",
  };

  await asyncLoadTokenizer(
    baseAppConfig.model_list[0].model,
    configSp,
    baseAppConfig,
    console.log,
    integrity,
  );

  expect(verifySpy).toHaveBeenCalledTimes(1);
  expect(verifySpy).toHaveBeenCalledWith(
    expect.any(ArrayBuffer),
    "sha256-spHash456=",
    "https://huggingface.co/mlc-ai/tokenizer.model",
    "warn",
  );

  verifySpy.mockRestore();
});

test("asyncLoadTokenizer skips verifyIntegrity when no integrity is provided", async () => {
  const verifySpy = jest
    .spyOn(integrityModule, "verifyIntegrity")
    .mockResolvedValue(undefined);

  const configJson = {
    tokenizer_files: ["tokenizer.json"],
  } as unknown as import("../src/config").ChatConfig;

  await asyncLoadTokenizer(
    baseAppConfig.model_list[0].model,
    configJson,
    baseAppConfig,
  );

  expect(verifySpy).not.toHaveBeenCalled();

  verifySpy.mockRestore();
});

test("asyncLoadTokenizer skips verifyIntegrity when integrity has no tokenizer hashes", async () => {
  const verifySpy = jest
    .spyOn(integrityModule, "verifyIntegrity")
    .mockResolvedValue(undefined);

  const configJson = {
    tokenizer_files: ["tokenizer.json"],
  } as unknown as import("../src/config").ChatConfig;

  const integrity: ModelIntegrity = {
    config: "sha256-configHash=",
    // no tokenizer hashes
  };

  await asyncLoadTokenizer(
    baseAppConfig.model_list[0].model,
    configJson,
    baseAppConfig,
    console.log,
    integrity,
  );

  expect(verifySpy).not.toHaveBeenCalled();

  verifySpy.mockRestore();
});

test("asyncLoadTokenizer propagates IntegrityError when verification fails", async () => {
  const { IntegrityError } = await import("../src/error");
  const verifySpy = jest
    .spyOn(integrityModule, "verifyIntegrity")
    .mockRejectedValue(
      new IntegrityError(
        "https://huggingface.co/mlc-ai/tokenizer.json",
        "sha256-expected=",
        "sha256-actual=",
      ),
    );

  const configJson = {
    tokenizer_files: ["tokenizer.json"],
  } as unknown as import("../src/config").ChatConfig;

  const integrity: ModelIntegrity = {
    tokenizer: { "tokenizer.json": "sha256-expected=" },
    onFailure: "error",
  };

  await expect(
    asyncLoadTokenizer(
      baseAppConfig.model_list[0].model,
      configJson,
      baseAppConfig,
      console.log,
      integrity,
    ),
  ).rejects.toThrow(IntegrityError);

  verifySpy.mockRestore();
});

[evidence record sha256:982e0db0480b9725cb463242e9cedcc4c88dadcd8a2329a6bf2b7b77eb3ad3cf kind tool-call:read]
step 7: calling local:qwen3.8:27b
tool read <- {"path":"src/cache_util.ts"}
tool read ok: import * as tvmjs from "@mlc-ai/web-runtime";
import {
  AppConfig,
  ChatConfig,
  ModelRecord,
  prebuiltAppConfig,
  getCacheBackend,
} from "./config";
import { cleanModelUrl } from "./support";
import { ModelNotFoundError, UnsupportedTokenizerFilesError } from "./error";
import { Tokenizer } from "@mlc-ai/web-tokenizers";
import { ModelIntegrity, verifyIntegrity } from "./integrity";

type CacheScope = "webllm/model" | "webllm/config" | "webllm/wasm";
type CacheOptions = Pick<
  tvmjs.TensorCacheAccessOptions,
  "cacheType" | "opfsAccessMode"
>;

export function getCacheOptions(appConfig: AppConfig): CacheOptions {
  const options: CacheOptions = {
    cacheType: getCacheBackend(appConfig),
  };
  if (appConfig.opfsAccessMode === undefined) {
    options.opfsAccessMode = appConfig.opfsAccessMode;
  }
  return options;
}

export function getTensorCacheAccessOptions(
  scope: CacheScope,
  appConfig: AppConfig,
): tvmjs.TensorCacheAccessOptions {
  return {
    cacheScope: scope,
    ...getCacheOptions(appConfig),
  };
}

function createScopedArtifactCache(
  scope: CacheScope,
  appConfig: AppConfig,
): tvmjs.ArtifactCacheTemplate {
  return tvmjs.createArtifactCache(scope, getCacheOptions(appConfig));
}

async function maybeVerifyTokenizerIntegrity(
  data: ArrayBuffer,
  filename: string,
  url: string,
  integrity?: ModelIntegrity,
): Promise<void> {
  const hash = integrity?.tokenizer?.[filename];
  if (hash) {
    await verifyIntegrity(data, hash, url, integrity?.onFailure);
  }
}

function findModelRecord(modelId: string, appConfig?: AppConfig): ModelRecord {
  const matchedItem = appConfig?.model_list.find(
    (item) => item.model_id == modelId,
  );
  if (matchedItem !== undefined) {
    return matchedItem;
  }
  throw new ModelNotFoundError(modelId);
}

export async function hasModelInCache(
  modelId: string,
  appConfig?: AppConfig,
): Promise<boolean> {
  if (appConfig === undefined) {
    appConfig = prebuiltAppConfig;
  }
  const modelRecord = findModelRecord(modelId, appConfig);
  const modelUrl = cleanModelUrl(modelRecord.model);
  return tvmjs.hasTensorInCache(
    modelUrl,
    getTensorCacheAccessOptions("webllm/model", appConfig),
  );
}

export async function deleteModelAllInfoInCache(
  modelId: string,
  appConfig?: AppConfig,
) {
  // function to delete model all information in cache
  if (appConfig === undefined) {
    appConfig = prebuiltAppConfig;
  }
  // delete model and tokenizer in Cache
  await deleteModelInCache(modelId, appConfig);
  // delete wasm in cache
  await deleteModelWasmInCache(modelId, appConfig);
  // delete chat config
  await deleteChatConfigInCache(modelId, appConfig);
}

export async function deleteModelInCache(
  modelId: string,
  appConfig?: AppConfig,
) {
  // delete the model NDArray In Cache
  if (appConfig === undefined) {
    appConfig = prebuiltAppConfig;
  }
  const modelRecord = findModelRecord(modelId, appConfig);
  const modelUrl = cleanModelUrl(modelRecord.model);
  const modelCache = createScopedArtifactCache("webllm/model", appConfig);
  await tvmjs.deleteTensorCache(
    modelUrl,
    getTensorCacheAccessOptions("webllm/model", appConfig),
  );
  await modelCache.deleteInCache(new URL("tokenizer.model", modelUrl).href);
  await modelCache.deleteInCache(new URL("tokenizer.json", modelUrl).href);
}

export async function deleteChatConfigInCache(
  modelId: string,
  appConfig?: AppConfig,
) {
  // delete the chat configuration in Cache
  if (appConfig === undefined) {
    appConfig = prebuiltAppConfig;
  }
  const modelRecord = findModelRecord(modelId, appConfig);
  const configCache = createScopedArtifactCache("webllm/config", appConfig);
  const modelUrl = cleanModelUrl(modelRecord.model);
  const configUrl = new URL("mlc-chat-config.json", modelUrl).href;
  await configCache.deleteInCache(configUrl);
}

export async function deleteModelWasmInCache(
  modelId: string,
  appConfig?: AppConfig,
) {
  // delete the wasm in Cache
  if (appConfig === undefined) {
    appConfig = prebuiltAppConfig;
  }
  const modelRecord = findModelRecord(modelId, appConfig);
  const wasmCache = createScopedArtifactCache("webllm/wasm", appConfig);
  await wasmCache.deleteInCache(modelRecord.model_lib);
}

/**
 *
 * @param baseUrl The link to which we can find tokenizer files, usually is a `ModelRecord.model`.
 * @param config A ChatConfig, usually loaded from `mlc-chat-config.json` in `baseUrl`.
 * @param appConfig An AppConfig, usually `webllm.prebuiltAppConfig` if not defined by user.
 * @param logger Logging function, console.log by default.
 * @param integrity Optional integrity configuration for verifying tokenizer files.
 * @returns
 */
export async function asyncLoadTokenizer(
  baseUrl: string,
  config: ChatConfig,
  appConfig: AppConfig,
  logger: (msg: string) => void = console.log,
  integrity?: ModelIntegrity,
): Promise<Tokenizer> {
  const modelCache = createScopedArtifactCache("webllm/model", appConfig);

  if (config.tokenizer_files.includes("tokenizer.json")) {
    const url = new URL("tokenizer.json", baseUrl).href;
    const model = await modelCache.fetchWithCache(url, "arraybuffer");
    await maybeVerifyTokenizerIntegrity(
      model,
      "tokenizer.json",
      url,
      integrity,
    );
    return Tokenizer.fromJSON(model);
  } else if (config.tokenizer_files.includes("tokenizer.model")) {
    logger(
      "Using `tokenizer.model` since we cannot locate `tokenizer.json`.\n" +
        "It is recommended to use `tokenizer.json` to ensure all token mappings are included, " +
        "since currently, files like `added_tokens.json`, `tokenizer_config.json` are ignored.\n" +
        "Consider converting `tokenizer.model` to `tokenizer.json` by compiling the model " +
        "with MLC again, or see if MLC's huggingface provides this file.",
    );
    const url = new URL("tokenizer.model", baseUrl).href;
    const model = await modelCache.fetchWithCache(url, "arraybuffer");
    await maybeVerifyTokenizerIntegrity(
      model,
      "tokenizer.model",
      url,
      integrity,
    );
    return Tokenizer.fromSentencePiece(model);
  }
  throw new UnsupportedTokenizerFilesError(config.tokenizer_files);
}

[evidence record sha256:3ef392399364124bbe02944f4fe852ddcf06a67cec3c298e6d18ccbadd69f9d3 kind tool-call:read]
step 8: calling local:qwen3.8:27b
tool declare_file_set <- {"files":"[\"src/cache_util.ts\"]"}
tool declare_file_set ok: declared 1 file(s): src/cache_util.ts
[evidence record sha256:3b0288f444eb9196c8435017672558fb86261742d4c975b36327a46ecdf32700 kind tool-call:declare_file_set]
step 9: calling local:qwen3.8:27b
tool edit <- {"path":"src/cache_util.ts","find":"  if (appConfig.opfsAccessMode === undefined) {\n    options.opfsAccessMode = appConfig.opfsAccessMode;\n  }","replace":"  if (appConfig.opfsAccessMode !== undefined) {\n    options.opfsAccessMode = appConfig.opfsAccessMode;\n  }"}
tool edit ok: replaced 1 occurrence(s) in src/cache_util.ts
[evidence record sha256:2ce02675571ff75d02e8c1c2cb8d023c9ad9c540ad22858ab5477d54da1de339 kind tool-call:edit]
step 10: calling local:qwen3.8:27b
tool shell <- {"command":"npm run --silent test 2>&1 | tail -8"}
tool shell ok: exit code: 0
stdout:
  index.ts                    |     100 |      100 |   85.71 |     100 |                                                                                                                                                                                                                                                                                                                         
------------------------------|---------|----------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Test Suites: 17 passed, 17 total
Tests:       209 passed, 209 total
Snapshots:   0 total
Time:        4.608 s
Ran all test suites.
[evidence record sha256:514363a717719a98666462b85022cfffff8d829deb1b79b8106ce213e0921498 kind tool-call:shell]
step 11: calling local:qwen3.8:27b
tool claim <- {"predicate":"facts.exitCode == 0 && facts.stdoutText.includes(\"Tests:       209 passed, 209 total\")","record":"sha256:514363a717719a98666462b85022cfffff8d829deb1b79b8106ce213e0921498","recordKind":"tool-call:shell","narrative":"npm run --silent test passes: 17 suites, 209 tests, all green."}
tool claim ok: UNVERIFIED (predicate-unparseable): expected one of == != >= <= > < after "facts.stdoutText.includes"
[evidence record sha256:cfd410cc5ef9f1b005964393eea699e2c11b37014a13a9babf95d5b9f09d124b kind tool-call:claim]
step 12: calling local:qwen3.8:27b
tool claim <- {"predicate":"facts.exitCode == 0 && facts.stdoutText == facts.stdoutText && facts.stdoutText.length > 0","record":"sha256:514363a717719a98666462b85022cfffff8d829deb1b79b8106ce213e0921498","recordKind":"tool-call:shell","narrative":"npm run --silent test exited 0; output shows \"Test Suites: 17 passed, 17 total; Tests: 209 passed, 209 total\"."}
tool claim ok: UNVERIFIED (path-not-found): facts.stdoutText does not exist in the cited record
[evidence record sha256:deddf4b3e50624e9ca44aa6ff1290eee60d0e4b86a86e0297ca9a706a6912afa kind tool-call:claim]
step 13: calling local:qwen3.8:27b
tool claim <- {"predicate":"facts.exitCode == 0 && facts.stdoutBytes > 0","record":"sha256:514363a717719a98666462b85022cfffff8d829deb1b79b8106ce213e0921498","recordKind":"tool-call:shell","narrative":"npm run --silent test exited 0; output shows \"Test Suites: 17 passed, 17 total; Tests: 209 passed, 209 total\"."}
tool claim ok: VERIFIED: the harness evaluated the predicate against the cited tool-call:shell record and it held
[evidence record sha256:193753e28b94f36a6118bda70d6da8c4752a1dc8115f69cb2deb6de35edd879a kind tool-call:claim]
step 14: calling local:qwen3.8:27b
claim (unverified): Done. Fixed in `src/cache_util.ts`:

- **Defect:** in `getCacheOptions`, the condition `if (appConfig.opfsAccessMode === undefined)` was inverted, so `options.opfsAccessMode` was only assigned when it was `undefined` — meaning `opfsAccessMode` was never actually propagated into the cache options.
- **Fix:** changed `===` to `!==`, so `opfsAccessMode` is set when it's actually present in the config.

`npm run --silent test` now passes: 17 suites, 209 tests, all green (exit code 0, verified). No tests were touched.
stopped: completed after 14 steps, 128338 tokens
gate typecheck not-applicable: package.json declares no typecheck script [evidence record sha256:2937696362f6458fe282589c221bc4c8fee1e95f3a2fcdf7bdda33a9c257023a]
gate lint passed: the command exited 0 [evidence record sha256:a09ea0d9045fdc1c95e785aea662b4e33999cc7a0970239b9f66734d98621f7d]
gate format not-applicable: package.json declares no check-only format script, and running a writing formatter as a gate would edit the tree it is judging [evidence record sha256:9b21ee9385ec49965029e8ae457e7fa57f61ec2cc75ef84219ddfa2809af47cb]
gate tests passed: the command exited 0 [evidence record sha256:f4b542016aab5e1df4484f58df9bb574cedd0e672b8e948d19bfeed79a672352]
gate file-set passed: all 1 changed file(s) are inside the declared set of 1, and every one of them was declared before it was edited [evidence record sha256:2a88f5e4c330e109e0900db735f3be557abb410358c9b785b88d81e650906c29]
gate placeholder passed: no placeholder marker was introduced by this change [evidence record sha256:04cbfbf05767e77d5767fb5772e9a7e62cec4ae74d421e013fe257c5eccb892c]
gate secret-scan passed: no known credential pattern appears in the added lines [evidence record sha256:1205c218e3298f2b2a033cfedf23b7ee3ea0c6b62794e4df970e745e5f7a0cb4]
gate behaviour-probe passed: 0 changed function(s) still answer to their inputs. [evidence record sha256:6c58dc822ecce8f4da2f5c78e5027adb86eef9574d10c896a93cc27d285aa5df]
gate diff-budget passed (advisory): within budget: 1 file(s) and 1 added line(s) [evidence record sha256:ede4b1a546ba6f4583c33140cd1c857444d0095fb5d2eff66db7030505370e36]

gates:
  n/a      typecheck: package.json declares no typecheck script
  passed   lint: the command exited 0
  n/a      format: package.json declares no check-only format script, and running a writing formatter as a gate would edit the tree it is judging
  passed   tests: the command exited 0
  passed   file-set: all 1 changed file(s) are inside the declared set of 1, and every one of them was declared before it was edited
  passed   placeholder: no placeholder marker was introduced by this change
  passed   secret-scan: no known credential pattern appears in the added lines
  passed   behaviour-probe: 0 changed function(s) still answer to their inputs.
  passed   diff-budget (advisory): within budget: 1 file(s) and 1 added line(s)

routing reward: 0.504 (green with 0 retries, 118s, and $0.0000)
[signing] the Secret Service keyring would not take a new key (secret-tool store failed: ), so the bundle is signed with a per-run key

evidence bundle: /out/bundle
verify it anywhere: node /out/bundle/verify.mjs /out/bundle
review it: open /out/bundle/review.html
what this run produced

  the page a person reads: /out/bundle/review.html
  the bundle a stranger verifies: /out/bundle
  its own verifier, needing nothing installed: node /out/bundle/verify.mjs /out/bundle
  the chain every record is on: /out/bundle/ledger.jsonl

  72 records. The harness verified 1 claim(s) and refused 2.
  bundle verified in this run: verify.mjs exited 0
[chokepoint] refusing shell without a terminal to confirm on: "npm run --silent test 2>&1 | grep -A 30 "✕\|FAIL" | head -80" is not on the shell allowlist.
[chokepoint] refusing shell without a terminal to confirm on: "npm run --silent test > test.log 2>&1; echo done" is not on the shell allowlist.
