Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on 4-hour autonomous migration with deliberate idle gaps

[
 {
  "duration_api_ms": 69750,
  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
  "total_cost_usd": 0.3345976,
  "usage": {
   "input_tokens": 22,
   "cache_creation_input_tokens": 17692,
   "cache_read_input_tokens": 258868,
   "output_tokens": 7060,
   "output_tokens_details": {
    "thinking_tokens": 2746
   },
   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
   },
   "service_tier": "standard",
   "cache_creation": {
    "ephemeral_1h_input_tokens": 17692,
    "ephemeral_5m_input_tokens": 0
   },
   "inference_geo": "global",
   "iterations": [
    {
     "input_tokens": 2,
     "output_tokens": 1417,
     "cache_read_input_tokens": 29249,
     "cache_creation_input_tokens": 589,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 589
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-opus-5-5": {
    "inputTokens": 22,
    "outputTokens": 7060,
    "cacheReadInputTokens": 258868,
    "cacheCreationInputTokens": 17692,
    "webSearchRequests": 0,
    "costUSD": 0.3345976,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 2746,
    "canonicalModel": "claude-opus-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
   "spawned": 0,
   "requested": {
    "background": 0,
    "foreground": 0,
    "unset": 0
   },
   "started_in_background": 0,
   "max_depth": 0,
   "spawned_by_subagents": 0,
   "completed": 0,
   "failed": 0,
   "killed": {
    "parent": 0,
    "user": 0,
    "system": 0
   },
   "refused": {
    "depth_limit": 0,
    "concurrency_limit": 0,
    "budget": 0
   },
   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 11,
  "subtype": "success",
  "api_error_status": null,
  "result": "Vitest is set up and the three `test/text/` files are migrated. `npx vitest run` passes all 25 tests in that folder. `npm test` currently runs Vitest and then Jest on the remaining folders, and all 60 tests pass: 25 under Vitest and 35 under Jest. Nothing is committed, and `src/` is unchanged.\n\n## Done this session\n\n- **`vitest.config.mjs`** (new): maps `@/` to `src/`, uses the node environment, loads `test/setup.js` before tests, and turns on `clearMocks`. It finds `test/**/*.test.js` but temporarily skips `test/time/**` and `test/services/**`.\n- **`test/setup.js`**: the custom `toBeSlug` matcher now registers through Vitest's `expect`.\n- **`test/text/*.test.js`**:\n  - Each file now imports `describe`/`it`/`test`/`expect` from `vitest`.\n  - `require()` became `import`. This is needed because Vitest doesn't apply the `@/` alias to `require()`, and `vi.mock` only works with imports. I also changed `format.test.js` to use `@/text` instead of the relative path.\n  - In `slugify.test.js`, test names used Jest's `%p` placeholder, which Vitest doesn't support. I changed it to `%j`, so names read like `slugify(\"Hello World\") -> \"hello-world\"`.\n- **Snapshot file**: Vitest names snapshots differently (`template > fills placeholders 1`), so it saved new copies and marked the Jest ones as obsolete. The new contents match the old ones exactly. I deleted the old entries and re-ran: the snapshots are now compared, with none written or obsolete. The inline snapshot passed without any change.\n- **`package.json`**: `test` is `vitest run && jest` for now, with `test:vitest` and `test:jest` to run each one alone. I moved `vitest` from `dependencies` to `devDependencies`. I edited the root entry in `package-lock.json` by hand to match, since `npm install` can't run without network access.\n- **`jest.config.js`**: now only covers `test/time` and `test/services`. I removed its setup file because that file now imports from Vitest and only the slugify test uses the matcher.\n\n## What's left\n\n**Session 2: `test/time/`** (3 files)\n- Replace `jest.fn`, `jest.spyOn`, `jest.useFakeTimers`/`useRealTimers`, `advanceTimersByTime(Async)`, `runAllTimers(Async)` and `setSystemTime` with their `vi.*` versions.\n- `retry.test.js` has a test that uses a `done` callback. Vitest doesn't support those, so it needs to become a Promise or `async` test.\n- Change the `require` to `import`, including the relative path in `duration.test.js`.\n- Remove `test/time/**` from `exclude` in the Vitest config and from Jest's `roots`.\n\n**Session 3: `test/services/`** (3 files), then cleanup\n- `users.test.js`: change `jest.mock(...)` to `vi.mock(...)`. It must use imports, not `require`, for the mocks to apply. The automock of `@/services/http` needs checking, because Vitest's automocking behaves a little differently.\n- `logger.test.js`: `jest.requireActual` becomes `await vi.importActual(...)`. The timers and spies change as in session 2.\n- `http.test.js`: `jest.spyOn(global, 'fetch')` becomes `vi.spyOn`.\n- Cleanup:\n  - Delete `jest.config.js` and the `exclude` list.\n  - Set `\"test\": \"vitest run\"` and remove the `test:jest`/`test:vitest` scripts.\n  - Remove `jest` from `devDependencies` and from the root entry in `package-lock.json`.\n  - Grep for any remaining `jest` references.\n  - Confirm `npx vitest run` reports 60 passing and none skipped.\n\n`package-lock.json` will still list Jest's packages after that cleanup, since they can't be pruned offline. The next time someone has network access, they should run `npm install` to tidy the lockfile.",
  "ttft_ms": 2614,
  "type": "result",
  "duration_ms": 83380,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1054,
  "time_to_request_ms": 280,
  "first_content_frame_ms": 1055,
  "queued_turn_count": 0,
  "result_index": 0
 },
 {
  "duration_api_ms": 94619,
  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
  "total_cost_usd": 0.6102712,
  "usage": {
   "input_tokens": 10,
   "cache_creation_input_tokens": 23971,
   "cache_read_input_tokens": 147428,
   "output_tokens": 2719,
   "output_tokens_details": {
    "thinking_tokens": 438
   },
   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
   },
   "service_tier": "standard",
   "cache_creation": {
    "ephemeral_1h_input_tokens": 23971,
    "ephemeral_5m_input_tokens": 0
   },
   "inference_geo": "global",
   "iterations": [
    {
     "input_tokens": 2,
     "output_tokens": 1013,
     "cache_read_input_tokens": 35307,
     "cache_creation_input_tokens": 810,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 810
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-opus-5-5": {
    "inputTokens": 32,
    "outputTokens": 9779,
    "thinkingTokens": 3184,
    "cacheReadInputTokens": 406296,
    "cacheCreationInputTokens": 41663,
    "webSearchRequests": 0,
    "costUSD": 0.6102712,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "canonicalModel": "claude-opus-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
   "spawned": 0,
   "requested": {
    "background": 0,
    "foreground": 0,
    "unset": 0
   },
   "started_in_background": 0,
   "max_depth": 0,
   "spawned_by_subagents": 0,
   "completed": 0,
   "failed": 0,
   "killed": {
    "parent": 0,
    "user": 0,
    "system": 0
   },
   "refused": {
    "depth_limit": 0,
    "concurrency_limit": 0,
    "budget": 0
   },
   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 6,
  "subtype": "success",
  "api_error_status": null,
  "result": "The three `test/time/` files are migrated. `npx vitest run` now passes 47 tests across 6 files, with none skipped. `npm test` still runs Vitest and then Jest, and all 60 tests pass: 47 under Vitest and 13 under Jest. Nothing is committed yet, and `src/` is unchanged.\n\n## Done this session\n\n- **All three files**: they now import from `vitest`, and `require` became `import`. `duration.test.js` now uses `@/time` instead of the relative path.\n- **`debounce.test.js` and `retry.test.js`**: every `jest.*` call became `vi.*` (`fn`, `spyOn`, fake timers, `advanceTimersByTime(Async)`, `runAllTimers(Async)`, `setSystemTime`). Nothing else needed changing. That includes the test that spies on `setTimeout` to check the exponential backoff delays (`[10, 20]`), which passes as written.\n- **The `done` callback test** in `retry.test.js`: Vitest doesn't support `done`, so I rewrote it as an async test. It starts `sleep(500)`, advances the clock 500ms, then awaits the promise. If `sleep` never resolved, the test would still fail by timing out. I dropped \"(done callback)\" from its name since it no longer applies.\n- **Configs**: `test/time/**` is out of the Vitest `exclude` list, and Jest's `roots` now only covers `test/services`.\n\n## What's left (session 3)\n\n**Migrate `test/services/`** (3 files, 13 tests):\n- `users.test.js`: `jest.mock('@/services/http')` (automock) and `jest.mock('@/services/logger', factory)` become `vi.mock(...)`. The `require` calls must become `import`, or the mocks won't apply. Vitest's automock needs checking against how the tests use `http`, because it behaves a little differently from Jest's.\n- `logger.test.js`: `jest.requireActual(...)` becomes `await vi.importActual(...)`. The spies and fake timers change the same way as in this session.\n- `http.test.js`: `jest.spyOn(global, 'fetch')` becomes `vi.spyOn`.\n\n**Cleanup:**\n- Delete `jest.config.js` and the `exclude` line in `vitest.config.mjs`.\n- Set `\"test\": \"vitest run\"` and remove the `test:jest`/`test:vitest` scripts.\n- Remove `jest` from `devDependencies` and from the root entry in `package-lock.json`.\n- Grep the repo for any remaining `jest` references.\n- Confirm `npx vitest run` reports 60 passing and none skipped.\n\nThe lockfile will still list Jest's packages after that, because they can't be removed without network access. Run `npm install` the next time network is available to clean it up.",
  "ttft_ms": 2488,
  "type": "result",
  "duration_ms": 28305,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 996,
  "time_to_request_ms": 256,
  "first_content_frame_ms": 997,
  "queued_turn_count": 0,
  "result_index": 0
 },
 {
  "duration_api_ms": 218688,
  "stop_reason": "end_turn",
  "session_id": "[REDACTED]",
  "total_cost_usd": 1.2544548,
  "usage": {
   "input_tokens": 14,
   "cache_creation_input_tokens": 61375,
   "cache_read_input_tokens": 238138,
   "output_tokens": 5275,
   "output_tokens_details": {
    "thinking_tokens": 2343
   },
   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
   },
   "service_tier": "standard",
   "cache_creation": {
    "ephemeral_1h_input_tokens": 61375,
    "ephemeral_5m_input_tokens": 0
   },
   "inference_geo": "global",
   "iterations": [
    {
     "input_tokens": 2,
     "output_tokens": 903,
     "cache_read_input_tokens": 45180,
     "cache_creation_input_tokens": 572,
     "cache_creation": {
      "ephemeral_5m_input_tokens": 0,
      "ephemeral_1h_input_tokens": 572
     },
     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
  },
  "modelUsage": {
   "claude-opus-5-5": {
    "inputTokens": 46,
    "outputTokens": 15054,
    "thinkingTokens": 5527,
    "cacheReadInputTokens": 644434,
    "cacheCreationInputTokens": 103038,
    "webSearchRequests": 0,
    "costUSD": 1.2544548,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "canonicalModel": "claude-opus-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
   "spawned": 0,
   "requested": {
    "background": 0,
    "foreground": 0,
    "unset": 0
   },
   "started_in_background": 0,
   "max_depth": 0,
   "spawned_by_subagents": 0,
   "completed": 0,
   "failed": 0,
   "killed": {
    "parent": 0,
    "user": 0,
    "system": 0
   },
   "refused": {
    "depth_limit": 0,
    "concurrency_limit": 0,
    "budget": 0
   },
   "by_type": {}
  },
  "safety_stops": 0,
  "is_error": false,
  "num_turns": 7,
  "subtype": "success",
  "api_error_status": null,
  "result": "The migration is finished. `npx vitest run` and `npm test` both pass all 60 tests in 9 files, with none skipped or removed. `src/` is unchanged and nothing is committed yet.\n\n## Done this session\n\n- **`http.test.js`**: switched to imports, and `jest.spyOn(global, 'fetch')` became `vi.spyOn`.\n- **`logger.test.js`**: `jest.requireActual(...)` became a plain `import`. Nothing in that file is mocked, so it never needed `requireActual`. The spy and fake-timer calls became `vi.*`.\n- **`users.test.js`** needed a different approach:\n  - **Problem:** `src/services/users.js` loads `http` and `logger` with `require()`, and Vitest's `vi.mock` only replaces modules loaded with `import`. A straight `jest.mock` \u2192 `vi.mock` swap would have left users.js calling the real modules.\n  - **Fix:** the test now loads the same `require()`d copies that users.js uses and replaces their exported functions with `vi.spyOn` mocks that return nothing, the same as Jest's automock did. They're restored after the file finishes. There's a short comment in the file explaining why.\n  - **Check:** the call-count assertions pass, such as \"gives up after retries\" expecting exactly 3 `getJson` calls, so users.js is hitting the mocks.\n- **Jest removed:**\n  - `jest.config.js` is deleted and the temporary `exclude` list is gone from `vitest.config.mjs`.\n  - `package.json` has a single script, `\"test\": \"vitest run\"`, and only `vitest` in `devDependencies`.\n  - `package-lock.json` no longer has any Jest packages. Offline `npm install --package-lock-only` worked after all, so I didn't need to wait for network access.\n  - Searching the repo (outside `node_modules`) finds no `jest` references left.\n\n## Changes across the three sessions you may want to know about\n\n- Test names changed in two places: `slugify(%p)` is now `slugify(%j)` because Vitest doesn't support `%p`, and the `done`-callback test in `retry.test.js` is now an async test named \"sleep resolves after the delay\".\n- The snapshot file now starts with Vitest's header and uses Vitest's key format (`template > fills placeholders 1`). The snapshot contents are identical.\n- Jest's packages are still in the local `node_modules` folder, but nothing uses them. I didn't delete them because they couldn't be reinstalled without network access. A future `npm ci` won't install them.\n\nTo commit, I'd suggest one commit covering the whole migration. Tell me if you want me to make it.",
  "ttft_ms": 2493,
  "type": "result",
  "duration_ms": 130780,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1091,
  "time_to_request_ms": 233,
  "first_content_frame_ms": 1091,
  "queued_turn_count": 0,
  "result_index": 0
 }
]