Investigate integration-test tool harness failures on PR #8725

[roomote]

Context

• PR: fix: scroll to edit area when editing long historical messages #8725 (branch fix/scroll-to-edit-area-for-long-messages)
• Commit: 823ab00
• Change scope: webview UI only, no backend logic changed
  • handleEditClick()
  • useEffect()

CI status

• Integration-test failed while other checks passed (Compile, CodeQL, check-translations, knip, platform-unit-test)
• Job logs: https://github.com/RooCodeInc/Roo-Code/actions/runs/18622020620/job/53094410506

Failure pattern

• Multiple assertions report tools not being detected by the e2e harness:
  • apply_diff, read_file, search_files, search_and_replace, list_files, insert_content, execute_command
• Examples from logs:
  • Roo Code search_files Tool: expected execution with file pattern filter; see out/suite/tools/search-files.test.js:475
  • Roo Code search_and_replace Tool: expected tool execution; see out/suite/tools/search-and-replace.test.js:252
  • Roo Code read_file Tool: expected tool execution; see out/suite/tools/read-file.test.js:228
  • Roo Code apply_diff Tool: expected tool execution; see out/suite/tools/apply-diff.test.js:262
• Environment in runner: Node 20.19.2, ubuntu-24.04 image

Local verification

• webview-ui tests pass locally (92 files, 1100 tests)
• Type check and lint pass in webview package

Hypothesis

• The e2e tool mocking layer in apps/vscode-e2e may not be capturing tool call events in CI, independent of the UI change in ChatRow.
• Potential causes: event wiring, test isolation, or dependency/version differences in the VS Code test runner or mocha.

Requests

• Please triage and advise ownership for the e2e harness
• Optionally re-run the failing job to check for flakiness

Suggested next steps

• Inspect how tool call events are intercepted and asserted in apps/vscode-e2e out/suite/tools/*.test.js
• Verify postMessage or proxy hooks used by the tool harness in CI environment
• Consider pinning or bumping @vscode/test-electron and mocha if a recent change altered event timing

This issue is created to track integration-test stability separately from the UI-only fix in PR #8725.

[roomote]

I'm exploring a potential fix for the integration test failures and will investigate the e2e tool harness event capturing. I'll open a PR to share progress once I've identified the root cause.

[roomote]

I've opened PR #8727 to address this issue: #8727

The fix improves the tool detection logic in the e2e tests by:

• Adding multiple detection strategies for each tool to handle various message formats
• Implementing fallback detection methods when JSON parsing fails
• Adding robust error handling and enhanced debugging

The implementation uses a multi-pattern detection approach that should handle the different message formats between local and CI environments. The integration tests are currently running in the PR to verify the fix works.

Feedback welcome!

[yunluo345]

I've noticed that write_file frequently causes editing errors—the model directly outputs code wrapped in

<write_file>
code
</write_file>

as plain text instead of invoking the editing tool. This issue occurs in both Roo Code and Cline. I'm using the Claude 4.5 model.

The same problem also happens with the diff tool, and some search/command tools occasionally exhibit this behavior as well—the model prints the tool tags literally instead of actually calling the tools.

However, older models rarely have this issue.

[yunluo345]

I've noticed that write_file frequently causes editing errors—the model directly outputs code wrapped in我注意到 write_file 经常导致编辑错误——模型直接输出包装在

<write_file>
code
</write_file>
as plain text instead of invoking the editing tool. This issue occurs in both Roo Code and Cline. I'm using the Claude 4.5 model.以纯文本形式保存，而不是调用编辑工具。此问题在 Roo Code 和 Cline 中均有出现。我使用的是 Claude 4.5 模型。

The same problem also happens with the diff tool, and some search/command tools occasionally exhibit this behavior as well—the model prints the tool tags literally instead of actually calling the tools.同样的问题也发生在 diff 工具上，一些搜索/命令工具偶尔也会​​出现这种行为——模型按字面意思打印工具标签，而不是实际调用工具。

However, older models rarely have this issue.然而，老款机型很少出现这个问题。

Before last night's update, this issue was very severe. After the update and testing, the problem has improved somewhat, but it still occurs occasionally.
It typically happens when, after finishing a file-editing conversation, you start a new conversation without closing the previous one—in such cases, there's a high chance this issue will reappear. The occurrence seems quite random.

[hannesrudolph]

I've noticed that write_file frequently causes editing errors—the model directly outputs code wrapped in我注意到 write_file 经常导致编辑错误——模型直接输出包装在
<write_file>
code
</write_file>
as plain text instead of invoking the editing tool. This issue occurs in both Roo Code and Cline. I'm using the Claude 4.5 model.以纯文本形式保存，而不是调用编辑工具。此问题在 Roo Code 和 Cline 中均有出现。我使用的是 Claude 4.5 模型。
The same problem also happens with the diff tool, and some search/command tools occasionally exhibit this behavior as well—the model prints the tool tags literally instead of actually calling the tools.同样的问题也发生在 diff 工具上，一些搜索/命令工具偶尔也会​​出现这种行为——模型按字面意思打印工具标签，而不是实际调用工具。
However, older models rarely have this issue.然而，老款机型很少出现这个问题。

Before last night's update, this issue was very severe. After the update and testing, the problem has improved somewhat, but it still occurs occasionally. It typically happens when, after finishing a file-editing conversation, you start a new conversation without closing the previous one—in such cases, there's a high chance this issue will reappear. The occurrence seems quite random.

This comment is unrelated to the integration-test harness issue being discussed. The write_file tag is not a Roo Code tool, and this behavior is caused by the model failing to properly call tools, not by anything in our codebase. This is a model-side limitation, not a Roo Code bug. Please open a separate issue if you’d like to track that specifically.