feat: Add read_lints tool

[kels-ng]

Add read_lints tool

Related GitHub Issue

Closes: #11827

Roo Code Task Context (Optional)

None.

Description

This PR adds a read_lints tool so the assistant can query linter errors and warnings from the workspace, similar to Cursor’s ReadLints.

• Tool behavior: Optional paths (file or directory). When omitted, lints are limited to files edited in the current task; when provided, lints are limited to those paths. Uses existing diagnosticsToProblemsString and respects includeDiagnosticMessages and maxDiagnosticMessages from extension state.
• Edited-file tracking: Task gets editedFilePaths and recordEditedFile(relPath). DiffViewProvider calls recordEditedFile after successful saveDirectly and saveChanges so “edited only” mode is accurate.
• Integration: New native tool definition and ReadLintsTool handler; registration in native-tools index, presentAssistantMessage (including tool description for streaming), and NativeToolCallParser (with coerceStringArray for paths). Added to toolNames, TOOL_GROUPS.read, NativeToolArgs, and TOOL_DISPLAY_NAMES.

No approval UX for read_lints (read-only, like list_files / read_file).

Test Procedure

• Unit tests: src/core/tools/__tests__/readLintsTool.spec.ts — six cases: no paths + no edited files → “no files edited yet” message; no paths + edited files → diagnostics filtered to those files; includeDiagnosticMessages: false → “No errors or warnings”; with paths → diagnostics for requested file; empty diagnostics → “No errors or warnings”; severity filter → only Error and Warning passed to diagnosticsToProblemsString.
• How to run: From repo root, run tests for the roo-cline package (e.g. pnpm exec vitest run core/tools/__tests__/readLintsTool.spec.ts from the src directory). Full typecheck: pnpm run check-types.
• Manual check: Start a task, edit a file via Roo, then trigger read_lints with no args and confirm only that file’s lints appear; call read_lints with a specific path and confirm only that path’s lints appear.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

No UI changes. Tool appears in chat as a tool call (e.g. [read_lints] or [read_lints for paths]) and returns text with diagnostics.

Documentation Updates

• No documentation updates are required.

Additional Notes

• Reuses diagnosticsToProblemsString from src/integrations/diagnostics; no new dependencies.
• Path normalization uses path.relative(cwd, ...).toPosix() so edited-file matching is consistent across platforms.

Get in Touch

kels9009

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