diagnostics

name	diagnostics
description	Access LSP diagnostics and suggest project rollback. Use for debugging static errors and helping users revert changes.

Diagnostics Skill

Tools for debugging code issues and managing project state.

When to Use

Use this skill when:

• Checking for syntax errors, type errors, or import issues after code changes
• User wants to undo changes or revert to a previous state
• Debugging static errors detected by the language server

When NOT to Use

• Runtime errors or logic bugs (use logs and debugging)
• Small changes that don't need LSP validation
• Code search (use grep/glob tools)

Available Functions

getLatestLspDiagnostics(filePath=None)

Retrieve LSP diagnostics - syntax errors, type errors, and code issues.

Parameters:

• filePath (str, optional): File path to check. If omitted, checks all files with errors.

Returns: Dict with diagnostics (file paths to error lists) and filePath (filter used)

Example:

// Check specific file after editing
const result = await getLatestLspDiagnostics({ filePath: "src/auth.ts" });
for (const [path, errors] of Object.entries(result.diagnostics)) {
    for (const error of errors) {
        console.log(`Line ${error.startLine}: ${error.message}`);
    }
}

// Check all files for errors
const allErrors = await getLatestLspDiagnostics();
console.log(`Files with errors: ${Object.keys(allErrors.diagnostics)}`);

When to check LSP:

• After refactoring >100 lines of code
• User reports "errors" or "something's not working"
• After adding imports or dependencies
• Before completing a task with >100 lines of changes

Skip LSP when:

• Making small changes (<10 lines)
• Adding comments or documentation
• Debugging runtime errors (LSP won't show these)

Suggest rollback

Suggest rolling back to a previous checkpoint. Call SuggestUserAction({ action: "rollback", message: "..." }) with a short, non-technical explanation for why rollback is suggested.

Use when user expresses intent to:

• Undo changes: "can you undo what you just did?", "revert the last changes"
• Restore previous version: "roll back", "go back to how it was yesterday"
• Fix major error: "you deleted my database!", "everything is broken"
• Try different approach: "take a completely different approach", "start over"

Important:

• This does NOT perform the rollback - it shows a "View Checkpoints" button
• After calling, direct the user to click the button that appears
• This pauses the agent to wait for user response

Best Practices

1. Check LSP after significant changes: Large refactors, new features, or when user reports errors
2. Use filePath parameter: When checking a specific file you just edited
3. Suggest rollback carefully: Only when user clearly wants to undo or revert

Example Workflows

Debugging after refactoring

// After making code changes
const errors = await getLatestLspDiagnostics({ filePath: "src/services/user.ts" });
if (Object.keys(errors.diagnostics).length > 0) {
    // Fix each error
    for (const [path, diags] of Object.entries(errors.diagnostics)) {
        for (const diag of diags) {
            console.log(`Fix: ${diag.rendered}`);
        }
    }
}