Single tool 'vscode' has a well-structured input schema with proper enum constraints and parameter descriptions. However, the tool description is moderately detailed but lacks clarity on when to use it vs alternatives, and the output schema is completely undocumented. No error handling guidance is provided. The tool performs multiple distinct actions (open_file, open_diff, open_external, reveal_in_explorer, active_editor, apply_selection) which violates single-responsibility principle, these should ideally be separate tools or at least grouped with clearer action-specific documentation.

• Document the output schema for each action. Example: 'open_file returns {success: boolean, path: string, line: number, content: string}'. This enables LLMs to extract and chain results.
• Split vscode into focused tools: open_vscode_file, open_vscode_diff, open_external_link, reveal_vscode_path, read_vscode_editor, replace_vscode_selection. Each tool does one thing, reducing LLM reasoning overhead.
• Add error handling guidance: 'If file not found, returns {success: false, error: "File not found at path", suggestion: "Check path is absolute or workspace-relative"}'. This guides LLM recovery.
• Enhance tool description with usage context: 'Use this tool to navigate the user's VS Code editor, view diffs, or apply code changes. Call open_vscode_file to jump to a specific location, open_vscode_diff to show before/after, or replace_vscode_selection to modify the active selection.'
• Add enum constraint for 'language' parameter in open_diff: restrict to common language IDs (javascript, typescript, python, java, etc.) or document the full set of valid values.