The server provides 33 tools across Google Calendar, Drive, GitHub, Gmail, and VSCode integrations. Most tools have descriptions and visible schemas, placing it in the 'Fair' range. However, significant quality gaps emerge: descriptions are often generic translations (e.g., 'Lista proximos eventos del calendario principal'), many parameters lack descriptions or have minimal ones, output schemas are not formally documented, and error handling provides no recovery guidance. The code shows proper parameter typing in Python function signatures, but MCP schema documentation is sparse. Tool composition is reasonable (each tool does one thing), but chaining support is weak, many tools return bare IDs without context needed for follow-up calls. STDIO transport caps protocol readiness at 50, but definition quality issues independently drag the overall score down.

• Document return types for every tool. Add a 'Returns' section to each tool description clarifying the JSON structure, e.g., 'Returns: { id: string, htmlLink: string, summary: string }'. This enables LLMs to extract the right fields for chaining.
• Expand parameter descriptions to 50 - 100 characters with format and constraint guidance. Instead of 'Label IDs to add', write: 'List of Gmail label IDs to add to the message (e.g., ["IMPORTANT", "INBOX"]). Get label IDs from gmail_list_labels first.'
• Add per-tool error handling with recovery guidance. Catch and return structured errors: '{ error: "not_found", message: "Event not found.", suggestion: "Use calendar_upcoming to list valid event IDs." }'. Let the LLM decide next steps.
• Implement idempotency tokens or dry-run modes for destructive operations. For calendar_delete_event, add an optional 'dry_run: bool' parameter. Return '{ status: "would_delete", id: "...", warning: "This will notify attendees." }'.
• Enumerate all valid values for constrained parameters. Add enums to drive_share_file.role, github_merge_pull_request.merge_method, and similar. Document the format in the description: 'One of: reader, commenter, writer, editor (only writable folders).'
• Return supporting IDs for tool chaining. Ensure drive_create_file returns both file_id and parent_id (for shared folder context). Ensure github_create_pull_request returns repo_full_name, pr_number, and head_branch for follow-ups.
• Add discovery tools or annotate when lookup tools are needed. For example, calendar_create_event could note: 'If using attendee email, you may need to validate addresses via a separate lookup tool first.' Or provide a companion tool like list_gmail_labels.