This is an authentication library, not an MCP server. The three tools (readGmail, createGitHubIssue, updateNotionPage) are defined only in example code (examples/mcp_auth_example.ts), not in actual server registration code. No MCP server implementation is visible, only a TypeScript auth utility class (MCPAuth) with no tool registration, no transport layer, and no protocol implementation. Tool definitions are inferred from example usage, not explicitly registered. The library provides OAuth plumbing but does not expose tools via MCP.

• Build an actual MCP server that registers tools via the MCP protocol. Use the MCPAuth library as a dependency, but create a separate server.ts or index.ts that implements the MCP Server interface and exposes tools with proper registration.
• Add explicit output schemas for each tool. Document what fields are returned (e.g., readGmail returns {success: boolean, messages: Array<{id, from, subject}>, error?: string}). Include this in tool metadata.
• Expand parameter descriptions to 50-100 chars. E.g., 'The user ID (email or internal ID) for whom to fetch Gmail messages. Required.' Include format hints and constraints.
• Implement error classification. Return structured errors with a 'code' field (e.g., 'auth_required', 'not_found', 'rate_limited') and a 'recovery' field with next steps (e.g., 'Call getAuthUrl() to re-authenticate').
• Add tool annotations (readOnlyHint, destructiveHint) to clarify side effects. Mark readGmail as read-only; mark createGitHubIssue and updateNotionPage as destructive so agents know they have irreversible consequences.