Server defines only 3 authentication tools with minimal schemas and descriptions. Tool names lack action verbs (login/logout/verify-login are acceptable but generic). Descriptions are present but extremely brief (10-30 chars), well below the 50-200 char baseline for LLM optimization. Input schemas exist for login (force: boolean) but logout and verify-login have empty schemas. No output schemas documented. Error handling returns JSON strings in text fields rather than structured error objects with recovery guidance. The server appears designed primarily for auth flow, not as a full Microsoft 365 API gateway despite references to graph-tools.ts and OpenAPI generation infrastructure.

• Add output schema documentation for all tools. Example: login returns {status: string, success: boolean, user?: {id, email, displayName}, expiresAt?: ISO8601}.
• Expand tool descriptions to 50-200 chars. Example: 'Authenticate with Microsoft 365 using device code flow. Call this first if not logged in. Returns user identity and token expiration. Requires user to complete browser-based device code flow.'
• Add descriptions to all parameters. The 'force' parameter in login needs: 'Force a new login even if already logged in (boolean, default false). Use when token may be stale.'
• Restructure error responses as {isError: true, code: string, message: string, recovery: string} instead of JSON strings in text fields. Example: {isError: true, code: 'AUTH_FAILED', message: 'Device code expired', recovery: 'Call login again to restart the flow'}.
• Rename verify-login to check_login_status or test_authentication for clarity. Add description: 'Check if current session is authenticated and token is valid. Returns user identity and token expiration. No side effects.'

Inferred effective spec: 2026-07-28+.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry