The server provides 11 well-structured tools with comprehensive input schemas and descriptions. Tool naming follows verb_noun conventions (get_*, create_*, acknowledge_*, resolve_*, reassign_*), which is correct. All tools have detailed parameter descriptions with type information. However, there are significant gaps in output schema documentation, the source code does not show explicit output schema definitions for any tool. Tool descriptions are adequate (60-150 chars) but lack specificity about when to use each tool vs. alternatives. Parameter validation is good, with enum-like constraints mentioned in descriptions for status/urgency fields in get_incidents, but not formally encoded as JSON Schema enums. Error handling is present via ToolError wrapper and validation decorators, but recovery guidance is minimal. The validation decorator approach (@validation.validate_include_parameter) suggests schema enforcement, but the actual schema documents are not visible in the provided source. Security is handled via environment-based credential injection (keyring), which is correct. Overall, the tools are usable and reasonably well-designed, but lack the polish needed for a 70+ score due to missing output schemas and shallow error guidance.

• Document output schemas for all tools. Specify the structure of the returned dict, including field names, types, and whether pagination info (total_count, next_cursor, has_more) is included. Reference the Pydantic models (EscalationPolicy, Incident, Schedule, etc.) in the tool documentation.
• Enhance error messages with recovery guidance. When an invalid parameter is provided, return: 'Invalid status: got "pending", must be one of: triggered, acknowledged, resolved. Call get_incidents(incident_id=...) to see current status.' instead of raw API errors.
• Formalize enum constraints using JSON Schema. In the input schema, declare statuses, urgencies, and status enums with 'enum': ["triggered", "acknowledged", "resolved"] instead of relying on description text.
• Add discriminating descriptions to similar tools. For get_users, add: 'Use to find or retrieve user details. Returns user_id, name, email. For on-call info, use get_oncalls instead.' Similar notes for other discovery tools.
• Implement a pre-flight check tool or parameter validation that prevents misuse of incident modification tools. For example, add a require_confirmation boolean parameter to resolve_incident and acknowledge_incident, defaulting to True, so critical operations prompt before execution.
• Add per-item success/failure in batch-like responses. When multiple resources are returned (e.g. get_incidents with multiple results), indicate if any were partially loaded or failed to enrich.
• Include chaining IDs in all responses. If get_users returns user records, ensure each includes user_id, email, team_ids so downstream calls (e.g. reassign_incident with assignee_ids) do not require a second lookup.

Inferred effective spec: <=2025-11-25.

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