Solid foundation with well-structured schemas and clear naming conventions. All 10 tools have explicit input schemas with proper type definitions and enums. Descriptions are present and actionable (avg ~120 chars). However, parameter descriptions are largely absent, the code shows parameters like 'filter', 'kind', 'limit', 'id', 'name', 'until' with no inline documentation of what they control or their constraints. Output schemas are not documented. Error handling is present but generic. The codebase demonstrates thoughtful design (e.g., _idOrNameNote DRY principle, canonicalize() for package identity), but LLM-facing documentation is incomplete.

• Add parameter descriptions to all tool schemas. For each parameter, document: what it controls, valid values/ranges, and format. E.g., 'filter (string, enum): Filter results by status. "all" returns all watches; "unread" shows only watches with unreleased versions; "outdated" shows watches pinned below the latest release.'
• Document output schemas in tool descriptions. Specify what fields are returned and their types. E.g., 'Returns a watch object with fields: id (integer), name (string), kind (enum), usage_count (integer), unread_count (integer), last_checked (ISO 8601 string).'
• Add error recovery guidance to descriptions. E.g., 'If the watch is not found, try search_watches() with a partial name to locate it. If the name is ambiguous across package registries, provide the id parameter to disambiguate.'
• Implement a confirm_remove_watch tool or add a 'dry_run' parameter to remove_watch. Return what would be deleted without actually deleting, letting agents confirm before executing.
• Expose tool annotations (readOnlyHint, destructiveHint, idempotentHint) in MCP tool definitions via the inputSchema or a separate metadata field. This enables clients to display safety warnings and retry logic.