The Commvault MCP server defines 32 tools with consistent naming and mostly adequate descriptions. Tool names follow verb-noun patterns (get_*, create_*, run_*, etc.) appropriately. All 32 tools have descriptions present (range 15 - 158 chars, median ~80 chars, well within the 10 - 1024 baseline). Input schemas are complete with proper JSON Schema type declarations and parameter descriptions. However, several gaps reduce the score: (1) Output schemas are NOT documented, responses are not described in tool definitions, forcing LLMs to infer structure. (2) Some descriptions are terse (15 - 30 chars) and lack context on when to use the tool or what it returns. (3) Parameters lack enum constraints where they should have them (e.g., backup_type and job_status accept free-form strings instead of constrained enums). (4) Error handling guidance is absent, tools provide no recovery instructions. (5) The server lacks tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite the MCP spec supporting them since 2024. (6) No documentation of multi-step flows (e.g., when to call get_clientid_from_clientname before get_subclient_list). The core structure is sound, but LLM-optimization and production-grade error handling are missing.

• Document output schemas for all 32 tools. For each tool, add a 'returns' section to the description explaining the response structure. E.g., for get_job_detail: 'Returns a job object with fields: job_id (int), status (string), start_time (ISO8601), end_time (ISO8601), task_count (int), ...'
• Convert free-form string parameters to enums where values are constrained. Change 'backup_type' from string to enum ['Full', 'INCREMENTAL', 'SYNTHETIC_FULL']. Change 'job_status' to enum ['Active', 'Finished', 'All']. Change 'identifier_type' to enum ['name', 'id'].
• Add tool annotations: mark all read_* and get_* tools with readOnlyHint=true. Mark kill_job, resubmit_job, and create_send_logs_* with destructiveHint=true. Mark suspend_job/resume_job with idempotentHint=true.
• Expand terse descriptions to 50 - 150 characters. Example: 'get_sla_status': 'Retrieves the SLA compliance status for all backup jobs in the Commcell, returning a summary of met vs. missed SLAs and the overall percentage of compliance. Use this to assess backup health.'
• Add recovery guidance to tool descriptions. E.g., for get_subclient_list: 'If you have a client name but not client_id, call get_clientid_from_clientname() first.' For parameter validation failures, add: 'If the call fails with an invalid identifier error, verify the client_name or client_id exists by calling get_client_list().'
• Document parameter relationships and dependencies explicitly. E.g., in get_subclient_list: 'If identifier_type is "name", pass a client display name. If "id", pass a numeric client_id. The two are mutually exclusive, do not mix.'