Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full behavioral burden and does almost nothing: it does not say whether patching default_targets/default_post_times retroactively affects already-scheduled rows, whether partial patches leave unspecified fields untouched, or what permissions are required. The one documented parameter (notification_message) hints at a failure-notification flow that the description never explains.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single short sentence is front-loaded and wastes no words, but its brevity here is under-specification rather than efficiency for a five-parameter mutation tool with nested objects.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

This is a mutation tool with nested-object parameters, no annotations, no output schema, and 20% schema coverage, yet the description supplies none of the missing context an agent would need to call it safely. The gap is large relative to the tool's complexity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is only 20%, and the description names just three of five parameters without explaining the patch_ prefix convention or the expected shape of the nested default_targets and default_post_times objects. calendar_id and the notification_message fallback behavior are left entirely to the schema, which documents neither meaningfully.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb (patch) and enumerates the mutable fields (title, default_targets, default_post_times), so the operation is identifiable. However, it says only "calendar" and never disambiguates from the sibling update_calendar_row or ties itself to the content calendar resource implied by its name, leaving an agent to infer scope.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no statement of when to use this tool versus update_calendar_row, create_content_calendar, or import_content_calendar_json. No prerequisites, no note that this mutates calendar-level defaults rather than individual rows, and no exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.