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

The description discloses the behavioral traits for each action: extend adds occurrences, end cancels upcoming (with pause mode), resume restarts. Annotations already mark destructiveHint: true, and the description does not contradict this; it adds detail on what each action does.

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?

The description is two sentences with no wasted words. The first sentence packs all action definitions, the second states prerequisites. Information is front-loaded and every sentence is necessary.

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?

For a management tool with 5 parameters and no output schema, the description covers the actions, required params, and host prerequisite. It is sufficient for an AI to decide when to use it and how to fill parameters. Minor omission: no mention of return values, but output schema is absent.

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?

The input schema has no descriptions for parameters (coverage 0%), but the description explains how parameters like additional_count (for extend), mode and from_date (for end) are used. This adds meaning beyond the schema enums and constraints.

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 uses a specific verb 'Manage' with resource 'Event Series', and clearly lists three distinct actions (extend, end, resume) with their effects. It distinguishes from sibling tools like cancel_event (which cancels single events) and create_event_series (which creates new series).

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?

The description specifies that you must be a host of the series and requires series_id and action. It gives clear context for when to use this tool (to extend, end, or resume a recurring series). However, it does not explicitly mention when not to use alternatives, but the context is clear given the sibling list.

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