get_watching_list_items

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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered elsewhere and the bar is lower. The description adds only the per-user scoping implied by 'for a user' and says nothing about ordering, pagination, or whether unread/archived items are included — no value beyond structured data.

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 with zero padding and the resource front-loaded after the verb. Slightly awkward grammar ('Returns list of') keeps it from being exemplary, but there is no wasted content.

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?

With no output schema, the description gives no indication of what fields a watching item has, how many are returned, or whether results are paginated. For a simple read-only single-parameter list tool with full annotation coverage this is minimally adequate but leaves real gaps for an agent planning a call.

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 100% for the single required parameter (userId), so the schema already documents it. The phrase 'for a user' merely restates that the filter is by user without adding format or semantics beyond the schema, making the baseline 3 appropriate.

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?

Names a specific verb ('Returns') and a specific resource ('watching items') scoped to a user, so the agent knows what it retrieves. However, it does nothing to distinguish it from siblings such as get_watching_list_count, get_notifications, or mark_watching_as_read, which share the same domain vocabulary.

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 contains no when-to-use guidance, no prerequisites, and no mention of alternatives. An agent must infer from the name alone that this is the full-list counterpart to get_watching_list_count and the read counterpart to add/update/delete_watching.

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