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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true. The description adds useful behavioral context: ordering ('newest first') and return shape ('Returns { items, nextCursor }'), but these are modest additions beyond what annotations convey.

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, front-loaded with the action verb 'List', and includes only essential details (ordering, filtering, pagination, return shape). No filler or redundancy.

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 simple list tool with robust annotations and full schema coverage, the description is complete. It specifies the return shape ({ items, nextCursor }) and pagination behavior, which is sufficient given no output schema. The sibling tool names provide additional context for differentiation.

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 100% description coverage, with all three parameters (limit, cursor, status) already explained. The description mentions 'filtered by status' and 'paged' but adds no extra meaning beyond the schema, so the baseline of 3 is 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?

The description uses a specific verb+resource construction: 'List your watches' with added scope ('newest first', 'optionally filtered by status and paged'). It clearly distinguishes itself from sibling tools like watch_get (single watch) and watch_runs.

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 provides clear context for when to use the tool: listing watches with optional filtering and pagination. However, it does not explicitly mention alternatives or exclusions (e.g., 'for a single watch, use watch_get'), so it falls short of a 5.

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