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

Annotations already establish read-only, idempotent, non-destructive behavior, and the description adds useful non-schema behavior: oldest-first ordering, cursor-based incremental reads, free cost, and API-key requirement. It stops short of explaining filter behavior or output pagination metadata, so not a 5.

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?

Three short clauses, front-loaded with the resource and ordering, then pagination and cost/auth. No redundant restatement of annotations.

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?

An output schema and annotations cover much of the calling contract, and the description adds ordering, pagination, and auth/cost. However, with 0% schema description coverage and four optional filters, the lack of guidance for limit/types/watch_id leaves an agent guessing about filtering.

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 coverage is 0%, so the description must explain all four parameters. It partially explains cursor via next_cursor, but says nothing about limit, types, or watch_id, leaving most filter semantics undocumented.

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 identifies the resource as the account's watch events and specifies oldest-first ordering, so it is more than a name restatement. It does not explicitly distinguish this event feed from list_watches or the lookup_* tools, but the resource is clear.

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?

It gives pagination usage ('Keep next_cursor...') and constraints (free, API key required), which helps invocation. It does not state when to choose this over list_watches or how the optional filters should be used.

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