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

Annotations already declare destructiveHint=true, readOnlyHint=false and idempotentHint=false, so the safety profile is covered structurally. The description adds per-action parameter requirements but says nothing about what delete or pause actually does, whether deletion is reversible, or any auth expectations. No contradiction with annotations, just modest added context.

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 tightly packed sentences lead with the purpose and follow with action-specific requirements, with no filler. Semicolon-joined clauses are dense but every clause carries information.

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 6-action, nested-object, destructive tool with 12 siblings and no output schema, the description covers parameter usage but omits return/result expectations, the irreversible nature of delete, and any sibling disambiguation. Adequate for invoking the tool, incomplete for choosing it confidently.

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?

With only 40% schema coverage, the description meaningfully compensates: it tells the agent watchlist (name or id) is required for every non-list action and that update accepts filters, alert_preferences or new_name. This conditional requirement mapping is not expressible in the flat schema and is genuinely additive, though the nested filters/alert_preferences details are left to the schema.

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?

States a clear verb+resource ('Manage this account's watchlists') and the title enumerates the operations (list, update, pause, resume, delete), so an agent knows the domain immediately. It does not, however, differentiate itself from ambiguous siblings like track_federal_regulations or list_regulatory_alerts, which keeps it below a 5.

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 gives conditional parameter guidance ('action=list needs nothing else; other actions need watchlist'), which implies per-action usage. But it never states when to choose this tool over the many regulatory siblings or when-not to use it, so routing guidance is only implied.

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