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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the event taxonomy but does not disclose permission/auth needs, what 'delete' actually removes, or return behavior of 'get', so it adds only marginal context beyond the structured fields.

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?

Two sentences, front-loaded with the tool's function and followed by the event list. No filler or repetition; only slight room to tighten the event enumeration.

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 3-parameter tool with full schema coverage and no output schema, the description covers the actions and events adequately. The one gap is that it doesn't describe what 'get' returns, which would be useful given the absence of an output schema.

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 100%, so the baseline is 3, but the description adds genuine value by enumerating the concrete event type values (watchlist.company_changed, etc.) that the schema only refers to generically as 'event types'. It does not clarify the url parameter, but the schema handles that.

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 states a specific verb set (configure/view/remove) and the exact resource (webhook for watchlist event notifications), and it correctly expands the name beyond the narrow 'set' implied by the tool name. No sibling tool shares this scope, so an agent can identify it unambiguously.

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 action enum in the schema carries the get/set/delete routing, and the description reinforces the three modes implicitly. However, it offers no explicit when-to-use guidance, prerequisites, or tradeoffs for choosing this over alternatives (there are effectively none), leaving usage to inference.

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