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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false, so the safety profile is covered. The description adds useful context beyond annotations: the event timing and a cost of 10 credits (Tier 1). It omits auth requirements, delivery behavior, and how N is set, but with annotation coverage a 3 is appropriate.

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 short, front-loads the event trigger, and uses bracketed tags for group and cost without wasting words. It is appropriately sized, though the unexplained 'N days' is an unresolved detail rather than structural clutter.

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 exists, so return values need not be described. But for a webhook registration tool with three parameters and 67% schema coverage, the description omits how N is configured, what registration entails, and any auth or delivery context, leaving it incomplete.

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 67%, with fields and precision documented in the schema but url undocumented. The description adds no parameter meaning and introduces 'N days,' which has no corresponding parameter, so it neither compensates for the coverage gap nor helps the agent understand inputs.

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 event trigger: fires N days before a Vimshottari mahadasha ends. That distinguishes it from sibling webhooks like astroway_webhooks_dasha_change or astroway_webhooks_retrograde_end. However, it does not explicitly say it registers a webhook or mention the required url, leaving the registration action to the title.

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?

There is no explicit when-to-use guidance, no mention of alternatives among the many webhook siblings, and no prerequisites. The description also references an undefined 'N days' lead time without explaining how it is configured.

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