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

The annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is fully covered by structured data. The description's only value-add is 'with delivery health diagnostics', which signals that the response carries computed health data beyond a raw webhook record — a useful but thin behavioral hint.

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?

One sentence, front-loaded with the verb and resource, with no filler. The trailing clause 'with delivery health diagnostics' is slightly vague but earns its place by hinting at response content.

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 single-parameter read tool with rich annotations and an output schema, the description covers what is needed: what is fetched, by which key, and that health diagnostics are included. Return shape and safety semantics are handled by the structured fields.

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 a single parameter and 100% schema description coverage (including UUID format and provenance from problee_list_webhooks), the schema does all the work. The description adds only 'by id', which restates the schema rather than enriching it.

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 names a specific verb ('Fetch') and a specific resource ('a single webhook delivery target by id'), so an agent immediately knows this is a single-record lookup rather than a listing. It implicitly separates itself from kellian_list_webhooks and kellian_discover_webhooks by the word 'single', but never names those siblings explicitly.

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 when-to-use guidance in the description: no statement of preconditions, no routing to the list tool for discovery, and no exclusion of alternatives. The only hint that an id must come from kellian_list_webhooks lives in the input schema, not the description.

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