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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is fully covered by structured data. The description's one contribution is 'with delivery health diagnostics', which usefully signals that the response carries derived health information beyond the raw target config. It does not mention error behavior for unknown or deleted ids, which for an open-world fetch would be worth a clause.

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?

A single front-loaded sentence with zero filler, and the health-diagnostics qualifier is appended after the core purpose rather than buried. There is nothing redundant, though the brevity leaves identified gaps elsewhere rather than being maximally sized for a one-parameter tool.

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 no explanation, and annotations plus a fully documented single parameter cover the mechanical call requirements. Against a crowded sibling set with three separate webhook-related tools, however, the absence of any disambiguation or error-condition note leaves the definition only minimally complete.

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%; the only parameter is documented with a UUID format, a strict pattern, and its provenance ('from problee_list_webhooks'), so the schema carries the full burden. The description adds no meaning beyond 'by id', which is the correct baseline given complete schema documentation.

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 specific verb and resource ('Fetch a single webhook delivery target by id') plus a scope cue, and the singular/by-id framing implicitly separates it from the batch-style problee_list_webhooks and problee_discover_webhooks siblings. It stops short of naming those siblings explicitly, so the differentiation is inferable rather than stated.

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 at all: nothing says to call this when you already hold an id versus calling problee_list_webhooks to enumerate or problee_discover_webhooks to search. The only routing hint ('from problee_list_webhooks') lives in the schema parameter description, not the tool description.

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