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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds that the payload includes event subscriptions and delivery settings, which is useful scoping context but not deep behavioral detail such as shape or freshness.

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 well-formed sentence with the operation front-loaded and no filler. It is tight, though slightly thin given the retrieval has no output schema backing it.

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?

With no output schema, the description sensibly names the returned sections, so an agent knows roughly what comes back. However, it leaves both required parameters undocumented in schema and prose, which is a meaningful gap for a two-parameter lookup.

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 description coverage is 0% and neither appId nor endpointId is explained anywhere. The description only implies 'endpoint' via the noun phrase, and says nothing about how appId scopes the lookup or what identifier formats are accepted.

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?

Names a specific verb ('Read') and resource ('customer webhook endpoint') and even enumerates what is returned (event subscriptions, delivery settings). It is distinguishable from the list_endpoints sibling by being a singleton read, though it never states that distinction 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?

No when-to-use guidance, no prerequisites, and no mention of the obvious alternatives (list_endpoints for enumeration, update_endpoint for modification, delete_endpoint for removal). The usage is only inferable from the verb.

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