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

With no annotations, the description carries the full burden; it does disclose a real behavioral trait, that approved agent actions append requested_by_token_id to any event, and it hints at return shape (payload keys and types). It never states that this is a read-only, zero-side-effect lookup, nor anything about auth or scoping, which for a no-annotation tool is a meaningful omission.

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, zero waste, and the core definition is front-loaded ahead of the requested_by_token_id caveat. Each sentence adds distinct information.

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 zero-parameter, no-output-schema catalog, the description conveys enough: what the catalog enumerates and one payload-modifying rule. A little more on how the result is organized or whether it is static would make it complete, but an agent can call this confidently as written.

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?

The tool takes zero parameters, so there is nothing to disambiguate and the baseline of 4 applies. The description correctly imposes no parameter expectations on the caller.

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 resource and scope: a catalog of every event a webhook can receive, including payload keys and types. That distinguishes it implicitly from sibling tools like webhooks_create, webhooks_list and webhooks_deliveries, though it never names an alternative 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?

Use is only implied: an agent can infer you consult this before subscribing webhooks or parsing a delivery. There is no explicit 'use this when' framing and no mention of the sibling tools that create, list, or replay webhooks, so routing is left to inference.

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