create_webhook

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

With no annotations, the description carries the full burden, but it does disclose one critical behavior: the HMAC signing secret is returned once and must be stored immediately — a genuinely useful, non-obvious side effect. It omits whether the subscription is active on creation, delivery retry behavior, or what verification the target URL needs.

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 tight sentences, front-loaded with the action and immediately followed by the most time-sensitive detail (one-time secret). Nothing is wasted.

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?

The return-value and secret handling are covered well despite no output schema, but for a 4-parameter tool with a nested filter object, the description says nothing about how filtering works or how required parameters are sourced (e.g. feedId from list_feeds). Adequate but with clear gaps.

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 only 50% and the description adds nothing about parameters — the nested 'filters' object (drivers, constructors, positions) and 'webhookMethod' default are entirely undocumented outside the schema, and even there only partially described. The description fails to compensate for the coverage gap.

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?

Specific verb+resource: 'Register a new webhook subscription' clearly identifies a creation operation. It is distinguishable from update_webhook/delete_webhook by the verb, though it 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?

No guidance on when to use this versus update_webhook, test_webhook, or rotate_webhook_secret, and no prerequisites stated. Creation is implied by the verb only.

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