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

With no annotations, the description carries the full burden, and it does disclose the auth requirement and the push/poll delivery options. It says nothing about lifecycle behavior — whether duplicate subscriptions are allowed, how a subscription is removed, idempotency, or what the response contains — which matters for a state-creating tool.

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?

Three short sentences, effect stated first, delivery options and prerequisite following. No filler, nothing buried.

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?

There is no output schema, yet the description never says what is returned — notably the subscription identifier that check_subscription polling presumably needs. For a create tool with a nested-parameter object and no annotations, that is a meaningful omission, though the core call mechanics are covered.

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 100%, including the nested query object, so the schema already documents every parameter in detail. The description only restates the query's relationship to search fields and the two optional extras, adding no syntax or format detail beyond the schema; baseline 3 applies.

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 effect — receiving notifications of future posts matching a query — and ties the query shape to the search sibling, with the title reinforcing it as a saved standing query. It does not fully contrast with search (does this also search now?), but the create-vs-subscribe distinction is legible.

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?

It names the two delivery modes (webhook_url push vs polling with check_subscription) and a prerequisite (api_key), which gives clear context for choosing this tool. There is no explicit when-not guidance, e.g. when to use search instead of subscribing.

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