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

Annotations only cover safety (readOnlyHint=true, openWorldHint=false); the description adds genuinely useful behavior beyond them: this is a stateful cursor poll ('events since your last poll, then the cursor advances') and requires no public endpoint. It does not mention rate limits or what happens when no new events exist.

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 dense sentences with the core behavior (cursor advance) front-loaded and the usage condition second. 'no public endpoint required' is mildly redundant with the webhook framing, keeping it just under maximum.

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 compensates by naming the returned fields (tool id, severity, link) and disclosing the cursor-advance side effect. Coverage is solid, though it omits what an empty poll returns and whether the cursor is per-token or global.

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%, so both the token and limit parameters are already documented in the schema, making 3 the baseline. The description reinforces the token's polling semantics but adds no format or edge-case detail for limit beyond the schema's default of 50.

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 (fetch) and resource (new reliability alerts) scoped to a subscription token, and names the sibling watch_tool as the setup step. An agent can tell this apart from siblings like watch_tool/unwatch without opening a schema.

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?

Gives an explicit trigger: 'Use this after watch_tool without a webhook to react to outages/recoveries.' That names both the precondition and the alternative mechanism (webhook), though it does not mention unwatch as the teardown counterpart or state what happens if polled before watching.

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