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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent write. The description adds real value beyond that: the creator must be a workspace owner and the rule may post to an external https webhook such as Slack. It does not say whether duplicate rules are allowed despite idempotentHint=false, or what happens on webhook failure.

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 front-loaded sentence in which every clause carries information: the resource, the accepted event types, the scoping choice, the optional webhook, and the permission requirement.

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 simple three-parameter creation tool with no output schema, the description covers the key decisions an agent must make (event type, project scope, webhook, permissions). Only failure/idempotency behavior for the webhook path is left unclear.

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?

With only 33% schema coverage, the description compensates well: it assigns meaning to project_id ('one project or all' – omitting it targets all projects) and constrains webhook_url to https with a concrete Slack example. It does not clarify the semantics of each event_type beyond restating the enum.

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 and resource ('Create an alert rule for an event') and enumerates the exact event types (crash, killed, rate_limit, deploy_failed), so an agent can distinguish this from update_alert_rule or list_alert_rules at a glance.

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?

'Workspace owners only' and 'on one project or all' give the permission prerequisite and the scoping choice, but the description never names an alternative tool or says when to create versus update an existing rule.

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