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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds the useful scope fact that results are limited to the authenticated user, but says nothing about pagination, match recency window, or rate limits.

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?

Front-loaded with the core action and appropriately short at three sentences. The second sentence partly restates the first ('keyword alerts and recent matches' vs. 'alert configurations and announcements that matched their keywords'), which is mild redundancy rather than a structural flaw.

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?

An output schema exists, so return-value detail is not the description's burden, and annotations cover the safety profile. With one optional boolean parameter, the description supplies enough context (who the data belongs to, what triggers use) for correct invocation.

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% and the single boolean parameter include_matches is documented in-schema with its default. The description's mention of 'recent matches' implies the flag but adds no syntax or behavioral detail beyond the schema, so the baseline of 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?

States a specific verb and resource ('Get the authenticated user's keyword alerts and recent matches') and scopes it to the calling user's own data. It does not distinguish itself from nearby siblings such as get_announcement_alerts or list_alert_subscriptions, whose subject matter overlaps with the 'alert configurations' it claims to return.

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?

The third sentence gives explicit trigger conditions: 'Use when asked about their alerts, keyword notifications, or what announcements matched their keywords.' That is clear routing context, though it offers no exclusions or named alternatives when a sibling would be the better choice.

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