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

Annotations already declare destructiveHint=true and idempotentHint=true, and the description adds meaningful context: unacknowledged events are retained 30 days, and acknowledging suppresses re-offering. However, it never clarifies what 'destructive' actually means here (permanent removal vs. merely hiding) or whether the action can be undone, leaving a real gap given destructiveHint=true.

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 short sentences with the core effect front-loaded and the retention caveat appended; nothing is wasted or padded.

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 two-parameter tool with no output schema, the description covers the source of inputs, the effect, and the retention window. Minor gaps remain around failure behavior and the exact meaning of destruction, but an agent has enough to call it correctly.

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%: agent_id is documented in the schema, while event_ids is not, and the description only notes that the events come from get_replies. It adds provenance but says nothing about batch limits (schema caps at 100) or behavior for unknown ids.

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 ('mark as handled') and resource ('events'), and names the sibling tool that produces those events (get_replies), so an agent can tell what it operates on. It stops short of explicitly contrasting itself with other siblings, but the purpose is unambiguous.

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?

Implies the workflow clearly: acknowledge events returned by get_replies once handled so they are not offered again. There are no explicit exclusions or alternatives (e.g. what to do instead of acknowledging), which keeps it from a 5.

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