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

Annotations already declare idempotentHint=true, destructiveHint=false, and readOnlyHint=false, so the safety profile is covered. The description adds only the 100-item cap, which the schema also enforces; it says nothing about behavior for unknown/already-read ids or whether partial success is possible.

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 with no filler and the key scope limit stated up front. It is terse to the point of leaving gaps, but nothing in it is wasted.

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 mutation with full schema coverage and strong annotations, the description is minimally sufficient. However, with no output schema and no mention of the response or partial-failure semantics, an agent still cannot predict what comes back.

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 both parameters are documented in the schema (including provenance: 'from agent_notices', 'from agent_register'). The description adds no syntax, ordering, or constraint detail beyond what the schema already carries, so 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?

Specific verb ('mark ... as read') plus resource ('notices') plus scope ('up to 100', 'this agent's'), which is enough to distinguish it from the sibling agent_notices lister. It stops short of explicitly naming the sibling as the source, though the schema hints at it.

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?

No statement of when to use this versus agent_notices or other notice-related siblings, and no prerequisites (e.g., ids must come from a prior agent_notices call). The agent must infer the workflow entirely.

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