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

With no annotations, the description must disclose behavioral traits, but it only states that notices are marked as read and gives a 100-item limit. It omits key behavioral details such as whether the operation is idempotent, whether it requires specific permissions, what happens to already-read notices, or what the response contains. This is a significant gap for a mutation tool with zero annotation coverage.

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?

The description is a single, front-loaded sentence that immediately conveys the action and its scope limit. There is no extraneous content, and every word serves a purpose.

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 mutation tool with no annotations, no output schema, and no usage guidance, the description is incomplete. It should explain when to use this versus agent_notices, what the effect is, and any prerequisites or side effects; currently, an agent lacks the context needed to invoke it confidently.

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 the schema fully documents both parameters (ids and agent_key) with descriptions. The description adds a cap of 100 items, which is already reflected in the schema's maxItems constraint, and does not provide additional parameter semantics. Baseline 3 is appropriate when the schema does the heavy lifting.

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?

The description states a specific verb and resource: 'Mark ... notices as read,' which clearly conveys the purpose of acknowledging notices. It implies a state mutation but does not explicitly differentiate from the read-only sibling agent_notices; the name 'agent_notices_ack' and the title reinforce the action, so purpose is clear but sibling routing is absent.

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?

There is no guidance on when to use this tool versus agent_notices or other notice-related siblings. The description provides no context, no exclusions, and no alternatives, leaving the agent to infer usage entirely.

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