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

Annotations already declare destructiveHint=true and readOnlyHint=false, but the description adds meaningful behavior beyond them: 'Their history stays on the site' clarifies what is preserved, and 'nothing draws their morning but the world's' describes the resulting morning experience. This is useful behavioral context for a destructive action.

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 short, but the poetic construction ('nothing draws their morning but the world's') obscures meaning rather than front-loading the operational condition in plain language. It is concise but not as clear as it could be.

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 zero-parameter destructive action with an output schema and annotations, the description covers the essential effect and data retention. The ambiguous morning sentence leaves minor uncertainty, but the agent can still understand what the tool does and when to call it.

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?

The tool has zero parameters, so there is no parameter semantics burden and the baseline score of 4 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?

The phrase 'The reader's brief dropped' communicates removal of the brief, and the tool name reinforces it, but the metaphorical wording avoids a direct verb like 'delete' and does not explicitly contrast with save_brief or amend_brief. The intent is inferable but not crisp.

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 description gives an explicit condition: 'only when they asked for that in words,' which tells the agent to invoke this only on explicit user request. It does not name alternative tools, but the when-to-use exclusion is clear.

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