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

Annotations already declare the mutation profile (readOnly=false, destructive=true, idempotent=true), so the bar is lower; the description still adds the salient behavior that state is preserved and the action is reversible via resume_reminder. It does not address edge cases (e.g. an already-paused reminder, whether an in-flight call is affected), which is the only real gap for a mutation tool.

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?

Three short lines: purpose first, then the alternative-selection rule, then the single argument. Every sentence carries distinct information and the decision-relevant content is front-loaded.

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 values need not be explained; for a one-parameter, idempotent mutation the description covers intent, the sibling it displaces, the reversal path, and how to supply the argument. Nothing needed to call it correctly is missing.

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 0%, so the schema only gives 'reminder_id: string'. The description compensates by defining the parameter's meaning and its provenance ('from list_reminders'), which tells the agent where to obtain a valid value rather than just the type.

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 (pause) plus resource (reminder) and an explicit statement of effect: it 'stops calling' while 'keeping all its settings intact'. That distinguishes it cleanly from delete_reminder, resume_reminder, and update_reminder without opening any schema.

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?

Explicitly routes the agent: prefer this over delete_reminder 'whenever the user might want it back', and names resume_reminder as the reversal path. Both a when-to-use rule and a named alternative are given, so nothing is left to inference.

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