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

Annotations already declare destructiveHint=true, idempotentHint=true, readOnlyHint=false and openWorldHint=true, so the bar is lower. The description still adds real behavioral value: it states that checks stop immediately and, importantly, that ongoing incidents stay open, which is the non-obvious consequence an agent needs before pausing a monitor. It stops short of noting reversibility guarantees or auth requirements.

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 short sentence with the action and its two key consequences front-loaded; no filler, no redundancy. Every clause carries information.

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 simple two-parameter state-change tool with no output schema and full annotation coverage, the description covers the core effect and the incident side effect. It could be marginally stronger by stating that pause is reversible/idempotent in prose or what the call returns, but nothing essential is missing for correct invocation.

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 (monitor_id, project_id) are documented in the schema, including the 'see whoami' hint for project_id. The description contributes only 'by ID', adding no meaning beyond the schema, so the 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?

The description gives a specific verb+resource ('Pause a monitor by ID') plus the concrete effect ('its checks stop until it is resumed'), which makes clear it is the inverse of resume_monitor without naming it. An agent can distinguish it from list_monitors/get_monitor/update_monitor from the description alone.

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?

Usage is implied rather than stated: 'until it is resumed' hints at the pause/resume lifecycle and points at resume_monitor as the counterpart, but there is no explicit when-to-use, when-not-to-use, or named alternative, and no mention of prerequisites such as permissions or paused-state conflicts.

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