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

Annotations already declare readOnlyHint=true, so the read-only nature is covered. The description adds that the tool is paginated and supports a status filter, which are behavioral details beyond the annotation. However, it does not disclose what fields the returned list contains or whether pagination metadata (e.g., total count) is included. Given the annotation already covers safety, a 3 is appropriate – the description adds some context but not rich behavior.

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 sentence with no filler. It front-loads the core purpose ('Paginated monitors') and immediately states the optional filter. Every word earns its place – it is concise and well-structured.

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 list tool with no output schema, the description covers the essentials: pagination, optional filter, and the resource being listed. It does not mention return format or sorting, but given the tool's simplicity and the read-only annotation, this is adequate. The presence of sibling tools like get_monitor implies the list likely returns summaries, and the description is sufficient for an agent to invoke it correctly.

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%, so all three parameters (page, limit, status) are already documented in the input schema. The description mentions 'paginated' and 'status filter', but these are redundant with the schema's parameter descriptions. It adds no new semantic meaning beyond what the schema already provides, so the baseline of 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 clearly states the action ('list monitors') and the scope ('in the project'), plus the optional status filter. It distinguishes from get_monitor (singular) by plural 'monitors', but does not explicitly differentiate from search_monitors_by_name. Still, the verb 'list' with pagination implies a bulk listing operation, making the purpose clear enough.

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 provides no guidance on when to use this tool versus alternatives like search_monitors_by_name or get_monitor. It does not mention exclusions or conditions. An agent would have to infer that this is the tool for enumerating all monitors with filters, but no explicit when-to-use or when-not-to-use guidance is given.

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