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

Annotations already state readOnly and idempotent, but the description adds substantial return-behavior detail: newest-first ordering, omission of checks with no detected changes, the specific diff fields (line counts, sample, title/meta/status-code before/after), and an explicit non-fabricated similarity statement. This goes well beyond the safety annotations.

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 first sentence front-loads what the tool returns and its ordering, and the second sentence explains entry contents. Both sentences carry useful information, especially because no output schema exists.

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?

With no output schema and minimal annotations beyond safety, the description supplies the return-shape details an agent needs: ordering, excluded records, and the fields in each diff entry. It is complete for invoking the tool and interpreting results.

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 are documented in the schema, including limit's default and cap. The description does not add new parameter syntax or format guidance, so baseline 3 is appropriate.

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 names the exact resource (detected changes for one monitored competitor URL) and its ordering (newest first), which distinguishes it from monitor-management siblings like list_competitor_monitors. It stops short of explicitly naming an alternative tool, so it is clear but not fully sibling-routing.

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: call this after obtaining a targetId to inspect that monitor's change history, and no-change checks are excluded. There is no explicit when-to-use condition or a named alternative to use instead, so guidance is only implied.

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