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

With no annotations, the description carries the full burden. It does disclose a genuinely useful non-obvious trait: the monitor reports edits to existing items with field-level diffs, 'unlike most tools.' But it omits mutation-side behavior such as duplicate-monitor handling, permissions, and whether the monitor persists indefinitely.

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?

Two tight sentences with no filler. The core action is front-loaded and the differentiator (edit detection with diffs) follows immediately.

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?

There is no output schema, so the description should ideally indicate what creation returns (e.g., a monitor id). It covers what is created and the key behavioral differentiator, but leaves return/handle semantics and notification behavior after creation unaddressed.

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 coverage is 100%, so all four parameters (url, name, keywords, intervalSeconds) are already documented in the schema, including the enum meanings. The description adds no parameter-level detail beyond what the schema provides, 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?

States a specific verb (Create) and resource (change monitor) with the accepted scope (RSS, Atom, JSON Feed URLs). The create vs. check/list distinction from siblings is clear from the verb, though no sibling is named explicitly.

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 by the domain: use this to set up a monitor, use check_feed to inspect one. However, there is no explicit when-to-use statement, no mention of alternatives, and no prerequisites (e.g., auth, whether the feed must be publicly reachable).

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