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

With no annotations, the description carries the full burden, yet it omits the safety profile (read vs write), the response shape, pagination, and any rate-limit or auth notes. It hints at delta/incremental semantics but never confirms them or explains what a 'change' actually contains.

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?

It is a single short sentence with no waste, so length is appropriate. However the em-dash construction reads as two fragments rather than a front-loaded purpose statement, and the brevity comes at the cost of substance.

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 1-parameter tool with no annotations and no output schema, the description should define what is compared, the default window, and the return content. None of these are present, so an agent lacks the context to call it confidently.

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% and identifies the single parameter as a 'YYYY-MM-DD' string, so the schema does the heavy lifting. The description adds no format, default, or boundary semantics beyond it — notably it is silent on what happens when the optional 'since' is omitted.

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 largely restates the name ('changes' → 'What changed since a day') with an added hint about keeping a local copy in sync. It never identifies what resource is being compared (websites? sellers? the whole workspace) and offers no differentiation from the eight sibling tools, several of which list/check the same domain entities.

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 phrase 'keep a local copy in sync' weakly implies the sync use case, but there is no explicit when-to-use, no when-not-to-use, and no named alternative among siblings. An agent cannot tell whether this supersedes or complements 'batch' or the various list_* tools.

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