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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered; the description adds genuinely new behavior — the result is a weekly diff ordered newest-first, and it is a cheaper alternative to re-reading the catalogue. It does not disclose result-size limits or pagination, which keeps it from a 5.

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?

One front-loaded sentence states the return content first, then the filters and their purpose. The em-dash filter list is dense but every clause earns its place; no filler or redundancy.

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 7 optional parameters and no output schema, the description carries the burden of describing the return shape, and it does so ('publications added and removed, and price changes, newest first'). It omits any mention of result volume, limits, or default window when no filters are supplied, which is the main remaining gap.

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 every one of the 7 filters is already documented in the schema, so the baseline is 3. The description restates the same filters (date, max price, categories, min DA, additions-only, price-drops-only) and adds intent rather than new parameter syntax, so it does not meaningfully exceed the schema.

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 states a specific verb and resource: it returns the delta of each weekly catalogue sync — publications added/removed plus price changes — and gives the ordering ('newest first'). This is clearly distinguishable from siblings like search_placements or compare_placements, which operate on the current catalogue rather than its changes.

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?

It gives a clear context of use ('watch for new outlets or cheaper placements without re-reading the whole catalogue') and enumerates the filter modes that map to that intent. It stops short of naming an explicit alternative tool or stating when not to use it, so it is clear but not fully routing.

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