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

Annotations already cover the safety profile (read-only, non-destructive, not open-world), and the description adds genuinely useful context beyond that: the content provenance (public sector, revenue.ie) and a concrete attribution obligation when citing results. It does not discuss freshness or volume of the changelog, but the licensing/citation guidance is real added value.

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?

Front-loaded with the purpose in the first sentence, then usage, then licensing. The licensing sentence is long and somewhat detailed for a tool description, but it carries actionable operational instructions rather than filler.

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 parameterless read-only tool with an output schema, the description covers what it returns, when it is useful, and how to handle the results' attribution. Nothing needed to call it correctly is missing.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 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 and resource ('Get the Revenue eBrief changelog') and clarifies the resource as 'recent updates to Revenue guidance and Tax & Duty Manuals', which separates it from document-retrieval siblings like get_revenue_document_text. It does not explicitly name an alternative, but the scope is unambiguous.

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?

'Useful for checking what Revenue guidance has changed recently' gives an implied usage context but no when-not-to-use guidance and no reference to alternatives such as search_revenue_documents or get_revenue_document_text. Adequate but leaves routing to inference.

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