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

The annotations include readOnlyHint: true, which already discloses the read-only nature. The description adds context about the types of updates returned, which is useful but not deep behavioral detail. It does not mention pagination, sorting criteria, time range for 'latest', or any output format. Since the annotation covers the safety profile, a score of 3 is appropriate; it adds some value but lacks richer behavioral context.

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 description is a single, front-loaded sentence: 'Get latest SFC regulatory updates' followed by a colon and a list of content types. Every word earns its place, with no redundancy or filler. It is highly concise and well-structured.

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 simple read-only tool with two optional parameters, the description covers the core purpose and content types. However, it omits the output format (e.g., does it return full documents or summaries?), does not define the recency window for 'latest', and offers no mention of how to narrow results using the category parameter (though the schema covers this). The lack of an output schema raises the need for more description of return values, which is absent. Thus it is adequate but not fully complete.

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 schema provides a description for 'count' but not for 'category'. The tool description enumerates the category values ('circulars, enforcement news, VATP developments, consultation papers') which corresponds directly to the 'category' enum, adding semantic meaning beyond the bare enum values. For 'count', the schema already describes 'Number of results, 1-10', so the description doesn't need to repeat it. This partial compensation for the 50% schema coverage justifies a 4.

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 uses a specific verb 'Get' and clearly identifies the resource as 'latest SFC regulatory updates', followed by a concrete list of content types (circulars, enforcement news, VATP developments, consultation papers). This differentiates it from sibling tools like search_enforcement, which focuses on searching enforcement actions specifically, and query_regulation, which likely retrieves regulatory text.

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 description only states what the tool does, with no guidance on when to use it over alternatives. It does not mention that for specific enforcement case searches one might use search_enforcement, nor does it describe any exclusions such as 'for point-in-time queries, use query_regulation'. The intended use case (e.g., monitoring recent changes, staying compliant) is implied but not explicit.

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