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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds that results are 'current' and scoped to one public section, but says nothing about pagination, result volume, or freshness window; with an output schema present, that omission is tolerable but not rich.

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 sentence, front-loaded with what the tool returns and closed with the input constraint. No filler, no 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?

An output schema exists so return values need not be described, and annotations cover the safety profile. The provenance rule for 'section' is the critical missing piece an agent would otherwise have to guess, and it is present; only the identifier format remains slightly ambiguous.

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 0% and there is no enum, so the description carries the burden for the single 'section' parameter. It supplies the key constraint (must be a valid section identifier sourced from birminghammail_sections and must be public), which meaningfully complements the bare 'string' in the schema, though it does not clarify slug vs. display-name format.

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+resource: current headlines for a single named section of the Birmingham Mail. It is clearly distinguishable from birminghammail_article and birminghammail_sections, though it does not explicitly contrast itself with birminghammail_news.

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?

Explicitly tells the agent where the required argument must come from ('section must come from birminghammail_sections'), which is a concrete routing rule to a sibling tool. It does not state when to prefer this over birminghammail_news, but the usage context is clear.

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