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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorld=false, so the safety profile is covered. With no output schema present, the description earns credit for disclosing the return shape (summary, scores, main subject, and source records with outlet, link, date, kind), which is genuinely useful context an agent cannot get elsewhere.

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?

A single sentence with no filler that front-loads the core object and then enumerates the returned components. It is tight and readable, though it could better organize the id/locale relationship that currently only appears in the schema.

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 low-complexity single-fetch tool, the annotations cover safety, the schema fully covers both parameters, and the description covers the return contents in the absence of an output schema. The missing piece is usage routing versus latest_changes/search_changes, which prevents a top score.

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%: the id parameter is documented as coming from latest_changes or search_changes and locale is a fully described enum with a default. The description adds no parameter meaning beyond the schema, so the baseline 3 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?

The title and description together convey that this fetches a single published change and its reporting sources, a specific resource that contrasts with the list-oriented siblings latest_changes and search_changes. However, the description is a noun phrase describing returned contents rather than stating the retrieval verb, and it never explicitly names a sibling it is distinct from.

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 gives no when-to-use or when-not-to-use guidance. The only routing hint ('The change id from latest_changes or search_changes') lives in the input schema, not the description, so the description itself does nothing to steer an agent among the six siblings.

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