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

The description adds that English is the fallback for untranslated fields, a behavioral detail beyond the annotations, and mentions the API scope requirement. Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description does not contradict annotations and provides some extra context, but it omits details about pagination or return structure.

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 extremely concise, using three short statements. It front-loads the purpose and includes only necessary information (scope requirement and language fallback). There is no filler or redundant content, making it efficient.

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?

Given that the schema fully documents parameters and there is an output schema, the description provides the core purpose and a scope requirement. However, it does not elaborate on what entities the feed tracks or how to use the cursor for pagination, though these are likely covered by the schema. It is adequate but not rich, leaving some ambiguity about the exact nature of the feed.

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 covers all parameters with descriptions (100% coverage), so the baseline is 3. The description adds no additional parameter semantics; the language fallback mentioned in the description is already stated in the 'lang' parameter description. No extra value is provided beyond 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 identifies the tool as an 'Incremental change feed' and mentions it requires the stories API scope, which ties it to stories and distinguishes it from siblings like stories_list (current state) and stories_get (single item). However, it does not explicitly state the verb (e.g., 'list') or what entity the changes refer to, so it is clear but not fully specific.

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?

There is no explicit guidance on when to use this tool versus alternatives. It does not mention any sibling tools or conditions for selection. The name implies it is for incremental updates, but the description does not instruct the agent to use it for polling changes or syncing, leaving the decision to inference.

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