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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds nothing beyond that — no error/not-found behavior, no note about the ID pattern, no return context — but it also does not contradict the annotations.

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?

Very short and front-loaded, with the verb leading. The two lines ('Retrieve a story' / 'Fetch a single Story by ID') are largely redundant restatements of each other, which is the only wasted space.

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 getter with complete annotations, the description covers the essentials. Since no output schema exists, some statement about what is returned (or what happens for an unknown/invalid ID) would have been warranted, and it is absent.

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 0%, so the schema only supplies a name and a regex pattern for storyId. The description adds the meaning 'by ID' (an identifier lookup) but no format, source, or example of a valid ID beyond what the pattern already enforces. With a single self-describing parameter this is minimally adequate.

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 ('Retrieve a story', 'Fetch a single Story by ID'), and the word 'single' implicitly contrasts with listStories. It does not explicitly name a sibling, but the operation 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?

'By ID' implies the precondition that the caller already holds a storyId, which is usable guidance. However, there is no explicit when-to-use, no when-not-to-use, and no named alternative among the many story-related siblings (listStories, updateStory, getPost, getVideo).

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