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 only added content is a pointer that describe_operation provides native request schemas, which has modest navigational value but discloses nothing about behavior, errors (e.g. 404 on unknown id), or auth requirements.

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 single meaningful sentence is duplicated word-for-word, wasting half the description. The remaining sentence is metadata (operation ID) that does not help an agent decide or call correctly.

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 nested-object, two-parameter lookup tool with 0% schema description coverage and no output schema, the description supplies nothing about what the returned recurring expense looks like or how to form the request. Annotations cover only safety, so the description's silence leaves the definition substantively incomplete.

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% for two parameters, and the description never explains that `params.id` is the recurring-expense identifier or what the free-form `query` object is for. The lone '`:id`' fragment in the path is the only hint, and it does not compensate for the coverage gap.

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 is essentially the raw endpoint path repeated verbatim twice: "GET /api/recurring-expenses/:id". This signals a fetch-by-identifier for the recurring-expenses resource, but it is a restatement of the title rather than an explanation. There is no differentiation from the sibling get_recurring_expenses_512adadc5684c46099999aff (the list endpoint) or any statement of what a recurring expense record contains.

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?

No when-to-use, when-not-to-use, or alternative-tool guidance is provided. An agent gets no help choosing between this tool and the plural list tool or the execute_read/describe_operation wrappers in the same family.

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