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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds real value by disclosing the response contents and the deep link, but it says nothing about what happens when the identifier is not found, and it leaves idempotentHint=false unexplained for an operation that reads a single record.

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?

Two sentences, zero filler. The return payload is front-loaded and the input form follows, so an agent gets the important information first.

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?

With no output schema, the description correctly carries the burden of enumerating return fields, and it does so thoroughly for a one-parameter read tool. The only shortfall is the absence of any statement about not-found or cross-workspace behavior, which is minor here.

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 100% and the single parameter already documents both accepted forms with the 'AR-15' / '15' example. The description's sentence 'Accepts the friendly number or the internal id' restates the schema rather than adding new meaning such as case sensitivity or prefix handling, 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?

States a specific verb and resource ('Return one approval request') and enumerates exactly what comes back: status, submitted field values, requestor, approver decisions, and a link. The word 'one' plus the enumerated payload makes it distinguishable from list_approval_requests and get_request_activity without opening any schema.

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?

Usage is only implied by the singular 'one approval request', which suggests fetching a single known record rather than browsing. There is no explicit statement of when to prefer this over list_approval_requests or get_request_activity, and no mention of prerequisites or failure behavior for an unknown identifier.

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