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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds nothing beyond purpose: it does not say what happens when the ID does not exist or belongs to another workspace, nor anything about the shape of the result — with annotations carrying the burden, that thinness is a real gap.

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?

One short sentence with the resource and lookup key front-loaded and no filler. It is efficient, though the terseness borders on under-specification rather than exemplary structure.

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 an output schema present, return values need no explanation, and annotations plus a fully documented single parameter cover most of the rest. Still missing is the not-found/miss behavior and whether the record must be in the caller's scope, which an agent would want before calling.

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% and the single parameter's schema text ('Record ID from list_records') already tells the agent where IDs come from. The description's 'by ID' adds no syntax, format, or sourcing detail 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?

States a specific verb and resource ('Returns one income or expense record') plus the lookup key ('by ID'), so the agent knows exactly what it fetches. The word 'one' implicitly contrasts with the sibling list_records, though it never names it explicitly.

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: fetch a single record when you already have its ID, versus list_records for enumeration. There is no explicit when-to-use/when-not guidance, no mention of what to do if the ID is unknown, and no named alternative.

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