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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description still earns credit by disclosing the required 'offer' permission scope, the underlying endpoint, and the shape of the returned data.

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 short sentences, zero filler, with the resource identification front-loaded ahead of the scope requirement and endpoint detail.

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 single-record read with fully documented params and no output schema, the description adequately notes what comes back (positions and totals). Minor gap: no mention of not-found/404 behavior or error semantics.

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%, including the note that the id comes from smallinvoice_list_offers and the 'with' expansion example, so the schema carries the parameter semantics and the description adds nothing further beyond 'by id'.

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 ('One offer (quote) by id'), and adds what the payload contains ('its positions and totals'), which distinguishes it from smallinvoice_list_offers at a glance.

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: fetching the id returned by smallinvoice_list_offers is hinted at in the schema, and the required 'offer' scope is stated, but there is no explicit when-to-use or when-not versus the list/get siblings.

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