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

Annotations already declare this is a non-read-only, non-destructive, open-world action, so the description only needs to add context. It does add one genuinely useful fact — everything is free and openly licensed, nothing is purchased — which rules out payment flows. It does not say whether the push is asynchronous, what happens if the device is unregistered, or whether a duplicate send is created.

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, front-loaded with the action and accepted item types, followed by the licensing constraint. Nothing is redundant or padded.

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 two-parameter send action with full schema coverage, no output schema, and accurate annotations, the description covers the essentials: what can be sent, how it is identified, and that no purchase occurs. Device-specific failure behavior and delivery timing are the only notable omissions.

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 already documents both id and device including the allowed device values and default. The description's '(by its catalogue id)' merely restates the id parameter's purpose, adding no new syntax or format guidance 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?

The description gives a specific verb (send) and enumerates the concrete resource types it accepts (book, children's book, comic, magazine, puzzle book, template) plus the addressing key (catalogue id) and destination (e-reader). That enumeration implicitly separates it from siblings like send_encyclopedia_articles or send_museum_pieces, though it never names those alternatives.

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: an agent can infer it should call this when the reader wants a catalogue item pushed to a device. There is no explicit when-to-use versus when-not, and no routing to related siblings such as search_library or save_for_later for finding or deferring items instead of sending them.

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