bookshelf_grab_queue_item

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

Annotations already indicate this is not read-only and not destructive, but the description adds little beyond that. It mentions 'now' implying immediate effect, but does not disclose what happens to the queue item (e.g., removed, marked as grabbed), potential failure conditions, or any side effects. The description carries minimal behavioral context beyond what annotations provide.

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 description is a single sentence of eight words, making it very concise and front-loaded. It does not waste words, but it is so terse that it borders on under-specification, which is partially penalized in other dimensions. Still, as a structure, it is appropriately sized for a simple one-parameter tool.

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?

Given the tool has one parameter and an output schema, the description is extremely thin. It lacks any context about the effect of the operation, when it should be used, or what the output represents. For a mutation tool with side effects, this is insufficient for an agent to select and invoke it confidently. The presence of an output schema does not excuse the lack of context about the operation itself.

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?

With 0% schema description coverage, the description must compensate, but it only says 'a single queue item' which weakly implies the 'id' parameter refers to a queue item ID. It does not clarify what kind of id is expected or how it relates to the queue (e.g., queue row id vs. book id). The added semantic value over the schema is minimal.

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 uses a specific verb 'grab' to indicate starting a download and identifies the resource as a single queue item, which distinguishes it from bulk operations like bookshelf_grab_queue_bulk. However, 'grab' is somewhat colloquial and could be clearer about the exact action, so it doesn't fully achieve the precision of a 5.

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?

The description implies this is for acting on a single queue item ('single', 'now') but gives no explicit guidance on when to choose this over alternatives like bulk grab, delete, or list operations. It lacks any statement of context, prerequisites, or exclusions, leaving the agent to infer usage from the name alone.

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