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

Annotations already establish this is non-read-only, non-idempotent, and non-destructive. The description adds useful behavioral context beyond annotations: only documents you own can be bound, an lp_ API key is required, the result has a landing page and chapter navigation, and there is a 200-chapter limit. No contradictions with annotations.

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 two tight sentences with no filler. The core action is front-loaded, followed by the key constraint and prerequisite. Every phrase earns its place.

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 output schema, fully described parameters, and annotations, the description covers the important operational constraints: ownership, API key requirement, and chapter limit. It does not explain error behavior for unowned documents, but that is not essential for an agent to invoke the tool correctly.

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%, giving a baseline of 3. The description adds meaning beyond the schema by clarifying that documents must be owned and limiting bundles to 200 chapters, which directly refines the semantics of the items parameter. This extra context justifies a 4.

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 and resource: 'Bind documents you own into a multi-chapter bundle.' It clearly distinguishes this from sibling tools, which all operate on individual docs rather than creating a bundle. The scoping to owned documents and multi-chapter bundles removes ambiguity.

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 gives clear context for when to use the tool — creating a bundle from documents you own — and states a prerequisite: requires an lp_ API key. There are no sibling tools for bundle operations, so explicit exclusions are unnecessary, though it does not spell out when not to use it.

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