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

Annotations already indicate readOnlyHint=false, destructiveHint=false, but the description adds significant behavioral detail: it only proposes now, books later automatically only with owner approval, and over-ceiling weeks book nothing and notify. It also states the recurring nature and the ceiling constraint. 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 dense but well-structured, front-loading the core purpose and then explaining the approval and ceiling mechanics. Some redundancy exists ('nothing books now' and 'nothing ever books without approval'), but it remains efficient. It is appropriately sized for the complexity of the 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?

For a tool with 7 parameters, nested objects, and no output schema, the description covers the overall workflow and key constraints (approval, ceiling, recurrence). It does not explain the quote/book payload structure, but the schema already does. The description adequately complements the schema for an agent to understand the tool's purpose and invocation flow.

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%, so each parameter is already documented in the schema. The description does not elaborate on parameter-specific details but does reference the ceiling concept. Since the schema covers parameter meaning thoroughly, the description adds marginal value beyond schema, so baseline 3 is appropriate.

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 clearly states the tool sets up a recurring weekly shipment automation, with specific behavior: re-quoting and auto-booking under a ceiling, after owner approval. It explicitly differentiates itself from immediate booking tools by stating 'THIS TOOL ONLY PROPOSES — nothing books now'. The verb 'set up' and resource 'recurring lane' are precise, and the description distinguishes it from siblings like book or batch_book.

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 provides explicit guidance on when to use: for standing orders needing weekly re-quoting and auto-booking, and clarifies it does not perform immediate booking. It notes the approval requirement and over-ceiling behavior. Although it does not name specific alternative tools, the context makes it clear this is for automation versus one-off bookings, and the 'Auth required' note adds operational context.

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