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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that: it discloses the return artifact (a pre-filled link), the human-in-the-loop handoff, and the duplicate-listing check, all of which the annotations cannot convey.

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?

Five tight sentences, front-loaded with the most important fact (no creation) and the return value. Every clause earns its place; nothing is redundant with the title or schema.

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 5-parameter tool with full schema coverage, full annotations, and no output schema, the description is nearly complete: it covers purpose, workflow, and the duplicate-check behavior. It could optionally mention link expiry or auth prerequisites on the destination form, but nothing essential is missing.

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% and each parameter already carries a description, so the schema does the heavy lifting. The description only restates which fields are pre-filled (name, website, optional category/country/city), adding marginal meaning over the schema. 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?

States a specific verb and resource ('prepare...listing submission link') and immediately negates the wrong mental model with 'Does NOT create anything.' This clearly separates it from sibling mutators like prepare_listing_claim, prepare_upgrade, and post_job, which is exactly the differentiation an agent needs.

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 explains the workflow – the tool returns a pre-filled link, the user signs in, completes the remaining fields and submits themselves – which tells the agent when this tool is the right call versus doing nothing. It does not explicitly name an alternative tool or when-not-to-use condition, so it stops short of a 5.

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