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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered and the description does not contradict it. Beyond that, the description adds only that it surfaces link readiness and posting guidance. It does not mention permission requirements for the underlying hosted link, error behavior when the link is off, or latency/auth considerations.

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?

One compact sentence covers the readiness state, the field bundle, and the guidance, with the readiness check front-loaded. The parenthetical field list is efficient. It is a grammatical fragment ('Whether ...'), which slightly weakens the opening, but nothing is redundant.

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 single-parameter, read-only tool with an output schema that already defines the return shape, the description covers what an agent needs: the state it reports, the fields it packages, and its place in the sequence before enable_mls_link. Only the behavior when the link is not yet enabled is left unstated.

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?

There is a single parameter with 100% schema description coverage ('Listing id from list_listings.'), so the schema already carries the meaning and the baseline of 3 applies. The description adds no further detail on listingId format, sourcing, or what happens for an invalid id. Acceptable but no value beyond the schema.

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 enumerates concrete contents: MLS link readiness, copy-ready MLS fields (video link, address, price, facts, description), and step-by-step posting guidance. That is specific enough to distinguish it from siblings like get_listing_status or get_listing_links. It lacks an explicit verb (it reads as a fragment starting with 'Whether'), which slightly blurs whether it fetches or checks, but the resource is unmistakable.

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 clause 'It comes before enable_mls_link' gives a useful ordering cue toward the one sibling an agent would confuse it with. However, there is no statement of when this tool is unnecessary, what happens if the link is not enabled, or which sibling to use for related listing data. Usage is implied rather than spelled out.

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