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

Annotations cover safety (readOnlyHint=false, openWorldHint=true, idempotentHint=false, destructiveHint=false), and the description adds substantial context beyond them: a sign-in link is returned, the vendor token is used for exactly one call and never stored or returned, the link expires after a few minutes, and loaded tools are checked and submitted as a review update on published listings. This is exactly the extra behavioral detail 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?

Four sentences, front-loaded with purpose and permission before mechanics, with no filler. It is dense with distinct facts (auth link, token handling, review submission, expiry) but each sentence carries needed information; only borderline against a strict conciseness bar.

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?

An output schema exists, so return values need no prose explanation. The description supplies the auth requirements, permission model, token lifecycle, expiry, and the downstream review submission — everything an agent needs to invoke this correctly and set expectations for the caller.

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 both slug and agent_id, including their mutual-exclusivity rule and the 'must name the same listing' constraint, are already documented in the schema. The description adds no parameter-level detail, which is the correct baseline when the schema does the heavy lifting.

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 ('Load the tool list of an MCP server listing') and narrows the scope with a clear condition ('whose server needs a sign-in before it will list its tools'). This distinguishes it from adjacent siblings such as reintrospect_mcp, repull, and preflight without requiring the schema to be opened.

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?

Gives an explicit precondition (the server requires sign-in before listing tools) and an authorization rule ('Only the listing's owner or an admin may do this'), plus the follow-up steps to complete the flow. It does not explicitly name sibling alternatives for the non-sign-in case, so it stops short of a full when/when-not routing statement.

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