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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered structurally. The description adds useful output-scoping context ('catalog summaries and pricing policy, not a checkout quote') but says nothing about result count, pagination, empty-result behavior, or how limit affects the response.

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?

Two short sentences with no filler; the purpose comes first and the output scoping second. Slightly awkward phrasing ('mod source preparations') costs a little, 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 three-parameter search tool with no output schema and zero schema descriptions, the definition clarifies what is returned and what is not, which is genuinely helpful. It still leaves the limit parameter and result-volume behavior undocumented, so it is only minimally complete.

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 0%, so the description must carry parameter meaning, and it only partially does: it hints that the primary input is search words and that category is optional. It says nothing about the limit parameter, its default of 16, or its maximum of 50, leaving one of three parameters entirely unexplained.

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 gives a specific verb ('Search') and resource ('listed public mod source preparations') plus an optional category filter, so an agent knows this is a catalog lookup. It also draws a scoping line against a checkout flow, which distinguishes it from prepare_cart_link, though it doesn't explicitly differentiate from get_mod_details.

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 closing clause implies this is for browsing catalog summaries and pricing policy rather than obtaining a checkout quote, which indirectly routes pricing-to-purchase intent to prepare_cart_link. However, there is no explicit statement of when to use this versus get_mod_details or get_compatibility_guidance.

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