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

Annotations already declare read-only, idempotent, closed-world and non-destructive, so the safety profile is covered. The description still adds real context beyond them: output is Persian (fa-IR, RTL) text scraped from public fekrestan.com pages, aimed at parents and teachers. The one added restriction (no answers to in-app exercises) pre-empts a likely wrong expectation.

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 sentences, front-loaded with what the resource is and who it serves, then the return format and the boundary. Some clauses are dense with parentheticals, but each one adds distinct information (audience, language, scope, exclusion) rather than padding.

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 zero-parameter, read-only tool with no output schema, the description carries the necessary load: it explains the content, the language and direction of the returned text, the intended audience, and one important limit on what the content covers. Only the sibling routing is left implicit.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline for a no-param tool applies. Nothing in the description misleads about inputs, and it correctly implies the tool is callable with no arguments.

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 concretely enumerates what the tool returns: the site's purpose, target audience (grades 3–9 and parents), lesson mechanics, privacy facts, learning tracks and links to public pages. That is far more specific than a restatement of the name, and the closing exclusion ('No answers to in-app exercises') draws a clear line. It stops short of naming which sibling it replaces (e.g. get_how_we_work, get_roadmap, how_to_start), which keeps it from a 5.

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?

Usage is implied rather than stated: an orientation/entry-point tool aimed at parents and teachers, sourced from public pages. The negative constraint ('No answers to in-app exercises') usefully signals one thing it is not for. However, with siblings like get_how_we_work, get_roadmap, get_access_summary and how_to_start, the agent gets no explicit rule for choosing between this overview and those narrower pages.

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