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

Annotations already declare readOnlyHint, idempotentHint and closed-world behavior, so the safety profile is covered. The description usefully adds the return shape (title, url, slug) and the intended call ordering, which annotations cannot convey; it stops short of saying how many guides exist or their slugs.

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 with zero filler: the first front-loads what is returned, the second front-loads the calling instruction. Every clause carries either content or routing information.

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?

There is no output schema, so the description must convey the return shape, and it does so via (title, url, slug) plus the three guide topics. A slight gap remains in not indicating whether slugs are what get_guide consumes, but the essential picture is complete for a parameterless list tool.

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 the baseline is 4. The description correctly implies no input is required and instead spends its words on what the response contains, which is the only semantic information relevant here.

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 names a specific verb (list) and resource (Swedish crypto tax guides), enumerates the actual guide topics (K4 avsnitt D, genomsnittsmetoden, tools comparison) and even the returned fields (title, url, slug). It is clearly distinguishable from get_guide, which retrieves a single guide.

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?

"Call this first for any question about declaring crypto in Sweden, then get_guide" gives an explicit entry-point rule and names the follow-up sibling. The condition that selects this tool over get_guide/search_crypto_tax_tools is stated outright.

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