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

With no annotations, the description carries the full behavioral burden. It usefully discloses the return format (Markdown full text), which is genuine context beyond the schema, but says nothing about permission needs, behavior on an invalid slug, or whether the content is static/cached. Modest but non-zero added value.

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?

A single front-loaded sentence with a bracketed scope label, verb, resource, and format. No waste and no padding, though the bracket prefix is mildly redundant with the verb phrase that follows.

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 simple one-parameter document fetcher with no output schema and a self-documenting enum, the description covers what it returns, in what format, and for which resource. Only the invalid-slug/error behavior is unaddressed, which is minor at this complexity.

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% and the description never mentions the slug parameter's form. However, the enum supplies the complete set of 22 valid values (preface, why-now, ch01–ch18, glossary, notes), so the semantic space is largely self-documenting despite the prose adding nothing.

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 (取得/get) plus resource (符文戰場新手指南某一章全文 – full text of one chapter of the Riftbound beginner's guide), which is clearly distinguishable from siblings like get_banlist, get_faq, and search_rules. It also states the output format (Markdown). It stops short of explicitly naming a sibling it is not, so it is clear but not fully differentiated.

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?

There is no when-to-use guidance, no exclusion criteria, and no reference to the alternative Riftbound tools (search_rules, lookup_term, get_faq) that could also answer an agent's question. Usage is only inferable from the single-purpose name.

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