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

Annotations already cover readOnly/idempotent/non-destructive, and the description adds real value beyond them: CTAs are stripped from the body and hoisted into callToActions, with relatedSlugs and faq split out. It does not discuss error behavior for unknown slugs or whether private/draft content is excluded, so not a 5.

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 that leads with the return value and then enumerates the auxiliary fields; every clause carries information. It is dense but not padded, though it could be split for readability.

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, yet the description still helpfully explains the shape of the non-body sections (callToActions, relatedSlugs, faq). Combined with the read-only annotations and the fully documented single parameter, an agent has nearly everything needed; only failure/edge-case behavior is absent.

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?

There is a single parameter with 100% schema description coverage, and the schema already explains that slug must come from search_content. The description adds no additional slug syntax or format detail, so the baseline of 3 applies.

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: returns the full Markdown content plus canonical URL of a public Elfy.Life article. It is clearly distinguishable from get_recipe and search_content by naming the resource type and the related-slug routing.

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 only implied: the description says relatedSlugs should be read with get_article or get_recipe, which hints at traversal, and the schema notes slug comes from search_content. There is no explicit 'use this when… / not when…' statement or exclusion, so an agent must infer when to pick this over siblings.

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