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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's added value is the disclosure that this is a static document identical to https://seonix.ai/SKILL.md — telling the agent the content is fixed, externally referenceable, and cacheable, and that `section` narrows rather than transforms the response. It does not say what happens when the substring matches no heading.

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, no filler; the core identification comes first, the narrowing instruction last. The parenthetical content list is dense but every item is informative rather than decorative.

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 1-optional-param read-only document fetch with no output schema, the description is close to sufficient: it conveys origin, scope, and the section-filtering mode. Remaining minor gaps are the return format and unmatched-section behavior, which an agent could still get wrong on a first call.

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?

With a single optional parameter at 100% schema description coverage, the schema already explains that `section` is a step-heading substring. The description restates this behaviorally (returns one step) but adds no format, matching, or fallback semantics beyond the schema — the baseline 3 case.

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 resource — the Seonix integration skill/guide for connecting a custom site or blog as a publishing channel — and enumerates its contents (endpoints, payload, read routes, media, self-test, hand-over), which tells an agent exactly what kind of document it gets back. It does not name a sibling it is distinct from (e.g. get_playbook or list_channels), so the boundary with the rest of the catalog is left implicit.

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?

'Pass section to get one step' implies the intended two modes (full guide vs. one step) but never says when to prefer this over list_channels or get_playbook, nor that it is the prerequisite for building a custom publishing channel. Usage is inferable from the content listing rather than stated.

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