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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world behavior, so the safety profile is covered. The description does add one genuine behavioral trait — output is truncated ('capped in length') — but omits the cap size, what happens when the heading is absent, and how headings are matched. The '[no key]' fragment is unexplained and contributes nothing.

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?

The definition is short and front-loads the resource being returned, which is good. However, the '[no key]' fragment is dead weight that a reader cannot act on, so not every element earns its place.

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, so return values need not be explained, and annotations cover safety. What remains missing is essential: the relationship between the three input parameters and the truncation behavior of the returned section. For a 3-parameter tool with 0% schema coverage, this is under-specified.

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% across three parameters (path, slug, heading), so the description carries the full burden and largely fails it. It names 'heading' implicitly but never explains path vs slug, whether they are mutually exclusive or combinable, or how the heading string is matched. The '[no key]' notation is cryptic rather than clarifying.

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 states a specific resource ('one heading's section from a published article') plus a behavioral qualifier ('capped in length'), which distinguishes it from the whole-article siblings get_article and get_article_summary. The verb is only implied via the tool name, and the trailing '[no key]' fragment adds no clarity, but the core purpose is legible.

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 explicit when-to-use statement and no reference to alternatives, even though siblings get_article, get_article_summary, and search_articles overlap heavily with this tool. The agent must infer the selection criteria from the one-line purpose alone.

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