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

The annotations cover the safety profile (idempotentHint=true, destructiveHint=true), yet the description adds real context: the page is fetched once and an erroring page is refused, and 'Sends nothing' clarifies this is a silent config change rather than an outreach send. It also identifies the destructive action ('pass [] to clear them').

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 description is dense but front-loaded with the core action and every sentence contributes distinct information (page formats, fetch/refuse behavior, phrase limits, no-send behavior). Slightly packed, but no wasted sentences.

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?

With no output schema, the description still covers the parameter semantics, validation behavior, and the no-send outcome, which is sufficient for a 3-parameter config tool. Minor gaps remain around how the resulting state is confirmed.

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 coverage is 100% so the baseline is 3, but the description adds constraints the schema lacks: page accepts a path or same-site URL with empty string meaning homepage, phrases are capped at 3 phrases of 3 words, and the omit-vs-[] distinction for keeping or clearing. This meaningfully exceeds the schema text.

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 action and resource: choosing the page that outreach links to plus its anchor phrases. It clearly distinguishes itself from siblings like list_links and add_keywords by describing the configuration it sets, and an agent can tell what it does without opening the schema.

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 implied by the semantics (omit phrases to keep, [] to clear, empty string returns to homepage), but there is no explicit statement of when to prefer this tool over siblings such as set_profile or list_links, and no prerequisites or exclusions are given.

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