get_domain_intersection

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

There are no annotations, so the description must convey behavioral traits. It does disclose that the tool returns shared keyword opportunities with positions for both domains, which is useful context. However, it omits any mention of side effects, rate limits, or data freshness. For a read-only query tool this is acceptable but not comprehensive.

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 two sentences, with the core action front-loaded in the first sentence. The second sentence adds value by highlighting use case and output. There is no redundancy or fluff.

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?

While there is no output schema, the description partially explains the return value (shared keywords with positions). It does not mention default limits, pagination, or behavior when no intersections exist, but for a simple comparative tool with a well-documented schema, this is reasonably complete.

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 schema already fully documents all four parameters. The description does not add extra semantic detail about parameters beyond what the schema provides, such as examples or constraints. Baseline 3 is appropriate.

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 uses a specific verb ('Get') and resource ('keywords where both domains rank in the same SERP'), clearly distinguishing it from sibling tools like get_ranked_keywords (single domain) or get_serp_competitors (competitor discovery). It concisely conveys the core function and output.

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?

The description states 'Essential for competitive analysis' which provides clear context on when to use it. However, it does not explicitly name alternative tools or state when not to use it. This leaves the guidance at the level of implied usage rather than explicit exclusions.

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