Set keyword target URL

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

The description mentions the ability to 'clear' the target URL (implying null support), which adds some value. However, with no annotations describing behavior (readOnlyHint=false, destructiveHint=false are defaults), the description carries the burden of explaining mutation effects, idempotency, permissions, or whether clearing affects future rank checks. None of this is disclosed. It doesn't contradict annotations, but it's thin on behavioral context.

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 a single efficient sentence with zero waste. The 'Set or clear' wording packs semantic content compactly. It could arguably be slightly more informative while staying concise, but it earns a solid score for front-loaded, economical writing.

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 focused single-purpose mutation tool with a clear schema and no output schema, the description is nearly adequate. However, it doesn't explain what 'evaluating a keyword ranking' means, whether this is a permanent overwrite, whether it triggers re-checks, or the expected behavior when clearing with subsequent rank checks. For a tool with no output schema and no annotations, slightly more context would be valuable.

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 75%: the schema documents keyword_id, project_id, and target_url but NOT idempotency_key. The description doesn't add parameter details beyond the schema, but with 75% coverage the baseline is near the high bar. The concept of 'clearing' (null target_url) maps to the 'Set or clear' phrasing, adding slight meaning beyond schema. A minor gap remains for idempotency_key semantics.

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 clear verb+resource+scope: 'Set or clear the target URL used when evaluating a keyword ranking.' This clearly distinguishes it from sibling tools like update_keyword and add_keywords by specifying its focused purpose on the ranking target URL. It clearly conveys what action is taken and on what resource, though it doesn't explicitly name a differentiating sibling.

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 provides no guidance on when to use this tool versus alternatives like update_keyword or bulk_update_keywords. It implies usage context via the phrase 'when evaluating a keyword ranking' but offers no explicit when/when-not guidance or mention of alternative tools.

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