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

Annotations already provide readOnlyHint=true, idempotentHint=true, and destructiveHint=false, and the description is fully consistent with them. It adds value beyond the annotations by disclosing that the output is 'deterministic' and sourced from 'maintained playbooks,' and by explicitly stating that it does not verify live fixes — meaning the result reflects static guidance rather than current site state. No contradiction.

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 totaling roughly 30 words: the first states the core behavior and the second states scope exclusions. Nothing is redundant with the annotations or schema, and the most decision-relevant information is front-loaded.

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 single-parameter lookup tool, the description covers purpose, determinism, data source, and non-effects, and the presence of an output schema relieves it of explaining return structure. The clear gaps are the semantics of the 'tracker' parameter (0% schema coverage) and the absence of explicit guidance for choosing between this tool and its siblings. It is adequate but not 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 description coverage is 0%, so the 'tracker' property carries only type, regex pattern, and length bounds with no semantic description. The tool description contributes only the word 'tracker-specific,' implying the parameter identifies a tracker, but never states whether that should be a domain, vendor name, ID, or URL, and gives no examples. With coverage at 0%, the description was expected to compensate and largely does not.

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 verb ('Returns') and a specific resource ('deterministic, tracker-specific consent-gating guidance from RegSentry's maintained playbooks'). The negative scope statements ('does not change a website, contact a vendor, or verify that a fix was implemented') distinguish it from what an action-oriented remediation tool would do, so an agent can tell it apart from siblings like inspect_site_tracking and interpret_consent_evidence. This is a specific, non-tautological purpose statement.

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 second sentence gives explicit exclusionary guidance: this tool performs a pure lookup and will not modify a website, contact a vendor, or verify implementation, so an agent knows not to select it for execution or verification tasks. However, it does not explicitly name sibling tools as alternatives for those cases, so routing is bounded but not fully directive.

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