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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, and openWorldHint=false, so the safety profile is covered. However, the description adds no behavioral context such as what the certificate contains, whether it requires a prior decision record, or what happens when decision_id is unknown. It merely repeats the tool's domain.

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 short but under-specified rather than concise; it front-loads a jargon-heavy spec identifier (XPL-100-ExplainBound) that offers no actionable information. There is no wasted sentence, but there is also no useful sentence.

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 three required parameters including a nested object, no output schema, and no annotation explanation of the certificate lifecycle, the description is far too thin. It does not tell an agent what inputs are needed or what the tool returns, leaving the definition materially incomplete for a non-trivial compliance tool.

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%, and all three required parameters (model_id, decision_id, and the nested subject_context object) are undocumented. The description supplies no meaning, format, or constraints for any of them, so an agent must guess at what subject_context should contain.

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 is a noun phrase, 'Explainability certificate (XPL-100-ExplainBound)', with no action verb and no statement of what the tool actually does. It identifies a resource type but does not distinguish it from siblings such as compliance_check, compliance_transparency, or compliance_fairness, all of which could plausibly produce compliance-related artifacts.

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 guidance on when to use this tool, when not to use it, or which of the many compliance_* siblings to choose instead. The description offers nothing beyond a label.

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