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

No annotations are provided, so the description carries the full burden, and it discloses nothing: not whether this reads or writes, whether the certificate is generated or merely fetched, whether it is expensive, what permissions are needed, or what is returned (no output schema either). 'Certify/explain' tools are typically heavy operations, and none of that is conveyed.

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?

It is short, but brevity here is under-specification rather than conciseness — the single fragment conveys no actionable content, and the '[security]' tag and internal codename consume the space that should hold the purpose.

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 3-required-parameter tool with a nested object, no annotations, and no output schema, the definition provides nothing an agent needs to invoke it correctly. The gap is total rather than marginal.

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?

Three required parameters with 0% schema description coverage, including a nested 'subject_context' object, and the description explains none of them. It adds zero meaning beyond the raw parameter names, leaving the agent guessing at formats for model_id, decision_id, and the nested context.

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 plus an internal codename ('Explainability certificate (XPL-100-ExplainBound)') that largely restates the tool name compliance_explain. There is no verb and no statement of what the tool actually produces or does, so an agent cannot distinguish it from siblings like compliance_transparency or compliance_check.

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?

No when-to-use guidance, no prerequisites, and no mention of any alternative tool. The agent is given nothing to decide between this and the many other compliance_* siblings.

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