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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered structurally. The description adds nothing beyond that - no prerequisites, no statement about whether re-registration overwrites or returns the existing record (which idempotency implies), no note on provider/consumer consent or authorization needs.

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 the brevity is under-specification rather than efficiency. The single fragment omits information that would earn its place, so length is not a virtue here.

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?

This is a mutating tool with an undocumented nested object parameter, no output schema, and zero parameter descriptions. The description supplies none of the missing context - not the shape of the SLA terms, not the identity semantics of provider versus consumer, not the return value.

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% across three required parameters, and the key one ("terms") is a free-form nested object whose shape is completely undefined. The description provides no compensating information about what provider_id, consumer_id, or the terms object should contain, so an agent cannot construct a valid call from the text.

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 "[agents] Register an SLA" essentially restates the tool name and title. It names a verb and resource, but there is no scope, no detail on what an SLA record contains, and no differentiation from siblings such as sla_report or escrow_create. The bracketed "[agents]" prefix is noise rather than clarification.

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, when-not-to-use, or alternative is stated. The presence of a sibling sla_report that clearly relates to the same resource makes the absence of routing guidance a real cost, though nothing is actively misleading.

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