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

With no annotations, the description carries the full behavioral burden. It does disclose a real prerequisite (an active SAAX Premium subscription), but that same constraint is already duplicated in the schema. It says nothing about result volume, ordering, pagination, or failure modes when the subscription is inactive, which matters for a list endpoint.

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?

Three short sentences, all front-loaded: purpose first, then the premium prerequisite, then the alternative routing. Every sentence earns its place with no filler.

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 list tool with no output schema, the description covers what it returns, the auth prerequisite, and the sibling routing. It could note ordering or pagination behavior for a list endpoint, but no essential calling information is missing.

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 100% for the single subscriptionEmail parameter, so the schema already documents it fully, including the Premium requirement. The description adds no syntax, format, or validation detail beyond the schema, so the baseline 3 applies.

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 opens with a specific verb and resource ('Returns all commitments associated with a subscription email') and scopes it to a subscriber. It explicitly distinguishes itself from get_commitment and get_commitment_status, so an agent can select it without opening sibling schemas.

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?

It states the calling condition ('Call this to retrieve commitment history for a subscriber') and names two alternatives with the exact situations that select them: get_commitment for a single ID, get_commitment_status for status-only checks. Nothing is left to inference.

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