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

The annotations already indicate destructiveHint=true and readOnlyHint=false, so the agent knows this is a mutating operation. The description adds valuable context beyond that: 'Nothing is charged for a released spot' and that the commitment id comes from 'hold or status.' These details clarify side effects and required input provenance, which annotations do not cover. It does not describe other consequences like reversibility, but the annotation coverage lowers the burden.

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 three sentences with no filler. The alias note is front-loaded, the action is stated clearly, and the parameter requirements and side-effect note are given efficiently. Every sentence adds needed information without redundancy.

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 three-parameter, no-output-schema tool with destructive annotations, the description covers the key facts: what it does, the required parameters and their sources, the destructive nature (via annotations), and the no-charge side effect. It does not explicitly mention that this is deprecated or that 'release' is the preferred name, but the title and first sentence imply it. This is nearly complete for an alias 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 only 33% (only 'chain' has a description). The description compensates by explaining all three parameters: 'product slug' maps to chain, 'email that holds it' maps to email, and 'commitment id from hold or status' maps to commitment_id. This adds meaning beyond the schema, though it does not specify formats or optional details. Given the low coverage, this is a solid compensation.

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 clearly states the tool's action: 'Release a held spot.' It also explicitly identifies the sibling 'release' by saying 'The old name for release,' which distinguishes this tool as an alias. An agent can immediately understand the resource and action, and how it relates to the similar sibling.

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 description gives preconditions: 'Needs the product slug, the email that holds it, and the commitment id from hold or status.' This implies when to use it (when you have a held spot to release). However, it does not explicitly say when to prefer this tool over 'release' or state that it is deprecated, nor does it mention alternatives like 'hold' or 'park'. The guidance is implied rather than explicit, so it is adequate but not strong.

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