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

Annotations already declare destructiveHint=true and idempotentHint=false, and the description reinforces this usefully with 'Releasing cannot be undone.' However, for a bulk mutation it omits genuinely valuable context not covered by annotations: whether a batch is atomic or partially applied, whether the confirm parameter is mandatory for release, and what happens on failure mid-batch.

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?

Two short sentences, front-loaded with the capability and closing with the irreversible-operation warning. Efficient, with the only cost being the inaccurate operation enumeration rather than verbosity.

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 destructive, non-idempotent bulk mutation with six parameters, no output schema, and only partial schema descriptions. The description adds nothing about partial-failure behavior, the required confirm value for release, or what the caller gets back, leaving key gaps for an agent to guess at.

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?

With 67% schema coverage, the description should sharpen the remaining gaps, but its operation list conflicts with the enum ('assign to a customer' is not an action) and skips add_to_pool/remove_from_pool/set_label, which are exactly the parameters the schema documents thinly. The 1000-id cap and the confirm semantics are left entirely to the schema.

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 names the resource (numbers) and the batch scope, and lists example operations: tag, untag, assign to a customer, release. However, 'assign to a customer' does not exist in the schema's action enum (which offers add_to_pool, remove_from_pool, add_tags, remove_tags, set_label, release) and pool/label operations are never mentioned. The stated purpose is recognizable but the operation list is misaligned with what the tool actually does, so an agent could mis-select it.

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?

'Act on many numbers at once' implicitly contrasts with the single-resource siblings (assign_number_to_customer, release_number), but no alternative is named and no when-not condition is given. The only explicit guidance is the warning that releasing is irreversible.

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