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

Annotations already declare destructiveHint=true and idempotentHint=true, so safety is covered. The description earns credit for adding the non-obvious consequence that the pool's numbers survive the deletion — the single most important fact an agent needs before calling this. It stops short of stating whether the delete is recoverable or what the response contains.

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 sentences, zero waste, with the outcome-defining fact about retained numbers placed immediately after the action. Nothing is padded or repeated from the name.

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 one-parameter destructive tool with full annotation coverage and no output schema, the description covers what the tool does and the key side effect. Missing only whether the deletion is reversible and what happens to numbers' pool associations, which would round it out.

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 100% for the single `id` parameter ("Pool id"), so the structured field carries the load. The description adds nothing about the id's format or how to obtain it (e.g., from list_number_pools), which is the baseline-3 case.

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?

States a specific verb ("Delete") and resource ("sender pool"), which is unambiguous against siblings like get_number_pool, update_number_pool, or clone_number_pool. It uses "sender pool" where the tool name and schema say "number pool," a minor terminology drift, but the intent is still clear.

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?

There is no when-to-use guidance: nothing says to prefer update_number_pool for edits, to reassign numbers first, or what prerequisite state a pool must be in. The agent must infer the context entirely from the name.

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