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

Annotations already declare this is not read-only, not destructive, and not open-world, so the safety profile is covered. The description adds the behavioral outcome that the domain becomes eligible for discovery again, which is useful, but says nothing about side effects, idempotency, or what happens if the domain was never blocked.

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?

A single short sentence with no wasted words and the key effect front-loaded. It is efficient, but the terseness is partly under-specification rather than disciplined concision.

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 mutation tool with three required, entirely undocumented identifiers and no output schema, the description omits the information an agent most needs: how to identify the domain/prospect, what scope projectId and siteId provide, and what the result looks like. Annotations cover only the safety hint.

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% for three required parameters (projectId, siteId, prospectId), so the description carries the full burden and fails: it mentions none of them. Worse, it describes the target as a 'domain' while the schema identifies targets by prospectId, leaving the agent to guess how a domain maps to these IDs.

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 gives a clear verb ('unblock'/'allow') and resource ('a previously blocked domain'), and states the observable effect: it will 'appear in discovery again'. It is distinguishable from siblings like reject_prospect or start_prospect_discovery, though it never names the symmetric block tool, and it refers to a 'domain' while no domain parameter exists.

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 guidance on when to call this versus related sibling tools (reject_prospect, add_prospect, start_prospect_discovery) and no prerequisites stated, such as the domain needing to have been previously blocked. The only implicit usage signal is the phrase 'previously blocked'.

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