Smartlead: get domain block list

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

Annotations already provide readOnlyHint and destructiveHint, but the description adds concrete safety specifics: 'read-only: yes', 'may consume SmartProspect credits: no', 'creates or modifies remote state: no', 'can send email: no', and 'destructive: no'. It also states the endpoint, providing useful context beyond the annotations.

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 front-loaded with the purpose and then provides a structured safety block. The final 'Free and read-only' is slightly redundant with the safety line, but the overall length is acceptable and every other sentence adds value.

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 simple list operation, this description is complete: it states the purpose, safety profile, endpoint, and is backed by a full input schema and output schema. The agent has all necessary context to invoke the tool safely and correctly.

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%, so the parameters are already fully documented in the input schema. The description's mention of 'source and client association' hints at filter_client_id but does not add parameter-level meaning beyond what the schema provides.

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 'List blocked domains and email addresses' which uses a specific verb and resource, and adds 'with their source and client association' to clarify the returned data. It clearly distinguishes this get/list tool from sibling add/remove block-list tools.

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 implies this is the read-only viewing tool for the domain block list, especially given sibling tools 'smartlead_add_domain_to_block_list' and 'smartlead_remove_domain_from_block_list'. However, it lacks explicit when-to-use or exclusionary language, so it stops short of a 5.

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