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

With no annotations, the description must carry the burden of behavioral disclosure. It adds useful context by flagging LOW_WRITE and identifying the exact v2 endpoint and request body shape, but it does not explain side effects, duplicate handling, or what the `confirm` flag changes. The mutation intent is clear, yet operational behavior remains incomplete.

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 compact and front-loaded: the plain-language action, a risk/type marker, and the exact endpoint/body note each earn their place. There is no filler or redundant restatement of the schema.

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 two-parameter tool with no output schema, the description covers the main payload and endpoint, but the undocumented `confirm` parameter leaves a real invocation gap and there is no mention of return/response behavior. It is usable for a simple bulk-add operation, but not fully complete.

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%, so the description was expected to explain both parameters. It clarifies that entries are plain strings and maps them to the `bl_values` array, but it completely omits `confirm`, an optional boolean whose semantics and default behavior are opaque. The core parameter is only partially covered and the second parameter is undocumented.

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 first sentence uses a specific verb and resource ('Add emails/domains to the blocklist') and scopes values to plain strings, so the tool's job is immediately recognizable. It is readily distinguishable from sibling tools such as remove_from_blocklist and list_blocklist.

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 explicit when-to-use/when-not-to-use statement or mention of the alternative removal tool; intended usage is only inferred from the verb 'Add' and resource 'blocklist'. This rises above no guidance but stops short of explicit routing guidance.

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