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

Annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is covered externally. The description's one real addition is 'Requires a master API key' — a genuine auth prerequisite not in the annotations. It says nothing about reversibility or what activation does to in-flight contacts.

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 functional content is two tight sentences with the auth caveat front-loaded alongside the action. The pricing boilerplate is non-behavioral but is clearly delimited as a comment block.

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?

An output schema exists, so return values need not be explained, and annotations carry the destructive/idempotency profile. What is missing is guidance on irreversible activation, which matters for a destructive, non-idempotent mutation.

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% with a single parameter, so the baseline is 3. The description adds no format or sourcing detail for sequence_id beyond the schema's 'Sequence ID.'

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+resource ('Activate a sequence'), which is much clearer than the name's opaque 'approve' segment. However, it does not differentiate from close siblings like _abort and _archive, so an agent must infer the distinction.

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?

Gives no when-to-use guidance and names no alternatives, despite siblings _abort and _archive being obvious confusable options for an emailer campaign sequence. The agent gets no routing help.

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