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

Transparent about side effects: states that selection does not rewrite the seller Pack. It does not mention auth or rate limits, but the annotations have no safety hints. The description adds meaningful behavioral context beyond the raw 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?

Two concise sentences with no redundancy. Every phrase adds value, and the most critical information (action, scope, special case, side effect) is front-loaded.

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 tool with three parameters and no output schema, the description covers the purpose, a special value, and a side-effect caveat. It does not explain the confirmation constant or productId, but these may be inferred from naming or context.

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 only 33% (one of three parameters described). The description explains the 'sequence' parameter via the 'sequence 0' instruction, but productId and confirmation remain undocumented. The description does not fully compensate for the low coverage.

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?

Clearly states the action: 'Set this account's default hosted intelligence checkpoint for an owned Pack.' The verb 'Set' and the target resource are explicit, and the scope ('for an owned Pack') distinguishes it from related tools like accept or propose.

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?

Provides a concrete usage instruction ('Use sequence 0 to return to the signed base Pack') and clarifies a key behavior ('selection never rewrites the seller Pack'). It does not explicitly compare with sibling tools, but the guidance is actionable.

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