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

With no annotations present, the description carries the full burden and does so thoroughly. It discloses the no-additional-credit-cost behavior, the Maintain subscription prerequisite, the x402 exception, the delivery-mode tradeoff, and the token cost of 'inline' delivery.

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 dense but every sentence earns its place: purpose, prerequisite, account-type exception, site_profile handling, and delivery options are all covered without fluff. The core purpose is front-loaded in the first sentence.

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?

Given three parameters, no output schema, and no annotations, this description is remarkably complete. It explains preconditions, authentication resolution, subscription gating, delivery results, and cross-reference to purchase_scaffold, leaving little ambiguity for an agent deciding whether and how to call the tool.

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 coverage is 100%, so the baseline is 3, but the description adds value beyond the schema: it explains the default delivery behavior, ties site_profile to purchase_scaffold semantics, and clarifies that inline delivery exists for callers that cannot run git. These additions go beyond simple restatement.

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 a specific verb and resource: 'Re-fetches a scaffold you already purchased via purchase_scaffold,' immediately distinguishing it from purchase_scaffold and verify_scaffold. It also states exact outputs: a fresh clone credential and current component versions.

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 gives clear context: this tool is for already-purchased scaffolds, requires an active Maintain subscription on credit-flow projects, and has no Maintain gate for x402 projects. It references set_projects and purchase_scaffold, but does not explicitly state when-not-to-use it versus sibling alternatives such as verify_scaffold.

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