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

The description adds meaningful behavioral details beyond annotations: a $0.01 stablecoin machine payment, deterministic reason codes, policy/action digests, and a tamper-evident receipt. It also discloses a limitation ('not ... a safety guarantee'). Since annotations already cover readOnly/idempotent/destructive, this additional context is complementary rather than repetitive.

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 three sentences, with the core purpose front-loaded, followed by payment/output details and a clarifying caveat. Every sentence earns its place with no filler. It is dense but not bloated.

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 complex tool with no output schema and highly nested parameters, the description is incomplete. It does disclose the return categories (within_scope, outside_scope, review_required) and receipt, which is good. But it does not explain when review_required would be returned, what the reason codes mean, or how to correctly populate the action/authority structures, leaving an agent to guess at decision semantics.

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%, and the description only maps 'proposed action' and 'supplied authority' to the two required parameters at a conceptual level. It provides no guidance on fields like allowedActions, deniedActions, maxSpend, approvalRequiredFor, or how action.type/resource interplay with authority. An agent must rely entirely on field names and types, which is insufficient for such nested objects.

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 opener 'Determine whether one proposed action is within explicitly supplied authority' is a specific verb+resource statement. The closing clause clarifies what the tool is not (identity verification, legal authorization, safety guarantee), which distinguishes it from related concepts. It does not explicitly name sibling tools like preflight or verify_receipt, so it misses a full 5.

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?

It clearly establishes when to use this tool: whenever a proposed action needs to be checked against explicitly supplied authority. The negative clauses tell the agent not to use it for identity verification, legal authorization, or safety guarantees. However, it never references the sibling tools or gives a when-not condition that points to an alternative.

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