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

Annotations already declare readOnlyHint=false and idempotentHint=true, but the description adds context the annotations lack: the 'email-verified application' precondition, 'at its exact version' (optimistic concurrency semantics), and 'durable' idempotency key. It still omits failure/rejection behavior, but it meaningfully exceeds the annotation coverage.

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?

A single front-loaded sentence that opens with the verb and packs constraints without filler. It is dense and borders on overloaded, but every clause carries distinct information.

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 described, and annotations cover the safety profile. The description supplies the key preconditions and constraints (verification, version, idempotency, slot bounds), making it largely complete for a mutation tool, though error/rejection behavior is unaddressed.

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?

With 0% schema description coverage the description must compensate, and it does map conceptually to all four required parameters: 'one to five' bounds slots, 'email-verified application' implies the session token, 'exact version' explains expectedVersion, and 'durable idempotency key' covers idempotencyKey. It does not explain the slot note field or date-time formats, so it is not exhaustive.

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 names a specific verb (Propose) and resource (viewing slots) plus a scope (one to five bounded future slots), so the agent knows exactly what the tool does. It does not explicitly contrast itself with the sibling tools viewings.get_status or viewings.respond_to_proposal, but the action is unambiguous on its own.

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?

Usage is implied by 'from an email-verified application', suggesting the tool is only valid for that context, but there is no explicit when-to-use or when-not-to-use guidance. No alternative sibling is named for comparison.

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