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

Annotations cover the safety profile (readOnly=false, destructive=false, idempotent=true), and the description adds a genuinely non-obvious side effect: selecting an interpreter 'may create a payment next action.' That is real behavioral disclosure beyond the structured fields. It still omits auth/permission requirements and whether a selection can be undone, so it is not a 5.

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 sentence with zero filler, front-loading the action and appending the side-effect caveat where it matters most. Nothing is repeated from the title or schema.

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 mutating tool with no output schema, 0% parameter documentation, and three required arguments, the description leaves the agent without guidance on argument semantics, permissions, or the result of a successful selection. The side-effect note helps, but the definition is not complete enough to call confidently.

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% for all three required parameters. The description only loosely implies that 'request' maps to booking_id and 'interpreter' to interpreter_id; it says nothing about idempotency_key's role or required format, so it fails to compensate for the coverage gap.

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 states a specific verb+resource ('Select an available interpreter') scoped to an owned request, which is clearly distinct from sibling operations like cancel_booking, create_booking, or get_responses. It does not explicitly name a sibling for routing, but the action is unambiguous.

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?

'for an owned request' and 'available interpreter' imply preconditions (you must own the booking and the interpreter must be available), which is implied usage guidance. There is no explicit when-to-use versus alternatives, no mention of the typical workflow position (e.g. after get_responses), and no exclusions.

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