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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description earns credit for the extra context it supplies: the server picks the initial stack by provider availability, and the response distinguishes desired from applied state with ok | pending | error statuses plus the steps of the last switch and lastError. That is genuine behavioral disclosure beyond the annotations, though it doesn't cover what an unconfigured or erroring stack implies for the agent.

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?

Front-loaded with the core fact (which stack answers the AI tier) and then the return detail. The parenthetical about the ElevenLabs Agents platform and call transfer is longer than strictly needed for a getter, but it does resolve a real ambiguity about what 'elevenlabs' means in this product.

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 single-parameter, read-only getter with no output schema, the description covers the important return fields (desired vs applied, status, last switch steps, lastError) and the semantics of the stack choice. Minor gap: it doesn't say what is returned when no stack has been applied yet, or how 'pending' resolves.

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% and the single businessId parameter already documents its pattern and default (business of the API key). The description adds nothing about businessId or cross-business reads, so the schema is doing all the work here — baseline 3.

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?

States a specific verb and resource ('Read which voice stack answers the AI tier') and enumerates the two possible values (livekit, elevenlabs), making it trivially distinguishable from the write-side sibling ringkit_put_voice_stack. The parenthetical explains what the ElevenLabs variant actually is, removing ambiguity about the two options.

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 the verb 'Read' and by the presence of ringkit_put_voice_stack, but the description never says when to call this versus that sibling or when the stack state is worth checking. It also doesn't state any prerequisite (e.g., that the business must be provisioned). The reader can infer intent but must do the routing work themselves.

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