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

With no annotations, the description carries the full burden. It helpfully discloses side effects ('old texting and calling settings are put back', 'stops sending or answering') and an auth constraint ('Owner only'). It does not state whether the disconnect is reversible, what happens to message/call history, or whether billing stops, which are significant gaps for a mutation tool.

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?

Three short sentences, front-loaded with the action and followed by consequences and the permission constraint. No filler or repetition.

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 explained. For a single-parameter mutation with no annotations, the description covers effects and access level adequately. The main missing piece is reversibility and the fate of existing message/call data.

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 single parameter shop_id is never mentioned in the description. 'the shop's Twilio account' only loosely implies that shop_id identifies the shop, without adding format or scope detail beyond what the schema provides.

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: 'Disconnect the shop's Twilio account.' It also describes the resulting state (old texting/calling settings restored, Doing Work stops sending/answering), which distinguishes it from connect-style siblings. It does not name an alternative tool explicitly, so it falls short of a 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?

The 'Owner only' clause gives a permission precondition, which is useful. However, there is no explicit when-to-use guidance versus related siblings like phone_connectTwilio, phone_stop, or phone_useNumber, and no statement about irreversibility or when this should be avoided. Usage is only implied by the tool name.

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