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

Annotations declare destructiveHint=true, which the description neither reinforces nor contradicts. Beyond that the description adds nothing behavioral: no note that the change is irreversible, no mention of which fields can be modified, no permission or rate-limit context, and no indication that omitted fields are left untouched.

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?

Two short, front-loaded sentences with no filler; the purpose leads and the API reference follows. Slightly terse rather than padded, but nothing is wasted.

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 mutation tool with six parameters, one required, no output schema and a destructiveHint annotation, the description should at minimum clarify partial-update semantics and the destructive nature of the call. None of that is present, leaving the agent to infer behavior from the HTTP verb alone.

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 100%, so every one of the six parameters (including the required customer_id) is already documented in the schema. The description adds no parameter-level meaning beyond the endpoint path placeholder, so the baseline 3 applies.

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 ('Updates a customer's details') plus the underlying Chargebee endpoint, so the agent knows exactly what the tool does. It doesn't explicitly contrast itself with chargebee_create_customer or chargebee_get_customer, but the verb is unambiguous enough to distinguish it in practice.

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?

There is no guidance on when to use this tool versus siblings like chargebee_create_customer or chargebee_get_customer, nor any prerequisite (e.g. the customer must already exist). Usage is only implied by the word 'Updates'.

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