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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds only an implementation note ('SOAP GetCustomerByID') and says nothing about behavior an agent would care about, e.g. whether an unknown ID raises an error or returns empty.

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 clauses, front-loaded with the identifying scope. The trailing 'SOAP GetCustomerByID' is largely redundant with the name and title, but it costs little.

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 one-parameter read-only lookup with full schema coverage and declared annotations, the essential information is present. The notable residual gap is the absence of an output schema, so the description could have hinted at what customer fields are returned; otherwise it is fit for purpose.

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 a single parameter and 100% schema description coverage, the schema already documents 'The numeric CustomerID.' The description adds a marginal provenance hint ('as returned in other replies') but no format or range detail beyond the schema's minimum/maximum.

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 ('get') and resource ('customer') and pins the identifier as the numeric CustomerID, which distinguishes it from kashflow_find_customer_by_email. It does not, however, distinguish itself from the sibling kashflow_get_customer, which an agent must still disambiguate 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?

The parenthetical 'as returned in other replies' implies a usage pattern (obtain the ID from a prior list/create call) but does not state when to prefer this over kashflow_get_customer or kashflow_find_customer_by_email. Usage is implied rather than guided.

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