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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds non-obvious behavioral context beyond that: passwords and payment-card references are stripped from the returned owner, which tells the agent the payload is sanitized. It does not cover not-found behavior or whether lookups are exact-match only.

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 clauses, front-loaded with the action and the alternative identifiers before the endpoint and redaction note. Every sentence carries information; there is no filler or repetition of the 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 read-only single-record lookup with 100% schema coverage and no output schema to explain, the description covers the lookup modes, the selection rule, and a notable data-sanitization trait. Nothing an agent needs in order to call it correctly is missing.

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%, so the baseline is 3, but the description adds the critical 'exactly one of' cardinality constraint that the schema does not express (zero required parameters, no oneOf/anyOf). That is meaningful semantics beyond the field docs, though it adds no format or matching detail for each identifier.

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 ('Get one owner (customer) record') and immediately scopes it to a single-record fetch, which cleanly separates it from the plural sibling gingr_list_owners. It even names the upstream endpoint (GET /api/v1/owner), removing any ambiguity about what is being retrieved.

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?

Gives an explicit invocation rule: exactly one of owner id, pet id, reservation id, phone, or email. That is real when-to-use guidance absent from the schema. It stops short of a 5 because it never contrasts itself with sibling lookups such as gingr_list_owners or gingr_list_new_modified_owners for the bulk/updated cases.

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