Add identifier

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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the mutation status is covered. The description adds nothing about behavior: no indication of whether duplicate identifiers are rejected, what happens to an existing primary when is_primary=true, or permission/auth requirements. For a write tool it leaves the agent guessing.

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?

A single, front-loaded sentence with no filler; the verb and resource lead, and the examples are compact. Nothing to trim.

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?

With no output schema and only mutation-safety annotations, the description should carry behavior and usage context for a 5-parameter write tool, but it does not. It is adequate to identify the operation against a fully documented schema, but side effects, duplicate handling, and the primary-identifier interaction are unaddressed.

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 all five parameters are already documented in the schema, including the enum for type and examples for value. The description's parenthetical list of identifier types merely restates the enum, adding no new semantic detail. 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?

The description states a specific verb (Add) and resource (an identifier) and scopes it to an animal, then enumerates the five identifier categories. It is clearly distinct from add_premises_identifier, but it does not name any sibling or clarify against list_identifiers/find_animal_by_identifier, keeping it 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?

No guidance on when to use this versus remove_identifier, find_animal_by_identifier, or find_or_create_animal_by_eid. There are no stated prerequisites, no mention of farm scoping, and no exclusions.

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