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

Annotations already declare destructiveHint=true, idempotentHint=false, and readOnlyHint=false, so the mutation profile is covered. The description adds useful context beyond the annotations: the api_key requirement, that operations are scoped to the caller's paper clones, the slot behavior, and the REST twin endpoint. However it never states what 'equip' does to a model already occupying a slot, which matters for a destructive, non-idempotent op.

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 tight sentences with the prerequisite and scoping constraint front-loaded, and the REST twin relegated to the end. Minor awkwardness in the parenthetical '(register_agent, no key needed)' but no wasted filler.

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?

Covers auth, scope, slot semantics, and a REST fallback, and annotations carry the safety profile with no output schema required. It still omits the core behavioral question for a destructive, non-idempotent equip: what happens to the existing model when a slot is reused.

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 the schema already documents api_key, model_id, instance_id, and slot_position. The description's slot and auth remarks merely restate what the schema states, adding no new syntax or format detail, so the baseline 3 is correct.

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 (Equip) and resource (a trading model on one of YOUR PAPER clones), which an agent can distinguish from the sibling equip_bot_skill by resource type. It does not explicitly call out the skill-vs-model distinction, but the resource is concrete enough to route correctly.

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?

Imparts the key constraint that this applies only to the caller's own paper clones and notes the slot range and auto-assignment. It gives prerequisite guidance (api_key from register_agent) but offers no explicit when-not or comparison to the nearby equip_bot_skill alternative, leaving usage context implied.

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