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

Annotations already declare readOnly=false, destructive=false, idempotent=false; the description contributes the batching constraint, which is a genuine behavioral trait beyond the annotations. It does not address what happens on duplicate room names, whether creation is atomic across the batch, or permission requirements — notable gaps given idempotentHint=false.

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?

Purpose is front-loaded and the whole thing is four short sentences. The batching sentences repeat what the schema's maxItems and locations description already say, so there is some redundancy, but nothing is padded or vague.

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 an output schema, full annotation coverage and 100% schema descriptions, the description only needs to convey purpose, batch mechanics and downstream consumers — all of which it does. Missing only edge-case behavior (duplicates, partial failure), which is a modest gap for a create tool.

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 event_id, title, can_checkin, checkin_limit and checkin_message are already fully documented, including the strong "never invent titles" rule. The description adds no parameter-level meaning beyond what the schema states, 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 concrete verb and resource ("Create locations") scoped to "the provided event," and adds domain framing that locations feed sessions, exhibitors and check-ins. It is unambiguous against siblings like update_location or read_locations, though it never names an alternative explicitly.

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?

Provides real procedural guidance for the >10 case (create in batches, continue in chunks of 10). But that is invocation mechanics rather than when-to-use/when-not guidance, and it gives no signal about using create vs update_location or how to handle already-existing locations.

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