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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so the safety profile is covered. The description adds the meaningful scope constraint that this is limited to the next UFC card (not historical bouts), but omits pagination, freshness or how the simulated outcome table is produced. This is moderate added context over the structured hints.

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?

The purpose is front-loaded in the opening clause before the field inventory. The single long sentence is dense, but with no output schema the field enumeration substitutes for one and largely earns its length; it could still be split for readability.

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, the description correctly compensates by spelling out the returned payload in detail, and parameters plus safety annotations are handled in structured fields. The one real gap is the absence of usage/routing guidance against the crowded mma_* sibling set.

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% for both parameters (limit with its plan-limit caveat, and fuzzy fighter name matching), so the schema does the heavy lifting. The description adds no parameter guidance of its own, making the baseline 3 appropriate.

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 names the resource precisely — a side-by-side bout profile for the next UFC card — and enumerates the exact data fields returned, so an agent knows this is a stat-heavy per-bout lookup. It stops short of distinguishing itself explicitly from overlapping siblings like invoke_mma_elo, invoke_mma_fight_sim or invoke_mma_projections, which the field list partially (but not explicitly) overlaps.

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?

There is no when-to-use or when-not-to-use guidance and no alternative is named. The description implies usage by describing the payload, but with nine sibling mma_* tools an agent gets no routing help for choosing this over invoke_mma_elo or invoke_mma_fight_sim.

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