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

Annotations already declare readOnly, idempotent, non-destructive and open-world, so the safety bar is low. The description adds real context beyond them: cards are weekly, are predictions rather than confirmed events, and each carries a rationale, a dated suggested move, and dated evidence, so the agent knows to treat output as probabilistic advice.

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?

Two sentences, front-loaded with the resource and cadence, then the card contents. No filler, and the enumeration of card fields earns its space by describing the return shape.

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 carries the return-value burden and does so well by listing the card anatomy (why, suggested move with date, receipts/article links). Minor gaps remain: freshness/latency of the weekly refresh and whether predictions are scoped to any date window are unstated.

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?

Zero parameters, so the baseline is 4. The description does usefully clarify that scope is fixed to every tracked rival with no filtering, which is the only semantic question a parameterless call raises.

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: weekly prediction cards per tracked rival, explicitly forward-looking ('what is coming up', 'suggested move with its date'). An agent can distinguish it in spirit from the backward-looking get_competitor_moves_feed, but the description never names that sibling, so the differentiation is implicit rather than stated.

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?

The reference to 'the Predictions page' and the split between what just happened versus what is coming implies when to reach for it, but there is no explicit when/when-not and no named alternative. An agent must infer that get_competitor_moves_feed covers raw recent moves while this covers predictions.

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