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

The annotations already declare readOnlyHint=true and openWorldHint=false, and the description does not contradict them. It adds useful behavioral context: the board is free, requires no key/email/signup, covers all ~330 players, and is filterable. It does not describe the response format, but annotations already cover the safety profile.

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 description is longer than minimal but information-dense; each sentence contributes something: board contents, access requirements, pro-only features, and sample queries. It is front-loaded with the core definition, though the pro-upsell sentence could be trimmed without losing essential invocation guidance.

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 zero parameters, read-only annotations, and no output schema, the description covers what an agent needs: board contents, filtering options, access constraints, and example user intents. It does not specify the exact output structure, but the listed fields largely substitute for that in this simple case.

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?

The tool has zero parameters and the schema reflects that, so there is no parameter ambiguity (baseline 4). The description still adds conceptual filtering context (position, PPR format) that is useful even though no formal parameters exist.

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 clearly identifies a concrete resource (the fantasy football draft board) and spells out its contents: rankings, projected points, ADP, draft round, and sleeper/bust flags, plus position filtering. It does not use an explicit action verb like 'get' or 'show,' and it does not directly name sibling tools, so it narrowly misses 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?

The 'Use for' section provides concrete query examples and contexts (rankings, top RBs, draft board, best available by position), giving an agent strong cues for when to invoke it. It does not explicitly contrast it with nearby siblings like best_available or sleepers_and_busts, which prevents a 5.

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