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

Annotations already declare readOnlyHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds value beyond that with 'Sanitized' (data provenance) and the paid-access model at a stated price on Base, which is material behavioral context an agent cannot get from structured fields.

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 payload and followed by the cost. Every clause carries information; nothing is redundant with the schema or annotations.

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?

An output schema exists, so return values need no explanation, and with no inputs the description only needs to frame scope and cost, which it does. What is missing is any routing signal against the three sibling Polymarket tools, which matters given how crowded that namespace is.

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 takes zero parameters, so there is nothing to document and the baseline of 4 applies. The description correctly spends no space on input semantics.

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 resource (BTC/ETH/SOL Polymarket odds) and enumerates the exact data returned (probability spreads, liquidity depth in basis points). Clear and concrete, but it never distinguishes itself from the polymarket_alpha_divergence, polymarket_macro_fed, and polymarket_top_whales siblings that share the same Polymarket domain.

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 guidance whatsoever. The pricing sentence ('$0.002 USDC on Base') tells the agent what it costs, not when to reach for this over a sibling. An agent has to infer the selection criterion entirely from the domain.

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