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

With no annotations provided, the description carries the behavioral disclosure burden. It does disclose an important operational trait: the exact $0.003 USDC fee and the x402/Solana mainnet payment path. It does not mention data freshness, return format, or whether wallet authorization is required, so coverage is partial.

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 two concise sentences: the first front-loads the returned data, and the second gives the pricing. There is no filler, repetition, or unnecessary detail.

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?

For a no-parameter read-only snapshot, the description covers what data the agent will receive and what the call costs. It does not specify exact output fields or freshness, but the low complexity and empty schema make those minor gaps.

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, so there is no ambiguity for the agent to resolve. No parameter documentation is necessary, and the baseline of 4 is 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 states exactly what the tool returns—SOL and BTC prices, funding rates, and Fear & Greed—under the clear verb 'get market snapshot.' The phrase 'in one call' also distinguishes it from the many single-metric sibling tools such as get_btc_price and get_fear_greed.

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 aggregation wording implies this tool is for a combined market overview, and the fee hints at a cost tradeoff. However, it never explicitly says when to prefer this over calling individual siblings or when to avoid it, such as when only one metric is needed or when free endpoints would suffice.

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