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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds meaningful behavioral context by disclosing the $0.005 USDC per-call cost and the x402 payment endpoint, which is information not present in the annotations. It does not cover data freshness, rate limits, or failure behavior, but it adds substantial payment and access context.

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 sentences and is front-loaded with the tool's purpose and returned metrics. The second sentence adds necessary payment context without unnecessary detail, so every sentence earns its place.

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 read-only network status tool with one optional parameter and no output schema, the description is largely complete. It names the key metrics returned and explains the payment mechanism, though it does not describe the response shape, units, or data freshness in detail.

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?

There is only one optional parameter, and the input schema fully documents the x402 PAYMENT-SIGNATURE usage, including how omitting it triggers a free trial or payment requirements. The description does not discuss the payment parameter directly, but schema coverage is 100%, so the baseline of 3 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 a specific resource and scope: Solana mainnet health, with explicit metrics including current slot, block height, epoch progress, and recent TPS. It is clear what the tool returns, though it does not explicitly differentiate itself from sibling Solana tools such as solana_recent_transactions or solana_priority_fees.

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 phrase 'in one call' implies this is an aggregate health snapshot rather than a tool for querying individual metrics, which gives some usage context. However, it does not explicitly say when to use this tool instead of sibling Solana tools, nor does it state exclusions or prerequisites beyond the payment note.

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