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 genuinely non-schema behavior: cost of $0.002 USDC per successful call, x402 payment via Base/Solana/Arc, and that failed calls are not charged — material facts an agent needs before calling a paid endpoint. It stops short of stating rate limits or freshness/latency of the snapshot.

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 field inventory is front-loaded and the paid-call caveat is appended where it belongs. Minor waste in the filler phrasing 'Related tools on this server, for a different need' and repetition of the field list that the output schema already encodes.

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-argument, read-only snapshot with an output schema and clear annotations, the definition covers what the agent needs: what comes back, what it costs, and which siblings serve different questions. Only the omission of the nearest alternatives and any note on data freshness keeps it from being fully complete.

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 no parameter semantics for the description to carry. Baseline 4 applies; nothing here adds or obscures meaning.

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?

Uses a specific verb+resource ('Kaspa BlockDAG snapshot') and enumerates exactly what the payload contains (network name, block count, tip hashes, virtual DAA score, difficulty, pruning point, sink hash). It also names crypto_kaspa_hashrate and crypto_kaspa_mempool as the tools for adjacent needs, so an agent can separate it from those siblings without opening a schema.

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?

Gives explicit when-to-use routing for two alternatives (hashrate, mempool), which is real guidance. However, the closest-overlap siblings — crypto_kaspa_block, crypto_kaspa_recent_blocks and crypto_kaspa_metrics_history — are never mentioned, so choosing between a single-state snapshot and those tools is left to inference.

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