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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds behavior beyond that: a live 'TVL suddenly crashing' alert mode (which explains the non-idempotent result set) and the payment/auth model ($0.005 in USDC via x402 or prepaid credits, free trial). These are useful operational facts the annotations do not carry.

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 first sentence is dense and front-loaded with the useful payload. However, the trailing 'Filters: Price: $0.005...' fragment is mislabeled and dangling - it calls pricing a 'filter' while omitting the actual filter parameters, which is mildly confusing structure and waste.

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-value detail is not required, and the description still summarizes the payload plus a live-alert mode. All five params are schema-documented. Coverage is good, though the missing when-to-use guidance is a small gap for a data tool in a crowded sibling set.

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?

Schema description coverage is 100%, so all five filters (days, chain, limit, protocol, minAmountUsd) are already documented in the schema. The description does not add format, default, or syntax detail beyond that, so the baseline 3 applies.

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 verb+resource: it delivers 'recent crypto hacks and exploits (DeFi, bridges, exchanges) from DefiLlama's database' and enumerates the returned fields (date, amount, technique, chains, funds returned, totals, live TVL-crash alerts). This is content-distinct from siblings like defi-protocol and defi-yields, so an agent can tell what it fetches without opening the 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?

The description never says when to reach for this tool versus alternatives (defi-protocol, token-safety, etc.), nor what prerequisites apply. Usage is only implied by 'recent hacks,' with no exclusions or routing to siblings.

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