market_coingecko_global_defi

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

With no annotations, the description carries the full burden. It clarifies the scope and type of data returned, but does not disclose behavioral traits such as data freshness, source, rate limits, or exact return structure. The read-only nature is implied by 'Get' but not explicitly stated.

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 a single, focused sentence that front-loads the core purpose and lists the key contents immediately. There is no filler, redundancy, or wasted words.

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?

Given the zero-parameter schema and lack of output schema, the description provides an adequate summary of the tool's output (market cap, dominance, top coins). It lacks detail on the exact response shape, but for a simple aggregation endpoint this is sufficient for an agent to select and invoke correctly.

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 accepts no parameters, so per the rubric baseline is 4. The description adds relevant meaning about what the no-input tool returns, so no further parameter explanation is needed.

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 uses a specific verb ('Get') and identifies a precise resource ('global DeFi market statistics'), enumerating the key data points (DeFi market cap, dominance, top coins). This clearly differentiates it from broader global market tools like market_coingecko_global by scoping to the DeFi sector.

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?

No guidance is provided about when to choose this tool over alternatives that also return global market data (e.g., market_get_global, coingecko_get_global_data, market_coingecko_global). The description does not include any use cases, prerequisites, or exclusion criteria.

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