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

With no annotations, the description carries the full burden. It does provide some behavioral context: the news is '[FREE]', 'live', aggregated from specific sources, and filterable by category. However, it does not mention rate limits, freshness windows, pagination behavior, or whether any authentication is needed, which are useful for a live-news endpoint.

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 compact and front-loaded: it states the action and resource first, then names sources and filters. There is no filler or repetition of schema content, and every clause 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 simple optional-parameter news fetch with an output schema present, the description is nearly complete: it defines the domain, source list, and category vocabulary, and the output schema covers return values. The main gap is the undocumented 'limit' parameter, but the schema's default value mitigates the risk.

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 0%, so the description must compensate for the undocumented parameters. It adds value by enumerating valid values for 'category' ('bitcoin, ethereum, defi, ai-agents, coinbase, solana, x402'), but it does not explain 'limit' or how it interacts with the result count. This is partial compensation for a two-parameter tool.

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 and resource: 'Get live crypto and AI news' from named sources, aggregated by AgentWorld CCN news engine. It also lists filter categories, making the tool's function unmistakable and distinct from the sibling tools, none of which target news retrieval.

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 'live crypto and AI news' clearly defines when to use the tool, and the filter list ('bitcoin, ethereum, defi, ai-agents, coinbase, solana, x402') signals concrete use cases. It does not explicitly name alternatives or exclusions, but no comparable news tool exists among the siblings, so no such guidance is necessary.

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