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

With no annotations, the description carries the full burden, and it delivers meaningful behavioral context: the tool is free, the companion signal endpoint costs $0.05 USDC via x402 on Base L2, and it returns HTTP 402 without an X-Payment header. It also names the backing data sources (AgentWorld economy, x402 settlement pulse, AGWC Uniswap V2 pool, SolvScore) and the published hit-rate endpoint. It does not state side effects or rate limits, but for an info/terms tool this is solid disclosure.

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 dense and largely front-loaded with service marketing and verifiability claims, while the sentence that actually defines this tool ('This tool returns service info and terms') sits in the middle. The topics/horizons enumeration and the ecosystem description consume space with limited payoff for a zero-argument info tool, though each sentence does carry some factual content.

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 values need not be explained, and with no input parameters the description's job is just to orient the agent. It covers the service domain, pricing model, and paid counterpart adequately. The main gap is that it never positions this tool relative to the sizable set of sibling info tools, which would help an agent choose 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 input schema has zero parameters with 100% description coverage, so there is nothing for the description to clarify. The baseline for a zero-parameter tool is 4, and the description adds the relevant enumeration of topics and horizons even though those belong to the signal endpoint rather than this tool's inputs.

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 does state a specific verb+resource for this tool: 'This tool returns service info and terms,' and it explicitly distinguishes itself from the paid signal endpoint by contrasting the FREE info tool against the POST $0.05 signal endpoint. However, that core purpose is buried after three sentences of service marketing, and it never differentiates eds_info from sibling info tools such as diav_info, pclas_info, or tgov_info.

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 '[FREE]' tag and the pointer to the paid signal endpoint imply that an agent should call this first to learn terms before deciding whether to pay at https://agentpaystore.com/eds/api/signal. That is useful routing context, but no explicit when-to-use statement is given and no alternatives among the many sibling *_info tools are named or excluded.

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