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

Annotations already communicate readOnly, openWorld, idempotent, and non-destructive behavior. The description adds meaningful extra context: the endpoint is paid, costs $0.50 USDC via x402 on Base, and the output is 'sourced' and 'agent-ready.' This goes beyond the annotations by disclosing cost and delivery semantics, though it does not discuss rate limits or authentication details.

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 two sentences with no filler. The first sentence packs the core deliverable and its contents, and the second gives the endpoint and pricing. 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?

With no output schema, the description adequately enumerates what the brief will contain: up to ten matches, eligibility signals, deadline urgency, award ranges, and next actions. It also covers the critical cost and endpoint facts. It could mention error handling or authentication, but those are not essential given the annotations and the OpenAPI contract reference in the input schema.

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?

There are zero parameters, so the baseline is 4 and the description does not need to explain parameter meaning. The input schema is a placeholder pointing to the linked OpenAPI contract, which is acceptable given no required parameters exist. The description adds endpoint and cost context instead of parameter details, which is appropriate here.

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 says exactly what the tool does: 'Produce a sourced agent-ready brief of up to ten current U.S. federal grant matches' with specific content dimensions such as eligibility signals, deadline urgency, award ranges, and next actions. This distinguishes it from sibling tools like federal-grant-search or federal-grant-detail by emphasizing a consolidated brief rather than raw search or single-record detail.

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 use case is implied by the description: an agent should call this when it needs a synthesized brief of grant opportunities. However, it gives no explicit guidance on when to prefer this over sibling tools, nor does it state exclusions like 'use federal-grant-detail for full award text' or 'use federal-grant-search for exhaustive results.'

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