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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, so the safety profile is covered. The description adds real value beyond that: the $0.01 USDC per-successful-call pricing via x402 on Solana, and the equivalent HTTPS endpoint, which are material to an agent deciding whether and how to invoke it. It does not mention rate limits or failure/refund behavior for paid calls.

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?

Three sentences, front-loaded with the search scope, then the return payload, then the payment/transport detail. No filler; each sentence carries distinct information. Slightly dense but well ordered.

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 compensates well by enumerating the returned fields (document number, title, type, agencies, action, abstract, citation, effective/comment-close dates, EO number, docket ids, RINs, HTML/PDF links). Combined with full schema coverage for inputs, an agent has enough to call it correctly; only refund/failure semantics for the paid call are unaddressed.

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 nine parameters are already documented with types, formats, and defaults. The description's parameter-related content (agency names, short names, slugs, type filters, date ranges) largely restates what the schema already says. Baseline 3 is appropriate.

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 and resource ("Search the U.S. Federal Register") and enumerates the document classes covered (rules, proposed rules, notices, presidential documents, executive orders) plus the filterable dimensions. This clearly separates it from siblings like sec_edgar_search or usaspending_awards, which target different corpora.

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 tells the agent what dimensions can be filtered and gives a concrete example of agency shorthand ("EPA"), so a caller knows how to frame a query. It stops short of stating when to prefer a sibling tool (e.g., SEC filings vs. Federal Register) or what happens if zero results match, so no explicit exclusions or alternatives.

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