get_latest_date

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

Annotations declare readOnlyHint=true. The description adds critical behavior: eCFR lags behind the Federal Register, and using today's date causes 404 errors. It also discloses that the tool raises ValueError for reserved titles (1-50). This adds value beyond the annotations.

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 concise with three short paragraphs, each earning its place: purpose, critical usage, title specifics. No unnecessary information. Front-loaded with the action.

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 tool's simplicity (one optional parameter, output schema exists), the description covers all essential aspects: purpose, usage pattern, critical timing, error cases, and title guidance. An agent can correctly select and invoke this tool.

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?

With 0% schema description coverage, the description fully compensates. It explains the default title 48 (FAR system) and lists common titles with context. It also notes that reserved titles raise errors. This adds significant meaning beyond the schema.

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 clearly states the tool's purpose: 'Get the most recent available date for a CFR title.' It specifies the action (get) and the resource (latest date for CFR title), and distinguishes itself from siblings by positioning it as a preliminary step for other tools.

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 explicitly tells when to use the tool: 'Call this first to get the safe date, then pass it to other tools.' It warns about the lag (1-2 business days) and the consequence of not using it (404 errors). It also provides default and common title numbers, guiding usage.

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