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

Annotations only declare readOnlyHint=true and openWorldHint=false; the description goes well beyond them by disclosing ordering, the closeAt bidding deadline in UTC, the status lifecycle (scheduled, announced, held, cancelled), and the fact that results appear only after issuer publication. It stops short of pagination limits, data freshness, or coverage caveats, so it is strong but not exhaustive.

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?

Front-loaded with the core scope and ordering, then a single dense sentence enumerating returned fields. Every clause carries information, though the long field inventory makes it read more like documentation prose than a crisp tool summary.

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 carries the return-value burden and does so thoroughly, listing the auction day, closeAt, instrument, tenor, CUSIP/ISIN, size, status, result page/format, and result fields plus their availability timing. Combined with fully documented parameters, an agent has everything needed to call and interpret it.

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%, with each of from/to/issuer documented including defaults and accepted issuer codes, so the baseline is 3. The description adds nothing about parameter format or interactions beyond what the schema already states.

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 names a specific resource (government bond auctions) narrowed by issuer scope (US Treasury, German Finanzagentur, Italian Treasury) and a date window, and states the ordering (soonest first). An agent can distinguish it from siblings like upcoming_decisions or dataset_health without opening the schema.

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?

Usage context is implied by 'date window, soonest first' and the closing 'Facts only, no forecasts', which signals a read-only calendar rather than an analytics tool. However, it never says when to prefer this over a sibling tool or what preconditions apply (e.g., what happens when no auctions fall in the window).

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