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

Annotations already declare readOnlyHint=true and openWorldHint=false; the description goes beyond them by naming the authoritative source (official Ministry of Finance issue letters) and enumerating exactly which figures come back (series code, term, first-period rate, inflation margin, early redemption fee). It does not discuss staleness/refresh cadence, which is the one notable gap for a 'currently on sale' snapshot.

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?

A single well-formed sentence that front-loads the resource and scope before the enumeration of returned fields. The eight-token bond-code list is dense but informative rather than padding; nothing is redundant with the schema or annotations.

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 and no parameters, the description carries the return-value burden and does so by listing the five returned attributes and their provenance. An agent knows what it will receive; only freshness/caching behavior and the explicit sibling routing remain unstated.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; the documented baseline for a parameterless schema is 4. The description correctly avoids inventing filter options that don't exist.

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 (Polish retail treasury savings bonds) and an explicit scope (those currently on sale), plus the exact family codes OTS/ROR/DOR/TOS/COI/EDO/ROS/ROD and the fields returned. It implicitly separates itself from get_polish_savings_bond_series via the 'currently on sale' qualifier, though it never names that sibling outright.

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 'currently on sale' framing implies when this tool applies versus a broader series lookup, but there is no explicit statement of when to prefer it over get_polish_savings_bond_series or get_retail_government_bonds_by_country. Usage must be inferred from the adjectives rather than read from a routing sentence.

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