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

No annotations are provided, so the description must carry the behavioral burden. It lists the returned facts, which helps, but says nothing about read-only safety, error behavior for an unknown code, authentication, or rate limits.

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?

One front-loaded sentence lists the returned fields with no filler. The enumeration is dense but every item is relevant to selecting and understanding the tool.

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?

For a simple one-parameter getter with no output schema, the description does a reasonable job of enumerating return fields. However, it leaves the required 'code' parameter completely undocumented and gives no usage context, so it is only minimally complete.

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 0% and the sole parameter 'code' is never mentioned in the description. The agent gets no indication of what 'code' is, such as the identifier format, source, or expected value.

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 identifies the resource ('One series') and enumerates the specific facts returned, so the agent knows this is a single-series metadata lookup rather than a search or data-point fetch. It does not explicitly name siblings or state how it differs from get_datum/search_series, so a 4 rather than 5.

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?

No guidance is given on when to call this versus search_series (to find a series) or get_datum (for a data point). The agent must infer usage from the name alone; there are no prerequisites, exclusions, or alternative-tool routing.

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