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

Annotations already declare readOnlyHint=true, so the description adds value by noting 'Free, no key needed' and listing metadata fields. However, it doesn't disclose rate limits, pagination, or edge cases like non-existent series. The description is adequate given the simple read-only nature.

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 a single sentence that is front-loaded with purpose and lists key fields. Every word is essential, and it avoids redundancy.

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 tool with one parameter and no output schema, the description lists metadata fields but does not specify the return format (e.g., object vs array, JSON structure). It is fairly complete for its simplicity but could still clarify the series_id format and provide usage examples.

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 must provide parameter semantics. The only parameter 'series_id' is not explained at all (e.g., format, examples, how to obtain it). The description adds no meaning beyond the schema, which just lists it as a string.

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 it provides 'Full metadata for one econ series' and lists specific fields like title, frequency, geography, etc. It distinguishes from siblings like 'get_econ_series' (which likely returns data values) and 'search_econ_series' (searching).

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 mentions it's 'Free, no key needed,' which is helpful for usage context. It implies this tool is for metadata rather than data values, but does not explicitly state when to use vs alternatives like 'get_econ_series'.

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