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

No annotations exist, so the description carries the full burden. It usefully discloses the window length (90 trading days) and granularity (daily), which the schema does not. It says nothing about return shape, ordering, error behavior for an invalid tier, or whether the series is point-in-time level only, leaving real gaps for a data-retrieval tool.

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 front-loaded sentence with zero filler; the scope constraint and the parameter domain both appear before any trailing detail. Nothing could be cut without losing information.

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?

This is a simple one-parameter read tool with no output schema and no annotations, and the description adequately conveys the returned content (daily level series over 90 trading days for a single tier). It stops short of describing ordering or units, which is a minor residual gap at this complexity level.

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 coverage is 100% and the single tier parameter already has an enum with a description, so the schema does the heavy lifting. The description merely restates the enum values in parentheses without adding meaning such as what distinguishes hy from ig beyond the name.

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 pairs a specific verb ("Get") with a precisely scoped resource ("90-trading-day daily level series") and names the tier parameter's allowed values. The 90-day daily window implicitly separates it from ncsx_latest and ncsx_weekly, but no sibling is named explicitly.

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 is implied by the scope: an agent can infer this is the tool for a historical daily series rather than the latest snapshot. However, there is no explicit statement of when to prefer ncsx_latest, ncsx_weekly, or ncsx_bond, and no exclusions or prerequisites are given.

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