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

With no annotations, the description carries the burden well by disclosing that session_date may be older than today and by summarizing return contents such as named levels, prices, market regime, and desk-read excerpt. It still lacks explicit notes on permissions, rate limits, and error behavior, but for a read-only lookup tool this is strong disclosure.

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 front-loaded with the core purpose and avoids filler. It is reasonably sized, though the middle sentence is dense and could be tightened for easier scanning.

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 annotations, the description usefully explains the key return fields and the session-date staleness caveat. It still omits exact symbol format and any access constraints, but it is nearly complete for a simple one-parameter read tool.

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%, so the description must compensate for the single symbol parameter. It identifies the parameter as an instrument and gives examples like NQ and ES, but does not clarify exact string format, casing, or validation rules.

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 states a specific resource and scope: the newest published free levels for one instrument, with examples such as NQ and ES. It does not distinguish the tool from siblings get_paths or list_symbols, so it falls short of a 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?

There is no explicit when-to-use or when-not-to-use guidance, and the sibling tools are not mentioned as alternatives. The research/education-only note hints at intended use, but it is not actionable routing guidance.

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