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

With no annotations, the description carries the full burden. It does not disclose whether this is a read-only operation, what the 'UW chain' source implies, whether the flag is computed or stored, or any latency/rate considerations. The phrase 'from the UW chain' hints at a data source but adds little behavioral clarity.

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 compact sentence with no filler. It front-loads the core concept. However, it is so terse that it sacrifices clarity for brevity, so it does not earn a 5.

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?

The tool has an output schema, so return values may be documented there, but the description still lacks context about what the wing-fattening flag means, how to interpret the skew strip, and when this tool is relevant. For a niche options tool with no annotations, this is a meaningful gap.

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. It does not explain the 'symbol' parameter at all, though the parameter name and default 'SPY' are self-explanatory. The description adds no meaning about how symbol affects the skew strip or wing-fattening flag. Baseline is 3 because the single parameter is trivially inferable.

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 'IV smile / skew strip + wing-fattening flag from the UW chain' identifies a specific resource (IV smile/skew strip) and a derived flag (wing-fattening), and the verb is implied as retrieving. It is somewhat jargon-heavy and does not clearly distinguish it from siblings like get_rails or get_gex_profile, but it does convey a distinct options-market concept.

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 about when to use this tool versus alternatives. The description does not mention any conditions, exclusions, or related sibling tools. An agent would have to infer usage from the name and jargon.

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