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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds one genuine behavioral trait not in annotations - it computes a contrarian-extreme flag from the equity put/call ratio or VIX - but says nothing about refresh cadence or data provenance.

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 dense sentence, front-loaded with the resource name and followed by the contents, with no filler. It is long but every clause enumerates a distinct data point.

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 an output schema present, the description needn't explain return values, and annotations cover the safety profile; the enumerated contents plus the extreme-flag behavior make it callable. Only the missing usage/routing guidance keeps it from being fully 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 100% and the single enum parameter is fully documented in the schema, so the baseline is 3. The description never mentions the 'type' selector and reads as if all data is always returned, adding nothing about the put_call/vix filtering.

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 names a concrete resource (market sentiment) and enumerates exactly what it contains: VIX level with 1-day/5-day/1-month change and 52-week range, plus Cboe put/call ratios for all products, equities, indices, SPX and VIX options with underlying call/put volumes. That level of detail separates it from get_intermarket and get_macro_context without naming them.

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 statement of when to reach for this tool versus siblings like get_macro_context, get_intermarket or get_market_breadth. The only contextual hint, 'Flags a contrarian extreme', describes output content rather than a use case, so an agent gets no routing guidance.

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