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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds genuine context beyond that: the data source (Deribit), the derivation method for OI change (hourly snapshots), and the interpretive limit (descriptive, not a direction signal). It does not cover latency, pagination, or whether an underlying with no listed options returns empty versus errors.

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 capability list is front-loaded and every clause names a distinct metric, so little is wasted. It is one very long run-on sentence, which makes it slightly harder to scan than a bulleted enumeration, but nothing is redundant.

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?

There is no output schema, and the description compensates by enumerating nearly every returned field, so an agent knows what to expect. The main residual gaps are source coverage (Deribit only — no mention of fallbacks) and the empty/error case, which matter for a read-only analytics call of this breadth.

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%, so currency, expiries, and trades_hours are already documented including defaults and maxes. The description only reinforces that the tool operates on one underlying and implies a recent trade-flow window; it adds no format or edge-case detail (e.g. case sensitivity of the symbol, behavior when trades_hours=0). Baseline 3 is appropriate.

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?

States a specific resource (crypto options positioning for one underlying on Deribit) and enumerates the concrete outputs: OI in coins/USD, put/call ratios, strike concentrations, expirations, max pain, OI change, trade flow. This is clearly distinguishable from siblings like options_chain or options_gamma, which cover different slices of options data.

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 closing caveat "Descriptive positioning — not a direction signal" gives useful framing on intent, but no sibling is named and there is no explicit when-to-use/when-not-to-use guidance versus options_chain, options_gamma, derivatives_flow, or research_positioning. Usage is implied by the content list rather than stated.

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