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

With no annotations, the description carries the full burden of behavioral disclosure. It mentions 'real-time' but does not state authentication requirements, rate limits, data freshness guarantees, market-hour constraints, or any error/edge-case behavior. For a financial data tool with zero annotation coverage, this is a significant gap.

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, efficient sentence that front-loads the core resource and then lists key fields. It is appropriately sized for the tool's simplicity, though it lacks a clear introductory verb that would make it more structurally complete.

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, so the description must convey return values, and it does list the key fields returned. However, it omits the format or shape of the response (e.g., whether it is a full chain, paginated, or filtered), which would help an agent understand what to expect.

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% for both parameters (ticker and expiration_date), so the schema already documents them fully. The description adds no further parameter detail, which is acceptable but means the baseline of 3 applies.

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 clearly identifies the resource (equity and index options chains) and lists the specific data fields returned (strike prices, IV, delta, gamma, theta, open interest). It distinguishes itself from sibling tools like getStockEodPrices by focusing on options rather than stock prices, though it does not explicitly name a sibling or state its verb ('get').

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 description gives no indication of when to use this tool versus alternatives, no prerequisites, and no exclusions. It merely lists the data available, leaving the agent to infer that it should be called for options chain data without any explicit guidance.

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