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 the 'Pro' access requirement and clarifies the aggregation metric (net premium), but says nothing about return format or limits. Adequate against the lower bar set by annotations.

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?

Two short sentences with the core definition front-loaded and no padding. The dangling 'Pro.' is terse but conveys the access tier, so it earns its place.

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?

For a single-parameter, read-only, open-world tool whose annotations already cover the safety profile, the description conveys what the tool returns (sector-level net premium) and when to reach for it. No output schema exists, but the return concept is stated, leaving only minor detail gaps.

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 the single 'session' parameter (YYYY-MM-DD or 'latest'), so the schema already carries full parameter meaning. The description adds no format or default detail beyond it, making the baseline 3 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 verb and resource: options net premium aggregated by sector for a session. The 'Pro' tag signals access tier. It does not, however, distinguish itself from the near-identical sibling market_tide, which is the main clarity gap.

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 phrase "Use for 'which sectors are seeing bullish options flow?'" gives an implied usage context, but it merely restates the purpose as a question. No when-not guidance and no named alternative (e.g., market_tide) are provided, so routing is left to inference.

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