get_market_status

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

No annotations provided. The description only lists possible return values without detailing behavior such as timezone, latency, or whether it's a simple read operation. With no annotations, the description should offer more context.

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?

Single sentence of 9 words, perfectly concise and front-loaded with the key information. No filler.

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?

Minimal but adequate for a simple tool with no parameters and an output schema. Lacks details on response format or interpretation of the three states.

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?

Zero parameters and 100% schema coverage. The description adds value by specifying the three possible output states, which goes beyond the empty schema.

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 states it returns current US market status with three specific values: open, closed, extended-hours. This is a distinct resource compared to sibling tools like get_aggregates or get_snapshot.

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 explicit guidance on when to use this tool versus alternatives. However, it is the only sibling tool that mentions market status, so it's implied as the go-to for that purpose.

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