pre_open_market

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

No annotations are provided, so the description must disclose behavioral traits. It only says 'Pre-open market data for the given index key' without detailing what data is returned, whether it is real-time, any auth requirements, rate limits, or other side effects. The description is too thin to inform the agent about behavioral nuances.

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 short sentence, which is structurally concise. However, it is under-specified rather than efficiently informative, omitting details that would help in tool selection and invocation. It earns its place but could be more useful.

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?

Given that there is no output schema, no parameter schema descriptions, and no annotations, the description alone must make the tool fully understandable. It fails to explain what 'pre-open market data' consists of, which index keys are valid, or what the response looks like. This is insufficient for an agent to use the tool correctly.

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?

The schema exposes a single parameter 'key' with no description, and the description refers to it as an 'index key', adding some semantic meaning beyond the bare property name. However, it does not enumerate accepted values, format, or relationship to the default 'NIFTY', so the compensation is partial.

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 states that the tool provides pre-open market data for an index key, which clearly identifies both the resource ('pre-open market data') and the parameter ('index key'). It is distinguishable from siblings like live_index or index_history due to the explicit 'pre-open' qualifier, though it lacks an explicit action verb like 'get' or 'fetch'.

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 guidance on when to use this tool versus alternatives such as live_index, market_status, or all_indices. It does not mention any context, prerequisites, or exclusion criteria.

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