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

Annotations already declare readOnlyHint=true and idempotentHint=true, so the safety profile is known. The description adds useful context by enumerating exactly which indicators are computed and noting they are based on daily price history, which clarifies scope without contradiction.

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 well-structured sentence that front-loads the action and resource, then lists indicators in a compact, readable list. No filler words; every item adds value.

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 the output schema exists (so return format is covered), one parameter, and annotations covering safety/idempotency, the description fully addresses the tool's scope and inputs. No significant gaps remain.

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 single parameter (ticker) is fully described in the schema with an example, and the description adds nothing beyond the schema. With 100% schema coverage, the baseline of 3 is appropriate; the description does not need to elaborate further.

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 uses a specific verb ('Calculate') and explicitly names the resource ('technical indicators for a ticker'). It lists concrete indicators (SMA, RSI, MACD, etc.), which clearly distinguishes it from sibling tools like get_price_history or get_relative_strength.

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 implies the tool is used when you need these specific technical indicators, and the detailed indicator list makes the use case clear. However, it does not explicitly state when NOT to use it or name alternative tools for overlapping analyses, so it stops short of a 5.

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