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

No annotations, so the description carries the burden. It discloses ordering ('newest first') and adjustment ('adjusted'), which is real behavioral info. But it omits rate limits, page size defaults, permissions, and error behavior.

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 dense sentence, front-loaded with resource and ordering, then usage constraint. No filler or repetition.

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?

Covers the core data shape and ordering, adequate for a simple read tool. Missing: whether symbol/isin are mutually exclusive or how to resolve conflicts, limit semantics, return structure details, and any failure modes.

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 coverage 0%, so the description must compensate. It clarifies symbol/isin are alternatives ('OR'), which the schema does not state as a constraint. However, the limit parameter and its 1–400 range/default are not explained, and neither is the string format for symbol/isin.

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+resource ('Daily closing prices of one company') with clear scope. Slight ambiguity from 'adjusted' and the parenthetical '(company page chart)', but the core purpose is unambiguous.

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?

'Pass symbol OR isin' implies usage but is a data requirement, not when/when-not guidance. No explicit conditions for choosing this over a sibling — implied context only.

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