fundamentals

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

With no annotations supplied, the description carries the full burden, and it does disclose meaningful provenance: US filers are sourced from SEC EDGAR 'as originally filed', which signals coverage limits and that values are not restated. It says nothing about rate limits, latency, or non-US coverage behavior, and never states this is a read-only operation, but an output schema exists so return shape is covered elsewhere.

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, front-loaded with the resource and its content dimensions, with the provenance caveat placed second. No filler, though the provenance sentence could be tightened slightly.

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?

The tool is simple (two params, output schema present) and the description covers what it returns plus data provenance, which is the main thing an agent needs. Gaps remain on parameter formats, default as_of behavior, and how it differs from the financial_statement sibling.

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 0%, so the description must compensate and largely does not. The phrase 'as of the date' does attach point-in-time meaning to the as_of parameter, but no format, default behavior, or semantics for ticker (exchange, US-only expectation) are given.

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 names a specific resource (company fundamentals) and enumerates the content dimensions returned: valuation, profitability, growth, balance sheet strength. It does not explicitly distinguish itself from the sibling 'financial_statement', which is the nearest ambiguous alternative.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no alternative is named. At best, 'as of the date' weakly implies a point-in-time snapshot versus a full statement tool, but the agent must infer that routing decision itself.

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