income-statements

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

No annotations provided, so description carries full burden. It discloses the data source (Yahoo Finance, free, no API key) and pricing, but does not cover rate limits, error handling, or behavior for invalid tickers.

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?

Long single paragraph but efficiently packs key information (metrics, periods, source, pricing). Could be more structured with bullet points, but no repetition and each sentence 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 no output schema, description explains what the tool returns (list of financial metrics) and covers main purpose and parameters. Lacks details on data currency or formatting, but sufficient for basic use.

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 has 100% description coverage for 3 parameters. Description adds value by explaining defaults (quarterly up to 8, annual up to 4 years, limit default 4) and how limit interacts with period, enhancing understanding beyond 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?

Clearly states it returns full income statement and cash flow history for US public stocks, specifying the metrics included and distinguishing quarterly vs annual periods. However, it does not explicitly differentiate from sibling tools like equity-fundamentals or stock-brief, which may overlap.

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?

Implies usage context by describing quarterly and annual periods and mentioning source and pricing, but provides no explicit guidance on when to use this tool over alternatives or when not to use it.

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