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

With no annotations, the description carries the full burden, and it does disclose meaningful behavior: results are ordered newest first, capped at 200 periods, and each period carries its 10-K/10-Q, filing date, and SEC link. It does not cover auth requirements or whether the source data is cached, so it falls short of a 5.

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 front-loaded sentences with the core purpose first and the return shape second; no filler. The metric enumeration ('revenue history, net income history, EPS history, cash flow history and more') is mildly redundant with the schema enum but still aids scanning.

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?

For a 4-parameter, read-only retrieval tool with no output schema, the description usefully explains what each returned period contains, which the schema cannot convey. Auth/rate behavior is unaddressed, but the description is otherwise sufficient to invoke 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?

Schema description coverage is 100%, so the schema already documents ticker, metric, period, and limit. The description restates the metric and period options ('by year, quarter or trailing twelve months') without adding syntax, defaults, or edge-case guidance beyond the schema, so the baseline 3 applies.

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 and resource: retrieving the financial history of a single metric sourced from SEC filings, with concrete examples (revenue, net income, EPS, cash flow). It clearly reads as a historical-series tool, but never names or contrasts itself against siblings like get_fundamentals, leaving the agent to infer the distinction.

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?

Usage is only implied: 'history ... newest first' suggests a time-series query as opposed to a snapshot. There is no explicit statement of when to prefer this over get_fundamentals or get_company, and no prerequisites or exclusions are given.

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