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

No annotations exist, so the description carries the full burden. It does disclose meaningful behavior: rows are aggregated from four valid standalone quarters, and each row exposes field_name, value, and period_end. It says nothing about authentication, currency/units, or failure behavior when fewer than four standalone quarters exist, which are the real risks for a TTM endpoint.

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, no filler, with the core scope statement front-loaded before the return-shape detail. The line break and indent are cosmetic noise but nothing is wasted.

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?

With no output schema, the description steps in to name the returned row fields (field_name, value, period_end), which is the key missing piece for an agent consuming results. It stops short of units, currency, or what happens when fewer than four valid quarters exist, but is adequate for a read-only financials fetcher.

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 is 100%, so the schema already documents kind (IS/CF), symbol formats, and type. The description only adds the negative constraint that BS is unsupported for kind, which is genuinely additive but marginal. Baseline 3 is appropriate when the schema does the heavy lifting.

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 ('Get') and resource ('TTM income/cash-flow rows') plus the aggregation rule (four valid standalone quarters). This clearly separates it from siblings like get_financials_annual, get_financials_latest, and get_dividends_ttm, and the scope limit 'kind=BS is unsupported' sharpens the boundary further.

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?

Provides one useful when-not signal ('kind=BS is unsupported'), which implies balance-sheet data must come from a different tool. However, it never names the alternative sibling (e.g., get_financials_annual) or states prerequisites such as needing a resolvable symbol, so usage is only implied rather than directed.

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