getEMA

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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, so the safety and external-dependency profile is covered. The description adds essentially nothing beyond that: it doesn't state what the response looks like, how the from_date/to range defaults if omitted, or what happens when periodLength exceeds available history. With annotations carrying the load, this is thin but not contradictory.

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 sentences, front-loaded with the core action and resource, with no redundant restatement of the name. The trailing clause about buy/sell signals is somewhat generic marketing language rather than operational detail, but it is short enough not to be wasteful.

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?

This is a simple read-only indicator tool with a fully documented schema and no output schema. Because no output schema exists, the description could reasonably say what is returned (e.g., a series of dates with EMA values), but it does not; otherwise the definition is adequate for correct invocation.

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 all five parameters (symbol, periodLength, timeframe, from_date, to) are already documented with types and, for timeframe, an enumerated value list. The description adds no additional meaning such as how periodLength interacts with the date range, so the baseline of 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?

The description names a specific verb and resource ('Calculate the Exponential Moving Average (EMA) for a stock') and identifies the underlying endpoint (FMP EMA API). It does not distinguish itself from the many sibling indicator tools (getSMA, getWMA, getDEMA, getTEMA, getRSI), so an agent must infer the difference from the name alone.

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?

The second sentence implies a use case ('analyze trends and identify potential buy or sell signals'), which gives loose context for when to reach for it. However, there is no explicit guidance on when to prefer EMA over SMA/WMA/DEMA/TEMA, nor any mention of prerequisites such as needing a sufficient lookback window for periodLength.

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