analyze_ema_snapshot

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

With no annotations provided, the description discloses a key behavioral trait: it only returns the latest values (not time series). This is useful. However, it does not explicitly state whether the tool is read-only or non-destructive, nor mention auth needs or data freshness.

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?

The description is concise with two sentences, front-loading the purpose and defaults. It wastes no words. However, it could add brief parameter hints without sacrificing conciseness.

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 and 0% parameter description coverage, the description falls short. It explains one parameter (periods) and one behavioral constraint, but leaves three parameters and return format unexplained. More detail is needed for a tool with this complexity.

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. It explains the 'periods' parameter with default values, but does not describe 'pair', 'type', or 'limit'. Only one of four parameters gets meaningful context.

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 clearly states the tool returns latest EMA values, alignment, cross, and slope with default periods 12/26/50/200. It distinguishes itself from siblings like analyze_sma_snapshot by specifying 'EMA' and from prepare_chart_data for charting.

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 description explicitly advises that for time series chart drawing, use prepare_chart_data with indicators. This provides a concrete alternative. However, it does not cover when to use this vs other snapshot tools (e.g., analyze_sma_snapshot).

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