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

With no annotations, the description carries the burden and does disclose valuable operational behavior: per-call pricing of $0.02 USDC, and precisely where payment must go (X-Payment / X-Payment-Tx / Bearer fg_… headers, not parameters) — that prevents a class of failed calls. It still omits failure behavior, rate limits, caching, and what a symbol miss returns.

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 core purpose is front-loaded, but the body is bilingual duplication: the indicator list and the payment argument list are each stated twice (Chinese then English), and '参数同左' points at content the reader may not have. Roughly half the text is redundant, though nothing is actively misleading.

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 compensates well by enumerating the returned indicator fields and the trend-score range. However, for a paid four-parameter tool with zero schema coverage, the absence of parameter formats, default interval/limit behavior, and any explicit contrast with indicator_now leaves real gaps.

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% and all four parameters are bare titles, so the description needed to compensate. Instead it merely restates the parameter names (symbol、interval、limit、exchange) and adds a meaningless cross-reference ('参数同左'), giving no format, allowed interval values, default window, or exchange identifier convention.

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 the concrete output set (SMA20/50/200, EMA12/26, MACD three lines, ATR14 plus percentage, Bollinger bands with width, volume ratio, range high/low with distance, trend score 0-6), so an agent knows exactly what the tool returns. It does not explicitly contrast itself with the sibling tech-indicators.indicator_now, leaving the 'full' qualifier to imply the difference.

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 trigger phrase 'what do the technical indicators say' gives an implied usage context, and 'full' hints this is the heavyweight version versus indicator_now. There is no explicit when-to-use/when-not statement, no prerequisite (e.g. required interval or exchange defaults), and no direct alternative routing.

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