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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds context that this is public research data with no account access or fund transfers, which is slightly beyond annotations but not substantial. It does not contradict annotations, and the extra context is useful though minimal.

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 four sentences, front-loaded with the main purpose, immediately followed by sibling routing, and then security notes. It is concise with zero filler, precisely earning its length.

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 the high schema coverage (100%) and the presence of an output schema, the description need not explain return values. It covers purpose, usage routing, and safety. The only vague element is 'needs base URL,' which is an ambiguous prerequisite not tied to any parameter, but overall the description is sufficiently complete for an agent 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 coverage is 100%, so all parameters are already explained in the schema. The description does not add parameter-specific guidance beyond mentioning a base URL, which is not clearly tied to a parameter. Since the schema carries the burden effectively, the baseline of 3 is appropriate.

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 fetches recent trade prints (tapes) from Gate, which is a specific verb+resource. It explicitly differentiates from siblings by naming get_orderbook for depth ladders and markettrend_get_kline for trend-index bars, so an agent can immediately identify its unique purpose.

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 provides explicit routing instructions: 'Depth ladder→get_orderbook' and 'Trend-index bars→markettrend_get_kline.' This tells the agent when to use this tool versus alternatives. It also adds a prerequisite ('needs base URL') and clarifies it is for public research only.

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