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

Annotations only provide readOnlyHint=true. Description adds data scope (pain curve, dealer alignment, pin probability) and time range, but doesn't disclose apiKey behavior beyond schema, rate limits, or error handling. With annotations lowering the bar, this is adequate but not rich.

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?

Single sentence, front-loaded with the key verb and resource. 'Alpha tier' is a minor extra but doesn't waste space; the description is concise and well-structured.

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?

No output schema exists, but the description names the returned data types (max pain, pain curve, dealer alignment, pin probability). It lacks mention of pagination or large response, but for a single-point historical query this is adequate given the sibling context and schema richness.

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 descriptions cover all 3 parameters (at, apiKey, symbol) at 100% coverage. Description does not add parameter-specific semantics beyond the schema, so baseline 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?

Description uses verb 'Replay' and specifies the resource (max pain, pain curve, dealer alignment, pin probability) plus time range since April 2018. This clearly distinguishes from current max pain tool and other historical siblings.

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 phrase 'at any minute since April 2018' implies usage for historical analysis, providing clear context. However, it doesn't explicitly name alternatives like get_max_pain for current data or state when not to use it, so it lacks exclusions.

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