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

Annotations already establish this as a safe read (readOnlyHint=true, openWorldHint=false), so the bar is lower. The description does add one useful behavioral fact: all compared patterns resolve against one shared market/timeframe/side filter. It says nothing about what the comparison output contains or ordering, leaving a real gap for a multi-entity operation.

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?

A single sentence, front-loaded with the verb and the 2-10 bound, with zero filler or redundant restatement of the title. Every clause carries information.

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 is the only place to learn what a side-by-side comparison returns (metrics, table shape, ordering), and it stays silent. The input side is adequately covered, but the result side is not, which matters for a tool whose whole purpose is producing a comparison.

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%, with enums and defaults documented inline for side, market, and timeframe, so the schema already carries the parameter meaning. The description repeats the shared market/timeframe/side framing without adding syntax or constraints beyond the schema; 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?

Names a specific verb ("Put ... side by side") and resource (patterns), and the constraint of a shared market/timeframe/side makes the operation concrete. It does not explicitly contrast with siblings like get_pattern_stats or search_patterns, which is the only thing keeping it from a 5.

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 2-to-10 pattern range implies a multi-pattern comparison scenario versus single-pattern lookups, so usage is inferable. However, there is no explicit when-to-use, no mention of when a single-pattern tool such as get_pattern_stats is the better choice, and no prerequisites stated.

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