MySQL JSON Index Suggest

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

Annotations already declare readOnlyHint=true and destructiveHint=false, indicating a safe read operation. The description adds context about the tool's purpose (suggesting indexes) but does not elaborate on behavioral traits such as how the suggestion is derived, data sources used, or any limitations.

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 a single clear sentence that conveys the core purpose without unnecessary words. However, it could be slightly expanded to include context like the required parameters or typical usage without losing 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 the tool has 6 parameters, no required parameters, and an output schema, the description is incomplete. It does not explain what inputs are necessary (e.g., a table and JSON column) or how the sampleSize parameter is used. The schema descriptions are basic and do not clarify the aliasing confusion. The tool's complexity is not matched by the description.

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?

The input schema has 100% description coverage with basic descriptions for all 6 parameters. The description does not add any extra meaning beyond what the schema provides. For example, the relationship between 'col', 'column', and 'tableName' aliases is not clarified. Baseline of 3 is appropriate given the schema coverage.

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 uses a specific verb 'Suggest' and defines the resource as 'functional indexes for frequently accessed JSON paths', making the tool's purpose clear. It distinguishes this tool from siblings like mysql_create_index (which creates indexes) and mysql_json_stats (which provides statistics).

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 no guidance on when to use this tool versus alternatives. There is no mention of prerequisites, typical use cases, or when not to use it. Sibling tools like mysql_create_index, mysql_get_indexes, and mysql_json_stats could perform related functions, but no differentiation is given.

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