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

The readOnlyHint annotation already establishes the safety profile, so the lower bar applies. The description adds essentially nothing beyond structured data: the id-vs-query distinction is repeated verbatim from the id parameter's own description ("Fetch one record by id; omit to query many"), and it says nothing about result shape, clamping of limit, or how sort/fields affect the response.

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 front-loaded sentence with zero filler; the two-mode structure is stated before any detail and nothing is redundant.

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?

Six parameters, a nested MongoDB-style filter object, and no output schema make this a moderately complex tool, yet the description says nothing about what records come back or how pagination behaves. The schema covers most parameter detail, so the definition is workable, but an agent still has to infer return shape and pagination behavior.

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 83%, so the schema already documents id, skip, sort, limit, and the MongoDB-style query filter. The description only echoes the id/query split and adds no syntax, format, or edge-case detail (e.g., what fields projects, or what happens with an empty query). Baseline 3 for high coverage 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?

"Find LimGameChat records" states a specific verb and resource, and the sentence distinguishes the two operating modes (single record by id vs. filtered list). It does not name or contrast any sibling, though the resource name itself is what separates this from the many other query_lim* tools.

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?

It gives a conditional rule for mode selection: pass id for one record, or query for a filtered list. That is guidance between modes of this tool, not between this tool and alternatives, and there is no statement about when not to use it or how to handle broad/unfiltered scans.

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