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

readOnlyHint=true already tells the agent this is a safe read. The description adds the underlying endpoint (GET /comment), which is mildly useful for debugging, but says nothing about pagination behavior, default result cap (2000), or what a comment record contains. Adequate but thin beyond annotations.

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?

Two short sentences, front-loaded with the core action and followed by the required inputs. The entity-type enumeration is somewhat redundant with the schema but is short enough not to be wasteful.

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?

For a six-parameter filtered list tool with no output schema, the description covers only the two identifying params and ignores pagination and the visibility/createdAfter filters. The schema fills those gaps, but the description does not explain what is returned or how results are ordered, leaving it only minimally complete.

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%, so all six parameters including page, limit, visibility and createdAfter are already documented in the schema. The description duplicates the entityType mapping verbatim rather than adding new meaning such as valid combinations or filter semantics, so the baseline 3 applies.

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?

States a specific verb and resource ('List comments on one record') and scopes it to a single record, which cleanly separates it from list_* siblings that enumerate whole collections. It does not explicitly contrast with the sibling servicetrade_add_comment, but the read vs. write split is obvious from the verb.

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 tells the caller what to pass ('the entity type number and the record id'), which implies the intended call pattern, but gives no guidance on when to use this versus add_comment, nor any prerequisites such as needing a valid record first. Usage is implied rather than stated.

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