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

Annotations already declare readOnly, idempotent, non-destructive behavior, and the description adds two pieces of context not in annotations: the required `tasks:read` API-key scope and the page/size pagination model. That is genuine value beyond structured fields, though return shape and default sizes are unstated.

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?

Three short, front-loaded sentences covering purpose, pagination, and auth scope. No filler or redundancy; each sentence carries distinct 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?

For a simple read-only list tool with strong annotations, 83% schema coverage, and no output schema, the description covers purpose, pagination style, and scope requirement. Only minor gaps remain (default page size, whether reactions include user info).

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 coverage is 83%, so the schema already documents most parameters in detail (including the 1–100 size bound). The description's 'page/size' note adds only a light hint that these form a pagination pair, which the schema already implies. 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?

The description specifies a concrete verb and resource ('List reactions on a task comment'), which is distinguishable from its sibling mutation tools pm_add_comment_reaction and pm_remove_comment_reaction. It doesn't explicitly name those siblings, but the read semantics are unambiguous.

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?

Usage is implied by 'List reactions on a task comment' and the required taskIdentifier/commentIdentifier pair, but there is no explicit guidance on when to prefer this over related tools or what preconditions exist beyond the API-key scope. Adequate but not instructive.

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