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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered; the description adds real context beyond that by promising a deterministic result with issues and row provenance, and by stating it never connects to an HMI or PLC. It does not say anything about input limits or failure modes, so it falls short of a 5.

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 sentences ordered action-first, then routing condition, then return/behavior guarantees — no filler. Slightly redundant in restating equivalence with check_hmi_import_csv, which keeps it from a perfect score.

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 rich annotations, no output schema, and a thin input schema, the description carries the right load: it explains what is returned (deterministic result, issues, row provenance) and that no external HMI/PLC is touched. Only the parameter-level contract is left thin, which is a modest gap for a compatibility alias.

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 0%, so the description must compensate, and it only partially does: the three CSV types named in the text (tags, digital alarms, analog alarms) map to the three parameters, but format expectations, mutual exclusivity, and the fact that all three are optional (empty defaults) are unstated. Meaningful but incomplete compensation.

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 names a specific verb and resource ('Check supplied FactoryTalk View tag, digital-alarm or analog-alarm CSV text before import') and explicitly frames the tool as a compatibility alias that mirrors check_hmi_import_csv. An agent can distinguish it from the canonical sibling without opening either schema.

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 states the exact condition that selects this tool ('Use this compatibility name when an existing FactoryTalk Preflight connection exposes audit_factorytalk_import') and names the alternative it is equivalent to (check_hmi_import_csv). Nothing about routing is left to inference.

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