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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is fully covered structurally. The description's only added value is that the record comes from the 'public directory', implying no auth scoping, but it says nothing about visibility limits, missing-id behavior, or error cases.

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 short but ends mid-sentence at '(fr-...', so it is an incomplete fragment rather than a concise statement. Being truncated is a structural defect, not brevity.

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 no output schema and a truncated description, the agent knows neither what fields a factory record returns nor the id format. For a single-lookup tool this leaves the caller guessing on both input and output.

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 0% for the single id parameter, so the description carries the burden. It says 'by its id' and begins an apparent format hint ('fr-...') that is truncated before conveying anything usable, leaving the identifier's expected shape effectively undocumented.

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: fetch one factory from the public directory by id. That is distinguishable from the sibling factories_search and factory_stats by cardinality (one vs. list/aggregate), though the description never names those siblings.

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?

No explicit when-to-use or when-not-to-use guidance, and no routing to factories_search for lookup-by-attribute cases. The agent must infer the single-record lookup case on its own.

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