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

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety and repeat-call profile is covered. The description contributes useful context about what is being recorded and why (helping Vari8ion locate files), but does not say what happens if a folder was already recorded, whether the value is overwritten or rejected, or whether the path must already exist.

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?

Four short sentences with the purpose front-loaded and no preamble or repetition. The marketing-flavoured closer ("It helps Vari8ion find the files faster") is the only sentence that carries little operational value.

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 three-parameter setter with full schema coverage and clear annotations, the description covers purpose, payload content and optionality adequately. The missing pieces — overwrite behaviour and the dependency on start_project_link — are minor but would have made it 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 path, note and link_id are each documented in the schema with examples and provenance. The description adds no further semantics about path formatting or the note field, so it sits at the baseline for a fully documented schema.

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 opens with a specific verb and resource ("Record where the correspondence folder is") and enumerates the content types it holds, so the agent knows exactly which folder slot this populates. It is distinguishable from siblings like set_drawings_folder by the resource name alone, though it never explicitly contrasts itself with them.

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?

"Optional" tells the agent the call is not mandatory, but there is no explicit when-to-use or when-not-to-use guidance, and no statement of prerequisites (that start_project_link must have run first) beyond what the link_id parameter description implies. Choosing this tool over set_contract_folder or the other folder setters is left entirely to inference from names.

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