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

Annotations already declare this is a non-destructive, idempotent, closed-world write, so the safety profile is covered. The description adds the intent behind the write (helping Vari8ion locate files faster) but does not say what happens to a previously recorded path, nor that link_id must come from start_project_link (only the schema note says that).

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 action stated first and optionality flagged early. The clause explaining what the folder holds is mild but earns its place by disambiguating "programme" terminology; nothing is padded or repeated.

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 3-parameter write tool with full schema coverage, annotations, and no output schema, the description covers purpose and optionality adequately. It leaves unclear the ordering relative to sibling folder setters and overwrite semantics, which matter for an idempotent write that other tools depend on.

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% and all three parameters are documented in-schema, including where link_id comes from and what path looks like. The description adds no parameter-level meaning beyond that, 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?

"Record where the programme folder is" is a specific verb plus resource, and the follow-up sentence clarifies what that folder contains (the programme/schedule and its updates). It is clearly distinguishable from the other folder-setting siblings by resource, though it never names an alternative to contrast with.

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" is the only usage signal: it tells the agent the call is not mandatory, which is genuinely useful. There is no explicit when-to-use condition, no prerequisite order relative to start_project_link or the other set_*_folder tools, and no statement about which sibling to pick when a folder could be classified more than one way.

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