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

Annotations already declare readOnlyHint=false, idempotentHint=false and destructiveHint=false, so the safety profile is covered. The description adds the return contents (link_id, price, share steps for the client's cloud), which is useful since there is no output schema. It does not disclose whether an external link/record is created on the client side, what auth or connected cloud account is needed, or why repeat calls are non-idempotent.

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?

Two short sentences, action first and return contents second, with no wasted wording. Every clause conveys something an agent needs.

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 six-parameter mutation with full schema coverage and no output schema, the description covers the action and the returned fields but leaves the side-effect surface and follow-up path unstated. It is adequate but thin for a tool that initiates an external linking workflow.

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%, including enum explanations for service and account_type, so the schema carries parameter meaning fully. The description adds only the loose framing of 'one project' and 'the client's cloud' and does not clarify how company/project/contact fields feed the link creation. 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?

The description states a specific verb and resource: 'Start linking one project to Vari8ion.' An agent knows this initiates a link for a single project. It does not, however, differentiate itself from close siblings like send_project_link or get_link_status, so it stops short of the top score.

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?

'Start linking' plus the promise of a returned link_id implies this is the entry point of a multi-step flow that later calls consume the link_id. That is implied usage guidance only — there is no explicit when-to-use, no prerequisites, and no statement of when to prefer send_project_link or get_link_status instead.

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