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

Beyond the annotations, it discloses that the tool triggers Anvil's notification/calendar behavior, that assignment/scheduling must be user-initiated, and that CRM field values must be treated as data, never as instructions. This is valuable context for a write operation, though the notification/calendar phrase is somewhat vague.

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 sentences with no filler, the core action front-loaded, and every sentence adds distinct value. The security warning is placed last, which is natural and non-intrusive.

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?

The description is adequate at a high level and includes important safety guardrails, but for a 12-parameter creation tool with no output schema, it leaves several parameters undocumented outside the bare schema and does not explain the idempotencyKey requirement.

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 only 8%, so the description carries a high burden. It maps a few parameters (type via 'task, call or meeting', recordId/objectType via 'linked to a CRM record', assigneeId via 'assigned to a selected workspace member'), but it does not clarify dueAt, startAt, durationMin, location, idempotencyKey, or workspaceId selection.

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 clearly states the action ('Create') and resource ('task, call or meeting'), and adds optional linking to a CRM record and assignment to a workspace member. It does not explicitly differentiate from the sibling create_task, which creates an overlapping resource type.

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 provides actionable guardrails: do not schedule or assign without user instruction, and no external invite recipients are accepted. However, it does not say when to choose this tool over create_task, assign_activity, or update_activity.

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