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

Annotations already declare non-readonly, non-idempotent, non-destructive, so the safety profile is covered. The description adds genuinely non-obvious context: approval requirements are org-configurable and business workflow approvals always apply. However it does not say what happens on rejection, whether the call blocks, or any required permission scope.

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?

It is short and front-loads the verb, but the second sentence about approvals is bolted on and the first sentence is content-free filler. Nothing in it earns its place beyond the approval note.

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?

Despite an output schema, this is a write tool with a nested object of five undocumented fields and no explanation of what a milestone column is, how it relates to milestones or the matrix, or what a successful creation returns structurally. Too much is left for the agent to guess.

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 0% and the description provides no meaning for any field. The nested 'data' object's opaque fields (taskTemplateId, phaseTemplateTaskId, displayOrder, isActive) are left entirely unexplained, so an agent cannot know which are required for a valid creation or how they interact with milestones.

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 restates the tool name ('Create milestone_column') without explaining what a milestone column is or what creating one entails. 'Using the same business service as the screen' references an unnamed UI screen and adds no distinguishing information versus siblings like create_milestone, reorder_milestone_columns, or update_milestone_column.

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?

There is no statement of when to use this tool versus list_milestone_column, update_milestone_column, reorder_milestone_columns, or create_milestone. The approval sentence describes a policy, not a usage condition or prerequisite check an agent can act on.

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