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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the destructive and repeatable nature is covered. The description adds the required 'project_milestones:write' scope, which is genuinely useful auth context, but says nothing about cascading effects on dependent tasks or milestone references.

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 tightly written sentences with the action and the target resource front-loaded and zero filler. Every clause carries information.

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 single-param delete with annotations already covering the destructive/idempotent profile and a fully documented schema, purpose plus auth requirement is nearly enough. The only real gap is downstream/cascade behavior of deleting a milestone, which an agent might want before calling.

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 the single 'id' param is fully documented as a UUID 'Project milestone ID'. The description's 'by ID' merely restates the schema, so the baseline 3 is appropriate with no added semantics.

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?

States a specific verb ('Delete') and resource ('project milestone') scoped 'by ID', which is unambiguous and readable against the many delete_* siblings. It does not explicitly differentiate itself from get_/update_/list_project_milestone, but the resource naming is precise enough to route correctly.

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 update_project_milestone or the other delete_* siblings, nor any prerequisite/confirmation guidance beyond the scope note. It tells the agent what it does but not when it is the right choice.

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