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 safety profile is covered. The description adds genuinely useful context beyond that: the underlying plan is unaffected and the operation requires Administrator/ProjectManager permissions. The trailing sentence about "each answer compares the scenario with the plan" is irrelevant to a delete and muddies the behavioral picture slightly.

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?

The opening and the "plan is untouched" clause are well front-loaded, but the final sentence describing how "each answer compares the scenario with the plan... both project end dates" is leftover from a read tool and does not earn its place in a delete definition. It wastes space and risks confusing the agent about the return value.

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 scope, permission requirement, and non-propagation behavior are covered, which is good for a destructive tool with no output schema. However, the stray sentence implying a comparison result is returned conflicts with the fact that no output schema exists, leaving the agent uncertain about what deletion returns.

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?

With one parameter at 100% schema description coverage, the schema already explains "id". The description adds nothing specific about the id (e.g., where to obtain it), so the baseline 4 applies rather than a higher score.

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?

"Throw a scenario away" is a concrete verb+resource, and the description immediately clarifies what a scenario is ("a private copy of one project's dates") and distinguishes it from the plan and from apply_scenario. An agent can tell this apart from siblings like apply_scenario or delete_project without opening a schema.

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 states the key context: the plan is untouched and changes only matter via apply_scenario, implying this is for discarding an experimental scenario. It does not explicitly say when not to use it (e.g., versus apply_scenario to commit changes), so it stops just short of full routing guidance.

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