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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the write/impact profile is covered structurally. The description adds two pieces of non-annotated context: the record persists in history (reversibility/retention behavior) and that explicit confirmation is required. It does not state what happens to linked data, though the retention claim is arguably in mild tension with destructiveHint=true.

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 with the action and its retention outcome front-loaded and the confirmation requirement second. No filler, nothing that restates the title.

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 output schema exists so return values need not be described, and annotations cover the destructive profile. However, a mutation tool with zero schema-description coverage and a confirmation flag should say what confirmation gates and whether an archived modification can be restored, which the description omits.

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%, so the description carries the load for three required parameters. It explains the intent of 'confirmed' ('requires explicit confirmation') but says nothing about the expected format of vehicleId/modificationId or whether confirmed must be true to proceed, leaving the semantics mostly to the schema types.

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+resource pairing ('Mark a modification canceled') and adds the key semantic twist that it 'remains in vehicle history', which differentiates it from delete_vehicle_modification. It stops short of naming that sibling explicitly, so an agent must infer the soft-delete nature from the retention clause.

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?

Usage is implied by 'so it remains in vehicle history' — use this instead of hard deletion when history must be preserved — but no alternative is named and no preconditions (ownership, permissions, archived-state idempotency) are given. It is adequate but leaves the choice between archive_vehicle_modification, delete_vehicle_modification, and update_vehicle_modification to inference.

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