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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=false, covering the safety profile. The description adds one genuinely useful piece of context beyond that: the required 'asset_replacement_plans:write' scope. It does not say what happens on duplicate plans, whether the call is validated against the referenced asset, or what errors to expect.

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, zero filler, with the purpose stated first and the access requirement second. Nothing to trim.

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 mutation tool with full annotation coverage and a complete input schema, the description covers the essentials: what it creates and the scope needed to call it. Since no output schema exists, a sentence about the returned plan identifier would have made it fully self-sufficient, but the gaps are minor.

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%, so the schema already documents all 7 fields including enums and constraints. The description adds nothing about parameters, which is acceptable here but earns only the baseline 3.

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 gives a specific verb+resource ('Create a new asset replacement plan'), which is unambiguous and matches the tool name. However, it offers no differentiation from dozens of sibling create_* tools (e.g., create_asset, create_asset_betterment), so an agent must infer scope from the name alone.

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 guidance on when to use this tool versus update_asset_replacement_plan, list_asset_replacement_plans, or the other create_* variants. The only condition stated is the required scope, which is an access prerequisite rather than usage guidance.

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