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

Annotations already flag destructiveHint=true and idempotentHint=true, and the description adds the crucial why: each field replaces the old value with no history, so prior values are unrecoverable, and it advises confirming wording with the user. That is exactly the extra context annotations cannot convey.

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 tight sentences with the field scope front-loaded and the lossy-replacement warning immediately after. Every clause carries information an agent needs before calling.

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 7-parameter mutation with no output schema, the description covers partial-update behavior, irreversibility, and the confirmation requirement, which is the essential picture. It doesn't say what the call returns (e.g., the updated project object), a minor gap given there is no output schema to fill it.

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 86%, so the schema already explains formats for style, outline, light and palette. The description reinforces the field list and adds the replacement semantics, but adds no format or syntax detail beyond what the schema documents. Baseline 3 is appropriate.

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 leads with a specific verb ("Change") and resource ("a project") and enumerates every mutable field (name, style, description, light, outline, palette), so an agent knows exactly what capability this is. It doesn't explicitly name siblings like create_project or get_project, so differentiation is inferred from the verb rather than stated.

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?

"Only the fields you pass change" and "confirm wording with the user first" give clear operational guidance about partial updates and when caution is required. It stops short of explicit when-to-use/when-not guidance against alternatives such as create_project or get_project, which would have earned a 5.

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