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

Annotations already declare readOnlyHint=false, idempotentHint=false, and openWorldHint=true, and the description reinforces the non-idempotent nature while adding a genuinely new side effect: it fires the project.created webhook. It does not explain the destructiveHint=true annotation (what, if anything, gets displaced), leaving one behavior unexplained.

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?

Three short sentences, front-loaded with the trigger condition and tightly scoped. 'Each call creates another project' mildly restates the non-idempotency annotation, but the redundancy is small and arguably useful emphasis.

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 one-parameter creation tool with an output schema and rich annotations, the description covers purpose, trigger, exclusions, non-idempotency, and the webhook side effect. An output schema exists, so the brief mention of returned fields is sufficient and nothing an agent needs is missing.

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 'name' parameter is already documented with its 1-120 character bounds. The description adds no format, uniqueness, or naming-convention guidance beyond the schema, so the baseline of 3 applies.

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 and resource ('create one Imagelato image project') and states the grouping purpose (processed batches and resize presets). It also draws an explicit boundary against a related sibling capability ('Not for adding a resize preset'), so the agent can separate this from add_template.

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 supplies a clear triggering condition ('Use this when the user wants to create one Imagelato image project') plus an exclusion, and warns that 'Each call creates another project'. It stops short of naming an alternative sibling tool for edge cases, so it is strong but not fully routed.

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