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

Annotations already indicate readOnlyHint=false, so the write nature is known. The description adds valuable behavioral details: it reserves a subdomain, enforces slug regex, checks availability, and explains quota-dependent error behavior. These go beyond the annotation's minimal safety signal.

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 description is three sentences long, front-loads the primary purpose, and includes only necessary details. It avoids repetition and every clause adds information.

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 description covers the core action, slug constraints, and quota behavior, but omits any explanation of the name parameter or the return value. Given the tool's simplicity and lack of output schema, these gaps are notable but not fatal; an agent could still call it correctly if it knows name is a project label.

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 must compensate. It explains the slug parameter's regex and reservation requirement, but offers no explanation for the name parameter. The agent cannot infer what name represents or whether it is required, leaving a significant semantic gap.

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 clearly states the action ('Create a project') and the resource involved, including the reserved subdomain pattern. It distinguishes itself from siblings like create_account or deploy_project by specifying the exact output of reservation and slug constraints.

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?

The description implies this tool is for creating projects but does not explicitly contrast it with alternatives or state when not to use it. It provides context about quota limits, which hints at when failures occur, but lacks direct guidance on selecting this tool over others.

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