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

Annotations already declare readOnlyHint=false and destructiveHint=true; the description adds non-obvious behavioral context by stating 'Projects cannot be deleted from here' and that the id is returned. That irreversibility note is exactly the kind of disclosure annotations alone can't convey, though permission requirements and side effects on existing projects are still unstated.

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 action and result, with each sentence adding distinct information: what it creates, what it returns, and a limitation.

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?

It covers the return value despite there being no output schema and flags the no-delete limitation, which suits a mutation tool with annotations. However, with 0% schema description coverage on two parameters, the description leaves the inputs fully undocumented, a meaningful gap for a creation tool.

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% and the description never mentions the two parameters (name, emoji) or their constraints such as required vs optional. With no compensation for the coverage gap, an agent must infer everything from the bare schema.

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 and resource ('Creates a project') and adds domain meaning ('one more site or brand under the account') plus the return value. It is clearly distinguishable from list_projects, though it does not name a sibling explicitly.

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?

Gives a concrete follow-on workflow: 'Pass that id as the project argument on later calls to work inside it,' which tells the agent why and when to invoke this before other operations. It offers no explicit exclusions or alternatives guidance, which keeps it short of a 5.

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