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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is partially covered. However, the description adds nothing beyond that: it does not say whether renaming a key is reversible, whether it must be unique, whether references to the old key break, or what permissions are required for this mutation.

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?

A single short sentence with the key information front-loaded and zero filler. It is efficient, though its brevity reflects under-specification rather than disciplined conciseness.

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 simple two-parameter mutation with annotations and a fully described schema, the description is minimally sufficient to invoke the tool. It still omits the consequences of the rename and any uniqueness or permission constraints, which matter for a write operation.

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 both project_id and key are documented in the schema itself, and the baseline is 3. The description merely restates 'key' without adding format, uniqueness, or validation constraints beyond what the schema provides.

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 states a verb and resource ('Update a project's key'), which is more specific than the bare name, but it is minimal and does not clarify whether the key is a name, an identifier, or a reference, nor how this differs in scope from update_concept or update_work_item. It is adequate but leaves ambiguity an agent could stumble on.

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 alternatives such as update_concept, update_work_item, or delete_project. No prerequisites, permissions, or exclusions are mentioned, so the agent must infer usage entirely from the name.

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