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

The annotations already state readOnlyHint=false and destructiveHint=false, so the description's 'state-changing action' is consistent but not additive. It adds an 'After authorization' nuance and clarifies the mutation is on the filename, yet it doesn't disclose side effects, reversibility, or permissions beyond the annotations.

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 two sentences with a clear first-sentence trigger and a second sentence stating the action. There is minor redundancy ('state-changing action' adds little), but it overall remains short and readable.

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 two-parameter tool with full schema descriptions and no output schema, the description provides enough context about what is renamed and when to use it. The only minor gap is the absence of any mention of effects on existing references (e.g., share links), but not enough to mark it incomplete.

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?

The schema already defines both parameters with descriptions and coverage is 100%. The tool description doesn't add much meaning beyond the schema, and the schema's note to call list-generations first effectively covers the important prerequisite.

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 specific action — rename an existing generated result — and identifies the exact effect: updating the filename for a generation_id. It distinguishes its purpose from related actions like archive or restore, though it doesn't explicitly name sibling alternatives, so it misses the highest bar.

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 opens with an explicit use-this-when condition: 'when the user wants to rename an existing generated result.' That gives clear context for invocation, but it doesn't mention when not to use it or directly compare with sibling tools like set-generation-definitive-version, which would warrant a 5.

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