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

Beyond the annotations (which already indicate non-read-only and non-destructive), the description adds meaningful behavioral context: it creates a rename revision and avoids reuploading bytes. This gives the agent insight into the operational effect and efficiency of the operation.

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 a single, well-structured sentence that front-loads the core purpose (rename or move) and follows with key constraints (same-bucket, by blob reference, no reupload). Every phrase earns its place with no redundancy.

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?

Given the simple single-file rename operation and the presence of an output schema (which covers return values), the description is adequately complete. It clearly scopes to one same-bucket path and explains the revision behavior, though it does not cover edge cases like destination existing or permission requirements.

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 input schema provides complete descriptions for all 4 parameters (100% coverage), so the schema already carries the parameter semantics. The tool description does not add parameter-specific meaning beyond that, and the 'by blob reference' phrase is more about internal behavior than parameter semantics.

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 explicitly states the tool renames or moves one same-bucket file path by blob reference, creating a rename revision without reuploading bytes. This clearly distinguishes it from siblings like bucket_file_copy or bucket_file_move by scoping to same-bucket operations and emphasizing the no-reupload behavior.

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 same-bucket usage and mentions 'without reuploading bytes' as a key characteristic, but it does not explicitly state when to use this tool over alternatives such as bucket_file_move or bucket_file_copy. No exclusion conditions or alternative tool references are provided.

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