upload_object

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

No annotations are provided, so the description carries the full burden. It mentions default behaviors for destination_blob_name and content_type, and states a return value, but it does not disclose whether existing blobs are overwritten, required permissions, or what the 'Result' actually looks like. This is a significant gap for a mutating 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 structured as a Python docstring with a clear purpose sentence followed by Args and Returns sections. It is concise and front-loaded, avoiding unnecessary filler, though the Args list could be more compact.

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 5 parameters, no annotations, and no output schema, the description should provide more complete context. It lacks crucial details about overwrite semantics, error behavior, prerequisites, and the exact shape of the return value. This leaves the agent with ambiguity when invoking the 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%, but the description explains every parameter's purpose and provides default behavior for destination_blob_name and content_type. This adds meaningful context beyond the schema, though it could provide more details on valid formats or constraints.

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 'Upload a file to a Cloud Storage bucket,' which is a specific verb-resource pair. It distinguishes itself from sibling tools like download_object, delete_object, and list_objects by focusing solely on the upload action.

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 when to use the tool (when uploading files to GCS) but does not explicitly mention alternatives or exclusions. No guidance is given on prerequisites like bucket existence or permissions, or when to choose this over other object operations.

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