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

Beyond the annotations, the description discloses that the file persists immediately, overwrite defaults to false, the agent bearer token is required, public files are world-readable while private files need credentials, and stored files are inert and not executed. It also clarifies content encoding and retrieval behavior, adding substantial behavioral context not present in the structured fields.

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 long and not front-loaded, beginning with example-path caveats before stating the tool's core action. It contains several useful operational details, but the structure could be tightened so the primary purpose and alternatives appear first. It is adequate rather than efficient.

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 tool's mutation semantics, 0% schema description coverage, and the existence of an output schema, the description covers the necessary usage, permissions, alternatives, and parameter semantics. It does not need to explain return values because an output schema is present, and it supplies enough context for safe invocation.

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?

With schema description coverage at 0%, the description compensates well by explaining path relativity, separator rules, and prohibited leading slash/backslash/dot traversal; bucket public/private readability; content as a UTF-8 string; content_type for JSON; and overwrite defaulting to false. It omits some schema details such as exact max lengths and the default text/plain content type, but still adds meaningful semantics for every parameter.

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 implies the tool saves a text or JSON file into an agent's storage namespace and mentions content, persistence, and the binary/oversized alternative. However, the opening sentence is about example path caveats rather than the core action, so the purpose is not front-loaded. It still distinguishes itself from createStorageUpload for binary or large files.

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 explicitly routes agents to createStorageUpload for binary files or text above max_text_bytes, and explains that retrieval should be done via POST /api/v1/storage/downloads using the returned download_url. It also gives clear context on when public versus private bucket files are appropriate. This is an explicit when/when-not/alternative treatment.

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