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

Beyond the annotations, the description discloses critical behavior: the memory stays hidden until confirm_upload is called, the size cap is enforced at that point, and the upload headers contain the signed Content-Type. This gives an agent a clear mental model of the side effects and lifecycle, which is exactly what behavioral transparency should provide. No contradiction with annotations exists.

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 compact, front-loaded with the core purpose, and every sentence contributes actionable information. The heavily formatted upload flow and confirmation requirement are communicated without fluff. It packs a lot of necessary protocol detail into a few sentences while remaining scannable.

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 tool with four parameters, no schema descriptions, and an output schema, this description is remarkably complete. It covers the full lifecycle: registration, raw byte upload, required confirmation, visibility semantics, and default namespace behavior. An agent has enough information to invoke the tool correctly and understand what the subsequent steps should be.

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 has zero descriptions for its parameters, so the description carries the responsibility for clarifying them. It explains that description is embedded for recall, that content_type is signed into upload_headers, and that namespace defaults to private. Filename is not explicitly explained, but it is self-evident from the 'file / image / video' framing, so the compensation is strong.

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 opens with a specific verb and resource: 'Register a file / image / video memory and get a URL to upload its bytes.' This clearly distinguishes the tool from related siblings like recall or remember by focusing on the upload registration flow. It also names confirm_upload as the required follow-up, which further differentiates it within the sibling set.

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 gives concrete usage direction: PUT raw bytes to upload_url with upload_headers, then call confirm_upload. It also states that bytes never go through this channel)Skip and that media defaults to a private namespace)Skip providing strong contextual guidance. It stops short of explicitly saying 'when not to use this tool' or naming alternative tools like remember for non-upload memories, so it earns a 4 rather than a 5.

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