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

With no annotations, the description carries the full burden, and it does disclose the composite side effects (writes to NAS, submits a remote DIS job) — a meaningful trait beyond the schema. But it omits cost/credit implications, job lifecycle (async vs sync, what job ID comes back), and any failure or overwrite behavior for an 8-parameter mutation tool.

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?

Front-loaded with the core action in the first sentence, which is good. But the second paragraph spends a full sentence on self-promotion ('This is the main public differentiator from multi-step MCPs') that does not help an agent decide or invoke correctly.

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?

An 8-parameter composite mutation tool with zero annotation coverage and zero schema descriptions requires a much richer description. The presence of an output schema excuses explaining return values, but the caller is left without any understanding of four required parameters or the side effects of the NAS upload and credit consumption.

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% for 8 parameters, so the description must compensate and it largely does not. Only target_objects gets semantic explanation (face/body/car); key_index, key_name, file_path, file_name, file_type, restoration, and encrypt_object_label are entirely undocumented anywhere.

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 first sentence names a specific verb and resource ('image anonymization') and clarifies that it composes two steps: upload to NAS then submit the DIS job. It implicitly separates itself from upload_file/submit_encrypt_job by describing the composite behavior, though it never explicitly names encrypt_video as the video counterpart.

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 gives one concrete usage hint (target_objects=["face"] for a single-call detect-then-blur/redact) and mentions body/car for person/plate masking. However, the stated 'alternative' is a generic comparison to multi-step MCPs rather than the actual siblings, and it never says when to call this versus submit_encrypt_job or encrypt_video.

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