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

Annotations already declare mutation, idempotency, open-world behavior, and non-destructiveness. The description adds material context beyond that: authenticated storage, base64 transport, a 2 MiB MCP request limit including encoding, a 100 MiB API/CLI capacity, and the required idempotency key.

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 four short sentences, front-loaded with the core purpose and then operational constraints. It is compact and avoids repeating schema details without adding value.

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?

It covers the core purpose and critical operational limits, which is important for an upload tool. However, with no output schema and 0% schema description coverage, it omits return behavior and file path/array semantics that an agent may need to invoke the tool correctly.

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%, so the description must carry parameter meaning. It clarifies base64 encoding and that an idempotency key is required, but it does not explain files[].path, the files array structure, the 1024-item cap, or the idempotency_key maxLength, leaving most nested parameter semantics undocumented.

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 states a specific action (store/upload file bytes) and resource (authenticated exact file bytes) with timing context: before a submission transaction. It is clearly an upload tool rather than a retrieval tool, though it does not explicitly contrast with prepare_artifact_submission or confirm_artifact_submission.

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 clear usage context (before a submission transaction) and an alternative path for larger files: API/CLI or exact GitHub commit import. It does not spell out when not to use this tool or compare directly against sibling submission-preparation tools, but the size-based routing guidance is useful.

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