ugreen_create_file

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

Annotations already declare destructiveHint=true, readOnlyHint=false and openWorldHint=true; the description adds real value on top with the 16 KiB ceiling, the fail-if-exists default, octal mode semantics, the token+NASS-account permission model, and a failure protocol (query state, no auto-retry). However, it never explains dry_run, which is the one behavior an agent most needs to know before a destructive write, and 'fails when exists' sits awkwardly with idempotentHint=true. That tension plus the dry_run blind spot keeps this below 4.

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?

Every clause carries information — limits, alternative, defaults, permissions, failure protocol — with no filler. The downside is that six distinct facts are compressed into a single unstructured paragraph, making the dry_run omission and the failure-handling rule easy to skim past.

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 destructive write tool with no output schema, the description covers limits, exclusivity, permission source and post-failure behavior well. The gaps are the undocumented dry_run flag and the absence of any statement about what a successful create returns or how paths are interpreted.

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% across 5 params, so the description must carry the load. It does define content (UTF-8, may be empty, ≤16 KiB), exclusive (default true, fails if exists) and mode (octal), but path and especially dry_run are left entirely unexplained. Three of five parameters covered is adequate but incomplete.

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?

States a specific verb+resource ('创建一个 NAS 文件') and immediately scopes it (UTF-8 text, ≤16 KiB), which is far more than a restatement of the name. It explicitly routes oversized/binary content to ugreen_upload_file. It does not address the overlapping sibling ugreen_write_file, so an agent still has to guess the create-vs-write boundary.

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?

Gives an explicit when-not and named alternative: '更大或二进制内容使用 ugreen_upload_file'. The exclusive=true default also implicitly communicates create-only semantics. The missing piece is guidance against ugreen_write_file, the sibling most likely to be confused with this one.

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