sync_now

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 physical setup requirements and the shape of the return value (count of new items and pending corrections). What it omits is the mutation profile: it never states that transcripts are written into the library, whether repeated calls are idempotent, how long a sync takes, or what happens if the device is not connected. The environment caveats are valuable, but the side-effect picture is incomplete for a write-ish sync operation.

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?

Three short, front-loaded sentences: what it does, the prerequisite to check before calling, and what comes back. Every sentence carries distinct information and nothing repeats the tool name or restates the schema.

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 zero-parameter tool with no output schema, the definition covers the essentials: the action, the runtime preconditions, and a summary of the return value. It would be complete if it also flagged the state-changing nature of the sync, since no annotations exist to signal that.

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 tool takes zero parameters, and the schema has nothing to document. Per the baseline for parameterless tools, a 4 is appropriate; the description does not need to explain argument meaning because there are no arguments.

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 names a concrete sequence: connect a recording device, download not-yet-fetched recordings in full, and transcribe them into a raw text version. The "（原始版）" qualifier separates this raw transcription from the corrected/edited transcripts that siblings such as get_transcript or correction_guide presumably deal with. It stops short of naming an explicit alternative, so the sibling distinction is implied rather than stated.

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 supplies real preconditions: the user must be physically at the computer and must shut down Feishu on the phone. Those conditions tell an agent when this call is appropriate, which is more than most definitions offer without annotations. It does not explicitly say when NOT to use it or which sibling to prefer when a transcript already exists.

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