create_sync_watchlist

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

Annotations already signal idempotency and non-destructiveness. The description adds the concrete behavior that this is a POST to /sync/watchlist and that the body fields should be discovered from the schema/GET endpoint. It does not discuss duplicate handling or response details, but annotations lower the burden here.

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 and front-loaded: one action sentence, the endpoint, then the body guidance. There is no filler, and every line earns its place.

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 single-parameter endpoint with an output schema and annotations covering idempotency, the description gives the essential invocation path and directs the agent to the schema for the flexible body. It is slightly incomplete in not naming the corresponding GET or common body examples, but the open-world body may not be enumerable statically.

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 only provides an opaque body object with additionalProperties true, so the description's note that body is the request payload and to read the matching GET or /schema for expected fields adds useful meaning. However, it does not describe any concrete fields or shapes, leaving the agent dependent on another endpoint.

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 and resource: 'Add items to watchlist' and gives the exact endpoint POST /sync/watchlist. It distinguishes the add behavior from sibling remove/reorder tools primarily through the verb 'Add', but it does not explicitly name those alternatives.

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 usage is implied: use this tool to add items to the watchlist. It also provides a prerequisite by saying to read the matching GET or /schema endpoint first, but it does not explicitly say when to prefer this over update/remove/reorder siblings or give exclusions.

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