create_sync_history

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

Annotations already establish that this is a mutating, idempotent, open-world, non-destructive call. The description adds the concrete effect ('Add items to watched history'), the exact endpoint, and guidance to discover the expected body shape before sending, which is useful operational context beyond the annotations. There is no contradiction.

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 tightly structured: a one-sentence purpose, the endpoint, and a brief Args note. All information is front-loaded and every line earns its place. There is no redundant filler.

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 an open-world POST with an output schema, annotations covering idempotence/safety, and an opaque body parameter, the description provides enough orientation: what the tool does, where it posts, and how to discover the required fields. It does not detail authentication or success responses, but the output schema and explicit schema-discovery instruction cover the main gaps.

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 schema only exposes an opaque required body object with additionalProperties allowed, and schema description coverage is 0%. The description compensates by labeling body as the request payload and instructing the agent to consult the matching GET or /schema endpoint to learn expected fields. This is meaningful, actionable guidance for an open-world body.

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 verb and resource: 'Add items to watched history.' It also gives the exact endpoint (POST /sync/history), making the tool's role clear and distinguishing it from related sync tools that handle collection, ratings, watchlist, or removal.

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 intended use is explicit: use this tool when you want to add items to a user's watched history. It also provides a clear prerequisite by telling the agent to read the matching GET or /schema endpoint before constructing the body. It does not explicitly compare against create_sync_history_remove, but the operation is unambiguous enough that this is not a major gap.

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