Publish Carousel Thread

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

Annotations already signal a non-read-only, non-idempotent operation. The description adds useful behavioral context by revealing the three-step container workflow and indicating that publishing is not a single atomic call. It does not discuss failure cleanup or rate-limit fallout, but the core side-effect profile is transparent.

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, front-loaded with its purpose, and uses a clear numbered flow plus a brief Args list. Every sentence adds useful information without 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?

The multi-step process is explained, but there is no output schema and the description does not state what the tool returns after publishing, such as a post ID or URL. Optional parameters like reply_control and response_format are also absent from the narrative, leaving a moderate gap for an agent relying only on the description.

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 coverage is only 40%, and the description partially compensates by defining text as 'Caption text' and clarifying the structure of items. However, it omits reply_control and response_format from its Args block, so the agent still relies on the schema for those two parameters.

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 first sentence names a specific verb ('Publishes'), a specific resource ('a carousel post'), and a concrete constraint ('2–20 images/videos') on Threads. This clearly differentiates it from sibling single-media publishers like threads_publish_image and threads_publish_video.

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 2–20 item range and the explicit three-step flow make it clear this tool is for multi-item carousels. It does not explicitly state exclusions or name alternatives such as single-image tools, but the context is unambiguous enough for an agent to select it correctly.

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