Publish Image Thread

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

Annotations indicate readOnlyHint=false and destructiveHint=false, implying a mutating operation (publishing). The description adds no additional behavioral context beyond that, such as authentication requirements, rate limits, or side effects like creating a new post. For a mutation tool with sparse annotations, the description should explain more, but it doesn't.

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 concise with one clear sentence. However, it includes an 'Args' list that duplicates the schema parameters, adding redundancy without new information. The structure is acceptable but not optimally front-loaded; the core purpose is stated first, but the args list is unnecessary given 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?

The tool has 6 parameters but no output schema, and the description does not mention what the tool returns (e.g., post ID) or any error conditions. It also fails to mention three optional parameters (location_id, reply_control, response_format) that an agent might not discover without opening the schema. The description is incomplete for a publish operation with multiple options.

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 83%, so most parameters are already documented. The description adds the clarification that image_url must be 'Public URL of the image (JPEG or PNG)', which is a slight enrichment over the schema's 'Public image URL'. However, it omits location_id, reply_control, and response_format, which are covered by the schema. The added value is marginal.

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 'Publishes an image post to Threads' with a specific verb and resource. It clearly distinguishes from text/video/carousel publish tools by mentioning 'image'. However, it doesn't explicitly say this is the tool to use for image posts only, though the name reinforces that. The purpose is clear but not exceptionally detailed beyond the name.

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 description provides no guidance on when to use this tool versus alternatives like threads_publish_text, threads_publish_video, or threads_publish_carousel. It simply states what it does without any context about choosing it over siblings. An agent has no explicit direction on selection criteria.

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