create_thread

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

There are no annotations, so the description carries the full burden of behavioral disclosure. It reveals that the thread is public and that creation can occur from a channel or a message, but it does not mention permissions, side effects, response format, or failure conditions. This is a meaningful gap for a mutation tool.

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 a single front-loaded sentence with no filler or redundant information. It efficiently states the action, resource, and the two creation contexts in the fewest possible words.

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 schema fully covers inputs, and the description clarifies the dual modes of thread creation, which is helpful. However, the absence of an output schema and annotations means the description should probably disclose what the tool returns and any authorization requirements. For a simple create operation, it is minimally sufficient but not complete.

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 100%, so the schema already documents all four parameters. The description adds no additional parameter-level detail beyond the schema; the mention of 'or from a message' lightly reinforces the optional message_id parameter but does not enrich it.

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 uses a specific verb ('Creates') and resource ('new public thread'), and further specifies the context: 'in a Discord channel or from a message.' This clearly distinguishes it from siblings like send_message or get_message, even without naming an alternative.

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 implies when to use the tool: when a new public thread needs to be created. However, it provides no explicit guidance about when not to use it, prerequisites, or alternatives. There is no direct mention of scenarios where another tool would be more appropriate.

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