create_thread_chat

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

With no annotations, the description carries full burden. It discloses the creation action, required condition, and return value. However, it does not detail error scenarios or auth requirements, which are common for such tools.

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 and well-structured: purpose first, then precondition, then parameter list, then return. Every sentence adds value with no redundancy.

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?

Given the tool has 3 parameters and an output schema, the description covers purpose, prerequisites, parameters, and return value. It lacks error handling details but is otherwise complete for a creation tool.

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 0%, but the description explains each parameter in the Args section: parent_chat_id as 'ID of the chat to branch from,' post_no as 'Post number to root the branch at,' and title as 'Optional title.' This adds substantial meaning beyond the schema.

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 clearly states 'Create a branch (thread) chat rooted at a specific post in another chat,' using a specific verb and resource. This distinguishes it from sibling tools like create_group_chat and create_private_chat.

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 a clear prerequisite: 'Requires the parent chat to have allow_branch=True.' It implies when to use (branching from a post) but does not explicitly mention alternatives or when not to use, leaving some ambiguity with sibling build_conversation_thread.

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