create_conversation_message

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

Annotations already indicate this is a non-destructive write operation. The description adds the requirement of a transcript or attachment, but does not disclose additional side effects, permissions, or error handling. With annotations present, the description's transparency is adequate but not enhanced.

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 three sentences, but the structure is somewhat jumbled. The threading tip could be integrated better, and the requirement statement feels abrupt. It is not verbose but could be clearer.

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 5 parameters, no output schema, and the need to explain required fields, the description is incomplete. It does not explain the 'id' field, the 'links' array, or the 'from_message_type' enum. The high schema coverage partially compensates, but overall context is lacking.

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 80%, baseline 3, but the description fails to add meaning for the required 'id' parameter (likely the conversation_id) and misaligns by referring to 'parent_id' while the actual parameter is 'from_message_id'. This confusion reduces semantic value.

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 it sends a message to an existing conversation, differentiating from siblings like create_direct_message. However, the phrase 'or any type with a conversation_id' is somewhat vague and could be clarified.

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 includes a threading tip (using a parent_id) but does not provide explicit guidance on when to use this tool versus alternatives (e.g., create_direct_message). No when-not-to-use or prerequisites beyond 'must provide transcript or attachment'.

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