start_thread

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

With no annotations, the description carries the behavioral burden, and it does state the core side effect: creating a new thread. However, it does not disclose what the tool returns, whether the operation is idempotent, or how the optional member_name mention behaves beyond the schema.

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, information-dense sentence with no filler or redundant restatement. It front-loads the primary action and is easy to parse.

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?

For a low-complexity create operation with a complete schema and an output schema available, the description is nearly sufficient. The main gap is the lack of explicit usage guidance, but an agent can still select and invoke the tool correctly using the name, description, and sibling context.

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?

The input schema has 100% description coverage, so the baseline applies. The description repeats title and content details already in the schema and adds nothing about the optional member_name parameter, though that parameter is fully documented in 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 identifies the action ('start') and resource ('a new thread') and distinguishes it from sibling operations like update_thread, read_thread, and list_threads. The inclusion of 'title and content' reinforces the purpose without ambiguity.

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?

Usage is implied by the word 'new' and by contrast with sibling tool names, but there is no explicit statement about when to choose this over update_thread or read_thread. An agent can infer the intended case, but the guidance is not explicit.

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