rename_thread

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

Annotations already indicate this is a non-read-only, idempotent, non-destructive operation. The description adds valuable side-effect context by noting that 'Talk posts a "thread renamed" system message into the thread' and states the authorization requirement. No contradiction with annotations exists.

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 front-loaded with the core purpose, then follows with permission, side effect, and a structured Args/Returns section. Every sentence adds necessary information with no filler, making it appropriately sized for a 3-parameter tool.

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 that an output schema exists, the description need not detail return values, yet it still notes the updated thread shape. It covers purpose, permissions, side effects, and all parameter semantics, leaving no critical gaps for an agent to invoke the tool correctly.

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 fully compensates for all three parameters. It explains token ('Use list_conversations to find tokens'), clarifies thread_id as 'the ID of the thread's first message', and enriches title with constraints ('must not be blank', 'Talk shortens titles longer than 203 characters').

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 opens with 'Rename a thread in a Talk conversation', a specific verb and resource that clearly differentiates this from siblings like get_thread, list_threads, and set_thread_notification_level. No other sibling tool performs a rename, so the purpose is unambiguous.

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?

It explicitly states who is allowed to rename ('Only the author of the thread's first message or a conversation moderator'), giving a clear precondition for use. It does not explicitly name alternatives, but the operation is unique among siblings, so the context is clear and no exclusions are needed.

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