setChatTitle

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

With no annotations, the description carries the behavioral disclosure burden and handles it well: it reveals the mutation (change), the restriction on private chats, the authorization requirement, and the success return value ('Returns True on success'). It does not describe failure behavior, but the covered context is substantial for a simple operation.

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?

Three concise sentences with no wasted words: purpose first, then constraints, then return value. Every sentence contributes meaning and the structure is front-loaded for quick comprehension.

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 simple two-parameter, no-output-schema tool, the description plus full schema coverage fully equips an agent. It covers the action, key exclusions, required permissions, and success return, making the definition complete without being verbose.

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 both chat_id and title. The description adds no extra meaning beyond restating that the title is being changed, which is the baseline expectation. No additional parameter-level nuance is offered.

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 'Change the title of a chat', a specific verb and resource that plainly states the tool's core function. It is distinct from sibling tools like setChatDescription or setChatPhoto, and the additional constraints (private chats, admin rights) further clarify what this tool does.

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 clearly states when not to use the tool ('Titles can't be changed for private chats') and the required permission ('bot must be an administrator with can_change_info rights'). It provides solid conditional guidance, but it does not explicitly mention alternative tools or compare to them, so it stops short of a 5.

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