setChatAdministratorCustomTitle

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

With no annotations, the description carries the full burden of behavioral disclosure. It clearly states the effect (sets a custom title), the precondition (admin promoted by the bot), and the success return value (True). However, it does not disclose other important behavior such as the bot needing to currently be an administrator with appropriate rights, or what happens on failure. This is adequate but leaves gaps.

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 two short sentences with no filler. The main action and scope are front-loaded, and the return value is included as a useful closing clause. Every sentence earns its place.

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?

The description is mostly complete for a simple three-parameter mutation: it states the action, scope, precondition, and return value. It does not mention that the bot must currently be an administrator with the required rights, which is a meaningful omission for an API call that will fail without it. Given no annotations and no output schema, this is a moderate gap.

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 all three parameters (chat_id, user_id, custom_title) are already fully documented in the schema. The description adds no additional parameter-level detail beyond the generic notion of a 'custom title', so it correctly rests at the baseline for full schema coverage.

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 names a specific verb ('Set') and resource ('custom title for an administrator in a supergroup'), and adds the important constraint that the administrator must have been promoted by the bot. This makes the tool's purpose unambiguous and distinguishes it from related sibling tools like promoteChatMember, which performs the promotion itself rather than setting a title.

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 gives clear context for when the tool applies: only for administrators promoted by the bot in a supergroup. While it does not explicitly name alternative tools or say 'use X instead', there is no direct sibling that competes for the same operation, so the implied usage guidance is sufficient.

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