sendMediaGroup

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

With no annotations provided, the description carries the behavioral disclosure burden. It discloses the album grouping constraint (documents/audio must be grouped with same type) and notes the return value is an array of Messages. However, it omits other behavioral details such as permission requirements, error behavior, or rate-limit implications.

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 sentences with no wasted words. The core action is front-loaded, and the second sentence adds essential grouping constraints and return information that directly informs invocation.

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 tool with a fully documented 10-parameter schema and a clear description, the definition is reasonably complete. It covers the key grouping rule and the return type, which compensates for the lack of an output schema. Minor gaps remain around usage context and error cases, but the core invocation needs are met.

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 fully documents all parameters. The description does not add parameter-level meaning beyond what the schema already provides, so the baseline score of 3 is appropriate.

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 the tool sends a group of photos, videos, documents, or audios as an album, which is a specific verb-resource action. It distinguishes this from sibling single-media send tools (sendPhoto, sendVideo, etc.) by emphasizing the album/group aspect.

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 implies usage for sending an album rather than a single media message, but it does not explicitly state when to prefer this tool over alternatives or when not to use it. No exclusions or explicit alternatives are given.

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