forwardMessages

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does meaningful work by disclosing partial-failure semantics ('if some ... can't be found or forwarded, they are skipped'), restrictions on service messages and protected content, and that album grouping is preserved. This is above-average transparency for a mutation-like tool, though it omits permission or rate-limit context.

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 compact and information-dense: four sentences, each adding a distinct useful fact. It front-loads the primary purpose and then covers failure behavior, content restrictions, grouping behavior, and return value. There is no redundant phrasing or restatement of the tool name.

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 batch forwarding method with fully documented parameters and no output schema, the description covers the important operational semantics: partial failures, non-forwardable content, album behavior, and the success return type. It does not spend space explaining return values in detail, which is acceptable without an output schema, but it could have noted permission requirements or contrast with copying alternatives.

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 all seven parameters. The description adds a little contextual meaning by explaining that unspecified messages are skipped and album grouping is retained, which clarifies message_ids behavior. This meets the baseline but does not go beyond what a well-documented schema plus behavioral notes already provide.

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 core action: 'Forward multiple messages of any kind' and specifies the return type. It distinguishes itself from the singular forwardMessage by emphasizing batch operation and album grouping. However, it does not explicitly name sibling alternatives or contrast with copyMessages, so differentiation is partially left to the tool name and context.

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 no explicit guidance about when to choose forwardMessages over forwardMessage, copyMessages, or copyMessage. It implies batch usage by saying 'multiple messages' and describes skip behavior, but it never states conditions for selecting an alternative. This leaves the agent to infer usage boundaries from sibling names alone.

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