add_reaction_to_message_api_v1_channels

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

With no annotations and a one-line description, the tool offers no behavioral details. It does not disclose whether adding a duplicate reaction is idempotent, whether it requires authentication, or any side effects. The description carries the full burden, which it fails to meet.

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 extremely short (five words), which could be considered concise, but it omits essential details. It is under-specification rather than efficient communication. A good description is front-loaded, but this one lacks substance.

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 three required parameters, no annotations, and no parameter descriptions, the tool description is woefully incomplete. It does not mention the output schema (which exists) or any usage constraints. For a tool requiring three inputs, this is insufficient for an agent to use it 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?

The input schema has three required parameters (id, message_id, name) with no descriptions (0% schema coverage). The tool description does not explain any of them. For instance, 'id' likely refers to the channel ID, 'name' to the reaction emoji, but this is left to inference. The description adds no value beyond the schema.

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 'Add Reaction To Message' clearly identifies the action (add) and resource (reaction to message), but it is somewhat tautological and fails to distinguish from siblings like 'remove_reaction_by_id_and_user_id_and_name_api_v1_channels' or 'post_new_message_api_v1_channels'. It could specify it's for a channel context, though the tool name implies that.

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?

No guidance is provided about when to use this tool versus alternatives. For example, there is no mention of prerequisites (e.g., user must be a channel member, required permissions) or when to use 'remove_reaction...' instead. The description is silent on usage context.

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