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

Annotations already mark the tool as readOnlyHint=false and destructiveHint=true. The description adds the valuable behavioral fact that the operation is reversible by passing hide: false, which clarifies that hiding is not permanent deletion. It does not cover permissions or other side effects, but the reversibility is the key behavioral disclosure.

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?

A single sentence states the action, the reverse behavior, and the source of both ids with no filler. Every clause earns its place and the most important behavior is front-loaded.

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 reversible state-change tool, the description together with the schema covers the required identifiers, the toggle semantics, and the object relation. It does not mention delete_post as the permanent-deletion alternative, but that is a minor omission given the clarity of the hide/show behavior and no output schema requirement.

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 parameters in detail. The description mostly restates what the schema says ('reply id comes from list_replies', hide toggles visibility). It adds a modest relational note that postId is the publish the reply belongs to, but provides no significant extra meaning 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 clearly states the operation ('Hide a reply on the channel') and the reverse operation ('show it again with hide: false'). It names the resource, the toggle behavior, and the two required identifiers, making the purpose unmistakable and distinguishable from siblings like delete_post.

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 explicit guidance is given about when to use hide_reply versus alternatives such as delete_post or reply. It provides prerequisites (replyId from list_replies, postId as the owning publish), but does not explain when this tool is preferred or when a different tool should be used.

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