reply_message_via_channel_name_or_id

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

No annotations are provided, so the description carries the full behavioral burden. It adds only that names are resolved natively and that messageId is the parent message; it does not disclose permissions, side effects, rate limits, ambiguity handling, or return behavior for this write operation.

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, front-loaded with the action and key identifier. There is no redundant or wasted text.

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 schema fully specifies the required and optional parameters, and no output schema is needed here. However, given the lack of annotations and the fact that this is a write tool, the description is minimal on behavioral context such as permissions, failure modes, or threading effects.

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 four parameters in detail. The description adds minor meaning by calling messageId the parent message and noting native name resolution for channel identifiers, but it does not meaningfully supplement the schema's parameter guidance.

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 states a specific verb and resource: replying to a message in a channel or DM thread using parent messageId. It clearly separates thread replies from ordinary message sending, though it does not explicitly name sibling alternatives such as send_message or list_thread_replies.

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 phrase 'Reply to a message ... using parent messageId' implies the appropriate usage context, but there is no explicit guidance on when to use this tool versus send_message, list_thread_replies, or edit_message. Usage is inferable rather than spelled out.

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