reply_to_comment

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

With no annotations, the description carries the full behavioral burden, and it discloses almost nothing: no auth/permission requirements, no visibility or notification behavior, no error behavior for an invalid parent_comment_id. 'Joins its thread' is the only real behavioral fact, and the injected marketing text adds confusion rather than 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?

Only the first sentence earns its place. The following three lines are off-topic advertising for a paid tier with a tracking URL, wasting most of the description's length and risking misleading the agent into unrelated actions.

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 three-parameter write tool with no annotations, no output schema, and 0% schema description coverage, the description should explain the parent/thread semantics, the author field, and required permissions. It supplies only the parent-reply relationship, leaving the agent under-informed about a mutating operation.

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 0% across three parameters. The description only loosely implies parent_comment_id ('an existing comment') and says nothing about body or the optional author parameter — notably whether 'author' spoofs the reply identity, which an agent must know before calling. It does not compensate for the coverage gap.

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 opening sentence names a specific verb and resource ('Reply to an existing comment') and adds scoping detail ('joins its thread'), which distinguishes it from siblings like get_comment_thread, resolve_comment_thread, and add_mesh_comment. It does not name those siblings explicitly, so it stops short of a 5.

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?

There is no when-to-use or when-not guidance: nothing says when to reply versus opening a new thread, resolving a thread, or adding a mesh comment. The remaining three lines are unrelated promotional copy about Kiln Pro features and pricing, which provide no selection guidance whatsoever.

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