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

Beyond annotations (openWorldHint=true, readOnlyHint=false), it discloses that the reply is publicly attributed to the user, visible to anyone who can see the trip, gated by a per-call confirmation default, and requires a Cotlet API key with app access. That is substantial behavioral context for a mutation tool.

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?

Purpose is front-loaded and the sentences are short, but there is mild redundancy between 'Reply to a follower comment... Adds a reply under a comment on your step' and between the two confirmation statements.

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 mutation tool with no output schema and full schema coverage, the description supplies the missing behavioral essentials: visibility, attribution, confirmation flow, and auth requirement. Only minor gaps remain, such as error or rate-limit behavior.

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 all three parameters (body, step_id, comment_id) are already documented with their origins. The description adds the concept that the body becomes an attributed reply but no syntax or format detail beyond the schema, so the baseline 3 applies.

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: 'Reply to a follower comment on one of your steps.' It also clarifies the actor ('as you') and effect ('Adds a reply under a comment on your step'), which distinguishes it from the sibling list_step_comments without opening schemas.

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?

It gives clear operating context: confirmation is on by default and can be disabled, and the user must be prompted before each call because the reply reaches other people. It does not explicitly name an alternative tool, but the prerequisites for obtaining the identifiers come from the schema.

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