create_comments_by_id_replies

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

The description adds a valuable workflow instruction: 'Read the matching GET or the /schema endpoint first to see the fields this resource expects.' This goes beyond the annotations, which already indicate non-read-only, non-destructive, idempotent, and open-world behavior. The description complements these with practical guidance on body construction, but does not cover auth or error handling.

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 remarkably concise—two sentences plus the HTTP path. It front-loads the purpose and essential guidance without redundancy. Every sentence earns its place, and the body-preparation hint is included efficiently.

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 the tool's simplicity, the description, along with the annotations and an output schema, provides sufficient guidance. It covers the action, path, and the key hint for body construction. It omits specific error handling or authentication details, but these are likely covered generically. The description is adequate for an agent to invoke the tool 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 schema has no descriptions and body is freeform, so the description must compensate. It explains id as 'id/slug of the resource' and directs the agent to consult GET/schema for body fields, which is crucial for correct invocation. However, it could be more explicit about what the id refers to (comment id) and the exact expected body structure.

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 action ('Post a reply for a comment') and clearly identifies the resource (a comment). It explicitly distinguishes this from reading replies (get_comments_by_id_replies) and creating a new comment (create_comments) by using 'reply' and the path. The name reinforces this.

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 description implies usage when replying to a comment but does not explicitly contrast this tool with alternatives or provide conditions for use. There is no guidance on when not to use it or mention of prerequisites. It relies on the path and name to signal intent, which is adequate but not explicit.

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