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

Adds substantial context beyond the annotations: an explicit credit cost (2 credits), a hard statement that no write to Reddit occurs, and the fact that the agent/user must complete the posting manually at source_url. This complements the provided non-destructive/non-open-world hints with cost and side-effect scope the annotations cannot convey.

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?

Three short sentences, front-loaded with the core action and scope, then cost, then the critical limitation and manual step. No filler or redundancy.

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 single-parameter tool with no output schema, it covers the essentials: what is produced (a draft), what it costs, and what it does not do. A brief note on what the response returns (e.g., the draft text and source_url) would close the remaining gap.

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 coverage is 0%, so the description must compensate; it does so only partially, clarifying that the id refers to a single mention drawn from list_reddit_mentions (implying one id, not a list). It never states the parameter's type, format, or where to source the integer beyond naming the originating tool.

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?

Specific verb+resource+scope: "Create a Reddit reply DRAFT only for one mention." It also anchors to the sibling source tool (list_reddit_mentions) and explicitly negates the scope an agent might wrongly infer ("Never posts to Reddit"), making it distinguishable from any publish or list tool.

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 names the prerequisite path (a mention obtained from list_reddit_mentions) and the required follow-up ("Copy the draft and paste it yourself at source_url"), which is clear context for when to use it. It stops short of explicit exclusions such as what to do if you want a post rather than a draft, since no such sibling exists.

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