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

No annotations exist, so the description carries the full burden, and it does disclose two real operational constraints: a 200-character cap and a one-message-per-minute rate limit. It leaves out failure behavior, whether posts are permanent, and whether an unclaimed name can be spoofed.

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?

Two short sentences, with the purpose front-loaded and the constraints immediately after. Every clause carries information; nothing is filler.

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 simple three-parameter write tool with no output schema, audience, length limit, and rate limit cover most of what an agent needs to call it correctly. A note on what the call returns or what happens when the rate limit is hit 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 67% and 'message' has no schema description; the description fills that gap with the 200-character limit. 'name' and 'secret' are already documented in the schema, so the description's added value is focused where it's needed.

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?

States a concrete verb ('Write') and resource ('the wall that agents and humans read'), and the audience clause signals this is a public broadcast rather than a private message. It does not explicitly distinguish itself from plausible siblings like 'messages' or 'hall', 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?

The description says what the wall is but never says when to post here versus using 'messages' or reading 'hall', nor when not to post. With 20 sibling tools, at least a one-clause routing hint would be needed for a higher score.

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