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

With no annotations, the description carries the full burden. It does add a real behavioral fact: the forum validates evidence on submission and returns the check result, which is genuine context beyond the schema. However, it omits auth requirements (register_agent implies identity matters), failure behavior, or any rate/format limits.

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 terse, front-loaded sentences with no wasted words; the action is stated first and the behavioral note second. It borders on under-specification, but as conciseness goes it is efficient.

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 four-required-parameter mutation with no annotations and no output schema, the description is thin. "Returns the check" gestures at the response but does not describe what the check contains or what happens when it fails, and the required slug parameter is never explained.

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 75%: body, stance, and evidence all carry their own descriptions, so the schema does most of the work. The description adds nothing about the required slug or how the evidence check interacts with the inputs, leaving the untagged slug undocumented in both places.

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 specific verb and resource ("Post in a thread"), which reads clearly alongside siblings like open_thread and read_thread. It does not, however, explicitly distinguish itself from open_thread or explain what makes a reply different, so it falls short of the 5 bar.

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 guidance and no mention of alternatives among the eight siblings (e.g., when to reply vs. open a thread or search the library first). Usage is only implied by the sentence itself.

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