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

Annotations carry only destructiveHint=true, so the description carries most of the disclosure burden. It usefully flags that the target is a LIVE chat and that one mode is customer-visible, hinting at immediacy and irreversibility, but it does not state whether messages can be edited/retracted, what permissions are required, or any rate 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?

Three tight sentences with the core operation and mode distinction front-loaded, then parameter guidance, then the REST endpoint. 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 write tool with no output schema, the definition covers what is created, where it lands, and how the two modes differ. It leaves gaps around auth/permissions and post-creation lifecycle, but nothing essential for invoking the call correctly is missing.

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 every parameter is already documented in the schema. The description restates the type enum and the agent-omission rule almost verbatim, adding little beyond the schema. Baseline 3 is appropriate.

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 (POSTS) and resource (a message) and immediately distinguishes the two modes: customer-visible reply (type "message") vs internal private note (type "private"). The reader can separate this from read-side siblings like helpcrunch_get_chat_messages or helpcrunch_get_chat without opening a schema.

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?

Gives clear selection context for the two modes and for when to set `agent` versus omit it for customer messages. It does not name a competing sibling or a when-not-to-use condition, so it falls short of the explicit routing seen in top-tier definitions.

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