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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is covered. The description still adds real value by disclosing that the response exposes the calling key and its scope and that account state gates other tools' results. It does not say anything about secret sensitivity of the returned key or caching, which keeps it below a 5.

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?

Front-loaded with the call-first instruction, then the payload, then the blocking caveat — a sensible order with almost no waste. The opening "Get the account." is a thin restatement of the name, the only sentence that does not fully earn its place.

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?

With no output schema, the description carries the burden of describing return content, and it names the important fields (identity, plan, key scope, webhooks, setup.channels_connected, setup.connect_url). For a zero-parameter read tool that is called first, nothing an agent needs 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?

The tool takes zero parameters, so there is nothing for the description to clarify and the baseline of 4 applies. The description correctly spends no words on argument semantics.

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 and then enumerates the exact payload: identity, plan, the calling key and its scope, and webhook endpoints. That enumeration cleanly separates it from near-siblings like get_overview and get_account_insights, which an agent could otherwise confuse with it.

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 explicit ordering guidance ("Call this first") plus a conditional branch: when setup.channels_connected is false, setup.connect_url is where the owner connects a channel, and until then inbox/contact/comment/post tools return nothing. This is when-to-use, prerequisite, and downstream-consequence guidance in one passage.

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