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

Beyond the readOnly/idempotent annotations, it discloses consequential behavior: these tools never send anything to X, no send/DM/reply tool exists, the agent must use the customer's own X access, and Postkey only publishes scheduled posts and one keyword-triggered reply or DM, never liking, following, reposting, or reading timelines. It also carries authorization context (missing X access requires reconnecting) that the annotations cannot express.

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?

The purpose is front-loaded, but the opening sentence is a long run-on enumerating eight return fields that the output schema likely already covers. The closing sentences about Postkey's own scheduled publishing and comment automations are useful guardrails against hunting for a send tool, yet they describe the toolkit broadly rather than this status call, so the text is longer than it needs to be.

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 zero-parameter, read-only status tool with an output schema, the description goes beyond what is required by explaining the ready.ok failure mode, the meaning of wait/deny answers, and the boundary of what the X toolkit can do. An agent has everything needed to call it and interpret a negative result.

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 disambiguate and the baseline of 4 applies. The description's field list describes outputs, not inputs, which is appropriate here.

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?

The description opens with a specific verb and resource ('Says whether X is ready for this profile ... and where this profile stands') and then enumerates exactly what the status call returns: limit usage for the rolling hour and 24 hours, pause state, STOP count, time zone and quiet hours, saved reply counts, last 10 actions, and the toolkit's capability list. It explicitly distinguishes itself from the sibling postkey_x_check_before_send, which checks a single action.

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 states when to call it ('Use it to see whether X is set up and why answers are wait or deny') and names the alternative for the per-action case ('a single action is checked with postkey_x_check_before_send'). It also gives a fallback path when the check tool is absent: the connection was not given X access and the person can reconnect and tick the X option.

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