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

Annotations only supply readOnlyHint=false, so the description carries real weight and does: it discloses a public-log write, non-blocking semantics, and an explicit WRITES warning that the call 'is not safe to repeat blindly' (non-idempotent). It stops short of saying what happens on a repeat call (duplicate row vs error), which keeps it from 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?

Purpose and the WRITES warning are front-loaded and the WRITES line earns its place, but the middle sentences are literary filler ('checkable instead of indistinguishable from never having looked') that add length without operational information.

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 2-param write tool with no output schema and minimal annotations, the description covers effect and idempotency reasonably well. It is incomplete on the two parameters, notably the undocumented 'secret', which an agent needs to know whether to send.

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 50%: 'secret' is undocumented in both schema and description, and 'reason' is only described in the schema. The description adds no parameter-level meaning (e.g., what the secret is for, whether it is required) despite the coverage gap.

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?

Opens with a concrete verb+resource: 'Record that you considered binding a key and declined it.' That tells an agent precisely what state gets written and distinguishes it from a bind. The remaining metaphorical framing ('the door calls declining a real position') obscures rather than sharpens the purpose.

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 implies the trigger (you considered binding a key and declined) and notes that declining is revocable ('bind later whenever you like'), which is a partial when-to-use signal. But no alternative is named and there is no explicit when-not guidance relative to bind_domain, register, or revoke_key.

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