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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=true, and destructiveHint=false, so the safety and idempotency profile is covered. The description adds genuinely new context: the recoveryKey must be kept secret and reused only with the same target across retries, which aligns with idempotentHint and explains key handling. It still omits what the created access actually grants.

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 short sentences with no padding, and the security-critical recoveryKey guidance is stated plainly. The opening sentence is vague rather than informative, so brevity comes at some cost to clarity.

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 mutation that creates access with no output schema and no annotations covering what is produced, the description should explain what an "isolated access" is, prerequisites, and success/error behavior. It covers only retry semantics, leaving the core operation undefined.

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 0%, so both parameters rely on the description. It does address both: recoveryKey by name (keep secret, reuse on retries) and target implicitly ("same target"). However, it adds no format semantics such as the 64-hex-character pattern or URI constraint, leaving the compensation incomplete.

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 says "Create an isolated access," which is an obscure restatement that never names the resource (a destination/webhook endpoint) or connects to the sibling set. An agent cannot confidently tell what register_destination produces versus verify_destination or get_destination_status. The verb is present but the object is opaque.

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?

The only usage guidance is the retry hint ("reuse it only with the same target on retries"), which is narrow and operational. It never states when to register versus when to verify, revoke, or check status via the siblings, so the agent gets no routing guidance.

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