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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds one genuinely useful behavior: it does not open or follow the link. It does not disclose the blocking/waiting semantics implied by the tool name, such as whether it polls until the link arrives or returns empty on timeout.

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, front-loaded with the action and resource, followed by the single most decision-relevant caveat. No filler or restated title text.

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 correctly tells the agent the return artifact is a link, and the timeout parameter supplies the waiting context. The remaining gap is modest: it doesn't state what happens when no link arrives within the wait window, but that is partially implied by the timeout parameter and its bounds.

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 the schema already explains token, address, and the 5-45s timeout with its default. The description only reinforces that the token authorizes access to the inbox ('owned with the supplied token'), which is a marginal addition over the schema.

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 names a specific verb and resource: read a verification/sign-in link from a temporary inbox tied to a token. That distinguishes it from gecici_wait_for_otp by artifact type (link vs. one-time code), though it never names that sibling explicitly.

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?

Usage is only implied: an agent can infer this is for magic-link flows rather than OTP flows, and 'Does not open the link' rules out one tempting follow-up. There is no explicit when-to-use statement, no guidance on choosing between this and gecici_wait_for_otp, and no mention of what to do on timeout.

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