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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and the description is consistent with them by stating it 'opens nothing by itself' and only returns instructions. That is useful confirmation of a non-obvious behavior for a tool named 'reschedule'. The API key/50-reads-per-day note is background about FieldRoutes rather than about this tool's own behavior, so it adds limited transparency value here.

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 core behavior is front-loaded in the first sentence, which is good. However, the trailing sentence about FieldRoutes's official API, support-gated keys, and a 50-read/day free tier is tangential to invoking this tool and includes an oddly specific 'checked 8 Nov 2026' stamp, adding length without decision-relevant value.

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 parameters and no output schema, the description carries the burden of explaining what comes back, and it does: a step-by-step guide of screens, buttons, and fields. It also names the follow-up tool family needed to complete the task. Complete enough for an agent to call it correctly; only the missing sibling contrast keeps it from a 5.

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 the baseline is 4 and there is nothing for the description to disambiguate. No parameter claims are made that could conflict with the empty 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 ('Reschedule appointment in the user's own FieldRoutes account') and then clarifies the actual mechanic: it returns step-by-step instructions rather than performing the reschedule. That clarification is what saves it, since the name alone would imply an executed mutation. It does not explicitly contrast with fieldroutes_schedule_appointment, so it falls short of a 5.

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 the workflow clearly: call this to get the FieldRoutes screens/buttons/fields, then carry it out with the cotlet_browser_* tools in the user's Cloud Browser. That is concrete routing guidance to the sibling family. It stops short of explicit exclusions, e.g. when to use fieldroutes_schedule_appointment or the official API instead.

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