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

The description adds substantial behavioral context beyond the annotations: it reveals that watching is the paid part of the product, that a no-plan account still succeeds and receives a checkout link, that the checkout link should not be described as an error, and that the tool never charges by itself. This is exactly the kind of side-effect transparency an agent needs.

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 description is compact and front-loaded, with every sentence earning its place. It covers what the tool does, when to use it, prerequisites, and billing behavior without padding or redundancy.

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?

Given the tool's low complexity, one optional parameter, and no output schema, the description is complete: it explains the monitoring action, usage triggers, required prior steps, and the important billing edge case. An agent has sufficient information to call it correctly.

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 only parameter, matter_id, is fully described in the input schema, including when to omit it. Since schema description coverage is 100%, the description does not need to add parameter detail; the baseline of 3 applies.

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 states a clear, specific action: 'Begin continuous monitoring of a saved case, so that the user is alerted when anything new is filed.' This clearly identifies the verb, resource, and outcome, but it does not explicitly differentiate from sibling tools like get_case_updates or stop_watch beyond the general monitoring language.

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 description gives explicit use guidance: 'Use when the user asks to monitor, watch, track or follow a case, or to be told about future activity in it.' It also correctly notes the prerequisite sequence 'find_federal_case then create_case_passport.' However, it does not mention when not to use it or name alternative tools for comparison.

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