Get Monthly Active Users

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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, covering safety profile. Description adds default month/timezone behavior and clarifies date interpretation, but does not describe return format or edge cases like invalid dates. This adds some value but not rich behavioral context.

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?

Single sentence, front-loaded with verb and resource, includes key default behavior. No wasted words.

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 simple read-only metric tool with good annotations and one optional documented parameter, the description covers purpose, default, and output (count). It lacks explicit return type but 'count' is sufficient. Could mention alternatives but not required.

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 covers 100% of the single parameter with the same default and format info. Description does not add information beyond the schema, so baseline 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?

Description uses specific verb 'Get' with resource 'monthly active user count' and scope 'month containing a given date' with UTC default. Clearly distinguishes from sibling tools like lyzr_get_dau and lyzr_get_mau_trend by specifying MAU count rather than DAU or trend.

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?

Provides clear context on when to use: to get MAU for a month, defaulting to current month UTC. Does not explicitly name alternatives or exclusions, but the intended usage is unambiguous given the description.

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