get_subscription_breakdown

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

With no annotations, the description carries the full burden. It discloses the tool's behavior by specifying it 'Always returns metrics grouped by subscription tier' with detailed breakdowns, but lacks information on permissions, rate limits, error handling, or data freshness. It adequately describes the output structure but misses operational constraints.

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 front-loaded with the core purpose in the first sentence, followed by essential output details. Every sentence adds value without redundancy, making it efficient and well-structured for quick understanding.

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 moderate complexity (2 parameters, no output schema, no annotations), the description is mostly complete. It clearly states the purpose, output structure, and time-based operation. However, it lacks details on error cases or example usage, which could enhance completeness for a reporting tool.

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 fully documents the two parameters (startDate, endDate) with formats and defaults. The description adds no additional parameter semantics beyond implying a time period, which is already covered by the schema. Baseline 3 is appropriate as the schema handles parameter documentation.

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 clearly states the specific action ('Compare subscription tiers') and resource ('Enterprise, Premium, FVC, BVC, Plus') with detailed scope ('across a time period'). It distinguishes from siblings by focusing on subscription-tier comparison rather than entities, fields, platform breakdowns, ratings, usage summaries, visit trends, or top changes.

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?

No guidance is provided on when to use this tool versus alternatives like 'get_platform_breakdown' or 'get_usage_summary', nor any prerequisites or exclusions. The description implies usage for time-period comparisons but lacks explicit context for tool selection among siblings.

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