analytics_summary_by_period

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

Annotations already declare readOnlyHint and openWorldHint. The description adds 'persisted/live' context, but does not elaborate on other behavioral traits like response format or potential staleness. Adequate but not rich.

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 concise with structured sections (Before calling, When to use, Trigger words). However, it could be slightly more organized, e.g., bullet points. Still efficient.

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?

The tool has no output schema and only one parameter with no schema description. The description does not explain what the summary includes (e.g., total spend, breakdowns), leaving the agent uncertain about the output. Incomplete for effective use.

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 coverage is 0%, so the description must compensate. It mentions trigger words like 'april 2026' but does not specify the exact string format expected for the 'period' parameter. This leaves ambiguity.

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 'Get a persisted/live statement period summary', with a specific verb and resource. However, it does not fully differentiate from sibling tools like analytics_period_overview or analytics_summaries_range, though the trigger words help.

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?

Explicit guidance is provided: 'Before calling: Call analytics_periods_list first to confirm requested periods exist.' Also includes when to use and trigger words, making the tool's usage very clear.

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