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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and non-destructive, so safety is covered. The description adds genuine behavioral context by naming the three fixed reporting windows and the exact contents of the report — valuable given there is no output schema. It stops short of saying whether figures are aggregates vs. per-period breakdowns.

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?

One sentence, front-loaded with the purpose, then a compact colon-delimited list of outputs. Nothing is padded and no clause needs to be re-read.

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 read-only, closed-world, two-parameter report tool with full schema coverage and no output schema, the definition covers purpose, windows and the metric set. The remaining gap is the shape of the response — whether metrics are single totals or broken down per period/channel — which an agent must discover at call time.

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 100%: both params are described, the days enum with its default is spelled out, and agent_id points at list_agents. The description's mention of '7, 30 or 90 days' merely echoes the enum, adding no format or fallback semantics, so the 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?

States a specific verb ('Summarize') plus resource ('how an agent performed') and then enumerates the exact metrics returned: conversations by channel, leads, bookings, handoffs, top questions, unanswered count. That enumeration effectively separates it from sibling list tools like list_leads or list_unanswered_questions, which return raw rows rather than an aggregate report.

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 implies the usage context (periodic performance review over 7/30/90 days) but never says when to pick this over get_agent or the list_* siblings, nor any exclusions or prerequisites beyond the schema's reference to list_agents for the ID. Usage is inferable but not guidance.

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