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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds one genuinely useful behavioral trait, that all the aggregates come from a single snapshot (i.e. one consolidated call, consistent numbers), but says nothing about cost, latency, auth requirements, or the range default's effect.

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?

A single front-loaded sentence with no filler; the four metric categories and three 'top' breakdowns are enumerated compactly. Slightly dense as a run-on list, but every clause earns its place.

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?

An output schema exists, so return values need not be explained, and annotations cover the safety profile. However, for a tool with three required parameters (including the unusual reason and user_intent metaparameters) sitting among ~35 siblings, the absence of any routing or usage context leaves a real gap.

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 75%: namespace_id, reason and user_intent are documented in the schema, while the range enum ('24h'...'all', default '30d') has no description. The description adds no meaning beyond the schema for any parameter, which is the expected baseline when the schema does the heavy lifting.

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 gives a specific verb (return) and resource (namespace-wide activity/cost/quality with top user, agent and intent summaries), so the agent knows exactly what it produces. The scope word 'namespace-wide' separates it from workspace- or MCP-level siblings such as get_mcp_overview, though no sibling is named explicitly.

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?

There is no statement of when to use this tool versus the many sibling overview/metric tools (get_mcp_overview, get_workspace, aggregate_sessions, get_metric_definition). The phrase 'from one snapshot' hints at consolidation but stops short of any explicit when-to-use or when-not-to-use guidance.

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