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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds real behavioral facts -- results ordered newest first and returned as summary fields with total volume -- but says nothing about pagination behavior or the 50-item default beyond the schema.

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?

Front-loaded with the ordering and payload facts an agent needs first, then the optional filter, then the sibling pointer -- a sensible priority order. Only mild redundancy in repeating 'sessions' and the trailing parenthetical is slightly dense.

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 needn't be spelled out, and annotations cover the safety profile. What's missing is enough to call it correctly: the unexplained limit and the ambiguity of whether 'total volume' is per-session or an aggregate figure leave the agent guessing.

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 0%, so the description must carry the parameter burden and it only partly does: 'Optional date range' covers date_from/date_to but gives no format or inclusivity semantics. The `limit` parameter is never mentioned, leaving its default and any maximum undocumented.

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 and resource plus two distinguishing traits: newest-first ordering and summary fields with total volume. It implicitly separates itself from the singular get_session by saying 'List sessions', and explicitly redirects review-oriented needs to get_coaching_context.

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?

Explicitly marks the date range as optional, telling the agent it can call with no filters, and names the alternative tool plus a task value for the adjacent use case. It does not state when to prefer get_sessions over get_session or get_stats, which is the remaining guidance gap.

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