session_end

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

With no annotations, the description carries full burden and discloses side effects (writes to sessions table and updates active_context) and states idempotency. This provides meaningful behavioral transparency about persistence and overwrite behavior.

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 three sentences with no wasted words. It front-loads the core purpose, then explains restoration, and finally lists side effects and idempotency. Every sentence serves a purpose.

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 description covers what the tool does, its relationship to session_start, side effects, and idempotency. It does not explain return values (likely none) or error conditions, but these are not essential given the tool's simplicity and no output schema.

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?

All 6 parameters have descriptions in the input schema (100% coverage). The description adds context by listing the fields as being persisted, but does not add meaning beyond what the schema already provides, so baseline 3 is appropriate.

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 it saves session state and lists specific fields (summary, work done, etc.). It distinguishes the tool's purpose from session_start by noting restoration, but does not explicitly differentiate from sibling session tools like session_history or search_sessions.

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 mentions using it 'before ending a conversation' and notes automatic restoration by session_start, providing clear usage context. However, it lacks explicit guidance on when not to use it or alternatives (e.g., session_history for viewing past sessions).

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