session_end

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

With no annotations, the description carries the full burden but only states the action ('End') and note-saving behavior. It does not disclose whether ending is reversible, if it triggers cleanup, or any side effects. Lacks the depth needed for full transparency, though it at least states the core operation.

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 a single, focused sentence that front-loads the action and avoids unnecessary words. Every word earns its place, making it highly concise and well-structured.

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 tool with two optional parameters and no output schema, the description adequately conveys the tool's purpose. Minor ambiguity remains about session lifecycle (e.g., can it be resumed?), but overall it is complete enough for an agent to select and invoke correctly.

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 100%, so the baseline is 3. The description adds no extra semantic value beyond what the schema already provides for 'notes' and 'session_id'; it merely mirrors the schema's intent without clarifying details like optionality or format.

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 uses a specific verb ('End') and resource ('session'), with clear scope ('current or specified'), which precisely conveys the tool's action. It distinguishes itself from sibling tools like session_delete and session_start by indicating a finishing operation rather than creation or removal.

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 provides clear context: use this to end a session (current or specified) and save notes. It does not explicitly exclude alternatives or mention when not to use it, but the context is sufficient for most scenarios given the tool's simplicity.

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