elster_session_cancel

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

With no annotations, the description carries the full burden. It discloses the main effects (closes browser, marks cancelled) but omits important details like irreversibility, required permissions, or potential side effects. The transparency is adequate for a simple operation but could be more explicit.

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 extremely concise and front-loaded, delivering the core action in a single sentence. Every word adds value, with no filler. It earns a 4 for efficiency, though a bit more context would not harm conciseness.

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?

Given the complexity (simple), lack of output schema, and absent annotations, the description covers only the basic action. It does not address when to cancel, whether the session must be active, or what happens to other operations. The completeness is minimal for an agent to use it confidently.

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?

The schema has 0% description coverage, and the description adds no meaning to the 'sessionId' parameter beyond what the name implies. The parameter's purpose is obvious from context, but the tool description should clarify its role (e.g., which session, as the identifier).

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 the action ('cancels') and the resource ('running session'), and adds specific behavioral details like closing the browser and marking status as CANCELLED. However, it does not explicitly distinguish from sibling session management tools, though the difference is implied.

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?

No guidance is provided on when to use this tool versus related tools like elster_session_list or elster_session_status. The description lacks context for prerequisites, such as requiring an active session, or when cancellation is appropriate.

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