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

With no annotations provided, the description carries the full burden. It discloses the side effect of finalizing traces/artifacts, but fails to state the destructive nature of the operation (session is terminated), idempotency, or what happens to associated tabs/downloads.

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?

Single sentence with zero waste. Every word earns its place: 'Close' defines the action, 'session' identifies the target, and 'finalize its trace/artifacts' adds essential behavioral scope without verbosity.

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 single-parameter destructive operation with no output schema, the description covers the core action but is incomplete. It misses destructive warnings, parameter documentation, and the relationship to trace data (saved vs discarded).

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 has 0% description coverage. The description mentions 'session' which weakly maps to the 'session_id' parameter, but provides no format details, source information (e.g., from create_session), or semantic explanation of what constitutes a valid session ID.

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 specific verbs ('Close', 'finalize') and resources ('session', 'trace/artifacts'). It effectively distinguishes from sibling tools like 'close_tab' (targets tabs) and 'stop_trace' (implies this handles finalization during close).

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 provided on when to use this versus alternatives like 'stop_trace' or 'fork_session', nor when not to use it (e.g., if session needs to persist). Lacks prerequisites like 'session must be active'.

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