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

Annotations already declare non-destructive (destructiveHint=false), non-open-world mutation, and the description's 'additive' aligns with that, hinting the source session is left intact. However it does not disclose what is copied (laps, logs, setups), whether permissions beyond accessibility are needed, or any side effects.

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?

A single front-loaded sentence with no filler or repetition. It is efficient, though arguably under-specified rather than genuinely complete.

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 output schema removes any need to describe return values and annotations cover the safety profile, so the remaining gap is the unexplained 'additive' behavior and what a copied session contains. Adequate but thin for a mutation tool.

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?

Only one parameter exists and its name (sessionId) is largely self-documenting, but schema description coverage is 0% and the description never mentions the parameter or what 'accessible' means for it. It neither compensates for the coverage gap nor adds real meaning.

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+resource (create a copy of a driving session) and the word 'copy' distinguishes it from the create_session/update_session/archive_session siblings. The modifier 'additive' is unexplained, but the core action is unambiguous.

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?

There is no when-to-use vs when-not-to-use guidance and no alternative named. The only usage signal is the embedded precondition that the session must be 'accessible', which is implied rather than stated as a rule.

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