system_packages_updates

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

With no annotations, the description carries the full burden of disclosing behavior. It implies a read-only listing but does not explicitly state that no changes are made, nor does it mention whether the check is live/cached, requires authentication, or has side effects such as refreshing package metadata.

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 short sentence with no redundant words, making it easy to parse. It is appropriately concise for a zero-parameter tool, though it could be slightly more informative without much added length.

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 zero-parameter tool with an output schema, the description is mostly sufficient: it indicates the result is a list of available OS package upgrades. However, in the context of many sibling update-related tools, it does not clarify when to choose this tool over update_test/run/history or what the output contains beyond 'available upgrades'.

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 tool has zero parameters and the schema coverage is 100%, so there are no parameter semantics to document. The description adds useful context by clarifying the tool reports available upgrades rather than performing them.

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 phrase 'Available OS package upgrades' indicates the tool retrieves the list of upgrades available for the operating system packages. It is distinguishable from siblings like system_packages_update_run and system_packages_update_test because it points to a listing rather than an action, though it lacks an explicit verb such as 'list' or 'check'.

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 call this tool versus system_packages_update_test, system_packages_update_run, or system_packages_history. The description only states what is available, leaving the agent to infer the appropriate context from the tool name and sibling list.

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