Check in

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

The annotations already disclose readOnlyHint=false and destructiveHint=false, so the agent knows this is a non-read-only but non-destructive mutation. The description adds the core check-in behavior, but it does not describe side effects such as status/location changes, quantity handling, permissions, idempotency, or failure modes.

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 front-loaded and extremely terse, with no filler. Every clause provides actionable resource-specific guidance.

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 an 8-parameter mutation with only minimal annotations and no output schema, the description covers the critical from_user_id/from_asset_id mapping for several resource types. It is not complete enough, however, because consumables are left undocumented and optional parameter behavior and mutation side effects are not addressed.

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 description adds important conditional parameter meaning beyond the schema by specifying that hardware needs just the id, accessories/licenses use from_user_id or from_asset_id for licenses, and components use from_asset_id. However, it omits the consumables resource entirely and does not explain optional fields such as note, quantity, status_id, or location_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 states a specific verb and resource: 'Check an item back in.' The phrase 'back in' implies the reverse of the sibling checkout operation, but it does not explicitly name checkout or otherwise distinguish itself from that sibling.

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 implies when to use it by saying 'back in,' but it never explicitly says this is for returning previously checked-out items or when to prefer it over checkout/update/delete. It provides per-resource invocation guidance, which is useful but is more parameter mapping than usage selection.

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