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

Annotations supply only destructiveHint=true, so the description contributes some value by naming the restore semantics ('so it matches again'). However it says nothing about idempotency, permissions, or what happens if the item was not archived; the raw endpoint string is developer detail rather than agent-relevant behavior.

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?

Two short sentences with the action and scope front-loaded and no filler. The trailing endpoint reference is marginally useful but not essential for an agent, keeping it just short of a 5.

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 simple two-required-parameter mutation with no output schema, the description covers the action and target adequately. It would be complete with one line on idempotency or the archived-state precondition.

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 coverage is 100% and both parameters already carry descriptions ('The item to restore.', 'The list holding the item.'), so the schema does the heavy lifting. The description adds no syntax, format, or ID-shape guidance beyond the path template.

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 ('Restore') and resource ('a previously archived list entry'), and the phrase 'previously archived' implicitly contrasts it with castle_archive_list_item. Minor terminology drift between 'list item' (name/title) and 'list entry' (description) keeps it from a 5.

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 implicit precondition ('previously archived') hints at when this applies, but the description never states when to choose it over siblings like castle_update_list_item or castle_archive_list_item, nor any exclusions. Usage is only implied.

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