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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=true, so the safety profile is structured. The description's 'WRITE' prefix and the no-op-on-already-locked note add useful semantic reinforcement of idempotency (safe retry), but it never addresses the destructiveHint implication of locking someone out, nor what happens if the device is offline.

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?

Three short sentences, front-loaded with an operation-type marker, then the effect, then the idempotency caveat. The endpoint path is arguably redundant but harmless and small.

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 one-parameter, no-output-schema tool whose annotations already cover safety and idempotency, this covers the essentials. The remaining gap is failure behavior (offline lock, permission errors), which the agent would need when invoking it in practice.

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?

With a single parameter at 100% schema description coverage, the schema already explains that device_id is a RemoteLock UUID. The description adds no format, source, or constraint detail beyond that, so the baseline of 3 applies.

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 gives a specific verb and resource ('sends the lock command to a lock') and clarifies the real-world effect ('it locks the door'). It implicitly contrasts with the sibling unlock_device through the verb choice, though it never names that sibling explicitly.

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?

Usage is only implied: an agent infers you call this when you want a door locked. There is no explicit statement of when to use this over remotelock_unlock_device or remotelock_grant_access, and no prerequisites such as device reachability.

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