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

With no annotations, the description carries the burden of behavioral disclosure. It usefully reveals a non-obvious side effect: removing the last route automatically un-arms the device so no traffic is paused. It does not cover idempotency or error behavior, but the disclosed side effect is meaningful.

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 tight sentences: the first is a clear verb+object statement, the second adds a valuable side effect without filler. Nothing extraneous is present.

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-parameter mutation, the description plus schema are largely sufficient. It includes the important automatic un-arm behavior, though it omits return value or error details; since no output schema exists, that is a minor gap.

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 description coverage is 100%, so the schema already fully documents udid and id. The description adds only minor context ('by id', 'from *_mock_list' is in the schema), matching the baseline 3 for fully covered schemas.

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 and resource: 'Remove one browser route by id.' The word 'one' distinguishes it from bulk removal (webpage_mock_clear) and the resource 'browser route' aligns with the webpage_mock_* family.

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 usage: use this to remove a single known route by id. However, it does not explicitly say when to prefer this over webpage_mock_clear or the related mock_remove tools, nor does it mention any prerequisites or exclusions.

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