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

Annotations already flag destructiveHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile is covered structurally. The description adds real behavioral context the annotations don't: the effect persists 'from now on' and lands in the baseline's ignored regions, plus a documented undo path. It stops short of saying exactly what suppressing the region does to future alerts, so it isn't quite a 5.

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 the action and its persistence, followed by undo and alternative. Every clause carries information; no restating of the title or name.

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 single-parameter mutation with no output schema, the description covers the effect, persistence, reversibility, and the preferred alternative. An agent has everything needed to decide whether to call it and what happens afterward.

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?

There is a single parameter (comparisonId) and schema coverage is 100%, with the schema already telling the agent where to source the id. The description adds no parameter-level detail, so the baseline 3 for a fully documented schema is appropriate.

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 ('ignore the area that changed on this comparison') and names the resulting state change ('added to the baseline's ignored regions'). This cleanly separates it from accept_visual_change and flag_visual_change_as_problem without the agent needing to open any schema.

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?

Gives the undo path ('Undo with undo_visual_review') and routes the agent toward a better alternative when one exists ('A mask (update_visual_monitor) is often the better fix'). Both the when-to-use and the escape hatch are explicit.

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