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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so safety burden is partly carried. The description adds value with the persistence semantics ('from now on') and the undo path, but says nothing about what exactly gets destroyed or the scope of impact.

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?

Purpose is front-loaded in the first clause, followed by the undo hint. The parenthetical signature path is dense but earns its place by anchoring where the input comes from. Two sentences, minimal waste.

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 idempotent, destructive mutation with annotations covering the safety profile and no output schema, the description supplies the signature source and the reversal tool. Reasonably complete, though impact scope remains implicit.

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%, so signatures, runId, and pageKey are already documented. The description repeats the signatures source pointer that the schema already contains, adding no syntax or format detail beyond the structured data.

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 (Ignore) and resource (specific element changes on a page), with scope ('from now on') that separates it from one-off actions. Siblings like accept_structure_change and ignore_visual_change are distinguishable from the verb+object pairing.

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 a concrete use case ('e.g. a widget that comes and goes') and names the reversal path (undo_structure_review). It does not explicitly contrast when to prefer this over accept_structure_change, but the context is clear.

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