Undo

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

No annotations are supplied, so the description carries the full burden for a state-mutating operation. It says nothing about whether a single call reverts one step or several, whether the undo can itself be reverted, or whether the change is destructive to the score — a critical omission for a tool that mutates the document.

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?

A single short sentence, front-loaded with the verb, with no filler. Its brevity borders on under-specification rather than verbosity, but it is structurally clean.

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?

Although the tool is trivially simple (no parameters, no nested objects), the absence of annotations and an output schema means the description is the only source of behavioral information, and it omits undo depth, empty-stack behavior, and reversibility. For a document-mutating action with no structured safety hints, that leaves meaningful gaps.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline applies. The empty schema already communicates that no options such as a step count exist, which the description correctly does not contradict.

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 ('Undo') and the scope ('the last action'), which is unambiguous and matches the title. It does not need sibling differentiation because no sibling in the catalog offers an undo/redo alternative, but it also adds nothing beyond restating the name at a slightly more specific level.

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?

There is no guidance on when to call it versus other recovery routes, how many levels of history are available, or what happens if the undo stack is empty. The agent must infer all preconditions on its own.

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