document.redo

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

No annotations are supplied, so the description carries the full burden. It correctly discloses the key behavioral trait that only the most recent undone command is re-applied (not arbitrary history), but says nothing about what happens when the undo stack is empty, whether redo can be repeated, or whether history is per-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 front-loaded sentence with no filler; every word contributes to identifying the operation. Nothing is buried or repeated.

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 zero-parameter, no-output-schema tool the core action is covered, but the practically important edge case (calling it with nothing in the undo stack, and how to guard with document.can_undo) is absent. That is the one piece of information an agent actually needs beyond the name.

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 clarify; the baseline for a parameterless tool applies. The schema is trivially complete.

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 ('Redo') and a precise target ('the most recently undone command'), which is more specific than the bare name and clearly distinguishes it from the general-purpose mutation tools in the sibling list. It does not explicitly contrast itself with document.undo, relying on the well-known undo/redo pairing instead.

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: the agent must infer that this follows a document.undo call. There is no explicit 'use after undo' instruction and no mention of document.can_undo as the way to check whether a redo is possible, even though that sibling exists right next to it.

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