undo

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action but does not disclose side effects (e.g., whether it permanently modifies the session, what happens if there is nothing to undo, or if it affects the undo history). For a mutating tool, this lack of transparency is a significant gap.

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?

The description is a single sentence with no redundancy. It is front-loaded with the verb 'Undo' and clearly states the resource. Every word earns its place.

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 tool with no parameters and no output schema, the description is adequate but minimal. It lacks essential context about behavioral implications (e.g., mutation, error states, prerequisites) which would be important for an agent invoking this action, though the simplicity of the tool lowers the requirement somewhat.

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 has zero parameters, so schema coverage is trivially 100%. The description does not add parameter semantics, but none are needed. Given the 0-parameter baseline of 4, the description meets expectations.

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 uses the specific verb 'Undo' with the resource 'the last operation in Ableton', clearly stating the tool's function. It also distinguishes from the sibling tool 'redo' by explicitly saying 'undo' which is the inverse operation.

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 when you want to revert the last action in Ableton. However, it does not explicitly mention alternatives or when not to use it, such as limitations (e.g., cannot undo beyond a certain point) or comparison to adjacent tools like 'redo' or 'capture_midi'.

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