live12_undo_redo

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

With no annotations, the description carries the full burden. It does add real value by exposing the underlying Song.undo/Song.redo calls and flagging that begin_step/end_step 'demarcate transactional undo steps', which hints that intermediate operations collapse into one undo entry. It does not say what happens when there is nothing to undo/redo, whether an open transaction is auto-closed, or that undo mutates global song state.

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 naming the tool's domain first and its action surface second, with no filler. Slightly dense with three clauses joined by 'or', but nothing is wasted.

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 one-enum-parameter tool with no output schema, the description covers the domain and the action surface adequately. Minor gap: 'status' is said to query state but the description doesn't note that the result reports can_undo/can_redo, which the schema enum already covers.

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% and the enum member descriptions already define each action precisely, so the schema does the heavy lifting. The description's phrase 'demarcates transactional undo steps' adds a conceptual gloss on begin_step/end_step but no detail beyond the schema (e.g., nesting rules or required pairing).

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?

Specific verb-plus-resource: names Ableton Live 12 and the underlying Song.undo / Song.redo calls, and covers all three functional modes (execute, status, transaction demarcation). No sibling tool overlaps undo/redo, so explicit differentiation isn't needed, but the single sentence packs several modes without ranking them.

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 by the action list; there is no statement of when to prefer undo vs. redo, when to check 'status' before acting, or when to wrap several operations in begin_step/end_step. The agent must infer those decisions from the schema enum alone.

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