undo.begin

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

No annotations provided, so full burden on description. The description says 'Begin undo transaction' but doesn't explain what happens if a transaction is already open, if there's a nesting limit, or if it's idempotent. Critical behavioral gaps for a stateful operation.

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?

Extremely short at 3 words, but this is under-specification, not conciseness. It conveys basic purpose but omits critical details like return value or side effects. Could be more informative within a sentence.

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?

Given the tool is part of a larger undo system (siblings: undo.commit, undo.revert, undo.undo, undo.redo) and has no output schema, the description is insufficient. It doesn't explain what begins an undo transaction means, how it interacts with the sibling tools, or what the agent should expect after calling it.

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 has 1 parameter (session_id) with 0% coverage. The description adds no param-specific info. Baseline is 4 for 0 params, but here there is 1 parameter. The description says nothing about session_id's role, format, or constraints. With low coverage (0%), description should compensate but doesn't.

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 clearly states it begins an undo transaction. However, the term 'transaction' is ambiguous—it's unclear if this is database-like or sequence-based. Among siblings like undo.commit, undo.revert, undo.undo, undo.redo, the purpose is distinct but could be sharper.

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?

No explicit guidance on when to use this tool vs alternatives. The description implies it must precede undo.undo or undo.revert but doesn't state this. Siblings suggest an undo grouping pattern, yet no context on when to begin vs not.

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