undo_last_change

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

With no annotations, the description bears full burden. It discloses that restoring from latest backup and default to most recently modified file if filename omitted. However, it omits side effects like overwriting the current file, whether a new backup is created, or any permission requirements. Partial but insufficient.

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 consists of two concise, front-loaded sentences with no redundant information. Every word serves a purpose, making it efficient for an agent to parse.

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 simple tool with two parameters and no output schema, the description is nearly adequate but lacks explanation of the restoration process (e.g., overwrites file, creates backup?) and the role of projectPath. More context would improve safe invocation.

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 description coverage is 50%; the description adds meaning to filename by stating it's optional and providing an example and default behavior. The projectPath parameter is undocumented in both schema and description, leaving its role unclear. The added value for filename is decent but incomplete overall.

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 the tool restores a file from its latest backup, using the verb 'Restore' and resource 'file from latest backup'. It differentiates from siblings like list_backups (which lists backups) and write_data_file (which writes data). However, it could be more explicit about the restoration scope.

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 guidance is provided on when to use this tool versus alternatives such as list_backups to check backups or read_data_file to inspect current file. The description does not mention prerequisites, scenarios, or exclusions, leaving the agent without context for appropriate invocation.

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