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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful behavior beyond that: the no-args default returns recent changes across all files, and the restore path is described as re-saving the text with remember. It does not discuss pagination or result limits.

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?

Four short sentences, front-loaded with the resource definition, then usage triggers, then the parameter matrix, then the restore hint. No filler and no repetition of the schema.

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?

With no output schema, the description carries the burden and does so: it conveys what each call mode yields (listing vs. full version text) and the complete recovery workflow. An agent has everything needed to invoke it correctly.

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% so the baseline is 3, but the description adds meaning the schema lacks — specifically that omitting filename returns recent changes across all files and that version_id only takes effect alongside filename, producing full text rather than a listing.

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+resource ('earlier versions of the user's memory files') and defines the exact scope: text a save replaced or a forget removed. It cleanly distinguishes itself from the recall/search siblings by describing recovery of prior states rather than retrieval of current ones.

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?

Explicitly names the triggering situations ('undo a change', 'get back something that was overwritten or forgotten', 'see what a note used to say') and spells out the progressive call patterns for zero, one, and two arguments. It also routes the agent to the correct follow-up tool (remember) for restoration.

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