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

Annotations already establish readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real value beyond that: ordering (oldest first), the split between 'receipts' for any file and 'versions' for markdown with YAML headers, and what each entry contains (size, SHA-256, who, when).

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?

Front-loaded with the resource, then the two output sections, then the purpose. Every clause earns its place and there is no filler despite the detail.

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 of explaining return values and does so well through the receipts/versions split. Minor gaps remain around pagination or limits for very long histories, but nothing an agent needs to call it correctly is missing.

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 schema already documents path, api_token and workspace_id fully. The description adds no syntax, format, or constraint detail beyond implying a single file target. Baseline 3 is appropriate when the schema does the heavy lifting.

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 resource and scope ('the history of one file, oldest first') and distinguishes itself from read_file and list_files by detailing its two-part payload. An agent immediately understands this returns save history, not current content.

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?

Gives use-case framing ('Shows how a requirement evolved, and proves what a deliverable was at each save'), which implies when to reach for it, but never names alternatives such as read_file or changes, nor any when-not condition. Usage is implied rather than explicit.

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