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

Annotations already indicate readOnlyHint=false, destructiveHint=false, idempotentHint=false. The description adds useful behavioral context: it syncs to all connected Obsidian devices, and the file's content is unchanged. It doesn't mention whether the operation can overwrite an existing file at the destination, which would be valuable for a move 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?

Two sentences with no fluff. The core action is front-loaded, and the sync/behavioral note is concise. Every sentence earns its place.

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 move operation with a full output schema and 100% parameter coverage, the description is nearly complete. It could mention overwrite behavior or whether the old path must exist, but the essential information for calling the tool correctly is present.

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 100%, so the schema already documents all three parameters. The description adds the semantic point that only the path changes, not the content, which reinforces the meaning of old_path/new_path. However, it doesn't add details beyond the schema, so baseline 3 is appropriate.

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 states a specific verb ('Move or rename') and resource ('a single attachment (image, PDF, or other binary file) to a new path'), and distinguishes it from note/folder operations. It also clarifies that content is unchanged, which helps differentiate from write/update tools.

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?

The description implies when to use this tool (when moving/renaming an attachment) and the vault_id parameter description gives explicit guidance on when it is required and when to omit it. It doesn't explicitly name alternatives, but the sibling list makes the distinction clear enough.

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