create_bookmark

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

Annotations already indicate this is a mutating, non-idempotent operation, and the description adds meaningful behavioral detail beyond that: url presence switches the resource type between bookmark and folder, and parent_id falls back to Chrome's default location. This gives the agent useful operational expectations without contradicting the annotations.

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 short, front-loaded sentences cover the core behavior, the main conditional, and the default behavior. Every sentence earns its place and there is no filler or repetition of schema information.

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?

The description is sufficient for the basic call paths: create a bookmark, create a folder, or choose a parent folder. The output schema covers return values, and annotations cover mutation and idempotency expectations. The only notable omission is session_id, whose purpose is not explained, so the description is not fully complete for all optional parameters.

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 0%, so the description must carry the parameter semantics. It explains url and parent_id well, including their conditional and default behavior, and title's required role is inferable from the schema. However, session_id is completely undocumented in both the schema and description, leaving a meaningful gap for a 4-parameter tool.

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 clear action and resource ('Create a bookmark or folder') and immediately clarifies the core distinction: supply a URL for a bookmark, omit it for a folder. This is specific enough to clearly distinguish it from sibling tools like get_bookmarks and remove_bookmark.

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 gives explicit conditional guidance for the main decision the agent must make: whether to include url or omit it to create a folder. It also explains parent_id's default behavior. It does not name alternative tools or explicitly say when not to use this tool, but the create-versus-read/delete contrast with siblings is clear.

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