x_bookmarks

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

Annotations already declare readOnly, openWorld, idempotent, and non-destructive behavior, so the description only needs to add context, which it does by scoping to the signed-in account and 'currently visible' bookmarks and stating the local-snapshot destination. It does not contradict the annotations, but it adds no details about scrolling, overwrite behavior, or 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?

A single focused sentence that front-loads the action and scope with no filler. Every word 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 tool with no output schema and two undocumented parameters, the description omits parameter semantics and does not clarify what the snapshot contains or how maxScrolls affects retrieval. The rich annotations cover safety, but the operational details are too thin for confident invocation beyond defaults.

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%, and the description does not explain limit or maxScrolls. While 'currently visible' hints at scrolling through the bookmark list, the agent gets no explicit meaning for these parameters beyond their names and defaults.

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 names a specific verb ('Read'), a specific resource ('the signed-in account's currently visible bookmarks'), and a clear target ('a local snapshot'). This distinguishes it from snapshot-reading siblings like x_snapshot_read, which operate on existing snapshots rather than populating them from bookmarks.

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 given about when to use this tool instead of alternatives, and no exclusions or prerequisites are stated. The intended context (e.g., before x_snapshot_compare or x_export) is only implicit from the sibling list.

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