new_page

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

The only annotation is readOnlyHint=false, so the description carries most of the disclosure burden and does confirm the default-to-project-URL behavior. It does not, however, mention that focus moves to the foreground by default, how the new page relates to existing tabs, or what the caller receives back (e.g. a page identifier needed for follow-up calls).

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 sentences with no filler and the core action front-loaded. The second sentence is slightly ambiguous, but there is no wasted text.

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 4-parameter page-creation tool with no output schema, the description is minimal: it omits how the newly created page is identified or referenced in subsequent calls, and doesn't hint at the interaction with background/isolatedContext behavior documented only in the schema.

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% (timeout, background, isolatedContext all documented in-schema), so the schema already does the heavy lifting. The description adds only the default-URL rule for the required url parameter and nothing about the other three parameters.

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 concrete verb (open) plus resource (a new tab/page) and the action taken (load a URL), so an agent can distinguish it from navigate_page or select_page at a glance. It is clear, though it never names the siblings it is distinct from.

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 only usage cue is 'Use project URL if not specified otherwise,' which is an implicit default rather than a when-to-use rule. Nothing says when to open a new page versus navigating an existing one (navigate_page) or selecting among open pages (select_page).

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