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

No annotations are present, so the description carries the burden. It transparently discloses the output format (text accessibility tree), the target resource (desktop grid browser page by pageId), and the intended use. It does not explicitly state that it is read-only, but 'snapshot' and 'accessibility tree' strongly imply an observational read.

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?

The description is two sentences with no wasted words. The core behavior is front-loaded, and the exclusion/alternative is cleanly separated in the second sentence.

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 one-string-parameter read tool with no output schema, the description covers what the tool returns, how it is keyed, what it is useful for, and which sibling covers other devices. Nothing essential appears missing for an agent to invoke it correctly.

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%: pageId is already described as 'Page ID from web_navigate'. The description only reinforces that the tool operates by pageId and adds no new parameter meaning, so it stays at the high-coverage baseline of 3.

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 output and scope: the accessibility tree of the DESKTOP grid browser page as text, for finding elements and understanding layout. It also distinguishes itself from the mobile sibling webpage_snapshot, making the tool's identity unambiguous.

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 explicitly says when to use it (desktop grid browser page by pageId) and when not to use it (not a device), naming the alternative webpage_snapshot for phone/tablet. An agent receives concrete routing guidance without needing to open other tool definitions.

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