Snapshot

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

With no annotations, the description carries the full burden, and it does usefully disclose the returned artifact and the @eN handle syntax that other tools consume. It says nothing about the read-only nature of the call, page-loading prerequisites, or whether very large pages produce truncated output.

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, no filler, with the core purpose front-loaded and the handle-interop fact second. 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 zero-parameter tool with no output schema, the description covers the essential facts an agent needs: what is produced and how the @eN handles feed the other tools. Only minor gaps remain around preconditions and output size behavior.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. Schema coverage is 100% and no enum or nested structure exists.

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 specific verb (capture) and a precise resource (accessibility-tree snapshot of the current page), which is distinct from sibling browser_screenshot and the network tools. It does not explicitly name an alternative, but 'AX snapshot' is specific enough that an agent will not confuse it with the other capture/interaction 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?

Usage is only implied: the note that returned @eN handles can be used as selectors by other tools suggests this is the precursor step before click/fill/type, but the description never states when to call it, whether a page must already be loaded, or when to prefer browser_screenshot.

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