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

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds useful scope context by listing the categories of recorded data an agent can expect, though with an output schema present some of that enumeration is redundant.

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, front-loaded with what is retrieved and followed by the use case. Nothing is padded and every clause carries 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?

With a full output schema, complete parameter documentation and read-only annotations, the description supplies what is needed to call the tool correctly. The only minor gap is the absence of explicit routing to sibling alternatives, which is a usage concern rather than a completeness one.

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% and the single screenId parameter is already documented as 'Screen id from searchScreens or getProduct, e.g. linear-signup'. The description adds no syntax or format meaning beyond the schema, so the baseline 3 applies.

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 precise verb+resource ('Get everything recorded about one screen') and enumerates the specific content returned — notes, source URL, image URLs/dimensions, observed actions, page sections. The singular scope ('one screen', keyed by screenId) cleanly separates it from plural siblings like search_screens and compare_screens.

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?

It gives clear context: 'Use this to understand a specific UI pattern in detail before building something similar.' That is a genuine when-to-use signal, but it names no alternative tool (e.g. search_screens for discovery, compare_screens for side-by-side) and no exclusion conditions, so an agent must still infer the routing.

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