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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, openWorld), so the bar is lower; the description still adds useful behavior, namely that results are buffered from page load and include status codes. It doesn't state retention limits, pagination, or whether entries accumulate across navigations, which is the remaining gap.

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?

Three tight sentences; the scope and pageId requirement come first, then the filter hint, then the negative case with alternatives. Zero filler and appropriately sized for a 3-param read tool.

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 no output schema, the description supplies the key return semantics (requests with status codes, accumulated since page load) and the scoping prerequisite (pageId). It stops short of describing result shape or volume limits, a minor gap for a tool whose annotations already confirm a safe read.

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%, so filter, pageId, and failedOnly are already documented in the schema (substring match, page ID from web_navigate, status >= 400). The description only re-frames `filter` as narrowing to an API path, adding marginal value beyond the structured fields; 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?

States a specific verb+resource (network requests by pageId), the scope (since the DESKTOP grid browser page opened, buffered from load), and the payload detail (status codes). It explicitly distinguishes itself from device-level captures, so an agent can separate it from session_network_logs or the android/ios capture 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?

Gives explicit when-to-use (page made by the desktop grid browser, scoped by pageId), a narrowing hint ('Use `filter` to narrow to an API path'), and a clear when-NOT-to-use with named alternatives (android_devtools_capture_network / ios_safari_capture_network by udid). Nothing is left to inference.

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