Read page observations

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

The description goes far beyond the readOnly/idempotent annotations by detailing privacy and completeness limitations: credentials and fragments are removed, headers/cookies/bodies/storage/WebSockets/service workers/data URLs are never captured, console stacks are omitted, text is best-effort redacted, and sinceEventId use is explicitly non-destructive. It also warns that results may be incomplete and to inspect gap and droppedCount.

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 front-loaded with the core purpose and packs substantial behavioral detail into a compact paragraph without filler or redundant schema repetition. It is dense and somewhat long, but the complexity of the tool justifies the length.

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?

Given the tool's complexity, 7 parameters, and output schema, the description is very complete. It documents source semantics, text retrieval behavior, exclusions, redaction, checkpoint usage, and completion caveats. The rendered output schema covers the remaining response structure, so the description does not need to explain return values itself.

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?

Although the schema has 0% description coverage, the tool description compensates strongly for the most important parameters: 'source' receives detailed enum semantics, 'includeText' is explained with its restrictions, 'sinceEventId' is described as a non-destructive checkpoint, and sessionId/pageId map to 'one explicitly addressed page.' Less direct attention is given to limit, timeoutMs, and their defaults, so it stops short of a full score.

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 begins with a specific verb and resource: 'Read bounded observations recorded for one explicitly addressed page.' It then distinguishes the four source types, making it clear the tool is for observing console, page-error, network, and request-failed events, which separates it from the snapshot/visible-text/state siblings.

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 gives explicit guidance on when to use each source, notably distinguishing network responses from requestFailed events and explaining when includeText is meaningful. It does not explicitly mention alternatives among the sibling tools, but it provides strong within-tool selection guidance and advises inspecting gap and droppedCount before treating evidence as complete.

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