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

The annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: results are untrusted page data (a prompt-injection warning), how cursor and resultOffset differ in effect, and that unsupported browsers fall back to DOM tools.

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?

Four short sentences, front-loaded with purpose, then trust warning, then parameter semantics. Little waste, though the closing sentence about unsupported browsers is telegraphic and its subject has to be inferred.

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 and four parameters, the description supplies the key behavioral facts an agent needs: trust level of results, the two pagination modes, and the fallback path. The main remaining gap is that the two required parameters are left entirely to an undocumented schema.

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 0%, so the description carries the burden and it only covers two of four parameters: cursor pages through all tools, resultOffset re-reads a chunk of the last result without re-executing. It says nothing about task_id or interaction_generation, which are required and therefore the most consequential for a correct call.

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 names a specific verb and resource: 'Discover native WebMCP tools on the owned page.' That distinguishes it from the sibling task_webmcp_call, which presumably invokes a discovered tool, though the description never names that sibling or explicitly states the discover-then-call relationship.

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?

There is no explicit when-to-use or when-not-to-use guidance relative to siblings such as task_webmcp_call or browser_list. The discover-before-call intent and the DOM-tools fallback are only implied, so the agent has to infer the routing rather than being told it.

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