Execute previewed Jev navigation

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

Annotations already mark this as non-read-only, non-idempotent, and non-destructive. The description adds meaningful behavioral context beyond those flags: the token is consumed, navigation is same-origin and fresh, and the server cannot independently verify human approval. This is genuinely useful and does not contradict the annotations.

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 tightly worded sentences front-load the core behavior and then provide the critical human-approval caveat. Every sentence earns its place with no redundancy or filler.

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 single-parameter mutation tool with rich annotations, the description covers the action, the preview-token prerequisite, and the human-approval responsibility. No output schema is expected, and nothing essential for calling the tool correctly is missing.

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 only parameter, token, is already fully documented in the schema with a pattern, required flag, and description. The tool description merely refers to it as a preview token and adds no new semantic detail, so the baseline of 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 names a specific action: 'consume one preview token and perform exactly its fresh, same-origin navigation.' It clearly identifies the resource and distinguishes this tool from the preview and cancel siblings by framing it as the execution step after preview.

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 provides clear usage context: a trusted MCP client must show source, label, and destination and obtain explicit human approval before calling execute. It does not explicitly name the alternative tools, but the preview-token prerequisite makes the intended workflow clear enough for an agent.

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