firefox_navigate

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

Annotations already declare readOnlyHint=false, destructiveHint=true, openWorldHint=true, and idempotentHint=false, so the safety profile is known. The description adds almost nothing beyond that: it never says the current page content and its in-page state are replaced, what "authorized" requires (presumably firefox_request_access), or what happens on a blocked or failed navigation.

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?

It is a single front-loaded sentence with no filler clauses, which is structurally clean. However, the brevity is achieved by removing substance rather than by compressing it, so the terseness works against the definition instead of for it.

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?

There is no output schema, and the tool is a destructive, open-world mutation acting on browser state, which raises the completeness bar. With only two parameters and a clear schema the core call is inferable, but the authorization model and the effect on existing page state remain undocumented.

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 50%: url is documented in the schema (HTTP/HTTPS, 1-2000 chars) while tabId has no description at all. The description does not compensate, offering only the circular claim that the tab must be "authorized" rather than explaining that tabId must come from firefox_list_tabs/open_tab and that the URL scheme is restricted.

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 verb ("Navigate") and an implicit resource (a tab, via "tabId"), but replaces the actual destination concept with the vague word "destination" and adds "authorized" twice without defining it. It gives no basis for distinguishing this from siblings like firefox_open_tab or firefox_tab_history, which also move a tab to a page.

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 when-to-use guidance, no mention of prerequisites for the "authorized" state, and no alternative named (open_tab for a new tab, tab_action or tab_history for other tab changes). The agent is left to infer the routing decision entirely from the tool name.

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