browser_navigate

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

With no annotations, the description carries the full burden. It usefully discloses a real behavioral invariant (pre-navigation element numbers become void), which is valuable context for the snapshot/click workflow, but it omits whether the call blocks until load, what happens on navigation failure, or whether it errors versus returning a status.

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?

Two short sentences, front-loaded with the action and followed immediately by the one non-obvious consequence. Nothing is redundant or padded.

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 5-parameter navigation tool with no annotations and no output schema, the description covers purpose and the stale-element caveat but leaves the caller unsure about blocking semantics, failure modes, and what state the tab is left in. It is adequate, not complete.

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 100%, so url, tabId, windowId, timeoutMs and waitUntil are already documented in the schema. The description adds no syntax, default, or interplay information beyond that, which is the expected baseline when the schema does the work.

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 and resource ("Open a URL in a tab"), which is enough to identify it as a navigation tool. It does not distinguish itself from sibling browser_new_tab or browser_reload, which are the nearest alternatives, so an agent must infer the difference.

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, and no mention of when to prefer browser_new_tab or browser_reload instead. The phrase "in a tab" faintly implies reusing an existing tab, but this is never stated as a rule.

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