navigate

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

Annotations already declare non-read-only, open-world, non-idempotent, non-destructive behavior, so the safety profile is covered. The description usefully adds that the same DNS/IP policy as open_url applies and names the returned artifacts (new diagnostics, final URL, main HTTP status), but it never states that navigation mutates in-page state or how failures surface.

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 sentences, zero filler, and the key scoping distinction and return contract are front-loaded. Nothing is wasted.

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?

No output schema exists, and the description does partially cover returns (diagnostics, final URL, status), which helps. However, for a 5-parameter mutation-capable tool with nested objects and 0% schema coverage, the missing parameter semantics and mutation/failure behavior leave clear gaps.

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?

Five parameters with 0% schema description coverage, including a nested 'wait_for' object and two enums, yet the description says nothing about url, session_id, timeout_ms, wait_until, or the wait_for selector/state semantics. With no schema descriptions, the description carries the full burden and fails to compensate.

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 ('navigate') and resource (an existing session to an HTTP(S) URL) and explicitly scopes it relative to the sibling 'open_url' via 'existing session' and the shared DNS/IP policy. An agent can distinguish it from open_url without opening either schema.

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 phrase 'existing session' implicitly tells the agent this is for sessions already open, contrasting with open_url, but there is no explicit statement of when to prefer this over open_url or what preconditions (e.g., a live session_id) must hold. Usage is implied rather than stated.

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