session_navigate

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

With no annotations, the description must disclose behavior independently. It mentions that navigation occurs in the current tab without opening a new page and specifies the session_start prerequisite, but it does not clarify side effects (e.g., page content replacement), return behavior, or potential errors. Some transparency exists but is incomplete.

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?

The description is extremely concise: two short sentences in Russian that immediately state the core functionality and a key prerequisite. No filler or redundant information is present, and critical information is front-loaded.

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?

Although an output schema exists, it is not shown, so the description must stand on its own. The description omits any mention of return values, waiting behavior, or error handling. For a navigation tool within a session, knowing whether it returns page content or just confirmation is essential. Thus, while the tool is simple, the description is not fully 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 0% – neither parameter (url, max_chars) is explained. The description only hints at the URL parameter implicitly through the tool's purpose, but max_chars is completely unspecified, leaving the agent to guess its meaning (likely character limit for response). This fails to compensate for the low schema coverage.

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 clearly states the tool's purpose: navigating to a URL in the current tab of an existing session, explicitly noting that it does not open a new page. This differentiates it from browser_navigate and aligns with session_* siblings.

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 only usage guidance is the prerequisite 'Requires session_start,' which is useful but does not provide explicit comparison with alternative tools like browser_navigate or explain when to prefer this over other navigation methods. No conditions or exclusions are given.

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