session_status

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

Annotations already declare readOnlyHint=true. The description adds value by stating that token values are not exposed and explains the two data sources (OAuth context vs. session store) depending on mode. This provides behavioral context beyond 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?

The description is two succinct sentences. The first states core purpose, the second adds mode-specific behavior. It is front-loaded, free of fluff, and every sentence adds value.

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?

Given 0 parameters, the description covers essential aspects: what it returns, what it does not expose, and how it determines status. With an output schema present, return value details are not needed. The tool is simple and description is 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?

The input schema has 0 parameters, so baseline is 4 per guidelines. The description adds no parameter information, but none is needed. Schema coverage is 100% (no params), so the description is adequate.

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 explicitly states the tool returns authentication status (login status, token_user_id, selected account) and that it does not expose token values. This clearly defines verb and resource, distinguishing it from sibling tools like login, logout, and get_token_info.

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 explains when to use the tool (to check authentication status) and provides context on how it derives status based on OAuth or session store mode. While it does not explicitly state when not to use, the guidance is clear and context-aware.

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