set_session_context

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states that it sets session context but does not explain whether this overwrites existing credentials, whether it validates the credentials, how long the session lasts, or any side effects. This is a significant gap for a state-mutating tool.

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 a single concise sentence and front-loads the primary action, but it is under-specified. It earns its place but leaves out crucial operational details, so conciseness comes at the cost of clarity.

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?

This tool is a session setup operation with no output schema and no annotations. The description fails to explain when to call it, which parameters are needed, how it interacts with sibling tools like check_credentials_status, and what side effects occur. It is inadequate for an agent to invoke it correctly.

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 schema has zero description coverage for all three parameters (token, cookie, api_url), and the description does not explain their roles beyond loosely mentioning 'credentials' and 'site URL'. The agent cannot determine which parameter is required, how they relate, or valid formats from this description.

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 uses a specific verb ('Sets') and names the resource ('default site URL and credentials for the current session'). It clearly distinguishes this tool from siblings by indicating it establishes session-level context, which no other sibling tool does.

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 provides no guidance on when to use this tool versus alternatives, no prerequisites, and no mention of ordering relative to other calls. It only implies that it configures the session, leaving the agent to infer that it should be called before other authenticated operations.

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