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

No annotations are provided, so the description carries the behavioral burden. It discloses the implicit input (.env credentials), the authentication action, and the persistent side effect of storing a session. It does not cover failure modes (missing credentials, expired session) or whether re-calling refreshes the session, which keeps it from a 5.

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?

Front-loaded with the core action, followed by the prerequisite and a short numbered sequence of side effects. Every line earns its place with no filler.

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 zero-parameter, no-annotation, authenticated-setup tool with an output schema, the description covers what the tool does, when it is required, and its side effects. It is complete enough to invoke, though error and expiry behavior would make it fully self-contained.

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?

Zero parameters gives a baseline of 4. The description adds useful context that the 'missing' credentials come from a .env file, clarifying an implicit input the schema cannot express.

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 (authenticate) and resource (Cookidoo), plus the side effect of storing the session. The prerequisite line distinguishes it from every sibling tool, all of which are read or plan operations on an already-authenticated session.

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?

Explicitly says 'This tool must be called before using other Cookidoo tools,' which is exactly the routing condition an agent needs. No ambiguity about ordering versus the siblings.

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