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

With no annotations, the description carries the full burden and does well: it discloses that no Token header is required here, that the token is auto-reused for the session, and that the password is never logged. It omits error/rate-limit behavior and token expiry, keeping it short of 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?

A single dense sentence leads with the endpoint and flows into return and session-reuse behavior. It is front-loaded and waste-free, though the em-dash packing makes it slightly harder to scan than a two-sentence split would be.

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 2-param auth tool with no output schema, the description covers the endpoint, credentials, what is returned (the API token), how the token is subsequently used, and the no-log guarantee. Nothing an agent needs to call it correctly is missing.

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 coverage is 100%, so the schema already documents both parameters. The description only restates 'email/password' and adds the 'never logged' note, which is already echoed in the password field description. Baseline 3 for schema-driven parameter docs.

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?

Names a specific operation (login) plus the exact endpoint (POST https://api.dmca.com/login) and the credential mechanism (email/password, no Token header). It is trivially distinguishable from the case-management siblings, which all revolve around cases rather than authentication.

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?

Explains the operating context clearly: the returned token is reused automatically for the rest of the MCP session, or can be passed explicitly. That tells an agent it normally needs to authenticate once up front, though it does not spell out ordering/prerequisites with case tools or what to do on auth failure.

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