mcp_login

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

No annotations are present, so the description carries full burden. It discloses manual browser interaction, test account restrictions, and env var support. It does not detail idempotency or side effects, but for a login tool this is reasonable.

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 front-loaded with the action and uses three sentences. Some redundancy exists (e.g., repeating 'REAL' for both fields), but overall efficient.

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?

No output schema exists, but the description does not mention what the tool returns (e.g., a link or status). It implies a link is provided but is not explicit, leaving agents guessing about the next step.

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%, but the description adds crucial meaning: 'REAL' credentials, 'not a test account', and env var fallback. This goes beyond the schema's basic descriptions.

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 'Initiate MCP authentication flow' with a specific verb and resource. It distinguishes mcp_login from sibling tools like mcp_authenticate and mcp_logout by focusing on starting the authentication process.

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 clear context: requires real JauMemory credentials, manual browser approval, and env var fallback. However, it does not explicitly contrast with mcp_authenticate or state when not to use this tool.

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