login

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

With no annotations provided, the description discloses that the tool returns a URL that must be opened in a browser and that authentication must be completed via a separate call. It also states the return format as a dictionary with URL and instructions. This is transparent about the tool's role and limitations, though it omits details like error handling or token expiration.

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 three short, clearly separated sentences/paragraphs. It front-loads the purpose, then gives flow details and return info. Every sentence is useful; no redundancy or fluff.

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 simple zero-parameter tool with no annotations, the description covers the essential workflow, return value, and the required next step. The presence of an output schema is noted, and the description's mention of the dictionary return is sufficient. The only minor gap is the content of 'instructions,' but this is not critical for invocation.

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 no parameters, so the description has nothing to add. Per the baseline for zero-parameter tools, this earns a 4. The description correctly avoids inventing parameter documentation.

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 first sentence clearly states the tool 'Start DBOS Cloud login flow,' using a specific verb and resource. It distinguishes from the sibling tool login_complete by explicitly mentioning the follow-up step. The description also specifies the return value, making the purpose unambiguous.

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 implies usage by explaining the two-step process: call this tool to get a URL, then call login_complete after authenticating. This provides clear context for when this tool is needed and its relationship to the sibling login_complete, though it does not explicitly list exclusions.

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