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

Beyond annotations, the description explains that this is a two-phase flow, that the first call returns a URL and code, that re-calling checks approval status, and that the key is stored locally once approved. It also discloses that it has no effect when env/flag auth exists and that the hosted endpoint auto-triggers OAuth, giving a very complete behavioral picture.

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?

Although the description is long, it is necessary for a non-trivial two-phase flow. It is well-structured with a summary, trigger conditions, numbered phases, and explicit exclusions. Every sentence carries operational information, and the key trigger condition is front-loaded.

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 multi-phase tool with no output schema, the description covers the full flow: what happens on first call, what the agent should tell the user, what happens on subsequent calls, and when the tool is not applicable. An agent has enough information to call it correctly and to guide the user through approval.

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 tool has zero parameters, so the input schema leaves nothing to document; the baseline for no parameters is 4. The description reinforces this by saying repeated calls use 'no arguments change,' which is helpful for agents deciding how to invoke the second phase.

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 states the specific action ('Sign in without pasting an API key') and the mechanism (browser-based human approval, then local key storage). It is clearly distinct from siblings like logout and the rest of the toolset, and even references a comparable flow (snyk_auth) to anchor meaning.

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 explicitly says when to call this tool: 'whenever a tool reports “Not signed in” or that the stored key was revoked or expired.' It also gives exclusions: if an API key flag or environment variable is present, and if running on the shared hosted endpoint, the tool should not run the flow.

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