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

The description goes well beyond the readOnly/idempotent annotations by explicitly stating that the tool sends nothing to the network and merely returns instructions. It also discloses an important security detail: client_secret is a password that will be stored on disk and is needed for token renewal.

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?

Three dense sentences with no filler: the first states purpose and constraints, the second describes the return value and next action, and the third conveys necessary security guidance. The most important scoping information 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 zero-parameter tool whose safety profile is already covered by annotations, the description is complete. It tells the agent what the tool returns, how to use the result, what to warn the user about, and which sibling tool to call next.

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 is empty, so the baseline is 4. The description adds relevant context about the client_id/client_secret pair even though they are not parameters of this tool, clarifying what the returned instructions will cover.

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 that start_login is the first step of connecting VK Ads and that it returns instructions rather than performing a network action. It names the exact next step (passing the credentials to finish_login), which distinguishes it from the sibling tools.

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?

It explicitly frames itself as the first step and instructs the agent to pass the obtained client_id/client_secret pair to finish_login. It does not exhaustively state when not to use it, but the positioning relative to finish_login gives clear usage context.

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