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

Annotations already indicate this is a mutating, non-idempotent operation. The description adds useful behavioral context: credentials are stored securely, the operation maps to a specific OpenAPI endpoint, and standard API/billing/rate limits apply. It does not contradict the annotations.

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 compact and front-loaded with the core purpose. The redundant opening line 'Upload Google credentials' and the first sentence say nearly the same thing, but the rest of the content is purposeful and concise, adding endpoint and scope information without unnecessary padding.

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 moderate-complexity upload tool with no output schema, the description provides enough context for an agent to select and invoke it: the action, required inputs, scope, endpoint, and operational constraints. Minor gaps like duplicate-credential behavior or error cases are not covered, but the description is largely complete.

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 covers 100% of the parameters, so the baseline is 3. The description names the two required parameters but does not add additional semantic detail beyond what the schema already provides. This is acceptable because the schema descriptions are sufficient.

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 the specific action: uploading Google service account credentials for Google Wallet pass signing. It identifies the exact resource type and distinguishes this from sibling tools like listGoogleCredentials, deactivateGoogleCredential, and the certificate upload 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?

The description implies the intended use case through the purpose statement and scope, but it does not explicitly state when to choose this over alternatives or when not to use it. No sibling tool is named as an alternative, leaving the agent to infer the selection from context.

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