get_account_overview

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

Without annotations, the description carries the burden of behavioral disclosure. It states authentication is required ('Requires login credentials'), which is useful. However, it doesn't disclose side effects, read-only nature, external login redirect behavior, session handling, or errors with bad credentials.

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 a single sentence plus a short auth note, which is efficient and front-loads the main purpose. It earns its place without redundancy.

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 read-oriented overview tool with 2 simple params and no output schema, the description is reasonably adequate. Missing details: whether usage summary is current-month, whether return values include recent charges, and what happens if credentials are missing. Could be more complete given the auth-sensitive nature.

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 schema already describes both parameters well with 100% coverage. The description adds the requirement that they are login-related but doesn't clarify precedence if both username and env var are set, or format expectations beyond the schema.

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 identifies the tool as retrieving a T-Mobile account overview with plan, balance, and usage summary. The verb 'Get' plus the resource 'T-Mobile account overview' gives a specific purpose, though it doesn't explicitly distinguish it from get_usage_details, which could theoretically overlap.

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 this is the account-level overview tool, and sibling tools like get_bill_history or get_usage_details exist for more specific data. However, there's no explicit 'when to use this vs. alternatives' guidance or exclusions stated.

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