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

With no annotations, the description carries the full behavioral burden. It does disclose the return payload (access_token) and a security behavior (do not repeat the password), which is genuinely useful. It does not cover failure modes, token validity/expiry, or credential requirements, so it is only partially complete.

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 short sentences, each carrying distinct value (action, return value handoff, security constraint), with the core action front-loaded. No filler.

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 two-parameter auth tool with no output schema and no annotations, the description covers the essentials: what it authenticates, what it returns, and how to use the result. Missing only error/expiry behavior, which is a minor gap.

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?

Schema description coverage is 0%, so the description must compensate; it names both parameters and adds the meaningful constraint that the password is secret and must not be repeated. It still omits email format expectations (e.g. valid-email validation) and any credential policy details.

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?

States a specific verb (log in) and resource (Changing Our Futures / MakeChoice) with the required credentials. It is immediately distinguishable from siblings like list_donors or start_donation, and names score_personality_test as the downstream consumer.

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?

Provides clear sequencing context: use this to obtain a token, then pass it to score_personality_test. There is no explicit statement of when-not to use it or what to do on failure, but the intended workflow is unambiguous.

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