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

Goes well beyond the annotations (readOnly=false, destructive=true, idempotent=false) by disclosing that the call is UNAUTHENTICATED, that the code expires in 15 minutes, that only 5 attempts are allowed, that the api_key is revealed exactly ONCE, and that invalid/expired/consumed codes return a uniform error. This is rich, operationally critical context the annotations cannot convey.

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?

Front-loads the core action and the reveal-once key, then layers auth state, validation constraints, the security warning, and the continuation workflow. Sentences are dense but none are redundant or restate the schema, so every line earns its place.

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?

With an output schema present, return-value documentation is unnecessary, and the description covers the remaining gaps: auth status, expiry/attempt limits, security handling of the key, error behavior, and the next step in the flow. Nothing an agent needs to invoke this correctly is missing.

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 carries the full burden. It specifies that `code` is a 6-digit emailed code and that `email` + `code` must match a code issued by signup(email) within 15 minutes, which meaningfully constrains both parameters. Minor gap: no explicit format expectations for the email string (e.g., verified-address requirements), so a small amount of semantics is left implicit.

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 (Redeem) and resource (emailed 6-digit code) and names the exact output produced (reveal-once workspace API key). It distinguishes itself from sibling signup (which issues the code) and get_onboarding_status (which continues setup) without the agent needing to open any schema.

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?

Gives explicit prerequisites (email + code must match a code issued by signup(email) within the last 15 minutes, 5 attempts max), names the follow-up call get_onboarding_status() to continue setup, and tells the agent how to get a fresh code when one is invalid/expired/consumed. When-to-use and alternatives are fully covered.

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