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

The annotations only declare the mutation profile (readOnlyHint=false, idempotentHint=false, destructiveHint=false). The description adds real behavioral context beyond that: the duplicate-show failure, tier-gated voice availability, the English-only constraint for free accounts, and the reassurance that 'This does not change the subscription'. It stops short of describing the returned object or any error payload shape.

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?

Short declarative sentences, front-loaded with the core action and the duplicate-failure rule, then tier constraints. There is mild duplication of the language/voice tier rules that also live in the schema, which costs it the top mark but the text is otherwise dense and waste-free.

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 6-parameter create tool with no output schema, the description covers failure modes, defaults, and tier gating well. However, it says nothing about what a successful call returns (show id, defaulted fields) or how invalid handles are handled, which is the remaining gap an agent would hit on first invocation.

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 100%, so every parameter is already documented in the schema — including the English default, the free-tier language restriction, and the Nora-free/others-Pro voice rule. The description restates those same facts rather than adding new semantics (e.g. handle validation rules or how delivery_hhmm interacts with timezone), so the baseline 3 applies.

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 gives a specific verb and resource ('Create this account's daily podcast show') plus the failure condition 'Fails if a show already exists', which implicitly separates it from update_show/get_show. It never names a sibling explicitly, so it lands at clear-but-not-differentiating rather than a full 5.

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 establishes clear preconditions for use: the account must not already have a show, and the chosen voice must match the account tier ('Leo, Kristine, Ken, and Marko need Pro'). What is missing is explicit routing — it never says to call update_show when a show exists, leaving the agent to infer that from the failure note.

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