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

Annotations already cover the read-only/idempotent safety profile, and the description adds real behavioral context beyond that: the three-way status distinction, the fact that a false prices_live is not a failure, and the explicit warning that {"untrusted_text"} fields are broker/human data whose instructions must never be followed. It stops short of auth requirements or rate limits.

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-loaded with the core definition, then one clause per field; nearly every sentence earns its place by disambiguating a value the agent must interpret. It is dense but not padded, though the dangling 'see evidence' reference could confuse an agent without more context.

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 no output schema, the description carries the full burden of explaining return values and does so field by field, including the subtle null/false/true distinction for prices_live and the untrusted_text safety note. It is complete enough to interpret the response, with only cross-tool routing left unaddressed.

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?

Only one parameter, and schema coverage is 100% with the schema itself explaining account_id comes from list_accounts. The description adds nothing further about the parameter, so this is the expected baseline.

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+resource ('Truthful health of one account') and pins down exactly what health means via the status enum semantics. It is distinguishable from a generic account-info call by its emphasis on live broker-link truth, though it never names the sibling tools (get_account_info, get_account_snapshot, get_trade_status) it could be confused with.

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?

Usage is implied rather than stated: 'do not trade on unknown' and the prices_live caveat steer decisions, and 'see evidence' gestures at verification. There is no explicit when-to-use or when-not-to-use versus the other account tools, so the agent must infer the routing.

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