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

Annotations already declare readOnlyHint, openWorldHint=false and destructiveHint=false, so safety is covered. The description adds real behavioral context beyond that: no transaction data is included, results carry an as-at currency date, and it explains the nickname-vs-bank-name distinction the agent should apply when speaking to the user.

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 opening sentence is well front-loaded, but the final sentence is a dense, tangled clause chain ('is what to call it; name is the bank's and stays available for saying which account is meant') that takes effort to parse and partially restates output-schema territory.

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 zero-parameter read-only tool with annotations covering safety and an output schema covering returns, the description supplies everything else an agent needs: scope (all linked accounts), exclusions (no transactions), data freshness (as-at date), and field-naming guidance.

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 tool takes zero parameters, so the baseline is 4. The description goes slightly further by disambiguating the semantics of returned account fields (nickname vs bank name), which is useful even though no input exists to document.

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?

Names a specific resource (every linked account) and the exact fields returned (names, types, current balances). 'Contains no transactions' implicitly separates it from list_transactions and get_transaction, though no sibling is named explicitly.

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?

There is no explicit when-to-use vs alternative; the only routing signal is the negative 'Contains no transactions', which implies the transaction tools are for that need. Nothing tells the agent when to prefer balance_sheet or chart_of_accounts over this.

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