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

The annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful domain context about what an account represents and the ID lookup requirements, but it does not describe pagination, return shape, or whether both IDs may be supplied.

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?

Four compact sentences are front-loaded with the action, followed by the key constraint, the domain definition, and the ID lookup guidance. There is no redundant or wasted wording.

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 read-only listing tool with full schema description coverage and annotations covering safety, the description supplies enough context to invoke it correctly. Minor gaps remain around pagination or whether both parameters can be combined, but nothing critical 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 coverage is 100%, but the description adds important semantics beyond the schema: it states that at least one of user_id or institution_id is required, whereas the schema marks neither as required. It also explains how to obtain valid IDs, adding real value over the schema field descriptions.

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 uses a specific verb and resource ('Lists accounts') and clarifies that accounts are containers for transaction accounts and scenarios, which helps distinguish them from sibling concepts such as list_transaction_accounts. It does not explicitly route the agent to other account-related siblings like get_account or list_transaction_accounts, so it falls short of full sibling differentiation.

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 clearly states the key usage constraint that either user_id or institution_id is required, and it names get_current_user and list_institutions as sources for those IDs. It lacks an explicit when-to-use-this-vs-alternatives statement for other account-listing tools, but the prerequisite guidance is strong.

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