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

Annotations already declare destructiveHint=true, readOnlyHint=false, and idempotentHint=false, so the safety profile is covered. The description adds genuinely new behavior beyond that: the 30-day restorability window and the restore tool to use. It does not mention permission requirements or side effects on related records (e.g., balances or budgets).

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 purpose and restore-window sentences are front-loaded and earn their place. The trailing amount/date/period formatting rules are boilerplate irrelevant to a single-id delete call and dilute the definition.

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 one-parameter destructive delete with no output schema and full annotation coverage, the reversibility disclosure is the key missing piece and it is present. Still absent: any description of the id's expected format, and whether deleting cascades to related data.

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% and the single parameter (id) is undocumented in both schema and description. Worse, the description spends its parameter-level text on amount-in-minor-units and date-format conventions that do not correspond to any parameter this tool accepts, so it adds no usable meaning for id.

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 and resource ("Delete an entry") that matches the tool name delete_transaction, so an agent knows exactly what operation runs. It does not contrast itself with the other write siblings (bulk_update_transactions, update_transaction), but the intent is unambiguous.

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 clear operational context by naming the recovery alternative (restore_transactions) and its 30-day window, which tells the agent this is recoverable rather than permanent. It stops short of stating exclusions or when a bulk/alternative delete path should be preferred.

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