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

Annotations only declare destructiveHint=true, so the description carries the meaningful remainder: the operation mutates accounting books, deletion is irreversible ('gone from the books'), and it must not be blindly retried. It also discloses the underlying endpoint, which helps an agent reason about failure modes.

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 WRITE warning is correctly front-loaded, followed by the resource scope, irreversibility, and prerequisite in descending order of importance. The trailing endpoint 'POST /journal/delete.json' is the only clause that does not clearly earn its place against everything else packed in.

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 destructive, no-output-schema mutation tool, it covers irreversibility, retry behavior, id sourcing, and the manual-entry restriction. It stops short of naming required permissions/authentication and does not describe the success/failure response shape, which would matter given there is no output schema.

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% and the schema itself documents the 1-20 id range plus the cashctrl_list_journal source for ids, so the description's 'by id' adds little. The one extra instruction, confirming ids with the user, is behavioral rather than a semantics clarification, so the baseline 3 is correct.

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 names a specific verb and resource ('DELETES manual journal entries by id') and immediately scopes it against a sibling category, noting that entries created by orders or salary statements cannot be deleted this way. An agent can distinguish this from cashctrl_delete_orders and the create/get journal tools without opening the schema.

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 states explicit prerequisites ('confirm the ids with the user first'), the retry policy ('one request that is never repeated; check the result before trying again'), and a hard exclusion (order- and salary-generated entries are not deletable here). That is when-to-use, when-not-to-use, and operational guidance in one place.

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